Originally Posted by
paulnederland
Hi,
Hardware:
- I've installed two branches in my forced air system with a motorized damper each to control air supply to each branch.
- Each branch will be controlled by its own thermostat
- Heating or Cooling will be supplied by a Goodman GPH1436H41 heat pump
Controls:
- One action by the thermostat requires action by both the heat pump and the damper motor. Easy: use one double-pole double-throw relay each on W1 and Y. This way, the damper will be activated the same time there goes a call for either heating of cooling to the heat pump. Both circuits would be fully isolated from each other.
- A time-delay-on-make relay will ensure that the heat pump has time to settle when asked to switch from cool to heat or reverse.
My question:
if one thermostat sends a call for heat (energizes WH), and at the same time, the second thermostat is switched to cooling (energizes OR and YL), what does the Goodman heat pump decides to do?
Just a few little notes for clarification:
- I cannot use a single thermostat with two sensors because I need to control both dampers indepently. A single thermostat with two temperature sensors has only one output and therefore cannot control two dampers indepently.
- The ducts in each branch are large enough to handle the total airflow in case only one branch is active.
- The two conflicting outputs from both thermostats will not be a regular occurance. I don't even mind if the system ignores either the cooling or the heating command. I just need to know what the behaviour is. Maybe it starts short cycling until is goes KABOOM?
Thanks for your help!
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Have fun and keep us informed on your project.
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