Honeywell PRESTIGE THX9321 - Manual (Page 149)

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