Download SRH3 - In Duct Diagnostic Psychrometer

Fieldpiece
Quick Start
In-Duct
Problem-Solving
Psychrometer
OPERATOR'S
MANUAL
Model SRH3
80
Certifications
PRESS FOR
1 SECOND
AUTO-OFF
ON/OFF
RH/DP/WB
BATTERY
CHECK
PRESS 1 SEC
TO CLEAR
UNITS
MAX/MIN/H
ENTER
OUTPUT
Description
1. Power on your SRH3 by holding the
ON/OFF button for 1 second.
2. Use the TSH/TEET/NORM button to
select NORMAL mode.
3. Press the RH/DP/WB button to cycle
between relative humidity, dew
point, and wet bulb temperatures.
4. The air temperature will always be
shown in the lower display and the
relative humidity, dew point, or wet
bulb measurement will be displayed
in the upper display in real-time.
5. Insert sensor probe into duct for
in-duct measurements.
C-Tick (N22675)
CE
TSH/TEET/NORM
In-Duct
Diagnostic
Psychrometer
WEEE
RoHS Compliant
SRH3
01
02
plenum placement of probe. Insert SRH3 probe into
the plenum to take the wet bulb measurement.
Press ENTER to lock in the reading.
3. Take a dry bulb (air temperature) measurement
going into the condensor. Press ENTER to lock in
the reading.
4. Press OUTPUT to calculate the target superheat.
Compare the target superheat to the actual
superheat of the system.
5. Seal any holes before leaving the jobsite.
How to Use
Normal Mode
Normal mode allows you quickly
and easily take real-time dry bulb, wet
bulb, dew point, and relative humidity
measurements.
1. Press TSH/TEET/NORM button until NORM is
displayed in lower left corner.
2. For upper display measurements, press the RH/DP/
WB button to toggle relative humidity, dew point,
or wet bulb temperature measurements.
Note: Dry bulb (air temperature) will always show in
the lower display.
Perform a simple Target Superheat
test to determine what the superheat
should be on a fixed restrictor system.
Use the target superheat to compare
to the actual superheat to determine
if a system is properly charged.
07
08
1. Press the TSH/TEET/NORM button until TEET is
displayed in the lower left of the LCD.
2. Take a wet bulb measurement inside the return
plenum. Drill or punch a 3/8" hole into the return
plenum. See Figure 1 for recommended return
plenum placement of probe. Insert SRH3 probe into
the plenum to take the wet bulb measurement.
Press ENTER to lock in the reading.
1. Press the backlight button to toggle the backlight
on/off at any time during the SRH3's use.
Note: The back light will automatically shut off after 1
minute to conserve battery life.
Maximum/Minimum/Hold
1. Pressing the MAX/MIN/H button activates the
Max-Min-Hold function, holding the maximum and
minimum measured values until cleared.
2. Once the Max-Min-Hold function has been
enabled, pressing MAX/MIN/H cycles between
displaying maximum (MAX), minimum (MIN) and
freezing the current value.
80
3. Press and hold the MAX/MIN/H button for 2 seconds
to erases all stored maximum and minimum values
and return to real-time measurements.
BATTERY
CHECK
PRESS 1 SEC
TO CLEAR
Units
1. Press the units button to switch between degrees
Fahrenheit and Celsius.
Battery Check
1. Press and hold the UNIT button for 2 seconds to
80
80display the battery life in percentage.
80
Output
1. Press the OUTPUT button to perform calculations
of Target Superheat and Target Evaporator Exit
Temperature after necessary measurements have
been entered.
ON/OFF
04
HOLD
HOLD
AVERAGE
AVERAGE
UNITS
UNITS
Use the RCONE1 to lock your sensor
probe in place inside the duct. Using
the RCONE1 and magnet on the SRH3
DUCT
allows you hands-free in-duct testing.
See Figure 2.
DUCT
WARNING
Do not retract the sensor probe by pulling on the cord.
