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8.1.4 Pressure & Temperature Relief (PTR) Valve
• The system is supplied with a loose PTR valve appropriate to the pressure rating of the wa-
ter heater tank. If the PTR valve is not present please contact your supplier. The valve Rated
capacity: 850kPa;10kW; Set temperature: 93-99°C.
• The supplied PTR valve must be installed at Point 4 in section 7.1 Connection Dimensions
and Components under the socket marked “RELIEF VALVE”.
• The relief valve must be installed so that the drain line is facing downwards at all times with
the discharge point remaining open to the atmosphere.
8.1.5 Tempering Valve
NEVER replace the PTR valve with one which has a higher pressure rating than is specified.
Warning about possible dangers.
NEVER block the outlet of the PTR valve or it’s drain line for any reason. The
easing gear MUST be operated at least every 6 months to remove lime deposits
and verify that it is not blocked. Failure to do this may result in the water heater
failing. If the valve does not discharge water when the easing gear lever is
opened, or does not seal again when the easing gear is closed, attendance by
an authorised person MUST be arranged without delay. The PTR valve is not
serviceable.
Warning about possible dangers.
• Systems are automatically programmed to produce hot water in excess of 50°C. As such, in
accordance with AS/NZS3500, it is mandatory that a Tempering Valve is installed.
• We recommend a high performance or solar rated tempering valve is used to ensure a more
accurate hot water delivery temperature.
• Your old hot water system might not have had a tempering valve installed before and
therefore you will notice a change in the temperature of the hot water. This is normal and
required under new legislation. Should you have any concerns, please contact your installer.
It is normal and desirable that this valve allows a small quantity of water to be discharged
during the heating cycle. If it discharges more than a bucket of water during a 24 hour
period or discharges continuously there may be another problem.
If the valve dribbles continuously, try easing the valve gear for a few seconds as described
above. This may dislodge any foreign matter and alleviate the problem.
If the valve discharges at high flows, especially at night, it may be as a result of the water
pressure exceeding the design pressure of the water heater. Ask your installer to fit a
Pressure Limiting Valve (PLV).
8.1.6 Expansion Control Valve
• Please observe local requirements with regards to the installation of an ECV (optional in
most councils).
• When installing an ECV, ensure that the connecting pipe has a diameter no greater than that
of the safety valve. The ECV should be rated at no more than 700kPa
• Ensure the drain is sized to allow for water runoff, even in incidents where the safety valve
has been fully opened. The drain outlet must remain open to the atmosphere at all times
and must not have a closing.
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