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MASTERTEMP®125
HIGH PERFORMANCE HEATER
INSTALLATION AND USER’S GUIDE
FOR YOUR SAFETY - READ BEFORE OPERATING
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FOR YOUR SAFETY - This product must be installed and serviced by authorized personnel, qualiﬁed inpool/spa
heater installation. Improper installation and/or operation can create carbon monoxide gas and ﬂue gases which can
cause serious injury, property damage, or death. For indoor installations, as an additional measure of safety, Pentair
Aquatic Systems strongly recommends installation of suitable Carbon Monoxide detectors in the vicinity of this
appliance and in any adjacent occupied spaces. Improper installation and/or operation will void the warranty.
120/240 VAC NATURAL GAS/LP GAS
Models
Natural
Propane
125K BTU/HR (without cord)
125K BTU/HR (with cord)
461058
461059
461060
461061
OWNER:
Retain For
Future
Reference
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WHAT TO DO IF YOU SMELL GAS
FOR
YOUR
SAFETY

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Pentair Water Pool and Spa, Inc.
1620 Hawkins Ave., Sanford, NC 27330 ɒ (800) 831-7133 or (919) 566-8000
10951 W. Los Angeles Ave., Moorpark, CA 93021 ɒ (800) 831-7133 or (805) 553-5000
3
Contents
6HFWLRQ+HDWHU,GHQWL¿FDWLRQ,QIRUPDWLRQ.........................................................................
6HFWLRQ:DUQLQJDQG6DIHW\,QIRUPDWLRQ..........................................................................
4
5
Important Notices .................................................................................................................................................................................
Warranty Information ............................................................................................................................................................................
Code Requirements..............................................................................................................................................................................
Consumer Information and Safety Information .....................................................................................................................................
General Speciﬁcations..........................................................................................................................................................................
5
5
6
6-9
9
Section 3. Installation ..............................................................................................................
10
Heater Description ................................................................................................................................................................................
10
Putting the Heater into Service .............................................................................................................................................................
10
Speciﬁcations .......................................................................................................................................................................................
11
Plumbing Connections..........................................................................................................................................................................
12
Valves ...................................................................................................................................................................................................
12
Manual By-Pass ...................................................................................................................................................................................
12
Water Connections ...............................................................................................................................................................................
13
Below Pool Installation .........................................................................................................................................................................
13
Gas Connections ..................................................................................................................................................................................
14
Sediment Traps ...................................................................................................................................................................................
14
Gas Pipe Sizing ....................................................................................................................................................................................
15
Testing Gas Pressure/Gas Pressure Requirements .............................................................................................................................
15
Outdoor Installation (US and Canada) / Heater Clearances ................................................................................................................
16
Outdoor Installation Venting Guidelines ..............................................................................................................................................
17
Indoor Venting — General Requirements (Category I and Category III requirements) ......................................................................
17
Heater Clearances — General Requirements (Indoor Installation for US or Outdoor Shelter for Canada) .......................................
18
Outside Vent Cover Removal ...............................................................................................................................................................
18
Combustion Air Supply .........................................................................................................................................................................
18
Direct Air Intake Exhaust Duct using 3-inch PVC Pipe (Indoor Installation) / Corrosive Vapors and Possible Causes ........................
19
Vent Installation (Indoor Installation for U.S. or Outdoor Shelter for Canada) ......................................................................................
20
Vertical Venting - Negative Pressure ................................................................................................................................................... 20 - 22
Horizontal or Vertical Venting - Positive Pressure ...............................................................................................................................
23
Connecting Special Gas Venting .......................................................................................................................................................... 23 - 25
Outdoor Shelter Vent Installation ..........................................................................................................................................................
26
Garage or Utility Room Installation .......................................................................................................................................................
26
Control Panel Indexing .........................................................................................................................................................................
27
Final Installation Check ........................................................................................................................................................................
27
Electrical Connections ..........................................................................................................................................................................
28
Fireman’s Switch Connection/Remote Control Connections ................................................................................................................
29
MasterTemp® 125 Heater Wiring Diagram ...........................................................................................................................................
30
Electrical Schematic Ladder Diagram ..................................................................................................................................................
31
Section 4. Operation ................................................................................................................
32
Basic System Operation .......................................................................................................................................................................
32
HSI (Hot-Surface Ignition) Lighting/Operation ......................................................................................................................................
32
Operating .............................................................................................................................................................................................
33
To Turn Off Gas to Appliance ................................................................................................................................................................
33
Safety Controls ..................................................................................................................................................................................... 34 - 36
Section 5. Troubleshooting ....................................................................................................
37
Initial Troubleshooting and Troubleshooting Chart ...............................................................................................................................
38
Heater Will Not Fire Troubleshooting .................................................................................................................................................... 39 - 42
LED Diagnostics ................................................................................................................................................................................... 43 - 44
Burner / Heat Exchanger Troubleshooting ...........................................................................................................................................
45
Section 6. Maintenance ...........................................................................................................
45
Care and Maintenance .........................................................................................................................................................................
46
Pressure Relief Valve ...........................................................................................................................................................................
45
After Start-Up........................................................................................................................................................................................
46
Spring, Fall and Winter Operation ........................................................................................................................................................
46
Maintaining Pool Temperature ..............................................................................................................................................................
47
Energy Saving Tips...............................................................................................................................................................................
48
Chemical Balance................................................................................................................................................................................. 47 - 48
Replacement Parts ............................................................................................................................................................................... 49 - 53
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
4
Section 1. Heater Identiﬁcation Information
Section 1: Heater Identiﬁcation Information
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Construction STD 6WDQGDUG0RGHO
HEATER IDENTIFICATION INFORMATION — (HIN)
H. I. N.
HEATER IDENTIFICATION NUMBER
ID DESIGNATOR FOR PENTAIR AQUATIC SYSTEMS MASTERTEMP® 125 HEATER
Example:
1
2
3
4
MT
125
NA
STD
CONSTRUCTION = STD = STANDARD MODEL
FUEL TYPE =
NA = NATURAL GAS
LP = PROPANE GAS
MODEL SIZE = BTU INPUT in 1000 of BTU / HR
MT = MASTERTEMP
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 2.
Warning and Safety Instructions 5
Section 2: Warning and Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS
READ AND FOLLOW ALL INSTRUCTIONS
SAVE THESE INSTRUCTIONS
MasterTemp® 125 High Performance Heater
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IMPORTANT NOTICES
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WARRANTY INFORMATION
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CAUTION
OPERATING THIS HEATER CONTINUOUSLY AT WATER TEMPERATURE BELOW 68° F. WILL CAUSE HARMFUL
CONDENSATION AND WILL DAMAGE THE HEATER AND VOID THE WARRANTY. Do not use the heater to protect pools
or spas from freezing if the ﬁnal maintenance temperature desired is below 68° F., as this will cause condensation
related problems.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
6
Section 2.
Warning and Safety Instructions
CODE REQUIREMENTS
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DANGER
CARBON MONOXIDE GAS IS DEADLY – Exhaust from this pool heater contains toxic levels of carbon monoxide, a dangerous,
poisonous gas you cannot see or smell.
CONSUMER INFORMATION AND SAFETY
WARNING
The U.S. Consumer Product Safety Commission warns that elevated water temperature can be hazardous.
See below for water temperature guidelines before setting temperature.
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WARNING
Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the heater.
Do not use this heater if any part has been under water. Immediately call a qualiﬁed service technician to
inspect the heater and to replace any part of control system and gas control which has been under water.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 2.
Warning and Safety Instructions 7
SAFETY INFORMATION
The MasterTemp® 125 Heater is designed and manufactured to provide many years of safe and reliable service when installed,
operated and maintained according to the information in this manual. Throughout this manual, safety warnings and cautions
are identiﬁed by the “ “ symbol. Be sure to read and comply with all of the warnings and cautions.
DANGER — CARBON MONOXIDE GAS IS DEADLY
READ OWNERS MANUAL COMPLETELY BEFORE OPERATING
THIS PRODUCT MUST BE INSTALLED AND SERVICED BY A PROFESSIONAL SERVICE
TECHNICIAN, QUALIFIED IN POOL HEATER INSTALLATION. Some jurisdictions require that
installers be licensed. Check with your local building authority about contractor licensing requirements.
Improper installation and/or operation could create carbon monoxide gas and ﬂue gases which could
cause serious injury or death. Improper installation and/or operation will void the warranty.
Exhaust from this pool heater contains toxic levels of carbon monoxide, a dangerous, poisonous gas
you cannot see or smell. Symptoms of carbon monoxide exposure or poisoning include dizziness,
headache, nausea, weakness, sleepiness, muscular twitching, vomiting and inability to think clearly.
IF YOU EXPERIENCE ANY OF THE ABOVE SYMPTOMS, IMMEDIATELY TURN OFF THE POOL
HEATER, LEAVE THE VICINITY OF THE POOL OR SPA AND GET INTO FRESH AIR IMMEDIATELY.
THE POOL HEATER MUST BE THOROUGHLY TESTED BY A GAS PROFESSIONAL BEFORE
RESUMING OPERATION.
EXCESSIVE CARBON MONOXIDE EXPOSURE CAN CAUSE BRAIN DAMAGE OR DEATH.
sNEVER use this pool heater indoors without speciﬁed ventilation system (and properly installed
vent pipe).
sNEVER use this pool heater in the home or in partly enclosed areas (such as garages), unless
the speciﬁed ventilation system is used. If used outdoors, install far from open windows, doors,
vents and other openings.
s Pentair strongly recommends that all vents, pipes and exhaust systems be initially and
periodically tested for proper operation. This testing can be accomplished by using a hand-held
carbon monoxide meter and/or by consulting with a gas professional.
s Pool heaters must be used in conjunction with carbon monoxide detectors installed near the
pool heater. The carbon monoxide detectors must be periodically inspected for proper operation so
WARNING — FOR YOUR SAFETY
This product must be installed and serviced by a professional service technician, qualiﬁed in pool
heater installation. Some jurisdictions require that installers be licensed. Check with your local building
authority about contractor licensing requirements. Improper installation and/or operation could create
carbon monoxide gas and ﬂue gases which could cause serious injury or death. Improper installation
and/or operation will void the warranty.
WARNING — This heater is equipped with an unconventional gas control valve that is factory set with
a manifold pressure of -.2 inches wc. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury or loss of life. Installation or service must
be performed by a qualiﬁed installer, service agency or the gas supplier. If this control is replaced, it
must be replaced with an identical control.
Do not attempt to adjust the gas ﬂow by adjusting the regulator setting.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
8
Section 2.
Warning and Safety Instructions
SAFETY INFORMATION, (cont’d.)
