CONNECTIONS – PLUMBING
24
PIPE SIZES
To achieve true mains pressure operation, the solar preheat 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
solar preheat pipe and hot pipe size is DN20.
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.
The pipe work between the solar storage tank and the gas booster water heater
MUST BE
of copper
and be fully 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 both
the solar storage tank and the gas booster water heater. An isolation valve must be installed on the
water line to the gas booster water heater.
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
23). Refer to the Gas Installations Standard AS 5601 for the correct pipe
sizing.
Note:
The pipe size selection must take into account the high gas input of this water heater
(refer to
table on page
20
)
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. Warranty does not cover damage of any nature resulting from failure to observe this precaution.
Refer to rating label for gas types and pressures.