Pentair ThermalFlo - Manual (Page 17)

9
ThermalFlo Installation and User’s Guide
Multiple Unit Installation
Heat Pump, Heater and/or Solar 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, if so equipped, during the hottest portion of the year and a heater during the cooler months.
The Pentair Water 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 in Figure 8. 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
HEAT PUMP
TO SOLAR
FILTER
S
DRAIN
POOL
DRA
SPA
INTAKE
POOL
INTAKE
SPA
RETURN
POOL
RETURN
SPA
MAKE-UP
VALVE
VALVE
Figure 8.