WARNING — Risk of ﬁre or explosion from incorrect fuel use or faulty fuel conversion. Do not try to run a
heater set up for natural gas on propane gas or vice versa. Only qualiﬁed service technicians should
attempt to convert heater from one fuel to the other. Do not attempt to alter the rated input or type of
gas by changing the oriﬁce. If it is necessary to convert to a different type of gas, consult your Pentair
dealer. Serious malfunction of the burner can occur which may result in loss of life. Any additions,
changes, or conversions required in order for the appliance to satisfactorily meet the application needs
must be made by a Pentair dealer or other qualiﬁed agency using factory speciﬁed and approved
parts. The heater is available for use with natural gas or LP (propane) gas only. It is not designed to
operate with any other fuels. Refer to the nameplate for the type of gas the heater is equipped to use.
s 5SEHEATERONLYWITHTHEFUELFORWHICHITISDESIGNED
s )F A FUEL CONVERSION IS NECESSARY REFER THIS WORK TO A QUALIlED SERVICE TECHNICIAN OR GAS SUPPLIER before putting the heater into operation.
WARNING — Risk of ﬁre or explosion from ﬂammable vapors. Do not store gasoline, cleaning ﬂuids, varnishes,
paints, or other volatile ﬂammable liquids near heater or in the same room with heater.
WARNING — Risk of explosion if unit is installed near propane gas storage. Propane (LP) gas is heavier than
air. Consult local codes and ﬁre protection authorities about speciﬁc installation requirements and
restrictions. Locate the heater away from propane gas storage and ﬁlling equipment as speciﬁed by
the Standard for the Storage and Handling of Liqueﬁed Petroleum Gases, CAN/CSA B149.2 (latest
edition) or ANSI/NFPA 58 (latest edition).
WARNING — Risk of ﬁre, carbon monoxide poisoning, or asphyxiation if exhaust venting system leaks. Only
qualiﬁed service technicians should attempt to service the heater, as leakage of exhaust products or
ﬂammable gas may result from incorrect servicing.
WARNING — Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly
when installing heater. Do not use a draft hood with this heater, as the exhaust is under pressure
from the burner blower and a draft hood will allow exhaust fumes to blow into the room housing the
heater. The heater is supplied with an integral venting system for outdoor installation. A vent conversion
kit (See Page 23 for Part Numbers for Conversion Kits) is available for installations in enclosures
Canada) or indoors (U.S.). Use the speciﬁed venting, and only the speciﬁed venting, when heater is
installed in an enclosure or indoors. In Canada, this pool heater can only be installed outdoors or in
an enclosure that is not normally occupied and has no openings directly into occupied areas. See
Page 18 for enclosure venting requirements.
CAUTION — Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper
and dangerous operation. Wiring errors can also destroy the control board.
s #ONNECTHEATERTO120 or 240 Volt, 60 Hz., Single Phase power only.
s 6ERIFYPROPEROPERATIONAFTERSERVICING
s $ONOTALLOWCHILDRENTOPLAYONORAROUNDHEATERORASSOCIATEDEQUIPMENT
s .EVERALLOWCHILDRENTOUSETHEPOOLORSPAWITHOUTADULTSUPERVISION
s 2EAD AND FOLLOW OTHER SAFETY INFORMATION CONTAINED IN THIS MANUAL PRIOR TO OPERATING THIS POOL heater.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 2.
Warning and Safety Instructions 9
CONSUMER INFORMATION AND SAFETY
WARNING
The U.S. Consumer Product Safety Commission warns that carbon monoxide is an “invisible killer”. Carbon monoxide
is a colorless and odorless gas.
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GENERAL SPECIFICATIONS
NOTICE:
s #OMBUSTIONAIRCONTAMINATEDBYCORROSIVECHEMICALFUMESCANDAMAGETHEHEATERANDWILLVOIDTHEWARRANTY
s 4HE#OMBINATION'AS#ONTROL6ALVEONTHISHEATERDIFFERSFROMMOSTAPPLIANCEGASCONTROLS)FITMUSTBEREPLACED
for safety reasons replace it only with an identical gas control.
s 4HEACCESSDOORPANELSMUSTBEINPLACETOPROVIDEPROPERVENTILATION$ONOTOPERATETHEHEATERFORMORETHANlVE
minutes with the access door panels removed.
s 4HISHEATERISDESIGNCERTIlEDBY#3!)NTERNATIONALASCOMPLYINGWITHTHE3TANDARDFOR'AS&IRED0OOL(EATERS
ANSI Z21.56/CSA 4.7, and is intended for use in heating fresh water swimming pools or spas.
s 4HEHEATERISDESIGNEDFORTHEHEATINGOFCHLORINEBROMINEORSALTSYSTEMSWIMMINGPOOLSANDSPAS)TSHOULDNOT be
used as a space heating boiler, or general purpose water heater.
s 4HEHEATERISDESIGNCERTIlEDBY#3!)NTERNATIONALFORINSTALLATIONONCOMBUSTIBLEmOORING3PECIlEDMINIMUM
clearances must be maintained to combustible surfaces (see “Heater Clearances”, page 18).
s 4HEHEATERSHOULDBELOCATEDINANAREAWHERELEAKAGEOFTHEHEATERORCONNECTIONSWILLNOTRESULTINDAMAGETOTHE
area adjacent to the heater or to the structure. When such locations cannot be avoided, it is recommended that a
suitable drain pan, adequately drained, be installed under the heater. The pan must not restrict air ﬂow.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
10
Section 3.
Installation Instructions
Section 3: Installation Instructions
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Gas
HEATER DESCRIPTION
Air
Blower
Mixer
Inlet
(Cold
Water)
Outlet
(Mixed
Water)
Burner
Heating Coils
SEQUENCE OF OPERATION
Figure 1.
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PUTTING THE HEATER INTO SERVICE
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MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 11
SPECIFICATIONS
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W\SHRIKHDWLQJHTXLSPHQWDQGUHODWHGFRPSRQHQWV6RPHVWDWHVUHTXLUHLQVWDOODWLRQDQGUHSDLUE\OLFHQVHGSHUVRQQHO
,IWKLVDSSOLHVLQ\RXUVWDWHEHVXUH\RXUFRQWUDFWRUEHDUVWKHDSSURSULDWHOLFHQVH6HH)LJXUHIRU2XWGRRUDQG,QGRRU
,QVWDOODWLRQV
20.85"
52.95cm
DIMENSIONS IN INCHES
ELECTRICAL
CONDUIT PORT
29.43"
74.76
17.5"
44.5cm
21"
53 cm
10.87"
28.cm
FRONT VIEW
TOP VIEW
23"
58.4cm
10.87"
27.6cm
EXHAUST SIDE VIEW
5.5"
14cm
PLUMBING SIDE VIEW
Figure 2.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
12
Section 3. Installation Instructions
PLUMBING CONNECTIONS
Figure 3.
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CAUTION
HEATER
TO
POOL
FROM
FILTER
Before operating the heater on a new installation, turn on
the circulation pump and bleed all the air from the ﬁlter
using the air relief valve on top of the ﬁlter. Water should
ﬂow freely through the heater. Do not operate the heater
unless water in the pool/spa is at the proper level. If a
manual by-pass is installed, temporarily close it to insure
that all air is purged from the heater.
PUMP
FILTER
MANUAL
BY-PASS
GATE
VALVE
FROM
POOL
3-Way
Valve
WATER CONNECTIONS
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Chlorinator
Check Valve
Heater
Main
Drain
Filter
Spa
Pool
Pump
From Pool
3-Way
Valve
3-Way
Valve
Figure 4.
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NOTICE:,IWKHKHDWHULVSOXPEHGLQEDFNZDUGVLWZLOOF\FOHFRQWLQXRXVO\0DNHVXUHSLSLQJIURP¿OWHULVQRWUHYHUVHG
ZKHQLQVWDOOLQJKHDWHU
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MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 13
VALVES
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V\VWHPWRLVRODWHWKHHTXLSPHQWIURPWKHSRRORUVSD&KHFNYDOYHVDUHUHFRPPHQGHGWRSUHYHQWEDFNVLSKRQLQJ%DFN
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CAUTION
Exercise care when installing chemical feeders so as to not allow back siphoning of chemical into the heater, ﬁlters or
pump. When chemical feeders are installed in the circulation of the piping system, make sure the feeder outlet line is
down stream of the heater, and is equipped with a positive seal noncorrosive “Check Valve”, (P/N R172288), between
the feeder and heater.
MANUAL BY-PASS
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DPDQXDOE\SDVVVKRXOGEHLQVWDOOHGDQGDGMXVWHG$IWHULQVWDOOLQJWKH
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Model
125
Min. (GPM) (LPM) Max. (GPM) (LPM) *
20 (76)
Warm water out
70 (265)
* Do not exceed the maximum recommended flow
rate for the connecting piping.
Cool water in
Table 1.
See page 34 for Pressure Relief Valve Installations.
1. Set Manual By-Pass Valve.
2. Remove Handle.
BELOW POOL INSTALLATION
INLET FROM HEATER
OUTLET TO POOL
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Figure 5.
CAUTION
BELOW OR ABOVE POOL INSTALLATION
The water pressure switch is set in the factory at 3.00 PSI (± 0.75 PSI). This setting is for a heater installed at pool level.
If the heater is to be installed more than 1’ above or below, the water pressure switch must be adjusted by a qualiﬁed
service technician. See page 34, Figure 29.
FLOW SWITCH
If the heater is installed more than 5’ above the pool or more than 4’ below the pool level, you will be beyond the limits
of the pressure switch and a ﬂow switch must be installed. Locate and install the ﬂow switch externally on the outlet
piping from the heater, as close as possible to the heater. Connect the ﬂow switch wires in place of the water pressure
switch wires.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
14
Section 3. Installation Instructions
GAS CONNECTIONS
GAS LINE INSTALLATIONS
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The gas meter should be checked to make sure that it will supply enough gas to the heater and any other appliances that
may be used on the same meter. The gas line from the meter will usually be of a larger size than the gas valve supplied
with the heater. Therefore a reduction of the connecting gas pipe will be necessary. Make this reduction as close to the
heater as possible.
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GURSEHWZHHQVWDWLFDQGG\QDPLF7KHJDVVXSSO\PXVWEHLQVWDOOHGLQDFFRUGDQFHZLWKWKHNational Fuel Gas Code,
ANSIZ223.1RUVWDQGDUGCSA B149.1Natural Gas and Propane Installation CodesDVDSSOLFDEOHDQGDOODSSOLFDEOHORFDO
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NOTE
A manual main shut-off valve must be installed externally to the heater.
WARNING
DO NOT INSTALL THE GAS LINE UNION INSIDE THE HEATER CABINET. THIS WILL VOID YOUR WARRANTY.
SEDIMENT TRAPS
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18–24" of 3/4"
Manual
Gas line from
Shut-off
Valve
Valve
1" Dia. or larger
(See "Recommended
Pipe Sizes" Chart)
Bell
Reducer
At least 9"
Union
At least 3"
Sediment
Trap
Figure 6.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation 15
GAS PIPE SIZING
STAGE TWO “LOW PRESSURE” GAS PIPE SIZING
PIPE SIZING FOR GAS LINE CONNECTIONS
MAXIMUM EQUIVALENT PIPE LENGTH (Ft.)
