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Step 3 - Before you go any further
Determine what your existing wiring and equipment situation is
before you disconnect any wires. If you are unsure of what type of
system you have, you may need to seek professional support.
A. If you have a Heating only system without Air Conditioning, the
Venstar EXPLORER thermostat will require 3 wires. These 3 wires
are: R (24Vac), C (24Vac) and W (Heat). Most Heating only systems
use very simple thermostats that only require 2 wires the R (24Vac)
and W (Heat). The EXPLORER thermostat requires 3 wires to the
thermostat. In this case an Add-A-Wire accessory will not work
and it will be necessary to install another wire for the C (24Vac)
connection.
B. If you have a single stage fossil fuel heater with air conditioning,
the Venstar EXPLORER will require 5 wires for independent fan
control. They are R (24Vac), C (24Vac), W (Heat), Y (Cooling), and G
(Fan). You may connect only 4 wires, as instructed below, to the
EXPLORER but will give up independent fan control. The fan will
still operate with a Heating or Cooling demand.
• 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).
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