VisionPROTM TH8000 Series
5

1H/1C Heat Pump (no auxiliary heat)

Rc Power [1]
R [R+Rc joined by jumper]
O/B Changeover valve [5]
Y Compressor relay
G Fan relay
C 24VAC common [3]
S1 Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor

2H/1C Heat Pump (with auxiliary heat)

L Equipment monitor [6, 7]
E Emergency heat relay [8]
Aux Auxiliary heat relay (Heat 2) [8]
Rc Power [1]
R [R+Rc joined by jumper]
O/B Changeover valve [5]
Y Compressor relay
G Fan relay
C 24VAC common [3]
S1 Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor

2H/2C Heat Pump (no auxiliary heat)

Y2 Compressor 2 relay
Rc Power [1]
R [R+Rc joined by jumper]
O/B Changeover valve [5]
Y Compressor 1 relay
G Fan relay
C 24VAC common [3]
S1 Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor

3H/2C Heat Pump (with auxiliary heat)

Y2 Compressor 2 relay
L Equipment monitor [6, 7]
E Emergency heat relay [8]
Aux Auxiliary heat relay (Heat 2) [8]
Rc Power [1]
R [R+Rc joined by jumper]
O/B Changeover valve [5]
Y Compressor 1 relay
G Fan relay
C 24VAC common [3]
S1 Optional outdoor/remote sensor
S2 Optional outdoor/remote sensor
Shaded areas below apply only to TH8320/TH8321.
Wiring guide—heat pump systems
Wiring

See [notes] below

[1] Power supply. Provide disconnect means and overload protection as required.
[3] Optional 24VAC common connection.
[5] O/B set to control as either O or B in installer setup.
[6] If L terminal is used, 24VAC common (terminal C) must be connected.
[7] Heat pump reset (powered continuously when thermostat is set to Em. Heat; system monitor
when set to Heat, Cool, or Off).
[8] Install field jumper between Aux and E terminals if there is no emergency heat relay.