Venstar ColorTouch - Wiring Assessment

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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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).