Venstar EXPLORER, Quick Start Setup Manual

11

Step 8

  -  

Check Dip Switch

1)  Ensure which switch is correct for 

your system. Dip switches are located 
on the back of the thermostat

GAS/EL 

HP

OR

GAS/EL

 HP

ON

1

2

3

ON

1

2

3

OR

O

B

B

O

ON

1

2
 

3

ON

1

2 

3

GAS

ELEC

OR

GAS

ELEC

ON

1

2

3

ON

1

2

3

1

GAS

O

GAS/EL

ELEC

B

HP

ON

23

1

GAS

O

GAS/EL

ELEC

B

HP

ON

23

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 

(T3900)

. When 

ELEC

 is chosen, up to two stages of 

auxiliary strip heat will be allowed to run. 

For Heat Pump Only 

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.

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.