Doing so may sever the cord from the sensors.
09
Backlight
Toggle Backlight. (Hold while powering
80
your SRH3 on to disable APO.)
Auto Power Off Enabled
Low Battery Indicator
Relative Humidity
Dew Point
Wet Bulb Toggles to display Maximum, Minimum, Dry Bulb
MAX/MIN/
H or Hold the current reading. Hold for 1 %Relative Humidity
second to exit and clear stored values.
Outdoor
ENTER Confirm Selection
Indoor
Target Superheat
Outputs calculations for Target Target Evaporator Exit Tem-
Superheat or Target Evaporator Exit OUTPUT
perature
Temperature
Normal Range
Toggle to80
enter Target Superheat, Temperature (Fahrenheit) PRESS FOR
TSH/TEET/NORM
Target
Evaporator
Exit Temp, or AUTO-OFF
Temperature (Celsius) 1 SECOND
Normal
modes.
80
Hold Display
Maximum Display
Minimum Display
ON/OFF
RCONE1 Probe Lock
Functions
Toggle display to show relative RH/DP/WB
humidiy, dew point and wet
bulb temperatures
Toggle between Fahrenheit and Celcius. Hold for 2 seconds to display battery UNITS
percentage.
ON/OFF
Target Evaporator Exit Temperature
( TEET ), aka temperature drop or
delta T, is used to determine if the
evaporator is getting the optimum
airflow. A TEET test can be quickly
per formed by taking two easy
temperature measurements at the
return side of the evaporator.
Controls
ON/OFF Hold 1 second to toggle power on/off.
3. Take a dry bulb measurement at the same place the
previous wet bulb measurement was taken. Press
PRESS FOR
ENTER to lock in the reading.
AUTO-OFF
1 SECOND
4. Press OUTPUT to calculate the target evaporator
exit FOR
PRESS
AUTO-OFF
temperature.
Compare this calculated target to1theSECOND
actual evaporator exit temperature.
5. Take a dry bulb measurement inside the supply
plenum to check the actual Evaporator Exit
Temperature. See Figure 1 for recommended supply
plenum placement of probe. Drill or punch a 3/8"
hole into the supply plenum. Press TSH/TEET/NORM
RECORDSRH3
MODE
until NORM is displayed.Insert
probe into
MODE
the plenum and read RECORD
the temperature
in the lower
display.
6. Seal any holes before leaving the jobsite.
Note: For both Target Superheat and Target Evaporator
Exit Temperature modes, you can adjust any
temperature measurement after calculations have
been performed by pressing ENTER. This prompts
you to re-take the measurements.
Target Evaporator Exit
Temperature Mode
Target Superheat Mode
1. Press TSH/TEET/NORM button until TSH is displayed
in the lower left of the LCD.
2. Take a wet bulb measurement at the inlet of the
evaporator. Generally right before the filter is a
good location. Drill or punch a 3/8" hole into the
return plenum for a measurment depth of up to
24 inches. See Figure 1 for recommended return
03
Display
With your purchase of the SRH3 you
now have the ability to take supply/
return temperature, %RH, wet bulb
and dew point measurements from
inside the duct or plenum.
Your SRH3 is a portable, hand held,
diagnostic psychrometer, designed
for the HVAC/R technician.
SRH3 helps you properly charge
a fixed restrictor system by quickly
determining the Target Superheat
( TSH). Your SRH3 can also help
determine optimum airflow across
the evaporator by easily performing
a Target Evaporator Exit Temperature
(TEET) test.
The 38"(96cm) telescoping probe
with laser etched ruling and flattened
edges allows you to locate proper
measurement points within a duct and
ensures that your probe is properly
aligned.
The dual display with a bright
backlight, rugged rubber boot with
probe clips, make sure the SRH3 is
ready for any job.