Natural Gas at 1000 B.T.U. per Cubic Foot
Propane Gas at 2500 B.T.U. per Cubic Foot
1/2”
MODEL
3/4”
1”
1-1/4”
1-1/2”
2”
2-1/2”
NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO NAT PRO
125
-
20’
50’
80’
125’ 250’ 450’ 600’
-
-
-
-
-
-
Table 2.
TESTING GAS PRESSURE
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WHVWLQJRIWKDWV\VWHPDWWHVWSUHVVXUHVLQH[FHVVRISVLJN3D7KHKHDWHUPXVWEHLVRODWHGIURPWKHJDVVXSSO\
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HTXDOWRRUOHVVWKDQSVLJN3D
CHECKING THE GAS PRESSURE THROUGH THE COMBINATION GAS CONTROL VALVE
WARNING
Risk of ﬁre and explosion. Improper installation, incorrect adjustment, alteration, service, or maintenance of the Combination
Gas Control Valve can lead to ﬁre or explosion, causing loss of life, personal injury, and/or property damage. If it is necessary to
adjust the gas valve, this must be done by only by a qualiﬁed service agency. These instructions are for the use of qualiﬁed
service technicians only!
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To Air Flow
Switch
Connection for Service
To Gas
Valve Vent
To Air Flow
Switch
Connection for Test
To High Side
of Differential
Pressure Gauge
To Gas
Valve Vent
Pressure Tap
Inlet
Vent
Pressure Tap
Figure 7.
To Low Side of
Differential Pressure Gauge
GAS PRESSURE REQUIREMENTS
CAUTION
The use of Flexible Connectors (FLEX) is NOT recommended unless they are properly sized according to
the supplier recommendations for the heater rating.
Rev. B 8/14
MASTERTEMP® 125 HEATER GAS PRESSURE:
NATURAL AND PROPANE:
MAXIMUM INLET: 14 INCHES W.C.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
16
Section 3. Installation Instructions
OUTDOOR INSTALLATION (U.S. and Canada)
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WARNING
Risk of explosion if a unit burning propane gas is installed in a pit or other low spot. Propane is heavier than air. Do not
install the heater using propane in pits or other locations where gas might collect. Consult your local building code ofﬁcials to
determine installation requirements and speciﬁc installation restrictions of the heater relative to propane storage tanks and ﬁlling
equipment. Installation must meet the requirements for the Standard for the Storage and Handling of Liquid Petroleum Gases,
ANSI/NFPA 58 (latest edition) in the U.S., or CAN/CSA B149.2 (latest edition) in Canada. Consult local codes and ﬁre protection
authorities about speciﬁc installation restrictions.
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.LW31
For Heater mounting
bolts and clamps,
purchase separately
Bolt Down Bracket Kit,
Part No. 460738.
Lead
Anchor
HEATER CLEARANCES – OUTDOOR
IMPORTANT!
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EVESWITHAPROPERGUTTERDRAINAGESYSTEM4HEHEATERMUSTBESETONALEVELFOUNDATION
for proper drainage.
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DURXQGWKHKHDWHUPXVWEHRSHQRQWKUHHVLGHV'2127XQGHUDQ\FLUFXPVWDQFHVLQVWDOOWKHKHDWHUXQGHU$1<GHFN
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EHORZRUWRHLWKHUVLGHRIDQ\RSHQLQJLQWRDEXLOGLQJ
2ULHQWWKHKHDWHUIRUFRQYHQLHQWDFFHVVWRWKHZDWHUFRQQHFWLRQVDQGWKHJDVDQG
HOHFWULFDOFRQQHFWLRQV
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OLQHVHWEDFNUHTXLUHPHQWVVHHSDJHIRULQVWDOODWLRQLOOXVWUDWLRQ
3 ft. (1 M) or more
CAUTION
If installing the heater next to or near an air conditioning unit
or a heat pump, allow a minimum of 36 in. (91.4 cm) between
the air conditioning unit and the heater.
Figure 8.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions
OUTDOOR INSTALLATION
VENTING GUIDELINES
17
From window or door
4'
3'
SIDE VIEW
4'
Property Line
6 in
4'
From building wall
Force
Air Inlet
Exhaust Grill
(Vent)
es
od
g c nts.
n
i
e
ild m
bu uire
al
oc k req
l
k
ec bac
Ch set
for
Building
Vent Termination:
Must be at least 3 ft. above any forced
air inlet located within a 10 ft. radius.
Must be located 6 in. away from the building
wall and the following distances away from any building
wall openings, included but not limited to vented eaves,
doors, windows, gravity air inlet:
4 ft. below,
4 ft. horizontally
Figure 9.
INDOOR VENTING — General Requirements
The heater may be installed as a Category I or Category III appliance.
Vented Appliance (Category I) – Vertical only
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Vented Appliance (Category III) – Vertical or Horizontal
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,I\RXDUHFRQVLGHULQJFRQQHFWLQJWKLVKHDWHUWRDSUHH[LVWLQJYHQWV\VWHPPDNHVXUHWKDWWKHYHQWV\VWHPPHHWVWKH
DSSURSULDWHYHQWLQJUHTXLUHPHQWVDVJLYHQLQWKLVPDQXDORQSDJHV,IQRWUHSODFHWKHYHQWV\VWHP'2127XVH
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H[FHHGWKHOHQJWKWKDWLVOLVWHGLQ7DEOHRQSDJH
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
18
Section 3. Installation Instructions
HEATER CLEARANCES — General Requirements
INDOOR INSTALLATION (U.S.) OR OUTDOOR SHELTER (CANADA)
7KHIROORZLQJFOHDUDQFHVPXVWEHPDLQWDLQHGIURPFRPEXVWLEOHVXUIDFHV
(*) For service access, it is advisable to allow for
sufficient clearance on at least one door panel.
TOP...............................6 in. (15 cm)
15 cm
(6 in)
EXHAUST SIDE ...........6 in. (15 cm)
HEADER SIDE .............6 in. (15 cm)
DOOR PANELS† .........6 in. (15 cm)
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VRWKDWWKHYHQWSLSHGRHVQRWLQWHUIHUHZLWKDGMXVWPHQWRIWKHRSHUDWLQJ
FRQWUROV7KHFRQWUROSDQHOORFDWHGRQWKHWRSSDQHOFDQEHURWDWHGWRDQ\
RIWKHWKUHHVLGHVRIWKHKHDWHUIRUHDV\DFFHVV+RZHYHUWKHFRQWUROSDQHO
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15 cm*
(6 in)
15 cm*
(6 in)
15 cm
(6 in)
Figure 10.
OUTSIDE VENT COVER REMOVAL
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LQVWDOODWLRQ5HPRYHWKHRXWVLGHYHQWFRYHUIRURXWGRRUVKHOWHULQVWDOODWLRQ
Air Supply Requirements Guide
for MasterTemp® 125 Heater
COMBUSTION AIR SUPPLY
)RULQGRRULQVWDOODWLRQWKHKHDWHUORFDWLRQPXVWSURYLGH
VXI¿FLHQWDLUVXSSO\IRUSURSHUFRPEXVWLRQDQGYHQWLODWLRQ
RIWKHVXUURXQGLQJDUHD
7KHPLQLPXPUHTXLUHPHQWVIRUWKHDLUVXSSO\VSHFLI\WKDW
WKHURRPLQZKLFKDKHDWHULVLQVWDOOHGVKRXOGEHSURYLGHG
ZLWKWZRSHUPDQHQWDLUVXSSO\RSHQLQJVRQHZLWKLQ
LQFKHVFPRIWKHFHLOLQJWKHRWKHUZLWKLQLQFKHV
FPRIWKHÀRRUIRUFRPEXVWLRQDLULQDFFRUGDQFHZLWK
WKH ODWHVW HGLWLRQ RI$16, = RU WKH 1DWLRQDO )XHO
*DV FRGH WKH &6$ % 1DWXUDO *DV DQG 3URSDQH
,QVWDOODWLRQ&RGHVDVDSSOLFDEOHDQGDQ\ORFDOFRGHVWKDW
PD\DSSO\7KHVHRSHQLQJVVKDOOGLUHFWO\RUWKURXJKGXFW
FRQQHFWWRRXWGRRUDLU
Minimum Net Free Open Area for Each Opening*
(Square Inches/Centimeters)
All Air From Inside Building
All Air From Outside Building
Model
125
Combustion
Vent
Combustion
Vent
200 sq. in.
1290 sq. cm.
200 sq. in.
1290 sq. cm.
50 sq. in.
323 sq. cm.
50 sq. in.
323 sq. cm.
* Area indicated is for one of two openings; one at floor level and one at the ceiling.
Table 3.
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RQSDJH
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions
19
$IRECT!IR)NTAKE$UCTWITHINCH06#0IPE)NDOOR)NSTALLATION
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7KHDLULQWDNHRSHQLQJ0867EHLQVWDOOHGDWOHDVWIWDERYHWKHURRIOLQHRUQRUPDOVQRZOHYHOVIRUIUHHDLUÀRZ7KH
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6HH)LJXUHEHORZ
Combustion 3 in. PVC Pipe
Inlet Air Intake Duct Requirements*
Combustion Air Intake 3 in. Pipe
(Vertical or Horizontal)
No. of 90° Elbows
0
1
2
3
4
Maximum Length in Feet (M)
70 ft. (21.3 M)
58 ft. (17.7 M)
46 ft. (14.0 M)
34 ft. (10.4 M)
22 ft. ( 6.7 M)
Table 4.
WARNING!
DO NOT USE PVC PIPE FOR FLUE
EXHAUST VENT. FLUE EXHAUST
VENT TEMPERATURES CAN BE IN
EXCESS OF 400° F. FLUE EXHAUST
VENT MUST BE CATEGORY I or
CATEGORY III METAL VENT.
Figure 11.
Note (*): Combustion Air Intake Duct Connection Kit (Call 1.800.831.7133 for part number) for all MasterTemp® 125
Heater models can be purchased separately. See page 52 for parts list.
NOTE
Each 90-degree elbow reduces the maximum horizontal PVC air intake duct run by 12 feet and each
45-degree elbow in the PVC air intake duct run reduces the maximum run by 6 feet. See the Table 5 above
for the maximum lengths using 90-degree elbows.
Corrosive Vapors and Possible Causes
Area
Likely Contaminants
Chlorinated swimming
pools and spas
Pool or spa cleaning chemicals. Acids,
such as hydrochloric or muriatic acid.
New construction and
remodeling areas
Glues and cements, construction
adhesives, paints, varnishes, and
paint and varnish strippers. Waxes and
cleaners containing calcium or sodium
chloride.
CAUTION
Chemicals should not be stored near the
heater installation. Combustion air can
be contaminated by corrosive chemical
fumes which can void the warranty.
Table 5.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
20
Section 3. Installation Instructions
VENT INSTALLATION – INDOOR INSTALLATION (U.S.) OR OUTDOOR SHELTER (CANADA)
(Category I)
NOTE *: Vent must be at least eight (8) feet away from
nearest vertical surface. Vents extending ﬁve (5) feet or
more above the roof must be braced or guyed.
