Rheem HPHD-135HNU-483 Owner's Manual And Installation Instructions page 28

Commercial Air to Water Heat Pump Water Heater
HEAT PUMP AND TANK ASSEMBLY
The configuration of the auxiliary water heating plant can
vary depending on the requirements of the individual in-
stallation.
Low Ambient Temperature Heating Only - Where
the auxiliary water heater is required to be activated if the
heat pump cannot operate due to low ambient conditions,
the heat pump can activate the auxiliary heater or pump.
There are many configurations depending on system de-
sign. Refer to Application Guide for details on the auxiliary
boost function designed for this system.
In Line Boosting Only - Where the auxiliary water
heater is required to ensure sufficient hot water is avail-
able for periods after the main peak or to boost the tem-
perature of the water produced by the heat pump for other
purposes (eg high temperature for kitchen and laundry
use), an auxiliary water heater must be installed in series
with the storage tanks. ie, the hot water outlet from the
storage tanks must feed into the inlet of the auxiliary water
heater(s).
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NOTE: Where storage tanks are used, boosting in the
top portion of the storage tank is equivalent to boosting
in series.
Where multiple auxiliary water heaters are required to be
manifolded together, these must be manifolded. Refer to
next page.
This arrangement can also be adapted to include recircu-
lation heat loss make up and / or low ambient temperature
activation heating. Refer to Application Guide for options.