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WIRING
CAUTION
Voltage Hazard.
Power supply can cause electrical shock
and injury.
Disconnect power supply before installation or
servicing.
All wiring must comply with applicable local codes,
ordinances and regulations.
IMPORTANT
Use 18- to 22-gauge insulated wire for proper
wiring. Stranded-tinned wire is recommended.
Connect the humidistat to the furnace for the following
two reasons:
1. The control can determine the outdoor tempera-
ture.
2. The control knows when the furnace blower is
operating, eliminating the need for current sensing
relays.
JUMPER 24 HOT TO
HUM TO PROVIDE
POWER FOR
SOLENOID VALVE
HE260
DEHUM
DEHUM
HUM
HUM
HOT
COM
OFF
24VAC
L2
L1
Fig. 5. Wiring for flow-through by-pass humidifiers.
H1008A,D AUTOMATIC HUMIDITY CONTROL
IMPORTANT
When installing a steam-powered humidifier, be
sure to cut steam jumper-wire for correct
operation.
To wire the Automatic Humidity Control:
1. Connect 24 Vac power to the 24 Vac HOT and
COM terminals on the H1008A,D.
2. Connect the humidifier to the two HUM terminals
on the H1008A,D as shown in Fig. 5 through 8.
3. In furnace systems with two transformers, connect
CG to the cooling system transformer common and
connect CW to the heating transformer common.
Be sure G and W connect to the R terminals of
both transformers. (If only one transformer is used,
leave the jumper on CG and CW. See Fig. 10.)
4. To wire the C7089H Outdoor Temperature Sensor,
connect it to two OUT terminals on the H1008A,D.
IMPORTANT
For correct wiring, use 18- to 22 gauge
insulated wire. Stranded-tinned wire with a
maximum length of 300 ft (91m) is
recommended.
DO NOT REMOVE
JUMPER UNLESS
YOU ARE USING
AN OUTDOOR
TEMPERATURE
OUT
SENSOR
OUT
(OPTIONAL)
G
SYSTEM COMMON
CG
(REQUIRED)
CW
(REQUIRED)
W
TEST
WIRE H1008 IN PARALLEL
WITH FAN TIMER BOARD
TERMINALS
3
FAN TIMER
BOARD
W
G
C
M19605
69-1185EF-3
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