2-pipe fan coil units

2-pipe fan coil unit

On/Off (heating or cooling)

V1

Heating/cooling valve actuator

M1

3-speed fan

N1

Thermostat

4-pipe fan coil units

4-pipe fan coil unit

On/Off (heating and cooling)

V1

Heating or heating/cooling valve actuator

V2

Cooling valve actuator

M1

3-speed fan

N2

Thermostat