Important Notes:
- Heat pump condensers are not recommended
- Isolation relays are required to separate the transformer voltages from each condenser
- Any air handler with model number 15th digit = D will need to be modified to a "C" two speed unit. Below is a link for the modification.
- Test mode function will not bring on high speed fan operation.
- Y2 terminal on the Relay Board will need to have 24 vac before the supply fan will run in high speed in cooling
- Refrigerant lines on the two condensers must not be manifolded into one refrigerant line.