Venstar ColorTouch Quick Start Manual - Step 3
4
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 ColorTouch 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 ColorTouch 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 ColorTouch 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
ColorTouch 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 ColorTouch 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).