Consult your local code ofﬁcials for detailed information.
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WRKDYHDFRQGHQVDWHGUDLQDVGHVFULEHGLQWKHYHQWLQJLQVWDOODWLRQLQVWUXFWLRQV
VERTICAL VENTING - NEGATIVE PRESSURE
(See Figures 12, 13 and 14)
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RI¿FLDOIRUGHWDLOHGLQIRUPDWLRQ'RQRWXVHDGUDIWKRRGZLWKWKLVKHDWHU
Clean the Interior Surface
Vent Body
V
4" x 8" Metal
Flue Collar
Vent Pipe
7RFRQQHFWDQHJDWLYHSUHVVXUHPHWDOJDVYHQWWRWKHKHDWHURUGHUWKHDSSURSULDWH
0HWDO)OXH&ROODUIURPWKHFKDUWEHORZ
Metal Flue Collar
Part No.
4 x 6”
77707-0076
4 x 8”
77707-0077
Combustion
Chamber
Flue Collar
Clean and RTV
This Surface
Figure 12.
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NOTICE:7DEOHLVIRULQVWDOODWLRQVLQZKLFKWKHWRWDOODWHUDOYHQWOHQJWKWKDWLVWKHKRUL]RQWDOGLVWDQFHIURPWKHÀXH
FROODUWRWKHPDLQYHUWLFDOSRUWLRQRIWKHYHQWLVOHVVWKDQWKHWRWDOYHQWKHLJKWWKHYHUWLFDOGLVWDQFHIURPWKHÀXHFROODU
WRWKHYHQWWHUPLQDWLRQDQGZKLFKKDYHWKUHHRUOHVVHOERZVLQWKHV\VWHP)RUYHQWLQJV\VWHPVZKLFKGRQRWPHHWWKHVH
FRQGLWLRQVFRQVXOWWKH1DWLRQDO)XHO*DV&RGH$16,=86RUWKHVWDQGDUGV&6$%DQG%&DQDGD
Read “VERTICAL VENTING – NEGATIVE PRESSURE” before using this table.
Table 5. – Permitted Minimum and Maximum Vent Heights By Size and Heater Model
Type "B" Double-Wall Vent with Type "B"
Double-Wall Connector in Feet (Meters)
Vent Size
Model 125
Height min./max.
6 in.
6 ft. (1.8)/100 ft. (30.5)
7 in.
6 ft. (1.8)/100 ft. (30.5)
8 in.
6 ft. (1.8)/100 ft. (30.5)
9 and 10 in.
6 ft. (1.8)/50 ft. (15.3)
Type "B" Double-Wall Vent with
Single-Wall Connector in Feet (Meters)
Model 125
Vent Size
Height min./max.
6 in.
6 ft. (1.8)/15 ft. (4.6)
7 in.
6 ft. (1.8)/8 ft. (2.4)
8 in.
Not Rec.
9 in.
Not Rec.
10 in.
Not Rec.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 21
NOTE
The allowable vent runs for each vent pipe diameter are different and can not be exceeded.
Each 90-degree elbow reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow
in the vent run reduces the maximum vent run by 6 feet. See Table 5 on page 20 for the maximum vent
lengths using 90-degree and 45-degree elbows.
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WARNING
Risk of ﬁre or asphyxiation if vent is not assembled
according to manufacturer’s instructions or
if vent parts from different manufacturers are
mixed. Vent parts from different manufacturers
ARE NOT interchangeable. Mixing parts from
more than one manufacturer may cause leaks or
damage to vent. When assembling a vent, pick one
manufacturer and be sure that all vent parts come
from that manufacturer and are speciﬁed by the
manufacturer for your system. Follow manufacturer’s
instructions, local code requirements, National
Fuel Gas Code requirements (U.S.) or standards
CSA B149.1 and B149.2 (Canada) carefully during
assembly and installation.
Listed
Termination
Cap
Min. 10 Ft.
Storm Collar
Flashing
6" Minimum
Clearance to
Combustible
Materials
Class B Double Wall
Metal Vent Pipe
Vent
Body
Firestop
Metal Flue
Collar
Support Vertical
Vent Pipe so
adapter does not
take weight of
pipe.
Figure 13. – Typical Metal Vent Pipe Installation - U.S.
(Vertical – Negative Pressure)
Min. 2 Ft.
(.7 M)
Approved
Termination
Cap
Min. 10 Ft. (3.3 M)
Storm Collar
Flashing
6" (15 cm) Minimum
Clearance to Combustible
Materials
Double Wall
Metal Vent Pipe
Vent
Body
Metal Flue
Collar
Condensate
Drain w/trap
Firestop
Double Wall
Metal Vent Tee
Support Vertical
Vent Pipe so
adapter does not
take weight of
pipe. Dispose
of condensate
according to
local codes.
Figure 14. – Typical Metal Vent Pipe Installation
Canada (Vertical – Negative Pressure)
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
22
Section 3. Installation Instructions
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WARNING
Fire Hazard. Do not vent the heater directly into a masonry chimney. Installation into a masonry chimney must use a chimney
liner and must meet the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation
Codes requirements and all local code requirements.
WARNING
Risk of ﬁre, carbon monoxide poisoning, or asphyxiation. It is recommended to use a CO Monitor and Fire Alarm in rooms
that contain gas ﬁred appliances.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 23
HORIZONTAL OR VERTICAL VENTING - POSITIVE PRESSURE (See Figures 15, 16, and 17)
(Category III)
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WKHYHQWRULQVLGHWKHUHTXLUHGFOHDUDLUVSDFHVXUURXQGLQJWKHYHQW6HH7DEOHIRUPD[LPXPSHUPLVVLEOHYHQWOHQJWKV
NOTE
The allowable vent runs for each vent pipe diameter are different and can not be exceeded. Each 90° elbow
reduces the maximum horizontal vent run by 12 feet and each 45-degree elbow in the vent run reduces the maximum
vent run by 6 ft. See the Table 6 below for the maximum vent lengths using 90° elbows.
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4 in. Special Gas Vent
(Vertical or Horizontal)
No. of 90° Elbows
0
1
2
3
4
Maximum Length in Feet (M)
70 ft. (21.3 M)
58 ft. (17.7 M)
46 ft. (14.0 M)
34 ft. (10.4 M)
22 ft. ( 6.7 M)
Table 6.
*Minimum vent length is one foot (.34M),
or in accordance with vent manufacturer’s
instruction, and local and national codes.
Horizontal vents 3’(1M) or less in length
do not require a condensate tee, but must
slope down toward the outlet at 1/4” to the
foot (2cm/M) to allow condensate to drain.
CAUTION
Do NOT combine exhaust vent pipes to a
common exhaust vent in multiple unit
installations. Run separate vent pipes.
CONNECTING SPECIAL METALIC GAS VENT TO THE HEATER
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Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
24 Section 3.
Installation Instructions
WARNING
Risk of carbon monoxide poisoning if adapter is improperly attached. Mechanical connections (such as screws) can cause
cracking and leaks in the adapter. Do NOT drill holes or use screws to connect the appliance adapter to the heater vent body.
Attach with manufacturer’s speciﬁed adhesive.
WARNING
Risk of ﬁre or asphyxiation if vent is not assembled according to manufacturer’s instructions or if vent parts from different
manufacturers are mixed. Vent parts from different manufacturers ARE NOT interchangeable. Mixing parts from more than one
manufacturer may cause leaks or damage to vent. When installing a vent, pick one manufacturer and be sure that all vent parts
come from that manufacturer and are speciﬁed by the manufacturer for your system. Follow manufacturer’s instructions and
local and National Fuel Gas Code (U.S.) or CSA B149.1, Natural Gas and Propane Installation Codes (Canada) requirements
carefully during assembly and installation.
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Chimney or Gas Vent
Vent Cap and
Riser Furnished
by Installer
Outlet Air
Opening
Side
Wall Vent
Inlet Air
Opening
Figure 15.
Chimney or Gas Vent
Vent Cap and
Riser Furnished
by Installer
Outlet Air Opening
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VWDQGDUG
Side
Wall Vent
Inlet Air Opening
Heater
Figure 16.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 25
4' Min.
Vent
Termination
Vent
Termination
4' Min.
Vent
Termination
1' Min.
4' Min.
1' Minimum
above snow or
finished grade
(whichever is
higher)
Max. 12"
Min. 3"
4' Min.
At least 7'
above grade
adjacent
to public
walkways
Gas Meter
Forced Air
Inlet
3' Minimum clearance if
horizontal distance to
exhaust opening is less
than 10 feet.
Figure 17.
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WARNING
Fire Hazard. Do not run the heater vent into a common
vent with any other appliance. Do not run the Special
Gas Vent into, through, or within any active vent such
Metal Special
Support
Gas Vent
weight
requires
of pipe
Appliance
Adapter
Condensate
Tee
Listed
Terminal
Metal
Vent
Body
Condensate
drain w/Trap
(Optional)
Slope at least
1/4" per foot
(2 cm per Meter)
down towards
condensate drain
3" (7.6 cm) Min.,
12" (30.5 cm) Ma
Clearance
Figure 18.
Rev. B 8/14
®
MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide
26
Section 3. Installation Instructions
OUTDOOR SHELTER INSTALLATION
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GLUHFWRSHQLQJVLQWRRFFXSLHGDUHDV
WARNING
Risk of asphyxiation if exhaust is not correctly vented. Follow venting instructions exactly when installing heater. Do not
use a draft hood with this heater, as the exhaust is under pressure from the burner blower and a draft hood will allow exhaust
fumes to blow into the room housing the heater. Exhaust venting to the outdoors is required for all outdoor shelter installations.
WARNING
Risk of explosion if a unit burning propane gas is installed in a pit or other low spot. Propane is heavier than air. Do
not install the heater using propane in pits or other locations where gas might collect. Consult your local building code ofﬁcials
to determine installation requirements and speciﬁc installation restrictions of the heater relative to propane storage tanks and
ﬁlling equipment. Installation must meet the requirements for the Standard for the Storage and Handling of Liqueﬁed Petroleum
Gases, CAN/CSA B149.2 (latest edition) or ANSI/NFPA 58 (latest edition). Consult local codes and ﬁre protection authorities
about speciﬁc installation restrictions.
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GARAGE OR UTILITY ROOM INSTALLATION
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WARNING
Risk of ﬁre and explosion if installed at ﬂoor level in an automotive garage or near gasoline or ﬂammable liquid storage.
Gasoline fumes are heavier than air and will settle to ﬂoor level in closed spaces. Gasoline fumes and spilled gasoline or other
volatile liquids (such as some paints and varnishes) will travel across the ﬂoor and can be ignited by a gas appliance.
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Leave 3 ft. (1 m)
or more of clearance
above heater
CAUTION
A Propane (LPG) fired heater must not be installed in a garage in
Massachusetts, by order of the Massachusetts State Fire Marshal. For
more information, call the Massachusetts State Fire Marshal’s ofﬁce.
