2-pipe fan coil unit | 4-pipe fan coil unit |
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N1 Room thermostat | YHC Heating/cooling valve actuator |
YH Heating valve actuator | YC Cooling valve actuator |
B1 Return air temperature sensor or external room temperature sensor (optional) | B2 Changeover sensor (optional) |
M1 1-speed or 3-speed fan |
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