Download Honeywell H8908B Humidistat User's Manual

H8908B Humidistat
H8908C Dehumidistat
INSTALLATION INSTRUCTIONS
APPLICATION
The H8908B Humidistat and H8908C Dehumidistat
(humidity controllers) provide automatic low voltage
control of humidifiers and dehumidifiers or ventilators,
respectively, in central heating and air conditioning systems. They have a spst, snap-acting, dust-proof switch
and are designed for wall or surface duct mounting.
Humidity Control
Régulateur d'humidité
OUTDOOR
TEMPERATURE
-20 °F
-30 °C
-10 °F
-25 °C
0 °F
-20 °C
+10 °F
-10 °C
+20 °F
-5 °C
Over 20 °F
Over 0 °C
HUMIDITY
SETTING
15%
20%
25%
30%
35%
40%
INSTALLATION
When Installing this Product...
1.
2.
3.
4.
Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
Check the ratings given in the instructions and on
the product to make sure the product is suitable
for your application.
Installer must be a trained, experienced service
technician.
After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Personal Injury Hazard.
Power supply can cause electrical shock.
Disconnect power supply before beginning
installation.
Location and Mounting
HOLE FOR WIRING
THE DUCT MOUNTING
INSTALLATIONS
Wall Mounting
IMPORTANT
Mount the control in an area with average
room temperature and average relative
humidity.
The following mounting instructions are for mounting
the H8908 on the wall next to the T8600. When installing the H8908 at another location, modify the procedure
to fit the installation.
1.
NOTE: The H8908 electrical connections are not
shared with the thermostat.
3.
4.
2.
5.
•All Rights Reserved
M13371
Fig. 1. H8908B Humidistat.
The styling of the H8908 is designed to blend with the
latest T8600 family of Honeywell Chronotherm® IV
Deluxe Programmable Thermostats. A mounting template is included for mounting the H8908 next to the
T8600. The H8908 can also be mounted at any other
convenient location in the living area or equipment
room. See Fig 1.
® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. •
CASE REMOVAL
SLOT
Hold the mounting template (included) next to the
T8600. Select the mounting side for the H8908.
The template is reversible for mounting on either
the left or right side of the T8600. See Fig. 2.
Mark the holes for the two mounting screws
(included). Then mark the hole for the low voltage
wiring on the template that corresponds with the
side selected in step 1.
Remove the template and drill the holes.
Run low voltage wiring to the location and pull
about 6 in. (152 mm) of wire through the hole.
Plug the hole with nonflammable insulation to
prevent drafts from affecting the control operation.
69- 1341
H8908B HUMIDISTAT H8908C DEHUMIDISTAT
6.
7.
8.
Remove the H8908 case from the base. See
Fig. 1.
Position the base on the wall with the arrow up.
Use the two 1 in. (25 mm) mounting screws to
secure the base to the wall.
THERMOSTAT
WALLPLATE
ALTERNATE LOCATION
RETURN
AIR
MOUNTING
TEMPLATE
RETURN
AIR
6 in. (152 mm)
MINIMUM
15 in. (381 mm)
MINIMUM
BEST
LOCATION
RETURN AIR DUCT
M13369
MOUNTING
HOLES (2)
WIRING HOLES FOR MOUNTING ON RIGHT.
USE LEFT HOLES FOR MOUNTING ON LEFT.
Fig. 3. Selecting duct location for control.
M13370
1.
Fig. 2. Positioning mounting template.
IMPORTANT
Use 18- to 22-gauge wire for proper wiring.
2.
3.
Connect the low voltage wires to the leads on the
H8908.
10. Replace the H8908 case.
9.
4.
5.
6.
7.
Duct Mounting
IMPORTANT
When mounting near an elbow area, locate the
control 6 in. (152 mm) upstream from the
elbow so the element is exposed to the normal
airflow (Fig. 3).
8.
9.
Locate the control at least 8 in. (203 mm)
upstream from the humidifier (or dehumidifier/
ventilator supply) in the return air duct. See Fig. 3.
Apply the duct template to the duct location.
Use the duct template, Fig. 4, to make the opening and mounting holes for the H8908.
Remove the H8908 case from the base. See
Fig. 1.
Position the foam gasket on the H8908 base.
Position the base on the duct with the arrow up.
Use the four 1 in. (25 mm) mounting screws to
secure the base to the duct.
Connect the low voltage wires to the leads on the
H8908.
Replace the H8908 case.
IMPORTANT
Use 18- to 22-gauge wire for proper wiring.
4X DRILL 7/64 IN. DIAMETER
PERCER 4 X 7/64 PO.
DUCT TEMPLATE
GABARIT DE GAINE
CAUTION
Equipment Damage Hazard.
Be careful when selecting control
location and cutting hole in ductwork.
Do not cut or drill into air conditioning
or electrical accessories.
Do not install control on supply (hot air) ductwork.
To use template:
1. Remove backing and apply template to duct.
2. Cut along template dotted line and drill the
mounting holes.
MISE EN GARDE
Risque d'endommager le matériel.
Faire attention au moment de choisir
l'emplacement du régulateur et de percer les
trous dans la gaine.
