Robertshaw RS8110 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 system (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 24 volt cooling transformer
RH/R 24 volt heating transformer OR 24 volt
power terminal if a common wire is present
B Heat pump reversing valve energized in
heating
C 24 volt common terminal
Wirespecifications
Use shielded or non-shielded 18-22 gauge thermo-
stat wire.
C terminal
The C (common wire) terminal does not have to
be connected when the thermostat is powered by
batteries.
Y Compressor relay