Source 1 S1-TBSU305-S Owner's Manual & Installation Instructions page 16

Installation Instructions
Check Dip Switches
Ensure which switch is correct for
your system. Dip switches are located
on the back of the thermostat.
GAS
RV=O
GAS/ELEC
GAS
OR
GAS
RV=O
OR
RV=O
GAS/ELEC
OR
GAS/ELEC
ELEC
RV=B
HEATPUMP
1. When GAS/EL or HP is set for GAS/EL:
This switch (GAS or ELEC) controls how the
ELEC
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
ELEC
will energize the fan in heating.
2. When GAS/EL or HP is set for HP:
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
RV=B
When the GAS/EL or HP dip switch is configured
for HP , 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
RV=B 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
HEATPUMP
a heat pump, leave this switch set for GAS/EL.
HEATPUMP
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