Honeywell HM512W1005 - Page 19

WIRING
WIRING BASICS: CONFIGURATION 1
When using a thermostat with integrated
humidity control (such as VisionPRO IAQ
or Prestige):
A thermostat controls the fan and •
TrueSTEAM.Thecontrolwillnotallow
steam production unless the system fan
ison.
WireThermostatGtotheHVACsystemG •
asnormal.
Wire TrueSTEAM HUM terminals to the •
systemHUMterminals.
WIRING BASICS: CONFIGURATION 2
When using a humidistat separate from the
thermostat (such as H8908 or TrueIAQ):
The external humidity control does •
notmonitororcontrolthesystemfan.
TrueSTEAM must confirm that the fan has
powerbeforeallowinghumidity.
BreakthethermostatGtoHVACsystem•
Gconnection.WirethermostatGto
TrueSTEAMGT.WireTrueSTEAMGFto
HVACsystemG.
ThermostatGcallswillpassdirectly•
throughTrueSTEAM.Ifthissignalis
not present, and humidity is needed,
TrueSTEAMwillrelaypowerfromitsRT
terminaltoGFandouttoHVACsystem
Gtoensurethefanhaspowerfor
humiditycalls.
Thermostat with
Humidity Control
HVAC System
Tr ueSTEAM
1
HUM
HUM
2 3
R
C
M29617
Humidity Control
Thermostat
TrueSTEAM
HVAC System
HUM
HUM
R
G
GT
GGF
M29618
Note:Thisimageisnotacompletewiringdiagram.Itonlydepictsfanregulation.See
“Wiring the TrueSTEAM” on page 19.
Note:Thisimageisnotacompletewiringdiagram.Itonlydepictsfanregulation.See
“Wiring the TrueSTEAM” on page 19.
TrueSTEAMHumidicationSystem69-2285EF—01
17