Honeywell Prestige IAQ YTHX9421 - Wiring Humidification, Dehumidification and Ventilation

5
POWERED
HUMIDIFIER
RH
RC
R
C
U3
U3
U2
U2
U1
U1
24
VAC
120
VAC
24
VAC
120
VAC
24
VA
C
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
POWERED
VENTILATOR
RH
RC
R
C
24
VA
C
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
VA
C
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
Typicalhookupofpoweredhumidier Typical hookup of non-powered
humidier
Typical hookup of powered ventilation
Typicalhookupofpowereddehumidier
(whole house dehumidifer)
Typical hookup of variable speed blower
fordehumidicationinlowspeed
Typical hookup of non-powered
ventilation
Any combination of universal relays (U1, U2, U3) can be used. They are set in the
thermostat installer setup.
WiretheuniversalEIMrelaytothelowspeedfanfordehumidicationcontrolat
the equipment. The EIM relay can be set to be normally open or normally closed
in the thermostat installer setup.
1
2
Normally open, dry contacts
Normally closed, dry contacts
Wiring humidification, dehumidification and ventilation