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CONNECTIONS – PLUMBING
TEMPERATURE PRESSURE RELIEF VALVE
The temperature pressure relief valve is shipped behind the front cover. 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
installation diagram
• 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
"Relief Valve Drain"
• 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
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
page 36). A copper drain line must be fitted to the expansion control valve (refer
to
"Relief Valve Drain"
on page 34).
on page 39).
on page 39).
38
"Water Supplies"
(refer to diagram
on
on
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