How can I prevent my HRV from turning on the Air condtioner?
The HRV has a relay to turn on the furnace fan. The N/O contact is wired to the furnace conrtrol board on the Red (24 Vac) and Green (Fan). This works well.
The thermostat is also wired to these furnace contacts along with a yellow wire for the A/C.
When the HRV energizes the Green to turn the furnace fan on, the thermostat also energizes the yellow / AC.
Do I need an additional relay to prevent the HRV from turning on the A/C?