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CONNECTIONS – PLUMBING
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is shipped either under the top flap of the water heater carton or behind
the front cover or in a plastic bag attached to the water heater. The temperature pressure relief valve must be
fitted 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 opening marked "Relief Valve" (refer to the
page 24).
•
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 water tight, leaving the valve drain
pointing downwards.
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 27).
•
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.
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
Supplies"
on page 13).
The expansion control valve must always be installed after the non-return valve and be the last valve installed
prior to the water heater
control valve (refer to
"Relief Valve Drain"
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.
(refer to diagram on page
on page 27).
25). A copper drain line must be fitted to the expansion
26
installation diagram
on
"Relief Valve Drain"
on
"Water
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