To Equipment Interface Module; Wiring A Powered Humidifier; Wiring A Non-Powered Humidifier; Wiring A Low Speed Fan For Dehumidification - Honeywell THX9321 Prestige 2.0 Product Data

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Wiring IAQ Equipment or a Heat/Cool Stage to the Universal Terminals

To Equipment Interface Module

"U" terminals can be used for humidification, dehumidification or ventilation.
U3
1
U3
U2
U2
U1
POWERED
HUMIDIFIER
U1
RH
RC
R
24
VAC
VAC
C
Fig. 339. Wiring a powered humidifier.
U3
1
U3
U2
U2
U1
POWERED
VENTILATOR
U1
RH
RC
R
24
VAC
C
Fig. 340. Wiring a powered ventilator.
U3
1
U3
U2
U2
U1
POWERED
DEHUMIDIFIER
U1
RH
RC
R
24
C
VAC
Fig. 341. Wiring a powered dehumidifier (whole house
dehumidifer).
1 Any combination of universal relays (U1, U2, U3) can be used. They are set in the thermostat installer setup.
2 Wire the universal EIM relay to the low speed fan for dehumidification control at the equipment. The EIM relay can be set to be
normally open or normally closed in the thermostat installer setup.
Normally open, dry contacts
Normally closed, dry contacts
24
120
VAC
VAC
24
120
VAC
24
120
VAC
VAC
24
120
VAC
VAC
24
120
VAC
VAC
24
120
VAC
VAC
®
THX9321 PRESTIGE
2.0 AND THX9421 PRESTIGE
24 VAC
Fig. 342. Wiring a non-powered humidifier.
24 VAC
Fig. 343. Wiring a non-powered ventilator.
OR
24 VAC
Fig. 344. Wiring a low speed fan for dehumidification.
149
®
U3
1
U3
U2
U2
NON-POWERED
U1
HUMIDFIER
FIELD INSTALLED
U1
JUMPER BETWEEN
R AND U1
RH
RC
R
24
120
VAC
VAC
C
U3
1
U3
U2
U2
NON-POWERED
U1
VENTILATOR
FIELD INSTALLED
U1
JUMPER BETWEEN
R AND U1
RH
RC
R
120
24
VAC
VAC
C
U3
1
U3
U2
2
U2
DEHUMIDIFICATION
U1
WITH LOW SPEED FAN
U1
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
RH
RC
R
24
120
VAC
VAC
C
IAQ WITH EIM
68-0311—02

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Thx9421 prestige iaq with eim

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