ENTER10
ENTER
05
PRESS FOR
PRESS
FOR
PRESS
FOR
1 SECOND
SECOND
11 SECOND
RECORD MODE
AUTO-OFF
AUTO-OFF
AUTO-OFF
Figure 1
ON/OFF
ON/OFF
ON/OFF
HOLD
AVERAGE
RECORD MODE
RECORD MODE
Recommended Hole
Placement for Supply
Plenum Measurements
HOLD
HOLD
AVERAGE
AVERAGE
06
Specifications
Relative Humidity:
Telescoping Probe Length: Up to 38 inches (97cm)
Probe Tip Diameter: 0.35 inch (9mm)
Storage temperature: -4°F to 140°F (-20°C to 60°C), 0
to 80% RH (with battery removed)
Temperature Coefficient: 0.1 x (specified accuracy)/°C
(<18°C or >28°C)
Over range: "OL" or "-OL" is displayed
Power: Single standard 9-volt battery, NEDA 1604, JIS
006P, IEC 6F22
UNITS
Auto Power off: after 15 minutes of inactivity if APO
is active.
Battery life: 150 hours typical (alkaline)
Low Battery Indication:
is displayed when the
battery voltage drops below the operating level.
Dimensions: 7.9 in (H) x 2.6 in (W) x 1.4 in (D),
[200mm (H) x 66mm (W) x 36mm (D)]
Weight: Approx. 400g, including battery
Sensor Type: Capacitance polymer film
Operating environment: 32°F to 131°F (0°C to 55°C)
Range: 0% to 100%RH
Accuracy: ±(2.5%) 10% to 90%RH
±(5%) <10%RH and >90%RH
Note: Above accuracies stated at 73.4°F (23°C).
Sensor Response Time: 60 seconds typical for 90% of
total range.
Sensor Hystersis: ±1%RH typical (Excursion of 10% to
90% to 10%RH)
Figure 2
DUCT
UNITS
UNITS
UNITS
DUCT
DUCT
DUCT
Temperature:
ENTERSensor type: Precision thermistor
ENTER
ENTER
ENTER
Operating environment: -4°F to 140°F (-20°C to 60°C)
Range: -4°F to 140°F (-20°C to 60°C)
Resolution: 0.1°F / 0.1°C
Accuracy: ±(1°F) 32°F to 113°F
±(2°F) -4°F to 32°F, 113°F to 140°F
±(0.5°C) 0°C to 45°C
±(1°C) -20°C to 0°C, 45°C to 60°C
Recommended
Hole Placement for
CLEAR DATA
CLEAR
Return Plenum
CLEARDATA
DATA
CLEAR DATA
Measurement is
directly before the
evaporator coil. Look behind
the panel before drilling and make
sure you do NOT drill a hole through any critical HVAC components.
MAX/MIN
MAX/MIN
MAX/MIN
MAX/MIN
11
AUTO-OFF
PRESS FOR
1 SECOND
ON/OFF
RH/DP/WB
BATTERY
CHECK
Use the RCONE1 for
hands-free in-duct
measuremesnts.
12
PRESS 1 SEC
TO CLEAR
UNITS
MAX/MIN/H
ENTER
OUTPUT
TSH/TEET/NORM
In-Duct
Diagnostic
Psychrometer
SRH3
A/C Basics
Low Pre
ssu
r
THROTTLE
VALVE
ide
eS
I n t h e U S A , c a l l Fi e l d p i e c e
Instruments for one-price-fix-all out of
warranty service pricing. Send check or
money order for the amount quoted.
Send the meter freight prepaid to
Fieldpiece Instruments. Send proof
of date and location of purchase for
in-warranty service. The meter will be
repaired or replaced, at the option of
Fieldpiece, and returned via least cost
transportation. Outside of the USA,
please visit www.fieldpiece.com for
service contact information.
REFRIGERANT
FLOW
Pr
COMPRESSOR
es
sure
Side
OUTDOOR AIR
HOT AIR
CONDENSER
15
16
Wireless Solutions
from Fieldpiece
ET2W
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with ACH4
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CAT.III
AC Current
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AC Cur rent
Clamp
ET2W w/ ARH4
transmitting wirelessly
to EH4W
!
