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VisionPRO
TM
TH8000 Series
5
69-2389—03
ENGLISH
1H/1C Heat Pump (no auxiliary heat)
R Power [1]
O/B Changeover valve [3]
Y Compressor relay
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
2H/1C Heat Pump (with auxiliary heat)
L Equipment monitor [4, 5]
E/Aux Auxiliary/emergency heat relay
R Power [1]
O/B Changeover valve [3]
Y Compressor relay
G Fan relay
C 24VAC common [2, 4]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
2H/2C Heat Pump (no auxiliary heat)
Y2 Compressor 2 relay
R Power [1]
O/B Changeover valve [3]
Y Compressor 1 relay
G Fan relay
C 24VAC common [2]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
3H/2C Heat Pump (with auxiliary heat)
Y2 Compressor 2 relay
L Equipment monitor [4, 5]
E/Aux Auxiliary/Emergency heat relay
R Power [1]
O/B Changeover valve [3]
Y Compressor 1 relay
G Fan relay
C 24VAC common [2, 4]
S1/S2 Optional outdoor/remote/discharge
sensor
U1/U1 Optional IAQ relay
Steam humidifier (or any humidifier with
its own transformer)
R Power [1]
U1 Humidifier relay [7]
U1 Humidifier relay [7]
Bypass, flow-through humidifier (or any
humidifier that uses the system trans-
former)
R Power [1]
U1 Field jumper R to U1 [7]
U1 Humidifier relay [7]
Whole house dehumidifier
R Power [1]
U1 Dehumidifier relay [7]
U1 Dehumidifier relay [7]
A/C with low-speed fan
R Power [1]
U1 Field jumper R to U1 [7]
U1 Dehumidifier relay [8]
Whole house powered ventilator
R Power [1]
U1 Ventilator relay [7]
U1 Ventilator relay [7]
Non-powered ventilator
R Power [1]
U1 Field jumper R to U1 [7]
U1 Ventilator relay
Wiring guide—heat pump systems
Wiring guide—humidification systems
Wiring guide—dehumidification systems
Wiring guide—ventilation systems
Wiring
See [notes] below
[1] Power supply. Provide disconnect means and overload protection as required.
[2] Optional 24VAC common connection.
[3] O/B set to control as either O or B in installer setup.
[4] If L terminal is used, 24VAC common (terminal C) must be connected.
[5] Heat pump reset (powered continuously when thermostat is set to Em. Heat; system monitor
when set to Heat, Cool, or Off).
[7] Terminals are normally open dry contacts.
[8] Equipment must include dehumidification terminal for low-speed fan.