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HM750A1000
NOTE: If a Prestige, VisionPRO, Lyric (or similar) are used to control humidity, wire the two HUM contacts to terminals 1
and 2 on the HM750. With the jumper in place between terminals 1 and 8 on the HM750, only these two wires are
necessary to control humidity. Be sure to configure the control to force fan on with a call for humidity, or run on a
heat cycle if the fan enable wiring is not used.
33-00289—01
R
HVAC
C
U
U
R C
W
Y
G
S
S
OUTDOOR
SENSOR
SPDT RELAY
COM
NOTE: SPDT RELAY IS NECESSARY TO PREVENT
ENERGIZING THE Y TERMINAL IF THE
R Rc
W
Y
G
THERMOSTAT DOES NOT ISOLATE Y AND G.
THERMOSTAT
Fig. 24. Wiring the steam humidifier with a mechanical thermostat.
AIR PROVING
OR JUMPER
NC
NO
14
Air Proving
AP
AP
Humidistat
24VAC
COM
HUM
HUM
External
GT
RF
GF
M37198
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