Addition of ACC0410 Add-A-Wire to Venstar Thermostats
The ACC0410 Add-A-Wire is an accessory used when an extra wire needs to be added to the Venstar thermostats, when adding heating or cooling to a heat-only or cool-only system or when fixing a broken wire. It can also be used when adding cooling to a heat-only system.
Sample Wiring Diagrams
For thermostats that need 5 wires, the accessory is used with the existing 4 wires. This is where no extra wires can be run.
Systems that have heating with 3-wires can also use the accessory to introduce cooling.
Where heating and cooling is needed, It can be used with 2 existing wires. In this setup there is no independent fan switching.
In the sample diagram below, the 4 existing wires can be used to accommodate a single stage heat pump.
In some cases, you may need to sacrifice the independent indoor unit fan control. Follow the steps below:
- Connect the wire from the G terminal (which controls your indoor fan) to the C terminal (common) on the thermostat.
- Move the G terminal (controls indoor fan) wire to the C terminal.
- Connect a jumper wire from the Y terminal to the G equipment terminal at the heating and cooling equipment. This way, when the thermostat calls for heating or cooling the fan will turn on without the option of independent fan control.
Learn more on HVAC systems and controls in the link here.
Contact our HVAC Controls Engineering team for assistance with custom HVAC control solutions.
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