Honeywell TH8000 Benutzerhandbuch

For 24VAC primary power, connect common 
side of transformer to “C” terminal.

Insert supplied batteries for 

primary or backup power.

Push excess wire back into the wall opening. Plug 
wall opening with non-flammable insulation.

Remove factory-installed jumper 
only for two-transformer systems.

Conventional Terminal Letters:
R 

Heating power. Connect to secondary 
side of heating system transformer.

Rc  Cooling power. Connect to secondary 

side of cooling system transformer.

C 

Common wire from secondary side of 
cooling transformer (if 2 transformers).

W  1st stage heat relay.
W2  2nd stage heat relay.
Y 

1st stage compressor contactor.

Y2  2nd stage compressor contactor.
G 

Fan relay.

S1  Optional outdoor or remote sensor.
S2  Optional outdoor or remote sensor.

Heat Pump Terminal Letters:
R 

Heating power. Connect to secondary 
side of heating system transformer.

Rc  Cooling power. Connect to secondary 

side of cooling system transformer.

C 

Common wire from secondary side of 
cooling system transformer.

Y 

1st stage compressor contactor.

Y2  2nd stage compressor contactor.
Aux  Auxiliary heat relay.
G 

Fan relay.

E 

Emergency heat relay.

L 

Heat pump reset (powered continuously 
when System is set to Em Heat; system 
monitor when set to Heat, Cool or Off).

O/B  Changeover valve for heat pumps.
S1  Optional outdoor or remote sensor.
S2  Optional outdoor or remote sensor.

Shaded areas below apply only to TH8320/TH8321.