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CONNECTIONS – PLUMBING
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is supplied in the parts kit. The temperature pressure relief valve must
be fitted to the hot water outlet before the water heater is operated. Before fitting the relief valve, make sure
the probe has not been bent.
To fit the relief valve:
•
Seal the thread with an approved thread sealant such as Teflon tape - never hemp. Make sure tape does
not hang over the end of the thread.
•
Hand tighten the valve into the hot water outlet Tee (refer to the
•
Using a spanner engaged on the valve's spanner flats and applying medium pressure to tighten, turn the
relief valve an additional ½ to 1 ½ turns to secure and make the joint watertight, leaving the valve drain
pointing downwards and away from the electrical cover.
Warning: Do not use a pipe wrench or poor fitting tool on the valve body nor over tighten the valve,
as this could damage the valve and prevent safe operation.
•
Operate the easing lever on the valve to check the smooth operation of the valve plunger. It is very
important the lever is raised and lowered gently. The lever should move smoothly and without undue force.
•
If the lever cannot be moved or is jerky in its movement, then the valve has been damaged and must be
replaced.
•
A copper drain line must be fitted to the temperature pressure relief valve (refer to
page 59). The drain line must not be installed in front of or prevent access to the electrical cover of the
water heater.
•
The valve 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.
Where a preformed insulation collar has been supplied with the temperature pressure relief valve in the
parts kits, the installation of this insulation collar meets these requirements. It must be placed over the
body of the valve and secured in position with the cable tie provided after the valve has been fitted to the
water heater.
EXPANSION CONTROL VALVE
An expansion control valve is supplied in the parts kit and must be installed. Install the expansion control valve
using a brass Tee, brass union and brass nipple on the cold water line to the water heater.
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
to the expansion control valve. Refer to
The expansion control valve and its easing gear must be accessible from ground or floor level. It must not be
installed either on the roof or in the ceiling space unless it is an accessible trafficable area. Extend the cold
water line from the expansion control valve to the cold water inlet fitting on the water heater.
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.
cold water connection diagram
"Relief Valve Drain"
58
installation diagrams
on page 56. A copper drain line must be fitted
on page 59.
on pages 35 and 36).
"Relief Valve Drain"
on
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