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Leave 6 in. (15 cm)
of clear space between
heater and combustible
surface.
RAISE AT LEAST
18 in. (46 cm) above floor 18 in.
to avoid flammable vapors
Figure 19.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 27
CONTROL PANEL INDEXING
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Top Panel
Door Acess Panel
Door Acess Panel
Figure 20.
FINAL INSTALLATION CHECK
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For Heater mounting
bolts and clamps,
purchase separately
Bolt Down Bracket Kit,
Part No. 460738.
Lead
Anchor
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Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
28 Section 3.
Installation Instructions
ELECTRICAL CONNECTIONS
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CAUTION
This heater is designed to operate at 120 or 240 VAC. It is not recommended to be connected to OR operate on a 208 VAC.
NOTE
s Before making any electrical connections to the power supply, remove the access door panels,
open the control box and plug in the correct plug (120 volt or 240 volt).
CAUTION
The heater ships from the Factory with the 240V plug installed. Installing the 120V plug and then connecting the heater
to 240V line current will immediately destroy the transformer, control board and ignition control module, and will void
warranty. If you install the 240V plug and connect the heater to 120 volts line current, the heater will not operate.
s )FANYOFTHEORIGINALWIRINGSUPPLIEDWITHTHISHEATERMUSTBEREPLACEDINSTALLERMUSTSUPPLY.O!7'6½#5,
approved AWM low energy stranded) copper wire or it’s equivalent.
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AC Plug
120 Volt
or
240 Volt
Figure 21
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 29
CONNECTION OF FIREMAN’S SWITCH OR REMOTE CONTACT
CAUTION
If, while there is line voltage connected to the heater, you touch either line voltage terminal with any 24VAC wire that
is connected to the control board (including the Fireman’s Switch jumper), you will immediately destroy the control
board and void the warranty.
Figure 22
REMOTE CONTROL CONNECTIONS
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J6
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24VAC
BK
O
OPERATING CONTROL
O
MEMBRANE PAD
CONNECTION
ENABLE TOGGLE
DISABLE TOGGLE
W
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FUSE
FUSE
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TRANS
ER[
E To connect a 3-Wire Control:
TERMINAL BOARD
F
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R
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TRAN S
FL
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W
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Rev. B 8/14
GND
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BOX
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L2
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BK
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24VAC
Time Clock or Remote
(Purchase Separately –
Supplies Power to
Circulator Pump)
Fireman's Switch
Completes the heater
24 Volt AC Control
Board Circuit.
DO NOT connect this
circuit to Line Voltage!
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
30
Section 3. Installation Instructions
HEATER WIRING DIAGRAM
(3-WIRE SYSTEM)
CONNECTION DIAGRAM
AGS Switch
Air Flow Switch
Stack Flue Sensor
Extra Switch 1
Gas Valve
Hi-Limit Switch
Y/R
Y/BL
Y/O
Pressure Switch
Y/W
Y
Y
Y
Y
Y
O
O
BL
W
O
O
W
THERMISTOR
HLS
FS
PS
24VAC
R
Y
BR
BR
PR
PR
R
VAL
TH
IND
GND
24VAC
Y/W
ES1
OPERATING CONTROL
AFS
NA/LP
Models Only
Y/W
J6
Y
1
BL
Y/O
Y/BL
Y/R Y
Y
Y
Y
MEMBRANE PAD
CONNECTION
AGS
SFS
6
JMP3
GAS
1
External Control Interface Circuit Disabled,
Heater Membrane Pad Enabled
Spa Line
Common Line
Pool Line
JMP
External Control Interface
W
Y
BK
1
JMP
F1
24
F2 VAC
DIAGNOSTIC INDICATOR
1
IGNITION CONTROL
MODULE
Y
External Control Interface Circuit
Enabled, "Pool On" and "Spa On"
Keys Disabled. "OFF" Key on
Membrane Pad Remains Functional.
Y
24 VAC
S1
240
GY
S1/
120
L1 L2
GY BK
S2
SEC
TH IND VAL GND
Y/W
GY
Y/O
W
Y/BL
Y/R
O
BK
120 VAC
IGNITER
Y/W
W
GND
BK
Plug –12 pin
120V – Black
240V – Red
O
GY
BK
L1
BK
F1
F
I
R
E
M
A
N
S
TRAN S
FL
S
W
I
T
C
H
L2
BM
BK
1
R
Y
GY
R W
W
R
GY
BK
W
R
W
Y
R
BK
Y
BLOWER
BL
JUNCTION BOX
Line 1
BK
Line 2
R
Ground
G
NOTICE: Touching any 24VAC wire, including
the Fireman's Switch wire, to any 120/240V
terminal while the heater is connected to line
power will immediately destroy the control
board and void the warranty.
BL
G
GND
Replace jumper with
leads to Fireman"s
Switch (field installed)
12 Position
Receptacle
Figure 24.
GND
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 3. Installation Instructions 31
HEATER ELECTRICAL SCHEMATIC LADDER DIAGRAM
LADDER DIAGRAM
120/240
VAC
L1
L2
IGNITER
L1
S1
F1
F2
S2
L2
BLOWER
GND
120/240
VAC
CLASS II
TRANSFORMER
24 VAC
OPERATING
CONTROL
24 VAC
24 VAC
GND
AIR
FLOW
SWITCH
LOGIC
24V
TH
WATER
PRESSURE
SWITCH
HI
LIMIT
SWITCH
IND
COM NO
AGS
SWITCH
VAL
GAS VALVE
STACK FLUE
SENSOR
THERMISTOR
SENSOR
NOTES:
1.)
L1
S2
L2
F1
GND
F2
IND
S1
24 VAC
VAL AND TH
ARE CONNECTED ON THE IGNITION MODULE.
Rev. B 8/14
2. )
PIN AND SOCKET CONNECTOR.
3. )
IF ANY OF THE ORIGINAL WIRES AS SUPPLIED
WITH THE APPLIANCE MUST BE REPLACED,
THEY MUST BE REPLACED WITH TYPE 105˚ C
OR ITS EQUIVALENT.
Figure 25.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
32 Section 4.
Operation Instructions
Operation Instructions
BASIC SYSTEM OPERATION
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FOR YOUR SAFETY: READ BEFORE LIGHTING
WARNING
If you do not follow these instructions exactly, a fire or explosion may result causing property damage,
personal injury or loss of life.
Do not attempt to light the heater if you suspect a gas leak. Lighting the heater can result in a fire or
explosion which can cause personal injury, death, and property damage.
START-UP AND OPERATION
START-UP AND SHUTDOWN INSTRUCTIONS ARE ON THE LABEL ATTACHED TO THE COVER OF THE APPLIANCE
CONTROL BOX.
BEFORE START-UP
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WHAT TO DO IF YOU SMELL GAS
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DQGWKHDUHDDURXQGWKHKHDWHUDQGLWVH[KDXVWYHQW
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MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 4. Operation Instructions 33
OPERATING INSTRUCTIONS
67235HDGWKHVDIHW\LQIRUPDWLRQRQSDJH
Water
6HWERWKSRRODQGVSDWKHUPRVWDWVWRWKHORZHVWVHWWLQJV
Pressure
Switch
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6KXW2II9DOYHDVVKRZQEHORZ
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EXUQHUE\KDQG
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ORFDWHGRQHDFKGRRUWKHQOLIWXSDQGRXWIURPWKHERWWRPRIWKHSDQHO
WRUHPRYH,IQHFHVVDU\WKHVFUHZVPD\EHXVHGDVKDQGOHV
VHH)LJXUH
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VHH)LJXUH
Figure 26.
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RSHUDWLQJWKHKHDWHU
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7XUQRQDOOHOHFWULFSRZHUWRWKHDSSOLDQFH
3UHVVHLWKHUWKH322/21RU63$21EXWWRQVZLWFKRQWKHRSHUDWLQJ
FRQWURO
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Figure 27.
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Push toggle switch away
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from you to switch ON.
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WKHPDQXDOJDVFRQWUROYDOYHWRWKHDSSOLDQFH
,IWKHDSSOLDQFHZLOOQRWRSHUDWHIROORZWKHLQVWUXFWLRQVEHORZ
Manual
³7278512))*$6727+($33/,$1&(´DQGFDOO\RXUVHUYLFH
Shut-off
WHFKQLFLDQRUJDVVXSSOLHU
Valve
TO TURN OFF GAS TO APPLIANCE
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5HSODFHWKH$FFHVV'RRU3DQHOV
Rev. B 8/14
MANUAL SHUT-OFF VALVE LOCATION
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Figure 29.
34
Section 4. Operation Instructions
SAFETY CONTROLS
Figure 28.
AIR FLOW SWITCH (AFS)
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SUHVVXUHVZLWFKDQGDOOVDIHW\VZLWFKHVDUHFORVHG
WATER PRESSURE SWITCH
Air Flow Switch
WARNING
Hazardous pressure. Do not bypass the Water Pressure Switch or render
it inoperable.
Figure 29.
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Water
Pressure
Switch
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SVLN3DNOTE: See, Below Pool Level Installation instructions on
page 13,IWKHSUHVVXUHVZLWFKLVRQHIHHW0EHORZRUDERYHWKHSRROZDWHU
OHYHOUHVHWWKHVZLWFKVRWKDWLWLVRSHQZKHQWKHSXPSLVRIIDQGFORVHGZKHQ
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NOTICE::KHQWKHKHDWHULVPRXQWHGPRUHWKDQ¿YHIHHW0DERYH
RUIRXUIHHW0EHORZWKHGHFNOHYHOD3UHVVXUH
Turn star wheel clockwise to raise
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pressure set point if pressure switch is
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more than 4 feet (1.2M) below water level
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Star Wheel
HIGH LIMITS
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A reference scale is on
the back of pressure switch
Turn star wheel counterclockwise to lower
pressure set point if pressure switch is more
than 5 feet (1.5M) above water level
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Figure 30.
Rev. B 8/14
Section 4. Operation Instructions 35
SAFETY CONTROLS (continued)
Flame Current
Check Point
OPERATION OF IGNITION MODULE
Diagnostic LED
1 Flash - Air Flow Fault
2 Flashes - Flame No Call for Heat
3 Flashes - Ignition Lockout
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OPERATING THE CONTROL PANEL
Figure 31.
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Temperature
Up and Down
POOL ON
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Digital Temperature
Display
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▲ TEMP
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System Operation
Indicator Lights
Dual Temperature
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Heater "OFF"
Switch
Figure 32.
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WARNING
Risk of explosion or ﬁre causing burns or death if safety interlocks are disabled. DO NOT attempt to operate heater when
SERVICE HEATER light is on or if blower or burner will not start. Instead, follow instructions under “To Switch Off Gas to the
Appliance,” and call a qualiﬁed service technician to repair unit.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
36
Section 4. Operation Instructions
TEMPERATURE SETTING
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MAXIMUM TEMPERATURE SET POINT
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Top Panel
T
E
S AX
M
Door Acess Panel
Door Acess Panel
S1
T
E
S AX
M
S1
Figure 33.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Figure 34.