1AAC / 1mVAC
400AAC MAX
1AAC / 1mVA
C
400AAC MAX
ACH4
ACH4
ET2W
AUTO OFF
ET2W
AUTO OFF
SEND
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RECEIVE
SEND
ET2W
AC
DC
SYNC
ON
SEND
Wireless
Transmitter
SYNC
LO BATT
RECEIVE
TO
CONNECT ONLY
HEAD!
ACCESSORY
ON
Wireless
Transmitter
PRESS FOR
INPUT FORM
SET 01
Set ID:Indoor Temp 72.8
Measurement:
SET 02
SET ID:Comp Amps 23.6
Measurement:
CustomerID:__JONES123
RECEIVE
DC
Wireless
Transmitter
CheckMe!
SYNC
RECEIVE
Combustion
AC
Cle
SEND ONLY
ar
CAL
Service
Light
Combustion
Cle
ar
LO BATT
Subcooling
Recall
FUSED
ve
Sa
15 SEC FOR 500mV
RANGE
CAT.III
MAX
600V
FUSED
200mA
MAX
ve
Recall
Sa
LT17AW w/ Built-in Wireless
Fieldpiece HG3
21
22
23
24
Enter
Units
T1 T2 Direct
Fieldpiece HG3
Superheat
Target
Superheat
Alarm
30V
MAX
Subcooling
Superheat
Subcooling
T2
ON/OFF
Refrigerant
HVAC Guide
Display
Data
Logger
APO
AUTO
OFF
Display
EH4W
CheckMe!
°F°C
SCT2
LSAT
ODDB
HH:MM:SS
Digital Manifold + Vacuum Gauge
T1
SETUP
CFM
°F°C
SHT1
VSAT
IDWB
°F°C
RMicrons
Target SH
StableSet
Alarm
HiLo
Enter
Target
Evaporator
Exit Temp
Psig
Kpa
inHg
cmHg
Saturation
CAL
CAL
Atmospheric
Pressure
Test
Pressure
ON
Wireless
Transmitter
Superheat
HVAC Guide
20
Psig
Kpa
inHg
cmHg
50
5000m
500m
500µ
50m
200m
500
750
500
1400
200m
2K
200
20 20M
2K
200K 200
SETUP
AC
DC
SEND
Service
Light
1 SEC TO EXIT
600500
500µ
50m
Data
Logger
LO BATT
HOLD
500600
RECV
LO BATT
Target
Evaporator
Exit Temp
Output
Sync
Enter
CFM
SYNC
Input
50
5000m
500m
ET2W
ON
WIRELESS
ENABLED
SYNC
ON
LO BATT
AUTO-OFF
www.fieldpiece.com
AUTO-OFF
MAX/MIN
AC
DC
SEND
SMAN3 is the most advanced digital
manifold w/ micron gauge on the
market. Check it out.
SMAN3
Wireless
Transmitter
RECEIVE
ET2W
MAX 30VDC
24VAC
18
SMAN3 Digital
Manifold w/
Micron Gauge
Output
Sync
LO BATT
AC
DC
HG3 Multi-Channel
Wireless Receiver
data logging
multiple readings at
the same time
17
INPUT FORM
SET 01
Set ID:Indoor Temp
Measurement:
72.8
SET 02
SET ID:Comp Amps
Measurement:
23.6
CustomerID:__JONES123
ON
ET2W
SEND
Your SRH3 powers off automatically
after approximately 15 minutes to
lengthen battery life. To disable
"Auto Off," hold the
button while
powering on your SRH3. When
disabled, APO will not display in upper
left of LCD.
!
Input
ARH4
SYNC
Auto Power Off
AC
DC
AC
DC
ARH4
SYNC
19
300V
400A
ET2W
with ACM3
This meter is warranted against
defects in material or workmanship
for one year from date of purchase.
