Wiring Iaq Equipment Or A Heat/Cool Stage To The Universal Terminals - Honeywell TH8320R1003 Installation Manual

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.
THERMOSTAT
C
K
R
C
R
POWERED
U1
HUMIDIFIER,
DEHUMIDIFIER
U1
OR VENTILATOR
Fig. 327. Wiring a powered humidifier, dehumidifier, or
ventilator.
THERMOSTAT
C
K
R
C
R
1
U1
OR
U1
Fig. 328. Dehumidification with low speed fan using a
variable speed blower.
1 Wire 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.
Normally open, dry contacts
Normally closed, dry contacts
SYSTEM
TRANSFORMER
C
24 120
VAC VAC
R
HUM, DEHUM OR
VENT
TRANSFORMER
24 120
VAC VAC
SYSTEM
TRANSFORMER
C
24 120
VAC VAC
R
FIELD INSTALL JUMPER
BETWEEN R AND U1
DEHUMIDIFICATION
WITH LOW SPEED FAN
THERMOSTAT
C
K
R
C
R
U1
U1
Fig. 329. Wiring a non-powered humidifier, dehumidifier, or
THERMOSTAT
C
K
R
C
R
1
U1
U1
Fig. 330. Wiring a heat or cool stage to U1.
1 U1 terminals are normally open dry contacts when set up for
a stage of heating or cooling.
2 You 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.
129
®
VISIONPRO 8000 WITH REDLINK™
SYSTEM
TRANSFORMER
C
24 120
VAC VAC
R
FIELD INSTALL JUMPER
BETWEEN R AND U1
NON-POWERED
HUMIDIFIER,
DEHUMIDIFIER
OR VENTILATOR
ventilator.
TRANSFORMER
C
24 120
VAC VAC
R
2
HEAT STAGE 3, COOL
STAGE 3, BACKUP HEAT
STAGE 2 FOR HEAT
PUMPS, OR GEOTHERMAL
RADIANT HEAT
68-0312—03