AquaMAX G270VE Series - Manual (Page 27)

26
Expansion Control Valve
In some areas, local regulations may make it mandatory to install an
expansion control valve (ECV) in the cold water line to the water heater.
Refer to ‘Scaling Water’ on page 16.
The ECV must always be installed after the non return valve and be the last
valve installed prior to the water heater (refer to the ‘Cold Water Supply
Plumbing Arrangement’ diagram on page 25). A copper drain line must be
fitted to the ECV (refer to ‘Relief Valve Drain(s)’ on page 26).
Pressure Temperature Relief valve (PTR valve)
The pressure temperature relief (PTR) valve must be fitted before the water
heater is operated. Before fitting the PTR valve, make sure the valve probe
has not been bent. Seal the valve thread with thread sealing tape (never
use hemp) and ensure the tape does not protrude past the end of the
thread.
Screw the PTR valve clockwise into the right hand side opening on the
water heater marked ‘PTR’ (refer to diagram on page 36) with the valve
outlet pointing downwards. Do not use a wrench on the valve body – use a
spanner on the spanner flats. A copper drain line must be fitted to the PTR
valve (refer to ‘Relief Valve Drain(s)’ on page 26).
The valve is supplied with an insulation collar. This must not be removed.
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.
Relief Valve Drain(s)
DN15 copper drain lines must be fitted to the ECV and PTR 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 9 metres with no more than three
bends greater than 45° before discharging at an outlet or air break. The
maximum length of 9 metres for a drain line is reduced by 1 metre for each
additional bend required of greater than 45°, up to a maximum of three