Robertshaw RS9110 Installation Manual page 12

WIRING
Caution: Electrical Hazard
Failure to disconnect the power
before beginning to install this
product can cause electrical
shock or equipment damage.
Wiring
1. If you are replacing a thermostat, make
note of the terminal connections on the
thermostat that is being replaced. In some
cases the wiring connections will not be
color coded. For example, the green wire
may not be connected to the G terminal.
2. Loosen the terminal block screws. Insert
wires then retighten terminal block screws.
Tips:
RH & RC terminals
For single transformer systems, leave the jumper wire in
place between RH and RC. Remove jumper wire for two
transformer systems.
Heat pump systems (With No AUX or
Emergency Heat)
If wiring to a heat pump, use a small piece of wire
(not supplied) to connect terminals W and Y.
10
Warning:
All components of the control
system and the thermostat
installation must conform to
Class II circuits per the NEC Code.
Terminal Designations
W Heat relay G Fan relay
O Heat pump reversing valve energized
in cooling
RC Transformer power for cooling
RH Transformer power for heating
B Heat pump reversing valve energized in heating
C Common wire from system transformer
C terminal
The C (common wire) terminal does not
have to be connected when the
thermostat is powered by batteries.
Wire specifications
Use shielded or non-shielded 18-22 gauge
thermostat wire.
Y Compressor relay