Rev. B 8/14
Section 5. Troubleshooting 37
Troubleshooting Instruction
Initial Troubleshooting
Only qualified, trained service technicians with appropriate test equipment should service the heater. Remember
that all parts of the system affect heater operation. Before starting this troubleshooting procedure, make sure that
the pump is running correctly, that there are no blockages in the system, that the valves are correctly set and that
the time clock is correctly set and is running.
IMPORTANT! READ ME FIRST!
NOTICE: Installing the black 120 volt plug in the control box and
then connecting the heater to a 240 volt line will destroy the trans former, control broad, and ignition control module, and will void the
warranty. If you install the red 240 volt plug and then connect the
heater to a 120 volt line, the heater will not operate.
READ THE FOLLOWING CAREFULLY:
1. Check the line voltage to your heater. This heater will operate
on either 120 Volts AC or 240 Volts AC.
2. Remove the covers and check the 12-pin plug in the back of the
control box. The plug must match the voltage in the heater circuit.
3. If the 12-pin plug is not plugged into the back of the control
box, select the correct plug from the bag in the control box
and plug it in. The BLACK plug is for 120 volts, the RED plug
is for 240 volts.
Start here for directions to specific Troubleshooting Chart
Is green “POOL” or “SPA”
LED “on”?
NO
Go to chart “HEATER WILL
NOT FIRE - A”
(Page 38)
YES
Go to chart “HEATER WILL
NOT FIRE - B”
(Page 39)
YES
Is red “SERVICE SYSTEM”
LED “on”?
NO
Is red “SERVICE HEATER”
LED “on”?
YES
NO
Are any red diagnostic LED’s on back of
board (AGS, AFS,
SFS, HLS, PS or
THERMISTOR) “on”
NOTICE: Any or all of the diagnostic LED’s may come “on”
momentarily when you turn on
the power to the heater.
Go to specific safety switch
troubleshooting chart
(Pages 41 and 42)
YES
Go to chart ‘HEATER WILL
NOT FIRE -C”
(Page 40)
NO
Turn off power to heater for
about 5 seconds, and turn
back on. Make sure temperature setting is above water
temperature. Wait one minute.
Do any diagnostic LED’s on
back of board (AGS, AFS,
SFS, HLS, PS, or
THERMISTOR) come “on”
and stay on?
YES
YES
NO
Does red “SERVICE
HEATER” LED come
“on”
NO
Verify that water temperature setting is
above water temperature reading. If it is,
and heater either will not fire or no red
LED’s come “on”, replace Control Board.
WARNING Hazardous voltage. Can shock, burn or kill.
Disconnect power before servicing any components.
Rev. B 8/14
WARNING Fire and Explosion hazard. Do not jumper
switch terminals to remedy a failed safety switch.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
38
Section 5. Troubleshooting
Heater Will Not Fire - A
Start
NO
Is green “SPA” or
“POOL” LED “on”
YES
Check that correct 12-pin
plug is installed (red is
240V, black is 120V)
YES
Depress “POOL” or “SPA” ON
button on Membrane Pad.
Does “POOL” or “SPA” LED
come on?
NO
YES
Check for line voltage to
heater.
NO
Heater should fire on demand
for heat.
Restore power to heater.
YES
NO
If plug is not installed:
Install correct plug.
240V plug in 120V
circuit: Replace with
correct plug.
120V plug in 240V
circuit: Replace transformer, control board,
and ignition control
module (see “HEATER
WILL NOT FIRE-C and
-D”, Pages 40 and 41).
Check fuse and all
other 24V components
for damage.
Check for 24 VAC at secYES ondary of Transformer.
NO
Check for Line Voltage
between L1 and L2 terminals
on Terminal Board.
NO
YES
Check for Line Voltage at
Transformer primary pins.
White connects to Pin 3 on
Transformer, Black to Pin 2,
Orange to Pin 1.
240V: check Pin1 to Pin 3.
120V: check Pin 2 to Pin 3.
Jumper Fireman’s Switch at
Terminal Board and depress
“POOL” or “SPA” ON button on
membrane pad. Does “SPA” or
“POOL” LED come “on”?
NO
Check wiring connections
between power supply and
Junction Box and between
Junction Box and Terminal
Board; restore continuity.
Check wiring connections
between Terminal Board and
Transformer primary and
restore continuity.
YES
Replace Transformer.
YES
Check Fireman’s Switch circuit
connections (time clock, wiring,
external controller relay).
NO
YES
NO
Leaving jumper in place,
check for 24 VAC between
Fireman’s Switch terminals
and ground.
Remove jumper. Check ribbon
cable connection between
Membrane Pad and J6 on
Control Board. Depress
“POOL” or “SPA” On pad
again. Does “POOL” or “SPA”
LED come on?
Jumper pins 6 and 5 on J6 of
Control Board. Does “SPA”
LED come on?
Jumper pins 6 and 4 on J6 of
Control Board. Does “POOL”
LED come on?
NO
Remove jumper. Check wiring
between Transformer and J7
terminals on Control Board
and between J7 and
Fireman’s Switch on Terminal
Board, check fuse, and
restore continuity.
YES
Heater should fire on
demand for heat.
YES
Replace Membrane Pad.
NO
Replace Control Board.
GO TO
“HEATER WILL NOT FIRE - B”
Page 39
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 5. Troubleshooting 39
Heater Will Not Fire - B
Start
Is red “SERVICE
HEATER” LED “on”
NO
Is red “SERVICE SYSTEM”
LED on?
NO
YES
YES
Verify that pump is on, filter is
not blocked, and the water
flow is above the minimum
requirement.
NO
YES
With pump running, adjust
Water Pressure Switch to
lower pressure until ‘SERVICE SYSTEM” LED goes
out. Then verify that “SERVICE SYSTEM” LED goes on
with pump off.
Increase POOL/SPA temperature setting on Membrane
Pad above actual water temperature. Heater should fire
on demand for heat. If not,
and no other red LED’s light,
replace Control Board.
Service pump/filter and eliminate other flow obstructions.
YES
Heater should fire on call for
heat. Re-verify that water flow
is above minimum requirement.
NO
Minimum Flow Requirements
Check that water pressure is
within the adjustment range of
the Pressure Switch (0-5 psig)
NO
Model
175
200
250
300
400
YES
CONTINUE
Verify that switch wiring is OK
and Pressure Switch port is
not blocked, and replace
water Pressure Switch.
Flow
20 gal/min (76 LPM)
20 gal/min (76 LPM)
25 gal/min (95 LPM)
30 gal/min (114 LPM)
40 gal/min (151 LPM)
If water pressure is outside of
adjustment range that will
open switch with pump off
and close switch with pump
on, replace with flow switch
set above minimum flow
requirement.
Minimum Flow Requirements
Model
175
200
250
300
400
Check whether any of the
red diagnostic LED’s on back
of board (AGS, AFS, SFS,
HLS or PS) are “on”
YES
Flow
20 gal/min (76 LPM)
20 gal/min (76 LPM)
25 gal/min (95 LPM)
30 gal/min (114 LPM)
40 gal/min (151 LPM)
Go to “Diagnostic LED’s”,
(Pages 42 and 43)
NO
GO TO
“HEATER WILL NOT FIRE - C”
Page 40
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
40
Section 5. Troubleshooting
Heater Will Not Fire - C
Start
NO
Is “SERVICE HEATER” LED
“on”?
YES
If any red diagnostic LED’s
(AGS, AFS, SFS, HLS, PS, or
THERMISTOR) come “on”, go
to to Pages 42 and 43.
NO
Go to “INITIAL
TROUBLESHOOTING”
Turn off power to
heater for 5 seconds,
and turn back on.
Make sure temperature setting is above
water temperature.
Wait one minute.
YES
Does heater fire and
stay on?
CONTINUE
NO
NO
Did burner fire at all?
Did Blower come on?
YES
YES
Verify that gas is flowing to burner during
ignition try. Observe
gas meter for movement during ignition
try (wait for about 30
seconds after calling
for heat).
Go to “BURNER
TROUBLESHOOTING”
(Page 44)
Go to “HEATER WILL NOT
FIRE-D” (Page 41)
YES
Replace Ignition Control
Module.
YES
NO
Check for 24 VAC between
VAL and GND terminals on
Ignition Control Module.
SEE NOTE 2.
Check for 24 VAC between
VAL and GND terminals on
Control Board. SEE NOTE 2.
NO
Fix wiring between VAL and
GND terminals of Ignition
Control Module and Control
Board.
YES
Replace Control Board.
NO
NO
Check for 24 VAC
between TH and GND
terminals on Ignition
Control Module.
SEE NOTE 1.
NO
YES
Continue to observe heater
for several minutes. Cycle
heater on and off several
times. Observe for delayed or
rough ignition, poor combustion, premature extinction of
flame, evidence of boiling, or
operation of any diagnostic
LED. Go to pertinent troubleshooting section if any
malfunction is observed.
Check for 24 VAC
between TH and GND
terminals on Control
Board. SEE NOTE 1.
Verify that gas supply is open
all the way to Gas Valve, and
Gas Valve is set at “on”
position.
Check for 24 VAC to Gas
Valve terminals during ignition
try. (Voltage appears about 24
seconds after call for heat).
SEE NOTE 2.
YES
Replace Gas Valve with
identical part.
YES
NO
Fix wiring between TH and
GND terminals of Ignition
Control Module and Control
Board.
Replace Control Board.
Check for 24 VAC
between GAS terminals on Control
Board. SEE NOTE 2.
YES
Fix wiring between GAS terminals on Control Board and
Gas Valve.
NO
Replace Control
Board.
NOTE 1: Voltage appears immediately after call for heat, and may be
on for only about 30 seconds.
NOTE 2: Voltage appears about 24
seconds after call for heat, and may
be on for only about 7 seconds.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 5. Troubleshooting 41
Heater Will Not Fire - D
IMPORTANT! READ ME FIRST!
IMPORTANT! READ ME FIRST!!
If your heater is correctly connected to 240 Volts AC, the
Ignition Control Module (ICM) will convert the 240VAC to
an intermittent pulse to the ignitor. Digital meters don’t read
this type of signal well. (An analog meter will give a better
reading than a digital meter). If the ICM is bad, your volt-
meter will read either 0 VAC or 240 VAC. If your ICM is
good, your meter will read some voltage between 0 and
240 VAC. Exactly what reading you get will depend on the
meter, but with a good ICM, the reading won’t be 0 VAC or
240 VAC, but somewhere in between.
Start
Gas flows during ignition try, but burner
does not fire.
NO
Go back to chart “HEATER WILL
NOT FIRE-C” (Page 40).
YES
Check voltage across
igniter leads; OK?
NO
Replace Ignition
Control Module. On a
120 V installation,
check the ignitor for
damage if it has seen
240 VAC.
Rev. B 8/14
YES
Check gas pressure. OK?.
YES
Replace HSI Igniter.
