Sorry for the long post. let me know if it is not clear. Thanks in advance.
The solar hot water system is connected to an solar-heated-water-to-air-coil in the duct of the heat pumps' air handling units (AHUs). I want to open the valves to the solar-heated-water-to-air-coils when the heat pumps' thermostats call for heat. When the temperature drops and the emergency heat is called for, I want to bring on the heat pumps too. Can someone help with the thermostat wiring?
The thermostat is a Traine 802 for one heat pump
The second heat pump has two Traine 802s connected to a Honeywell Total Zone 4 with the zones controlling dampers and the heat pump
Should the solar-pump relays be connected to the W1&R terminals and the heat pumps to the W2?
Currently, the W2 and Y2 are jumpered at the Honeywell. There are two unused wires to the thermostats.
FWIW, the solar-heated-water-to-air-coils are installed so the air flows through them after it flows through the heat pump coils in the AHUs.
The solar-heated-water-to-air-coils are valved off if the solar antifreeze loop is cool, by a pipe-thermostat which is on the antifreeze loop after the valve taps to the solar-heated-water-to-air-coils. The pipe-thermostat breaks the solar-heated-water-to-air-coil valves' transformer circuit, so the coils are not cold when there is a call for heat.
The circulator pump and coil valves will be controlled by DPDT relays which are attached to the room thermostats or Honeywell controller.
There is a pressure regulated antifreeze bypass around the solar-heated-water-to-air-coils. This is so that when the solar-heated-water-to-air-coil valves are both closed, and the circulator is running, it is not pumping against the valves and the solar/air coils are not cold when there is a call for heat. (I think I should add a fan control too so that the coils are hot before the fans start...)
I did not install the heat pump system and am not sure why the primary and secondary heat terminals are shorted.
I tried to upload some photos of the wiring but was unsuccessful. Send me an email for photos if needed.
The solar hot water system is connected to an solar-heated-water-to-air-coil in the duct of the heat pumps' air handling units (AHUs). I want to open the valves to the solar-heated-water-to-air-coils when the heat pumps' thermostats call for heat. When the temperature drops and the emergency heat is called for, I want to bring on the heat pumps too. Can someone help with the thermostat wiring?
The thermostat is a Traine 802 for one heat pump
The second heat pump has two Traine 802s connected to a Honeywell Total Zone 4 with the zones controlling dampers and the heat pump
Should the solar-pump relays be connected to the W1&R terminals and the heat pumps to the W2?
Currently, the W2 and Y2 are jumpered at the Honeywell. There are two unused wires to the thermostats.
FWIW, the solar-heated-water-to-air-coils are installed so the air flows through them after it flows through the heat pump coils in the AHUs.
The solar-heated-water-to-air-coils are valved off if the solar antifreeze loop is cool, by a pipe-thermostat which is on the antifreeze loop after the valve taps to the solar-heated-water-to-air-coils. The pipe-thermostat breaks the solar-heated-water-to-air-coil valves' transformer circuit, so the coils are not cold when there is a call for heat.
The circulator pump and coil valves will be controlled by DPDT relays which are attached to the room thermostats or Honeywell controller.
There is a pressure regulated antifreeze bypass around the solar-heated-water-to-air-coils. This is so that when the solar-heated-water-to-air-coil valves are both closed, and the circulator is running, it is not pumping against the valves and the solar/air coils are not cold when there is a call for heat. (I think I should add a fan control too so that the coils are hot before the fans start...)
I did not install the heat pump system and am not sure why the primary and secondary heat terminals are shorted.
I tried to upload some photos of the wiring but was unsuccessful. Send me an email for photos if needed.
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