Honeywell THM5421R1021 Guia De Instalacion página 10

Wiring humidification, dehumidification and ventilation
"U" terminals can be used for humidification, dehumidification or ventilation.
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
24
VAC
VAC
C
Typical hookup of powered dehumidifier
(whole house dehumidifer)
U3
U3
U2
U2
U1
POWERED
DEHUMIDIFIER
U1
RH
RC
R
24
24
VAC
VAC C
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
120
VAC
24 120
VAC VAC
120
VAC
24 120
VAC VAC
120
VAC
Typical hookup of non-powered
humidifier
U3
1
U3
U2
U2
NON-POWERED
U1
HUMIDFIER
U1
RH
RC
R
24
24 VAC
VAC
C
Typical hookup of non-powered
ventilation
U3
1
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
U1
WITH LOW SPEED FAN
OR
U1
RH
RC
R
24 VAC
C
10
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
VAC
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
VAC
2
DEHUMIDIFICATION
FIELD INSTALLED
JUMPER BETWEEN
R AND U1
120
24
VAC
VAC