Conventional system without C wire ( also known as 4-wire system )
Remove the cover of the furnace or heating system, open the cover of the heating/cooling system to find the
control board where you should find the same terminal labels as of the thermostat, move the G-wire to the
C-wire, then connect G and Y terminals with the jumper wire (included in packing box).
At the same thermostat, connect C-wire and G-wire.
By this configuration, the thermostat will have NO fan control function.
NOTE : You may need to unscrew the cover, the control board may be either at the top or bottom.
1 .
2 .
3 .
Furnace
Thermostat
RC RH
G W/E Y C
O/B
Furnace wiring
termind
Move G wire to C terminal
Move G wire to C terminal
R
G
W/E
Y
C O/B
jumper
13
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