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HM750A1000
NOTE: If a Prestige, VisionPRO, Round Smart (or similar) is used to control humidity, wire the two U contacts from
thermostat to HUM and HUM on the HM750. With the jumper in place between AP terminals on the HM750, only
these two wires are necessary to control humidity. Be sure to configure the thermostat to force fan on with a call
for humidity if the RF, GT, and GF wiring is not used.
33-00289EF—03
H6062
HUMIDIPRO
R
C
U
THERMOSTAT
U
R
W
Y
G
Rc
S
S
OUTDOOR
SENSOR
R
C
W
Y
G
HVAC
Fig. 24. Wiring the steam humidifier with a mechanical thermostat.
AIR PROVING
OR JUMPER
14
Air Proving
AP
AP
Humidistat
24VAC
COM
HUM
HUM
External
GT
RF
GF
HM750
M37760
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