1704.1 Heat Pump Distribution System

The heat pump distribution system shall be designed as follows:

(1) Individual heat pumps shall have the capacity to handle the peak load for each zone at its peak hour.

(2) Distribution piping and fittings shall be insulated to prevent condensation inside the building.

(3) An isolation valve shall be installed on both supply and return of each unit.

(4) Condensate drains on heat pumps shall be installed in accordance with the manufacturer’s installation instruc tions.

(5) Air filters shall be installed for heat pump units.

(6) Drain valves shall be installed at the base of each supply and return pipe riser for system flushing.

(7) Piping shall be supported in accordance with Section 313.0 and provisions for vibration, expansion or contraction shall be provided.

(8) Specifications for each heat pump, the heating and cooling capacity, the fluid flow rate, the airflow rate, and the external pressure or head shall be provided on the construction documents.

(9) Manually controlled air vents shall be installed at the high points in the system and drains at the low points. Where the heat-transfer fluid is a salt or alcohol, automatic air vents shall not be installed.

(10)Means for flow balancing for the building loop shall be provided.

(11)Supply and return header temperatures and pressures shall be marked.