Rheem W2W Series, Owner'S Manual And Installation Instructions

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INSTALLATION
22
LEGEND
Two Temperature Zones Using a Temperature Limiting Device
If a pressure limiting valve is installed on the cold water line to the water heater
system and the cold water line to a temperature limiting device branches off
before this valve or from another cold water line in the premises, then a pressure
limiting valve of an equal pressure setting may be required prior to the
temperature limiting device.
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
This heat pump water heater may be installed as part of a circulated hot water
flow and return system in a building as long as a temperature boosting water
heater is not installed downstream of the heat pump.
If a temperature boosting water heater is installed the circulated hot water flow
and return system must return to the inlet of the temperature boosting water
heater, and not the heat pump, to avoid potential nuisance tripping.
Temperature Limiting Device
A temperature limiting device cannot be installed in circulated hot water flow and
return pipe work unless the device is designed for such application, such as
Rheem Guardian. The tempered water from a temperature limiting device cannot
be circulated. Where a circulated hot water flow and return system is required in
a building, a temperature limiting device can only be installed on a dead leg,
branching off the circulated hot water flow and return pipe.