Single or Two Transformer Link 1/Link 2 configurationsUpdated 6 months ago
Many thermostats may have an RC/RH wire jumper installed. This would apply when one R-wire is present, indicating a single-transformer system. When wiring the ZEN thermostat a RC/RH jumper wire is not required. The ZEN thermostat utilizes a pair of links located on the backside of the thermostat.
Link 1 and Link 2 inserted (Default):
- 1-Transformer HVAC system.
- RC and RH circuits share the same transformer Common.
Link 1 inserted; Link 2 removed:
- 2-Transformer HVAC system.
- RC and RH circuits are separate R (24V) power sources.
- W1, W2 or W2 Aux return to the RH (Heating) transformer.
Link 2 inserted; Link 1 removed:
- 1-Transformer HVAC system.
- RC and RH circuits share the same transformer Common.
W1, W2 or W2 Aux return to a separate circuit not using the transformer Common.