Fieldpiece will replace or repair the
defective unit, at its option, subject
to verification of the defect.
This warranty does not apply
to defects resulting from abuse,
neglect, accident, unauthorized
repair, alteration, or unreasonable use
of the instrument.
Any implied warranties arising
from the sale of a Fieldpiece product,
including but not limited to implied
warranties of merchantability and
fitness for a particular purpose, are
limited to the above. Fieldpiece shall
not be liable for loss of use of the
instrument or other incidental or
consequential damages, expenses, or
economic loss, or for any claim of such
damage, expenses, or economic loss.
S t a te l aws v a r y. Th e a b ove
limitations or exclusions may not
apply to you.
HG3 w/ MultiChannel
Wireless
CLAMP
300V
400A
CAT.III
RECEIVE
© Fieldpiece Instruments, Inc 2011; v05
Sensor Care
When not in use it is best to protect
this sensors with the vinyl slip cover
included with the SRH3.
Extreme conditions or exposure to
solvent vapors may offset the RH%
sensor. If this happens, place the
sensor in a controlled envrionment of
75%RH and between 68°F - 86°F for a
period of 24 hours.
To create a 75%RH environment
moisten a small amout of table salt,
in an open container such as a clean
2 liter bottle cap.
Place the container with the salt
solution and the SRH3 probe in a
sealable plastic bag, and leave the bag
in a room temperature location where
it will not be disturbed for 24 hours.
Note: It is important that the salt
solution does not come in direct
contact with the sensor, as this may
permenantly damage the sensor.
Limited Warranty
the meter displays
the battery
should be replaced. Turn your SRH3
off and replace with 9V battery.
Clean the exterior with a dry cloth.
Do not use liquid.
SUPPLY AIR
h
For Service
14
The highly superheated gas enters
the condenser and rejects heat
into the outside air. The refrigerant
RETURN AIR
Battery ReplacementWhen
Maintenance
EVAPORATOR
Hig
13
Th e Eva p o rato r, Co n d e n s e r,
Restrictor ( Throttling valve) and
Compressor are the four basic
components of an air conditioner.
Following one pound of refrigerant
through the system shows the
function of each component.
Subcooled liquid refrigerant at high
pressure enters the restrictor and is
throttled to saturated refrigerant at a
lower pressure. The restrictor can be
of either a fixed or TXV/EXV type. The
fixed type must be charged to a target
superheat that varies with indoor and
outdoor conditions. TXV/EXV systems
must be charged to subcooling.
The evaporator capacity varies
with the indoor heat load on a fixed
restrictor. The TXV/EXV regulates the
size of the restriction to maintain a
constant superheat. This essentially
adjusts the capacity of the evaporator
responding to the indoor heat load.
After the restrictor, refrigerant enters
the evaporator at a low temperature
and pressure and boils (evaporates)
condenses back into a liquid. Once
all of the gas is condensed into a
liquid, additional removal of heat
causes a temperature drop that
is known as subcooling. TXV/EXV
systems are charged to subcooling
since superheat is controlled by
the throttle valve. Subcooling
measurements are taken on the
liquid line between the condenser
and TXV/EXV. Finally, the subcooled
liquid enters the restrictor and the
cycle starts again.
into a gas by absorbing heat from the
indoor air. The refrigerant stays at the
same temperature and pressure until
all the refrigerant evaporates into a
gas. After the refrigerant becomes a
gas, it will continue to absorb heat
and become superheated at which
point its temperature will change. The
Superheat measurement is the best
indication of refrigerant charge level
in a fixed restrictor system. A TXV/
EXV system will keep the superheat
constant. There must be superheat
present to ensure liquid does not
flood the compressor.
Superheat measurements are taken
on the suction line between the
evaporator and compressor.
The compressor takes this low
temperature, low pressure, slightly
superheated refrigerant and
compresses it to a much higher
temperature and pressure.
CAL