5
C. If you have a multi stage HVAC system comprised of a fossil fuel
heater with air conditioning the Venstar EXPLORER will require the
5 wires mentioned above (R, C, W, Y, and G) plus an additional wire
for each additional stage of Heating or Cooling. You may reduce
the 5 wire requirement to 4 if you give up independent fan control,
or use the optional accessory; Add-A-Wire.
D. If you have a heat pump without aux heat the Venstar EXPLORER
will require 5 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve), Y
(1st stage compressor), and G (fan). If there are only 4 wires present
that are connected to the existing thermostat, there are at least 3
options available to connect the Venstar EXPLORER thermostat,
they are:
1. Use the 4 wires as instructed below and note that the fan will
only operate with a Heating or Cooling demand.
2. Pull new thermostat wire from the HVAC equipment to the
thermostat so that there are at least 5 wires available.
3. Purchase and install a Venstar Add-A-Wire accessory (ACC-0410).
E. If you have a heat pump with aux heat the Venstar EXPLORER will
require 6 wires: R (24Vac), C (24Vac), W1/O/B (reversing valve), Y (1st
stage compressor), W2 (Aux Heat) and G (fan). If there are only 5
wires present that are connected to the existing thermostat, there
are at least 3 options available to connect the Venstar EXPLORER
thermostat, they are:
1. Use the 5 wires as instructed below and note that the fan will
only operate with a Heating or Cooling demand.
2. Pull new thermostat wire from the HVAC equipment to the
thermostat so that there are at least 6 wires available.
3. Purchase and install a Venstar Add-A-Wire accessory (ACC-0410).
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