NO
Increase gas flow into heater:
: Replace gas line with larger
line;
: Replace regulator;
: Replace meter; or
: All of the above.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
42
Section 5. Troubleshooting
Diagnostic LED's: AGS, AFS, HLS, PS, THERMISTOR
Verify that water flow rate is
above minimum required for
heater.
AGS or HLS "on"
Replace High Limit
Switch (HLS) or
Automatic Gas
Shutoff (AGS)
NO
YES
YES
Verify that inlet water temperature is below 104˚ F.
Service pump and filter to
restore proper flow. After servicing, verify proper operation
of Pressure Switch (PS).
NO
Replace thermistor or Control
Board to correct overheating.
CONTINUE
If problem persists, verify proper operation of Internal Bypass Valve
and Thermal Governor, and check for Heat Exchanger blockage.
PS "on"
Verify that water flow rate is
above minimum required for
heater.
NO
Does Blower operate?
YES
Service pump and filter to
restore proper flow.
CONTINUE
Verify that wiring is
YES
OK and pressure tap
CONTINUE Adjust Water Pressure Switch to close with pump running and open with
is not blocked. Replace Pressure Switch
pump off.
AFS "on"
NO
Replace Blower.
Verify that wires BM
and F1 are correctly
connected at the
terminal strip (see
Heater Connection
Diagram, Page 30).
YES
Disconnect Blower and check
for line voltage between pins
1 and 3 of Blower Connector
on ignition try.
NO
YES
NO
Check for 24 VAC between
24 VAC and GND terminals
on Ignition Control Module on
ignition try. Check that IND
wire is correctly connected.
NO
Verify correct
connection of wiring between
24 VAC and IND terminals on
Ignition Control Module and
Control Board, and replace
Control Board.
YES
Disconnect wires F1
and F2 from Ignition
Control Module and
short them together.
Does Blower come
on?
YES
THERMISTOR "on"
NO
NO
NO
Verify that there is no blockage in Blower intake, Heat
Exchanger, and exhaust and
that exhaust is not too long
(see “Indoor Vent Installation”,
Page 23.
Verify correct connection of
wiring and that pressure taps
to AFS are OK.
Verify that vinyl tubing to AFS
and Blower is not misrouted,
kinked, disconnected, or
punctured.
Replace Air Flow Switch
(AFS).
If problem persists, replace
Blower.
Connect correctly and retry.
Does Blower start?
Replace Blower. Does Blower
start on ignition try?
Replace Ignition Control
Module.
Verify Thermistor wiring. If
OK, replace Thermistor.
CAUTION Do not jumper a safety switch to
remedy a failed switch.
NOTE: ES1 is a spare and should be jumpered.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 5. Troubleshooting 43
Diagnostic LED's: SFS
SFS "on"
Check Heat Exchanger
Coil for leaks, liming, soot,
or low flow.
Heater starts and runs OK,
but temperature of exhaust
climbs to 450˚–500˚ in 3–5
minutes.
YES
YES
Check Thermal
Regulator: Open at
120˚?
NO
Heater starts after several
tries, exhaust temperature
stays below 250˚.
OR
Heater doesn’t start at all
(exhaust stays cold).
Check pressure and volume
of fuel supply
NO
YES
DONE
Check Thermal-Regulator:
Seats correctly?
NOT OK
DONE
Correct Fuel Supply, reset
Heater and retry. Heater
should fire correctly.
NO
NO
Reset power to Heater and
retry. Heater should fire.
Replace Stack Flue Sensor
DONE
NO
Reset power to Heater and
retry. Heater should fire.
Check Heat Exchanger Coil for
leaks, liming, soot, or low flow.
NO
Repeat checks on fuel
supply, Thermal Regulator,
check for correct orifices,
etc.
NO
Replace Heater Control Board.
DONE
Reset power to Heater and
retry. Heater should fire.
YES
NO
Does the Digital
Temperature Display show
Error Code “E05” or “E06”?
YES
Clean/tighten pins as
needed.
NO
NO
(Basic)
Replace Heater Membrane Pad.
DONE
Reset power to Heater and
retry. Heater should fire.
DONE
Rev. B 8/14
Replace Heater
Membrane Pad.
Replace Heater
Control Board.
Check continuity in wiring
harness between Control
YES Board and Probe.
Continuity OK?
Reset power to Heater
and retry. Heater should
fire.
NO
(HD )
NO
YES
Check the J3 and J6
connectors for corrosion/
looseness on the male
pins.
YES
Correct problem;
Heater should fire.
OK
Disconnect the sensor and
check continuity across its
terminals. Resistance
should be 3.5-4.0 megaohms.
= open circuit;
0 = shorted.
Does sensor check OK?
NO
NO
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
44
Section 5. Troubleshooting
Burner Troubleshooting
SYMPTOM
CAUSE
REMEDY
Loud, high-pitched whine
Flame is too rich.
Verify pressure tap between gas valve
and blower inlet.
See page 16 and verify that the gas
regulator setting is –0.2" (–0.5cm) wc.
Contact a qualified technician or service
agency to replace the gas orifice.
Flame is “fluttery .”
Exhaust may have acrid
smell or burner may fail
to stay lit.
Flame is too lean.
See page 16 and verify that the gas
regulator setting is –0.2" (–0.5cm) wc.
Burner pulsates or
surges, especially on
ignition.
Exhaust vent is too long.
Reduce length of exhaust vent and/or
number of elbows.
Combustion appears
normal, but flame does
not stay lit.
Flame current is not
being sensed.
Check for wet or damaged igniter with
low resistance to ground. Replacewith
new igniter.
Contact a qualified technician or service
agency to replace the gas orifice.
Verify burner flameholder is properly
grounded.
Replace Ignition Control Module.
Heat Exchanger Troubleshooting
SYMPTOM
CAUSE
REMEDY
Boiling in heat exchanger.
May be accompanied by
“bumping” sounds.
Low water flow to heater.
Service pump and or filter.
Heat exchanger plugged.
Service heat exchanger. Correct water
chemistry.
Bypass valve stuck open.
Service bypass valve.
Thermal governor stuck
closed.
Replace thermal governor.
Thermal governor failed.
Replace thermal governor.
Sweating.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 6. Maintenance 45
Maintenance Instructions
CARE AND MAINTENANCE
WARNING
Risk of ﬁre or explosion from ﬂammable vapors. Do not store gasoline, cleaning ﬂuids, varnishes, paints, or other volatile
ﬂammable liquids near heater or in the same room with heater.
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WARNING
Explosion hazard. Any heater installed with restrictive devices in the piping system downstream from the heater, (including
check valves, isolation valves, ﬂow nozzles, or therapeutic pool valving), must have a relief valve installed as described above.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
46
Section 6. Maintenance
AFTER START-UP
CHECKING WATER FLOW
WARNING
Fire or ﬂooding hazard. If the unit overheats and the burner fails to shut off, follow instructions under “To Turn Off Gas to the
Appliance”, page 33, and call a qualiﬁed service technician to repair unit.
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WINTER OPERATION
CAUTION
s /PERATINGTHISHEATERCONTINUOUSLYATWATERTEMPERATURESBELOW½F. (20° C) will cause harmful condensation and will
damage the heater and void the warranty.
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s Water trapped in the heat exchanger can result in freeze damage to the exchanger or headers. Freeze damage is speciﬁcally
not covered by the warranty.
s 7HENSTARTINGTHEHEATERFORTHESWIMMINGSEASONWITHAWATERTEMPERATUREBELOW½&½#THEHEATERMAYBEUSED to heat the water; however, make sure that the heater operates continuously until the water temperature reaches the
heater’s minimum setting of 68° F (20° C). During cold weather, if there is no danger of freezing, operate the ﬁlter pump
continuously even if the heater is not operating. If air temperatures are expected to drop below freezing (32° F/0° C), shut
down the heater and winterize it.
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WARNING
Explosion hazard. Purging the system with compressed air can cause components to explode, with risk of severe injury or death
to anyone nearby. Use only a low pressure (below 5 PSI or 35 kPa), high volume blower when air purging the heater, pump,
ﬁlter, or piping.
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NOTICE:Water trapped in the heater can cause freeze damage. Allowing the heater to freeze voids the warranty.
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(See additional notes under Important Notices in Introduction.)
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 6. Maintenance 47
MAINTAINING POOL TEMPERATURE
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CHEMICAL BALANCE
POOL AND SPA WATER
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315EHWZHHQWKHKHDWHUDQGWKHFKORULQDWRUWRSUHYHQWFRQFHQWUDWHGFKHPLFDOVIURPEDFNVLSKRQLQJLQWRWKH
KHDWHU%DFNVLSKRQLQJLVPRVWOLNHO\WRRFFXUZKHQWKHSXPSVWRSVFUHDWLQJDSUHVVXUHVXFWLRQGLIIHUHQWLDO'R127
VDQLWL]HWKHSRROE\SXWWLQJFKORULQHWDEOHWVRUVWLFNVLQWRWKHVNLPPHUV:KHQWKHSXPSLVRIIWKLVZLOOFDXVHDKLJK
FRQFHQWUDWLRQRIFKORULQHWRHQWHUWKHKHDWHUZKLFKFRXOGFDXVHFRUURVLRQGDPDJHWRWKHKHDWH[FKDQJHU
7KUHH PDMRU LWHPV WKDW FDQ FDXVH SUREOHPV ZLWK \RXU SRRO KHDWHU DUH LPSURSHU S+ GLVLQIHFWDQW UHVLGXDO DQG WRWDO
DONDOLQLW\7KHVHLWHPVLIQRWNHSWSURSHUO\EDODQFHGFDQVKRUWHQWKHOLIHRIWKHKHDWHUDQGFDXVHSHUPDQHQWGDPDJH
CAUTION
Heat exchanger damage resulting from chemical imbalance is not covered by the warranty.
WHAT A DISINFECTANT DOES
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FRQWURO
WHAT IS A DISINFECTANT RESIDUAL?
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EURPLQHUHVLGXDO<RXFDQGHWHUPLQHWKHGLVLQIHFWDQWUHVLGXDORI\RXUSRROZDWHUZLWKDUHOLDEOHWHVWNLWDYDLODEOHIURP
\RXUORFDOSRROVXSSO\VWRUH
<RXPXVWPDLQWDLQDGLVLQIHFWDQWUHVLGXDOOHYHODGHTXDWHHQRXJKWRDVVXUHDFRQWLQXRXVNLOORIEDFWHULDRUYLUXVLQWURGXFHG
LQWRSRROZDWHUE\VZLPPHUVWKURXJKWKHDLUIURPGXVWUDLQRURWKHUVRXUFHV
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
48 Section 6.
Maintenance
CHEMICAL BALANCE (continued)
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pH7KHWHUPS+UHIHUVWRWKHDFLGDONDOLQHEDODQFHRIZDWHUH[SUHVVHGRQDQXPHULFDOVFDOHIURPWR$WHVWNLWIRUPHDVXULQJ
S+EDODQFHRI\RXUSRROZDWHULVDYDLODEOHIURP\RXUORFDOSRROVXSSO\VWRUHVHH7DEOH
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58/(WRLVDGHVLUDEOHS+UDQJH,WLVHVVHQWLDOWRPDLQWDLQFRUUHFWS+VHH7DEOH
If pH becomes too high (over alkaline), it has these effects:
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)LOWHUHOHPHQWVPD\EHFRPHEORFNHG
)FP(ISTOOLOWOVERACIDTHEFOLLOWINGCONDITIONSMAYOCCUR
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(WFKLQJRIWKHSODVWHU
&RUURVLRQRIPHWDO¿[WXUHVLQWKH¿OWUDWLRQDQGUHFLUFXODWLRQV\VWHPZKLFKPD\FUHDWHEURZQEOXHJUHHQRUVRPHWLPHVDOPRVW
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,I\RXKDYHDVDQGDQGJUDYHO¿OWHUWKHDOXPXVHGDVD¿OWHUDLGPD\GLVVROYHDQGSDVVWKURXJKWKH¿OWHU
CAUTION: Do not test for pH when the chlorine residual is 3.0 ppm or higher, or bromine residual is
6.0 ppm or higher. See your local pool supply store for help in properly balancing your water chemistry.
