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69-1341 G.H. 10-99 Printed in Taiwan R.O.C. www.honeywell.com
Home and Building Control Home and Building Control
Honeywell Inc. Honeywell Limited-Honeywell Limitée
Honeywell Plaza 155 Gordon Baker Road
P.O. Box 524 North York, Ontario
Minneapolis, MN 55408-0524 M2H 3N7
H8908B HUMIDISTAT H8908C DEHUMIDISTAT
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 com-
ponents are functioning properly.
BO
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