Four Pipe Fan Coil

Fan coils provide conditioned air to an area by recirculating air through the coils. A four-pipe fan coil unit consists of a fan, air filter, chilled water cooling coil, and hot water heating coil.

Required Objects

The four pipe fan coil must have the following properties.

• It must be connected to a hot water loop.
• It must be connected to a chilled water loop.
• It must be attached to a conditioned zone.

Design Assumptions

If the Draw Ventilation property is selected, the following will occur.

• The unit will provide the design outdoor air flow.
• The fan will run constantly during occupied hours.

If the Draw Ventilation property is not selected, the following will occur.

• The unit will not provide any ventilation.
• The fan will cycle on and off to meet conditioning needs.

Property	Value	Notes
System air flow	Constant
Cooling supply air temperature	12.78°C
Heating supply air temperature	40°C

Cooling Coil

The cooling coil has the following assumptions.

Property	Value	Notes
Design coil leaving air temperature	12.78°C
Chilled water design inlet temperature	N/A	Set by the chilled water loop.
Chilled water design outlet temperature	N/A	Set by the chilled water loop.

Heating Coil

The heating coil has the following assumptions.

Property	Value	Notes
Coil leaving air temperature	40°C
Hot water design inlet temperature	N/A	Set by the hot water loop.
Hot water design outlet temperature	N/A	Set by the hot water loop.

Supply Fan

The supply fan has the following assumptions.

Property	Value	Notes
Pressure rise	250 Pa
Total efficiency	70%
Motor efficiency	94%