Honeywell Wi-Fi VisionPRO 8000

4
Terminal Designations
Conventional System Heat Pump
Terminal Description Terminal Description
C
Common wire from secondary side of
cooling transformer (if 2 transformers).
C
Common wire from secondary side of
cooling transformer.
Rc* Cooling power. Rc Cooling power.
R* Heating power. R Heating power.
W Heat Stage 1 O/B Changeover valve for heat pumps.
W2 Heat Stage 2 AUX-E Backup Heat/Emergency Heat
Y Compressor Stage 1 Y Compressor Stage 1
Y2 Compressor Stage 2 Y2 Compressor Stage 2
G Fan Relay G Fan Relay
A
Connect to Economizer Module or
Lighting Panel (TOD).
L/A
Connect to Compressor Monitor, Zone
Panel, Economizer Module or Lighting
Panel (TOD).
U1 / U1
Universal relay for humidification,
dehumidification, ventilation, or a stage of
heating/cooling.
U1 / U1
Universal relay for humidification,
dehumidification, ventilation, or a stage of
heating/cooling.
S1 / S1
Universal input for a wired indoor, outdoor
or discharge sensor.
S1 / S1
Universal input for a wired indoor, outdoor
or discharge sensor.
K** Connect to K on Wire Saver module. K** Connect to K on Wire Saver module.
* Remove factory installed jumper for two transformer systems.
** The THP9045A1023 Wire Saver module is used on heat/cool systems when you only have four wires at the thermostat and you
need a fifth wire for a common wire. Use the K terminal in place of the Y and G terminals on conventional or heat pump systems to
provide control of the fan and the compressor through a single wire—the unused wire then becomes your common wire. See THP9045
instructions for more information.
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
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
CONNECTING A HEAT OR COOL STAGE TO U1DEHUMIDIFICATION WITH LOW SPEED FAN
NON-POWERED HUMIDIFIER, DEHUMIDIFIER OR VENTILATORPOWERED HUMIDIFIER, DEHUMIDIFIER OR VENTILATOR
Wire the thermostat universal relay to the low speed fan
for dehumidication control at the equipment. The
thermostat relay can be set to normally open or
normally closed in the thermostat installer setup.
1
U1 terminals are normally open dry contacts when set
up for a stage of heating or cooling.
You must install a eld jumper if the stage of heating
or cooling is powered by system transformer. Do NOT
install a eld jumper if the stage of heating has its own
transformer.
1
2
Normally open, dry contacts
Normally closed, dry contacts
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
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