We are tendering a small job with VRV. 7 in ceiling fan coil units, each one serves a single zone.
Here is what the engineer specified:
1.The zone supply air shall modulate to control the zone space temperature. The supply air temperature shall be constant.
2. If the internal space temperature drops below the set point, reset the supply air temperature.
Is that a common control method of DX systems? I am confused how to control it with the above specification.
My understanding is, when the space temp reaches the setpoint, the compressor will unload, and there will be no refrigerant circulating the evaporator in this fan coil unit. Since the space temp will not drop below the setpoint, how to reset the supply air temperature? Also how to modulate the supply air? using volume control damper? They are all single speed fan without VFD.