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HM750A1000
NOTE: If a Prestige, VisionPRO, T10 (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—05
H6062
HUMIDIPRO
HUMIDITY BOOST
Light
SystemSelect
On
Next
R
C
U
THERMOSTAT
U
R
Rc
W
Y
G
S
S
OUTDOOR
SENSOR
C
R
W
Y
G
HVAC
Fig. 24. Wiring the steam humidifier with a mechanical thermostat.
Air Proving
AIR PROVING
OR JUMPER
Humidistat
External
HM750
14
HM750
Status
Idle
Filling
Humidifying
Draining
Service
Cylinder
Fault
Power
Drain
Fault Codes In Front Cover
AP
AP
24VAC
COM
HUM
HUM
GT
RF
GF
M37760A
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