INSTALLATION WATER HEATER
18
FROST PROTECTION
The water heater has a frost protection system. The frost protection system will protect the water heater from
damage, by preventing ice forming in the waterways of the water heater, in the event of freezing conditions
occurring.
The frost protection system will be rendered inoperable if electrical power is not available at the water heater.
Damage to the water heater caused by freezing of the pipe work to or from the water heater is not covered
under the Rheem warranty. Refer to AS/NZS 3500.4 for precautions to be taken for installations in frost
prone areas. The water heater is not suitable for installation in areas where the ambient temperature falls
below -20°C (including wind chill factor).
The cold water line to the water heater must be insulated with suitable thickness insulation if freezing
conditions are likely to occur. The insulation must be fitted to the underside of the water heater and be
weatherproof and UV resistant if exposed.
PRESET OUTLET TEMPERATURE SETTING
The factory preset outlet temperature setting of the water heater is:
872 series 60°C for a single water heater
60°C as part of a Multipak system
70°C as part of a Commpak system
It is usually not necessary to check or adjust the factory preset outlet temperature setting of the water heater,
unless the customer or application has a particular requirement for this to be done.
For applications requiring sanitising temperatures, such as a commercial kitchen, it will be necessary to
adjust the preset outlet temperature setting to 82°C.
If the water heater is installed as part of a circulated hot water flow and return system in a building, the preset
outlet temperature setting must be set to at least 60°C. If the water temperature decreases by more than 5°C
through a circulated hot water flow and return system due to heat loss in the ring main, the preset outlet
temperature setting of the water heater should be set to at least 65°C.
Gas Booster for a Solar Water Heater
Note: AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. When this water heater is used as an in-series booster for a solar water heater it can satisfy
this AS 3498 requirement provided it is energised, the booster preset outlet temperature setting is 70°C or
higher, and that a remote temperature controller is not used.
It will be necessary to check and if required to adjust the preset outlet temperature setting of the continuous
flow water heater when:
it is installed as an in-series gas booster to a solar water heater
it is an existing continuous flow water heater and a solar water heater is then installed.
Refer to “Preset Outlet Temperature Setting” on page 35.
REDUCING HEAT LOSSES
The hot water line from the water heater and the pipe work between the solar storage tank, if one is installed,
and the in-series gas booster must be insulated in accordance with the requirements of AS/NZS 3500.4. The
insulation must be weatherproof and UV resistant if exposed. The insulation must be fitted up to the
connections on the both the underside of the water heater and the solar storage tank.
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