PROSTAT+ OEM PSP4273, Installer Manual, Page: 4 / 32

Installer Guide
3
GAS/ELEC
OR
RV=B
RV=O
ON
1
2
3
1
GAS
RV=O
GAS/ELEC
ELEC
RV=B
HEATPUMP
ON
23
1
GAS
RV=O
GAS/ELEC
ELEC
RV=B
HEATPUMP
ON
23
RV=B
RV=O
ON
1
2
3
OR
ELEC
GAS
ON
1
2
3
ELEC GAS
ON
1
2
3
OR
ON
1
2
3
HEATPUMP
GAS/ELEC
ON
1
2
3
HEATPUMP
1. When GAS/ELEC or HEATPUMP is set for GAS/ELEC:
This switch (GAS or ELEC) controls how the
thermostat will control the Fan (G) terminal in
heating mode. When GAS is chosen, the thermostat
will not energize the Fan (G) terminal in heating.
When ELEC is chosen the thermostat will energize
the fan in heating.
2. When GAS/ELEC or HEATPUMP is set for HEATPUMP:
This switch (GAS or ELEC) defines the Aux Heat
type. When GAS is chosen, the auxiliary heat will
not be allowed to run during heat pump operation.
When ELEC is chosen, up to two stages of auxiliary
strip heat will be allowed to run.
For Heat Pump Only
When the GAS/ELEC or HEATPUMP dip switch is
configured for HEATPUMP, this dip switch (O or
B) must be set to control the appropriate reversing
valve. If O is chosen, the W1/O/B terminal will
energize in cooling. If B is chosen, the W1/O/B
terminal will energize in heating.
This dip switch configures the thermostat to
control a conventional gas/electric system or a
heat pump. If your system is anything other than
a heat pump, leave this switch set for GAS/ELEC.
3 Check Dip Switch
Ensure which switch is correct for your
system. Dip switches are located on the
back of the thermostat.
PSP4273_Installer man.indd 3 PSP4273_Installer man.indd 3 6/9/21 11:23 AM 6/9/21 11:23 AM