79 Manual & Installer Guide
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/EL.*
*For some commercial heat pumps, this switch may need to be
set for GAS/EL. Consult the commercial heat pump literature.
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 cooling.
If B is chosen, the W1/O/B terminal will energize in heating.
1. When GAS/EL or HP is set for GAS/EL:
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/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 using a Dual Fuel
system, set this switch for GAS. When ELEC is chosen, up to
two stages of auxiliary strip heat will be allowed to run.
GAS/EL HP
OR
GAS/EL HP
ON
1 2 3
ON
1 2 3
OR
O B BO
ON
1 2 3
ON
1 2 3
GAS/ ELEC
OR
GAS/ ELEC
ON
1 2 3
ON
1 2 3
SENSOR
GAS/EL
GAS
O
ON
1 2 3
HP
ELEC
B
W3/AUX
W2
W1-O-B
Explanation of Thermostat Dip Switches
Dip switches are located on the back of the thermostat
Installation Instructions – Dip Switches
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