Robertshaw RS9110 Installation Manual page 13

Power supply.
1
Factory-installed jumper. Remove only when installing on 2-transformer systems.
2
Use either O or B terminals for reversing valve.
3
Use a small piece of wire (not supplied) to connect W and Y terminals.
4
Set fan operation switch to electric.
5
Optional 24 VAC common connection when thermostat is used in battery power mode.
6
Typical 1H/1C system: 1 transformer
COMPRESSOR
RELAY
FAN RELAY
HEAT RELAY
Typical 1H/1C system: 2 transformers
REMOVE JUMPER
(HOT)
COMPRESSOR
WIRING
RELAY
FAN RELAY
HEAT RELAY
(HOT)
(HOT)
11