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³7RWDODONDOLQLW\´LVDPHDVXUHPHQWRIWKHWRWDODPRXQWRIDONDOLQHFKHPLFDOVLQWKHZDWHUDQGFRQWUROS+WRDJUHDWGHJUHH,WLV
QRWWKHVDPHDVS+ZKLFKUHIHUVPHUHO\WRWKHUHODWLYHDONDOLQLW\DFLGLW\EDODQFH<RXUSRROZDWHU¶VWRWDODONDOLQLW\VKRXOGEH
SSPWRSHUPLWHDVLHUS+FRQWURO
$WRWDODONDOLQLW\WHVWLVVLPSOHWRSHUIRUPZLWKDUHOLDEOHWHVWNLW<RXZLOOQHHGWRWHVWDERXWRQFHDZHHNDQGPDNHSURSHUDGMXVWPHQWV
XQWLODONDOLQLW\LVLQWKHSURSHUUDQJH7KHQWHVWRQO\RQFHHYHU\PRQWKRUVRWREHVXUHLWLVEHLQJPDLQWDLQHG6HH\RXUORFDOSRRO
GHDOHUIRUKHOSLQSURSHUO\EDODQFLQJWKHZDWHUFKHPLVWU\
WATER CHEMISTRY PARAMETERS
Disinfectant levels
Minimum
Ideal
Maximum
Free Chlorine, ppm
1.0
2.0-4.0
5.0**
Combined Chlorine, ppm
None
None
0.2
Bromine, ppm
2.0
4-6
10.0
Other Sanitizers
Levels not established. Consult local health department before use.
Chemical Values
pH
7.2
7.4-7.6
7.8**
Total Alkalinity (Buffering), ppm
60
80-100
180
as CaCO3
Salt ppm
2000
3200
5000**
Total Dissolved Solids, ppm
N/A
N/A
1,500 ppm > TDS at startup*
Calcium Hardness, ppm, as CaCO3
150
200-400
500-1,000
Heavy Metals
None
None
None
Biological Values
Algae
None
None
None
Bacteria
None
None
Refer to Local Code
*Start-up TDS includes source water TDS and any other inorganic salt added at start-up.
Table 7.
NOTE (**): Failure to adhere to the listed water chemistry parameters may result in premature failure of the heat exchanger and will
VOIDTHEWARRANTY.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 6. Maintenance/Replacement Parts 49
MasterTemp® 125 HEATER REPLACEMENT PARTS
1
For complete
Electrical System
parts breakdown
(Key Nos. 1 through 4),
See Page 53
For complete
Burner System
parts breakdown
(Key Nos. 5 through 7),
See Page 51
2
7
5
6
3
9
4
8
For complete
Water System
parts breakdown
(Key Nos. 8 through 9),
see Page 52
Repair Parts are available from your Pentair dealer.
If your dealer cannot supply you, call Customer Support at 1-800-831-7133.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
50 Section 6. Maintenance/Replacement Parts
MasterTemp® 125 HEATER REPLACEMENT PARTS
22
1
8
9
2
21
10
3
4
7
11
6
5
12
14
20
19
18
26
27
13
23
17
16
15
24
23
25
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 6. Maintenance/Replacement Parts 51
MASTERTEMP® 125 HEATER REPLACEMENT PARTS
REPAIR PARTS – BURNER SYSTEM
Model
Key
Part
No.
Description
Qty.
MT125 NA
MT125 LP
1
Combination Gas Control Valve Kit
1
42001-0051S
2
3/4" Union
2
38404-4097S
3
Gas Orifice
1
4
Gas Orifice O-Ring
1
F
as Orifice Kit – NG (Incl. Key Nos. 3 and 4)†
474981
F
as Orifice Kit – Propane (Incl. Key Nos. 3 and 4)†
474980
F
"G to Propane Conversion Kit
F
$ropane to NG Conversion Kit
461063
(Incl. Key Nos. 3 and 4)†
461062
(Incl. Key Nos. 3 and 4)†
5
Air Blower Kit
Natural Gas Units
1
474978
Propane Units
1
474977
474979
F
ir Orifice Kit (Includes Key Nos. 6 and 7)
1
6
Air Orifice Kit
1
7
Air Orifice Grill
F
lower/Adapter Plate Gasket Kit
(Includes Key Nos. 8, 9, 10, 12)
F
1
77707-0011
1
474994
lameholder Kit (Includes
Key Nos. 10, 11, 12, 13)
8
Blower/Adapter Plate Gasket
1
9
Blower Adapter Plate
1
10
5+6/285./:
.+9</:Plate Gasket
1
11
5+6/285./:Assembly
1
12
5+6/285./:
86,=;<387Chamber Gasket*
1
13
5+6/285./: Insulation Cap
1
F
lameholder Insert
1
14
Combustion Chamber Gasket Kit
1
474952
15
One Piece Metal Chamber/Combustion Chamber
Assembly (9-bolt)
1
474990
F
nsulation Kit (Includes Key No. 13, 16,17,18,19)
1
77707-0008
16
Bottom Outer Insulation Blanket*
1
17
1" Bottom Inner Insulation
1
18
1" Top Insulation
1
19
Top Outer Insulation Blanket*
1
F
Lower Enclosure Insulation
1
42001-0074S
20
One Piece Metal Elbow/Combustion Chamber
Cover Assembly (9-bolt)
1
474958
Metal Vent Cover
1
42002-0005S
22
Heater Top
1
42002-0034Z
23
Side Panel {Service Panel}
1
474991
21
24
Side Panel {Manifold}
1
25
Heater Bottom
1
26
&3./$+7/5B5=/&<+-4C
1
27
J-Box Cover
1
28
F
Screws/Clips Kit, Panel (8 ea. clips & 8 ea. screws)
Combustion Air Intake Duct Connection Kit
1
1
*
474992
42002-0031Z
474993
42002-0041Z
474292
CALL
Not available separately.
** Not included with heater. Order separately.
Rev. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
52 Section 6. Maintenance/Replacement Parts
MASTERTEMP® 125 HEATER REPLACEMENT PARTS
1
3
4
2
5
12
6
13
8
14
9
7
10
11
REPAIR PARTS – WATER SYSTEM
Model
Key
No.
Part
Description
1
Tube Sheet Coil Assembly Kit (NA, LP)
(Includes Key No.3)
2
M anifold Kit (Includes Key Nos. 3-11. Key No.12 and 13 not included.
Key Nos. 5-7 in “Electrical System”, Page 53
3
4
5
Coil/Tubesheet Sealing O-Ring Kit
Manifold Bottom Plate (*)
6
7
8
9
10
11
Manifold O-Ring (*)
Manifold Baffle Plate (*)
M anifold Bypass Valve (*)
Water Pressure Switch
Manifold (*)
5/16" Washer, Stainless Steel (*)
5/16x18x2-3/4" Hex Cap screw (*)
12
Thermal Regulator
13
Pressure Relief Valve (Recommended
(Purchase Separately)
14
1-1/2” Union Kit
Qty.
MT125 NA
MT125 LP
1
474971
1
1
1
1
1
1
1
1
6
6
1
1
1
474972
474973
42001-0060S
474989
473715Z
474974
(*) Not available separately
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14
Section 6. Maintenance/Replacement Parts 53
MASTERTEMP® 125 HEATER REPLACEMENT PARTS
1
15
14
13
2
3
16
4
11
10
6
5
7
12
8
7a
9
REPAIR PARTS – ELECTRICAL SYSTEM
Key
No.
Rev. B 8/14
Qty.
Model 125 (NA/LP)
1
Heater Display Cover
1
42002-0035
2
Igniter Bracket
1
42001-0030S
3
Igniter/Igniter Gasket Kit Incl. Key Nos. 3 and 4)
1
77707-0054
4
Igniter Gasket
1
42001-0066S
5
Automatic Gas Shutoff Switch (AGS)
1
474368S
6
High Limit Switch
1
474367S
7
7a
Thermistor
Hi-Limit Switch 45° C
1
1
42001-0053S
8
Terminal Board
1
42001-0056S
9
Fireman’s Switch Fuse (1.25A, 1-1/4")
1
32850-0099
10
Ignition Control Module
1
42001-0052S
11
Transformer, 120/240V
1
42001-0107S
MT125 HD NA & LP
(International)
474369S 55° C HI LIMIT
175147S
474103S
12
Air Flow Switch
1
42001-0061S
13
Control Board Kit (NA, LP Series)
1
42002-0007S
=
Heater Wiring Harness - 120/240V
1
42001-0104S
474163S
=
120/240 Volt Plug Kit
1
42001-0105S
473764S (240 V PLUG)
Heater, Top
1
42002-0034Z
14
=
Part
Description
15
Membrane Pad (NA, LP Series)
1
472610Z
16
Stack Flue Sensor
1
42002-0024S
ot available separately.
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
56
+$:.,16$9(6$1)25'1&ɒ
:(67/26$1*(/(6$9(02253$5.&$ɒ
www.pentairpool.com
All Pentair trademarks and logos are owned by Pentair or by one of its global affilliates. Pentair Aquatic Systems™, MasterTemp®, IntelliTouch®, EasyTouch®, are trademarks and/or registered trademarks of Pentair Water Pool and Spa, Inc. and/or its affiliated companies
in the United States and/ or other countries. Unless expressly noted, names and brands of third parties that may be used in this document
are not used to indicate an affiliation or endorsement between the owners of these names and brands and Pentair Water Pool and Spa, Inc.
Those names and brands may be the trademarks or registered trademarks of those third parties. Because we are continuously improving
our products and services, Pentair reserves the right to change specifications without prior notice. Pentair is an equal opportunity employer.
© 2014 Pentair Water Pool and Spa, Inc. All rights reserved. This document is subject to change without notice.
P/N 475000 REV. B 8/14
MASTERTEMP® 125 Pool and Spa Heater Installation and User’s Guide
Rev. B 8/14

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