®
Heat Pump Installation and User’s Guide
Multiple Unit Installation
1. Heat Pump, Heater and/or Solar Combination
In certain regions of the country it may be more
economical to run a UltraTemp
®
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, if so equipped,
during the hottest portion of the year and a heater
during the cooler months. The Pentair heat pump may
be used in conjunction 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.
A recommended plumbing layout for a heat pump /
heater / solar combination heating system for a pool /
spa combination is shown below. 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.
HEATER
2. Multiple Heat Pump Connections
All plumbing on multiple heat pump installations must be
done in parallel (see next page). An equal flow of water
to each heat pump is important for optimum operation.
Note: It may be necessary to adjust the water pressure
switch if a unit is installed below the water level. Refer
back to page 6 for details on when and how to adjust the
pressure switch.
Each heat pump in a multiple unit installation
allows a maximum flow rate of 100 gpm (380 lpm)
and requires a minimum of 30 gpm (110 lpm).
12"
min.
(305 mm)
HEAT PUMP
POOL
RETURN
POOL
NTAKE
SPA
CHECK
VALVE
SPA
MAKE-UP
FILTER
CHECK
VALVE
FROM SOLAR
TO SOLAR
RETURN
POOL
DRAIN
SPA
NTAKE
SPA
DRAIN
PUMP
Multiple Unit Installation:
Heater and/or Solar Combination
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