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13
SWIMMING POOL HEAT PUMP
Manual
4.2 Water Piping
² Single Unit Installation
Figure 6 illustrates the standard plumbing layout with a single heat pump unit.
Following the diagram from right to left, the plumbing sequence is as follows: Pool >
Pool Pump > Filter > Heat Pump > Check Valve > Chemical Feeder > Pool. Note For
normal installations, do not install a shutoff valve or any kind of variable restriction in
the water piping between the heat pump outlet and the pool/spa.
Filtered water is plumbed to the inlet, located on the right side of the heat pump
front panel. Heated water flows through the outlet, located on the left side of the
heat pump front. Two inch unions are provided.
Automated chlorine distribution systems, if used, must be placed downstream of
the heater to minimize harm to the pool equipment. Use rigid PVC piping if possible.
All joints should be glued with PVC glue. When the piping installation is complete,
operate the pool pump and check the system for leaks. Then, check the filter
pressure gauge to verify that there isn’t any indication of excessive pump head
pressure. You can also make the connections using high-pressure flexible hose, but
make sure the hose can withstand high pressure. The installation of a heat pump
bypass is not necessary unless the water flow exceeds 75 GPM.
² Multiple Unit Installation
Heat Pump and Heater Combination
In certain regions of the country it may be more economical to run a heat pump
during the warmer months and a gas heater during the cooler months. In some
situations it may be desirable to run the heat pump in the “Chiller” mode during
the hottest portion of the year and a heater during the cooler months. The heat
pump may be plumbed with a gas or electric heater or any combination of heat
sources including solar. All heat sources must be plumbed in series to work correctly
and efficiently.
Figure 7 illustrates a recommended plumbing layout for a heat pump / heater /
solar combination heating system for a pool / spa combination. Your system may not
contain all of these components, but the basic plumbing will apply by eliminating the
component in the illustration that is not a part of your system.
Multiple Heat Pump Connections
All plumbing on multiple heat pump installations must be done in parallel (see
Figures 8 and 9). An equal flow of water to each heat pump is important for optimum
operation.
Note: It may be necessary to adjust water pressure switch if a unit is installed
below the water level. See Section 5.6 for details on when and how to adjust the
pressure switch. Each heat pump allows a maximum flow rate of 70 gpm (265 lpm)
and requires a minimum of 20 gpm (76 lpm).
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