VISIONPRO
®
8000 WITH WI-FI
®
33-00096—01 84
WIRING
* 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
would like the thermostat to be powered with a common wire. Use the K terminal in place of the Y and G terminals on conven-
tional 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 page 85 and the THP9045 instructions (form 69-2065EFS) for more information.
Electrical Hazard.
Can cause electrical shock or equipment damage.
Disconnect power before wiring.
All wiring must comply with local electrical codes and
ordinances. See Fig. 225–232.
1. Select wiring diagram that corresponds with system type
and the equipment being installed.
2. Loosen the screws for the appropriate terminals. Insert
wires in the terminal block under the loosened screw.
See Fig. 222.
3. Securely tighten each screw.
4. Push excess wire back into the hole.
5. Plug the hole with nonflammable insulation to prevent
drafts from affecting the thermostat.
6. See Fig. 225–232 for typical wiring hookups.
Fig. 222. Inserting wires in thermostat terminal block.
IMPORTANT
Use 18–22 gauge thermostat wire.
Table 9. Thermostat Terminal Designation Descriptions.
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.
S1
S1
W
Y
G
W2
Y2
A
S1
S1
O/B
Y
G
AUX
-E
Y2
L/A
K
RC
R
U1
U1
U2
U2
C
CONVENTIONAL
HEAT PUMP
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