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Heat Pump Pool / Spa Heater Owner’s Manual
29
INSTALLATION IN COMBINATION WITH SOLAR OR GAS HEATERS
If you are installing a heat pump in combination with any other type of heating device, please call the
HAYWARD service department. We will advise you of installation practices that will help keep your
warranty valid.
If you are installing other
pool heaters, such as gas-
powered or solar-powered
devices:
1. They must be
installed in a parallel
circuit and operated
independently (only
one at a time) for
your warranty to stay
valid
. Because of the
intense heat that can
be generated by gas
and solar units, the
heat pump is
protected by isolating
it with shut-off valves
and a check valve
when gas or solar is in
operation.
OR
2. Installation of a heat pump
and solar unit in series is
achieved by plumbing to
this diagram. If you wish to
only run the secondary
heater, you can turn the heat
pump to “off” and still allow
water to flow through it.
Placing a check valve in the
line to prevent backflow of
hot water from the
secondary heater is critical
to the warranty and life of
your heat pump
.