Honeywell THX9321 Prestige 2.0 System Installation Manual page 15

Wiring guide — IAQ equipment (EIM or thermostat)
"U" terminals can be used for humidification, dehumidification or ventilation.
With power supply
Typical hookup of powered humidifier.
U3
U3
U2
U2
U1
POWERED
HUMIDIFIER
U1
RH
RC
R 24
24
VAC
VAC C
Typical hookup of powered ventilation.
U3
U3
U2
U2
U1
POWERED
VENTILATOR
U1
RH
RC
R
24
VAC
VAC
C
Typical hookup of powered dehumidifier
(whole house dehumidifier).
U3
U3
U2
U2
U1
POWERED
DEHUMIDIFIER
U1
RH
RC
R
24
VAC
C
1 ANY COMBINATION OF UNIVERSAL RELAYS (U1, U2, U3) CAN BE USED. THEY ARE SET IN THE THERMOSTAT
INSTALLER SETUP.
WIRE THE THERMOSTAT OR EIM UNIVERSAL RELAY TO THE LOW SPEED FAN FOR DEHUMIDIFICATION
2
CONTROL AT THE EQUIPMENT. THE THERMOSTAT OR EIM RELAY CAN BE SET TO NORMALLY OPEN OR
NORMALLY CLOSED IN THE THERMOSTAT INSTALLER SETUP.
= NORMALLY OPEN, DRY CONTACTS
= NORMALLY CLOSED, DRY CONTACTS
24 120
VAC VAC
120
VAC
24 120
VAC VAC
24 120
VAC
24 120
VAC VAC
24 120
VAC VAC
THX9321/9421 Prestige
Without power supply
Typical hookup of non-powered humidifier.
U3
U3
U2
U2
U1
U1
RH
RC
R
24 VAC
C
M32393
Typical hookup of non-powered ventilation.
U3
U3
U2
U2
U1
U1
RH
RC
R
24 VAC
C
M32396
Typical hookup of variable speed blower for
dehumidification in low speed.
OR
24 VAC
M32398
KEY
15
IAQ and RF EIM
®
NON-POWERED
HUMIDIFIER
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
24
VAC VAC
NON-POWERED
VENTILATOR
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
24
VAC
VAC
U3
1
U3
U2
2
U2
DEHUMIDIFICATION
U1
WITH LOW SPEED FAN
U1
RH
RC
R 120
24
VAC VAC
C
M32394
M32397
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
M32392
M32954
69-2490—05