CONNECTIONS – PLUMBING
23
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 solar storage tank and from the solar
storage tank to the in-series gas booster 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 work between the solar storage tank and the in-series gas booster
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
22).
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
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. The Vulcan
warranty does not cover damage of any nature resulting from failure to observe this precaution. Refer to
rating label for gas types and pressures.
