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12 WIRING DIAGRAMS
WIRING DIAGRAM NOTES
1. Dashed lines are optional.
2. Optional common wire
allows system to power
thermostat.
3. Use “B” or “O” wire - but
not both in heat pump
systems. Generally neither
are required in a
conventional system.
4. If “Y” and “C” wires are
both present, then “C” is a
common wire.
5. If a “B” wire in your
system is a common wire
then connecting it to the B
terminal may cause damage
to your system.
6. The PSPA722 is not
compatible with Heat Pump
Systems.
WARNING: THIS IS A LOW
VOLTAGE THERMOSTAT
(24 volts). A SERIOUS
RISK OF FIRE EXISTS IF
YOU CONNECT THIS
THERMOSTAT TO A LINE
VOLTAGE APPLICATION
(typically 115 or 230 volts).
IF UNCERTAIN ABOUT THE
VOLTAGE CONSULT A
PROFESSIONAL
ELECTRICIAN.
TYPICAL 2 OR 3 WIRE HEAT ONLY HOOKUP
24V AC AND MILIVOLT SYSTEMS
FAN
AC LINE
JUMPER
PROVIDED
Omit fan connections
for two wire systems.
XFMR
GAS
VALVE
SYSTEM
COMMON
GBW2 Y2 O Y1W1 RC RH C
TYPICAL SINGLE STAGE
COOL ONLY HOOKUP
FAN
COMPRESSOR
XFMR
AC LINE
JUMPER
PROVIDED
SYSTEM
COMMON
GBW2 Y2 O Y1W1 RC RH C
TYPICAL 24V AC 4 WIRE HOOKUP
SINGLE STAGE HEAT AND COOL
FAN
JUMPER
PROVIDED
GAS
VALVE
XFMR 1
AC LINE
COMPRESSOR
SYSTEM
COMMON
GBW2 Y2 O Y1W1 RC RH C