Fan Coil Unit Thermostat Not Working

Study the wires inside the thermostat.

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. Thermostat equipment for fan coils and ahu s. Check under the unit and the cold exterior surface of the indoor coil enclosure. The engineering mindset 659 350 views.

If your system has frozen up turn off your thermostat for one to three hours to see if it unfreezes. 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. 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. Condensing unit not turning on at all.

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. How chiller ahu rtu work working principle air handling unit rooftop unit hvac system duration. I have further analyzed the wiring between the fan coil units and thermostats and it definitely looks like temporary stuff. Test to make sure you are getting 24 to 28 volts ac between the g green and c com terminals on you fan center or control board.

Check your outdoor unit for signs of water if the fan is still not turning on. If there is a circuit breaker for the fan coil unit disconnect the electric heat from this breaker and use a separate breaker for just the heating elements and connect it to power source you want. Choose the red and white wires if you are having problems with. If it does not turn the furnace and air conditioner power back off again at the breaker panel.

On a further call for cooling the thermostat signals for the fan to speed up from its. Additional issues with the outdoor condensing unit might include a faulty compressor a failing condenser fan motor or a faulty run capacitor. As was the case with evaporator coil issues a condensing unit might have an excessively dirty coil or refrigerant leakage. 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.