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CONNECTIONS – PLUMBING
The
flexible
supplied with the temperature
pressure relief valve meets these
requirements and must be placed
over the body of the valve (refer to
the
diagram
on page 38).
"Left and Right Hand Side
Refer to
Water Connections"
instructions on how to plug the unused
connection.
EXPANSION CONTROL VALVE
Local regulations may make it mandatory to install an expansion control valve
(ECV) in the cold water line to the water heater. In other areas, an ECV is
required if the saturation index is greater than +0.4 (refer to
page 19).
The expansion control valve must always be installed after the non-return valve
and be the last valve installed prior to the water heater (refer to the
connection diagram
expansion control valve (refer to
The valve, if installed within 500 mm of the water heater, must be insulated with
closed cell polymer insulation or similar (minimum thickness 9 mm) and the
insulation installed so as not to impede the operation of the valve. The insulation
must be weatherproof and UV resistant if exposed.
RELIEF VALVE DRAIN
DN15 copper drain lines must be fitted to the temperature pressure relief valve
and expansion control valve (if one is installed) to carry the discharge clear of
the water heater. Connect the drain lines to the valves using disconnection
unions. The drain line from the valve to the point of discharge should be as short
as possible, have a continuous fall all the way from the water heater to the
discharge outlet and have no tap, valves or other restrictions in the pipe work. A
drain line from a relief valve must comply with the requirements of
AS/NZS 3500.4.
A drain line must be no longer than nine (9) metres with no more than three
bends greater than 45° before discharging at an outlet or air break. The
maximum length of nine (9) metres for a drain line is reduced by one (1) metre
for each additional bend required of greater than 45°, up to a maximum of three
additional bends. Where the distance to the point of final discharge exceeds this
length, the drain line can discharge into a tundish.
insulation
collar
on page 36 for
on page 35). A copper drain line must be fitted to the
"Relief Valve Drain"
USE TEFLON TAPE
FIT SUPPLIED INSULATION TO
flexible insulation collar
on page 38).
38
VALVE AS SHOWN
"Water Supplies"
cold water
on
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