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Y
G
W
RC
RH
HEAT
COOL
HEAT
COOL
RC
RH
W
Y
G
ON
OFF
OFF
AUTO
THERMOSTAT
SYSTEM
FAN
RELAY
COOLING
RELAY
24vAC
120vAC
TRANSFORMER
JUMPER
WIRE
HEATING
SYSTEM
WIRE
NUTS
TYPE 2273/2274
DEHUMIDISTAT
DEHUMIDISTAT
FIELD-WIRING
TYPE 1F90(W)
AUX.
RELAY
AUXILIARY RELAY
CONTACTS
S.P.S.T N.O.
GREEN WIRE
HUMIDISTAT CONTROL
Normally, the system is wired so that the Furnace humidi-
fier can operate only when the furnace blower is operat-
ing, and only if the Humidistat control is calling for humid-
ity. If the furnace blower is also used for the air-
conditioning system, the humidistat should be turned to
full "OFF" during the cooling season.
SETTING & ADJUSTMENT
1. Although a relative humidity environment of 45-50%
may be desirable, setting your humidistat at this point
when the outside temperature is below -1°C (30°F) can
cause condensation on windows and walls. Contin-
ued condensation for extended periods of time may
result in structural damage. Use the following chart, as
a guide for maximum dial settings for various outdoor
temperatures. If condensation forms at these sug-
OPERATION
At Outside °C
Temperature °F
Above 0°
Above +20°
-5
+20
-10
+10
-20
0
Recommended
Setting
25% 30%
35% 40%
THERMOSTAT
SWITCH
FIXED
COOLING
ANTIC.
BIMETAL
COOL
HEAT
ADJ. HEATING ANTIC.
THERMOSTAT
CAPTIVE
SCREWS
FAN
SWITCH
FAN
RELAY
COOLING
RELAY
24vAC
120vAC
TRANSFORMER
Figure 5. Typical Parallel Wiring Diagram of Dehumidistat with
1E56/1F56(W) Heat/Cool Low Voltage Thermostat
FIELD-
INSTALLED
JUMPER
HEATING
SYSTEM
SYSTEM
SWITCH
SUBBASE
SYSTEM
WIRE
NUTS
TYPE 2273/2274
DEHUMIDISTAT
TYPE 1E56/1F56(W) THERMOSTAT
DEHUMIDISTAT
FIELD-WIRING
gested settings, reduce the humidistat setting by
successive 5% increments. After each reduction in
setting allow 6 hours for equilibrium to be reached
before further re-adjustment.
2. An operational check can be made as follows:
a. Turn humidistat knob to "ON" position. Turn the
thermostat fan switch to "ON" the humidifier should
start.
b. Then rotate knob to desired setting.
c. Turn thermostat fan switch back to "AUTO".
Figure 6. Typical Parallel Wiring Diagram of Dehumidistat with 1F90(W) Heat/Cool
Low Voltage Digital Thermostat
NOTE:
AUXILIARY RELAY REQUIRED ON
DIGITAL HEAT/COOL THERMOSTATS
WHICH HAVE TRIAC OUTPUT ON "Y"
TERMINAL.
GREEN WIRE
NOTE:
IF COOLING BLOWER DOES NOT OPERATE, ENERGIZED
THROUGH "G" TERMINAL OF THERMOSTAT SUB-BASE WHEN
DEHUMIDISTAT IS ENERGIZED. REFER TO FIG. 6, FOR AUXILIARY
RELAY WIRING TO ENERGIZE BLOWER.
LOCATE AUXILIARY
RELAY AT FURNACE