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INSTALLATION – WATER HEATER
46
PIPE COVER
The pipe work to the water heater can be housed within a pipe cover. A pipe cover kit (PN 299830) is
available for such an installation. Refer to the installation instructions which accompany the pipe cover kit.
RECESS INSTALLATION
The water heater can be installed recessed into a wall. A recess box (PN 299831) is available for such an
installation. Refer to the installation instructions which accompany the recess box kit for information on its
installation.
An additional rating label is supplied attached to the inside of the front cover of the water heater. This is for a
service person to access the water heater details when required. The rating plate on the side of the water
heater should be moved to or the information copied onto either the front panel of the water heater or to
another position which is visible when the water heater is installed so the householder can access the water
heater details when required.
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.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below, an approved pressure
limiting valve that does not have non return valve characteristics (such as an RMC PSL series valve) is
required and should be fitted as shown in the installation diagram (refer to page 55).
Model
27
Relief valve setting
1750 kPa
Max. mains supply pressure
1000 kPa
Min. mains supply pressure *
140 kPa
* minimum water supply pressure required to achieve the
rated flow and performance
Notes:
It is not recommended to install this water heater with a low pressure water supply.
A minimum water supply pressure of 140 kPa is required to achieve the rated flow and performance of
the water heater.
If this water heater is installed as an in-series gas booster for a solar water heater, the maximum water
supply pressure to the solar water heater, without an expansion control valve (ECV), is generally
800 kPa, however it may be less than this for some models. Refer to the Owner‟s Guide and Installation
Instructions supplied with the solar water heater for maximum mains supply pressure details.
If sludge or foreign matter is present in the water supply, it is recommended a suitable filter be
incorporated in the cold water line to the water heater.
This water heater is not suitable for connection to bore water or spring water unless a water treatment
device is fitted.
Refer to “Water Supplies” on page 40 for further information on water chemistry.
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