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CONNECTIONS – PLUMBING
57
PIPE SIZES
The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing
the most suitable pipe size to ensure adequate flow for each individual application. Reference to the
technical specifications of the water heater and local regulatory authority requirements must be made.
To achieve true mains pressure operation, the cold water line to the water heater should be the same size or
bigger than the hot water line from the water heater.
The minimum recommended cold pipe or solar preheat pipe and hot pipe size is DN20.
IN-SERIES BOOSTER
The pipe work between the solar storage tank (if one is installed) and the in-series gas booster has a
minimum recommended pipe size of DN20, MUST BE of copper and be fully insulated with a closed cell type
insulation or equivalent 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 both the solar storage tank and the in-series gas booster. A full flow isolation valve must be
installed on the water line to the in-series gas booster.
GAS INLET
The gas connection is made at the underside of the water heater. The pipe work must be cleared of foreign
matter before connection and purged before attempting to operate the water heater. An isolation valve and
disconnection union must be installed to allow servicing and removal of the water heater (refer to the
diagram on page 56).
Note: Refer to the Gas Installations Standard AS 5601 or AS/NZS 5601.1 for the correct method of sizing
the gas supply pipe to the water heater. The pipe size selection must take into account the high gas input of
this water heater (refer to table on page 52) as well as all of the other gas appliances in the premises.
Warning: Always isolate the water heater before pressure testing the gas supply system. Disconnect the
water heater after the isolation valve to prevent the risk of serious damage to the gas control. The Rheem
warranty does not cover damage of any nature resulting from failure to observe this precaution. Refer to
rating label for gas types and pressures.
CONNECTIONS – ELECTRICAL
All electrical work and permanent wiring must be carried out by a qualified person and in accordance with the
Wiring Rules AS/NZS 3000 and all local codes and regulatory authority requirements.
Warning: Temperature controllers must not be fitted to this water heater (874 series) if it is installed as
an in-series gas booster with a solar water heater system or if a Water Star water heater is installed,
because water at a temperature much higher than the controller setting can be delivered. If a solar or
Water Star water heater is installed to an existing water heater installation, then all controllers must be
disconnected and removed.
The water heater is supplied with a 1.8 metre lead and plug and requires a weatherproof 240 V 50 Hz
general purpose outlet (GPO) to be located within 1.2 metres of the installation. The GPO must be clear of
the flue exhaust, draining water, gas supply pipe and water connections.
The power consumption of the water heater is:
Component
Power
consumption
Comments
Gas water heater
80 Watts
627 – Burner on, anti frost device inactive
175 Watts
627 – Burner on, anti frost device active
The water heater will only operate on a sine wave at 50 Hz. Devices generating a square wave cannot be
used to supply power to the water heater.
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