Honeywell PRESTIGE THX9321 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
69-2490_B.indd 15
24 120
VAC VAC
120
VAC
M32393
24 120
VAC VAC
24 120
VAC
M32396
24 120
VAC VAC
24 120
VAC VAC
M32398
THX9321/9421 Prestige
Without power supply
Typical hookup of non-powered humidifier.
U3
U3
U2
U2
NON-POWERED
U1
HUMIDIFIER
U1
RH
RC
R
24
24 VAC
VAC
C
Typical hookup of non-powered ventilation.
U3
U3
U2
U2
NON-POWERED
U1
VENTILATOR
U1
RH
RC
R
24
24 VAC
VAC
C
Typical hookup of variable speed blower for
dehumidification in low speed.
U3
1
U3
U2
U2
DEHUMIDIFICATION
U1
WITH LOW SPEED FAN
OR
U1
RH
RC
R
24 VAC
C
KEY
15
IAQ and RF EIM
®
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
VAC
M32394
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
VAC
M32397
2
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
24 120
VAC VAC
M32392
M32954
69-2490—03
7/13/2011 1:41:59 PM