
VISIONPRO
®
8000 WITH REDLINK™
129
68-0312—03
Wiring IAQ Equipment or a Heat/Cool Stage to the Universal Terminals
To Thermostat
“U” terminals can be used for humidification, dehumidification, ventilation or a stage of heating/cooling.
Fig. 327. Wiring a powered humidifier, dehumidifier, or
ventilator.
Fig. 328. Dehumidification with low speed fan using a
variable speed blower.
1Wire the thermostat universal relay to the low speed fan for
dehumidification control at the equipment. The thermostat
relay can be set to normally open or normally closed in the
thermostat installer setup.
Fig. 329. Wiring a non-powered humidifier, dehumidifier, or
ventilator.
Fig. 330. Wiring a heat or cool stage to U1.
1U1 terminals are normally open dry contacts when set up for
a stage of heating or cooling.
2You must install a field jumper if the stage of heating or cool-
ing is powered by system transformer. Do NOT install a field
jumper if the stage of heating has its own transformer.
Normally open, dry contacts
Normally closed, dry contacts
C
K
R
C
R
U1
U1
120
VAC
24
VAC
C
R
SYSTEM
TRANSFORMER
120
VAC
24
VAC
HUM, DEHUM OR
VENT
TRANSFORMER
THERMOSTAT
POWERED
HUMIDIFIER,
DEHUMIDIFIER
OR VENTILATOR
1
C
K
R
C
R
U1
U1
120
VAC
24
VAC
C
R
SYSTEM
TRANSFORMER
THERMOSTAT
DEHUMIDIFICATION
WITH LOW SPEED FAN
FIELD INSTALL JUMPER
BETWEEN R AND U1
OR
C
K
R
C
R
U1
U1
120
VAC
24
VAC
C
R
SYSTEM
TRANSFORMER
THERMOSTAT
NON-POWERED
HUMIDIFIER,
DEHUMIDIFIER
OR VENTILATOR
FIELD INSTALL JUMPER
BETWEEN R AND U1
2
C
K
R
C
R
U1
U1
120
VAC
24
VAC
C
R
TRANSFORMER
THERMOSTAT
HEAT STAGE 3, COOL
STAGE 3, BACKUP HEAT
STAGE 2 FOR HEAT
PUMPS, OR GEOTHERMAL
RADIANT HEAT
1