69-1341EF G.H. 8-02
www.honeywell.com
/yourhome
H8908B HUMIDISTAT/H8908C DEHUMIDISTAT
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
Automation and Control Solutions
Honeywell
Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North
35 Dynamic Drive
Golden Valley, MN 55422
Scarborough, Ontario
M1V 4Z9
Fig. 10. Typical parallel wiring of humidity controller
with Chronotherm® IV Thermostat for
dehumidification and mildew control.
Fig. 11. Typical series wiring of humidity controller
with Chronotherm® IV Thermostat for
dehumidification and mildew control.
Fig. 12. Typical wiring diagram for HR150,
HR200, ER150 and ER200 Ventilator
or HD220 Dehumidifier applications.
ADJUSTMENTS
Humidity Control Adjustment
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.
Setpoint Adjustment
Set the humidity setpoint according to the prevailing
outdoor temperature. See Table 1 for recommended
settings.
Table 1. Recommended Humidity
Controller Settings.
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.
B
O
W
Y
G
R
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
COIL
CHRONOTHERM® IV THERMOSTAT
PROVIDE OVERLOAD PROTECTION AND
DISCONNECT MEANS AS REQUIRED.
M13366
H8908C
1
1
B
O
W
Y
G
R
HEATING
RELAY OR
VALVE COIL
COOLING
CONTACTOR
COIL
FAN
RELAY
COIL
CHRONOTHERM® IV THERMOSTAT
H8908C
PROVIDE OVERLOAD PROTECTION
AND DISCONNECT MEANS AS REQUIRED.
M13367
1
1
VENTILATOR/DEHUMIDIFIER
M13383
H8908C
DEHUMIDISTAT
TERMINALS
Outdoor Temperature
Recommended
Humidity
Controller Setting
°F
°C
-20
-29
15
-10
-23
20
0
-18
25
+10
-12
30
+20
-7
35
>+20
>-7
40
