Fan Coil Unit Thermostat Not Working

Thermostat equipment for fan coils and ahu s.

Fan coil unit thermostat not working.

A the fan coil unit is controlled by a unit mounted controller provided by mechanical systems controls contractor mscc. As was the case with evaporator coil issues a condensing unit might have an excessively dirty coil or refrigerant leakage. If you aren t getting 24 volts between g and c then you might have a thermostat problem a thermostat wire problem or the low voltage fuse on the control board might be blown. How chiller ahu rtu work working principle air handling unit rooftop unit hvac system duration.

If it does not turn the furnace and air conditioner power back off again at the breaker panel. Study the wires inside the thermostat. If your system has frozen up turn off your thermostat for one to three hours to see if it unfreezes. On a further call for cooling the thermostat signals for the fan to speed up from its.

I have further analyzed the wiring between the fan coil units and thermostats and it definitely looks like temporary stuff. Condensing unit not turning on at all. It sounds like the relay or control board in the unit is defective the thermostat tells the unit to come on in heat mode after that controls inside the furnace not thermostat should send power to the blower to come on. Check under the unit and the cold exterior surface of the indoor coil enclosure.

Choose the red and white wires if you are having problems with. B on a call for cooling the thermostat signals for the heating control valve to modulate toward the closed position. I am especially concerned about possible confusion between the fancoil s c terminal fancoil to water control valve and y terminal thermostat to fancoil for water control valve. Fan will not come on in the on position or your fan will not come on when you turn the thermostat down in the air conditioning mode.

Check your outdoor unit for signs of water if the fan is still not turning on. I want to connect the heat pump and fan coil unit not the electric heat to my generator panel and keep the electric heat on a different circuit how can this be done. Additional issues with the outdoor condensing unit might include a faulty compressor a failing condenser fan motor or a faulty run capacitor. The engineering mindset 659 350 views.