Ne pas couper ou percer les accessoires
électriques ou de climatisation.
Ne pas installer le régulateur sur la gaine
d'alimentation (air chaud).
Utilisation du gabarit:
1. Retirer l'endos du gabarit et placer le gabarit
sur la gaine.
2. Couper le long de la ligne pointillée du gabarit
et percer les trous de fixation.
M13373
Fig. 4. Positioning return air duct template.
69-1341
2
H8908B HUMIDISTAT H8908C DEHUMIDISTAT
WIRING
H8908B
WATER
SOLENOID
LEAD WIRE
2
CAUTION
TRANSFORMER
Personal Injury Hazard.
Power supply can cause electrical shock and
injury.
Disconnect power supply before installation or
servicing.
L2
L1 1
(HOT)
CURRENT
LO
SENSING
RELAY
C
HI
All wiring must comply with applicable local codes, ordinances and regulations. Make wiring connections
according to humidifier (or dehumidifier/ventilator)
instructions, if available; otherwise, see typical wiring
diagrams in Fig. 5 through 12.
HUMIDIFIER
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 24V WIRING.
IMPORTANT
Select models of fan centers include humidifer
taps so the current sensing relay or sail switch
is not needed.
M13386
Fig. 7. Typical wiring diagram of current
sensing relay with humidifier.
SAIL
SWITCH
H8908B
If not using a current sensing relay or sail
switch, the humidifier must be energized during blower motor cycles for proper operation.
2
TRANSFORMER
On multispeed blower applications, do not wire
the high voltage side of the transformer to the
same power source that services the furnace
blower. Premature transformer burnout can
occur.
1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
2 24V WIRING.
On HE360 fan powered humidifier models,
only the two yellow wires are connected to the
control. The remaining two red wires are only
used with electronic humidity controls.
FAN WIRING
TERMINALS
1
1
FAN CONTROL
1
FURNACE
FAN
MOTOR
HUMIDISTAT
TERMINALS
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2
24 VAC WIRING.
M13368
NOTE: FOLLOW THE INSTALLATION INSTRUCTIONS
INCLUDED WITH THE STEAM HUMIDIFIER
TO WIRE THE SYSTEM FAN.
M13387
Fig. 9. Typical wiring diagram for steam humidifiers.
Fig. 5. Typical wiring diagram for
system with fan interlock.
H8908C
CHRONOTHERM® IV THERMOSTAT
B
FAN CONTROL
HUMIDIFIER
24V WIRING.
HUMIDIFIER
1
POWER
SUPPLY
TO
SYSTEM
FAN
2
H8908B
TRANSFORMER
L1
(HOT)
M13385
Fig. 8. Typical wiring diagram
of sail switch with humidifier.
H8908B
L1
(HOT) POWER
SUPPLY
L2
HUMIDIFIER
L1
(HOT)
L2
2
O
W
Y
R
G
H8908B
L2
DPST
SWITCHING
RELAY
1
H
L
C
2-SPEED
FAN
MOTOR
TRANSFORMER
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
HUMIDIFIER
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
24 VAC WIRING.
1
M13384
Fig. 6. Typical wiring diagram for system
with 2-speed fan motor.
PROVIDE OVERLOAD PROTECTION AND
DISCONNECT MEANS AS REQUIRED.
FAN
RELAY
COIL
1
M13366
Fig. 10. Typical parallel wiring of humidity controller
with Chronotherm® IV Thermostat for
dehumidification and mildew control.
3
69-1341
H8908B HUMIDISTAT H8908C DEHUMIDISTAT
ADJUSTMENTS
CHRONOTHERM® IV THERMOSTAT
Humidity Control Adjustment
B
O
W
Y
G
R
H8908C
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
To maintain optimum humidity control without causing
condensation on cold surfaces such as windows, the
homeowner must adjust the setpoint as the outdoor
temperature changes.
To reduce the relative humidity, reduce the setpoint
approximately three percent relative humidity every 24
hours. To increase the relative humidity, increase the
sepoint approximately three percent relative humidity
every 24 hours.
FAN
RELAY
COIL
Setpoint Adjustment
1
1 PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
M13367
Fig. 11. Typical series wiring of humidity controller
with Chronotherm® IV Thermostat for
dehumidification and mildew control.
Set the humidity setpoint according to the prevailing
outdoor temperature. See Table 1 for recommended
settings.
Table 1. Recommended Humidity
Controller Settings.
Outdoor Temperature
H8908C
VENTILATOR/DEHUMIDIFIER
DEHUMIDISTAT
TERMINALS
M13383
Fig. 12. Typical wiring diagram for HR150,
HR200, ER150 and ER200 Ventilator
or HD220 Dehumidifier applications.
°F
°C
Recommended
Humidity
Controller Setting
-20
-29
15
-10
-23
20
0
-18
25
+10
-12
30
+20
-7
35
>+20
>-7
40
OPERATION AND CHECKOUT
Place the system in operation and observe through at
least one complete cycle to make certain that all components are functioning properly.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524
69-1341
G.H. 10-99
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 3N7
Printed in Taiwan R.O.C.
www.honeywell.com