Technical data

15
Pressure Temperature Relief Valve Running
• Normal Operation
It is normal and desirable for the PTR valve to allow a small quantity of
water to escape during the heating cycle, however there may be a
problem if the valve continuously dribbles more than a bucket full of
water in a normal 24 hour cycle. Note: During the first 24 hours after
installation the valve may discharge more than a bucket full of water.
This is normal however excess discharge should only occur during the
initial 24 hour heat up period.
• Continuous dribble
Try gently raising the easing lever on the relief valve for a few seconds
(refer to “Pressure Temperature Relief Valve” on page 9). This may
dislodge a small particle of foreign matter and clear the fault. Release
the lever gently.
• Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises above the
designed pressure of the water heater. Ask your installing plumber to fit
a pressure limiting valve.
Warning: Never use reconditioned relief valves and never replace
the relief valve with one of a higher pressure rating.
• Heavy flows of hot water until the water heater is cold - then stops until
water reheats.
The water heater must be switched off at the isolating switch or
switchboard. Phone Aquamax Service or their nearest Accredited
Service Agent to arrange for an inspection.
Expansion Control Valve Running
If an expansion control valve is fitted in the cold water supply line to the
water heater, it may discharge a small quantity of water instead of the
water heaters pressure temperature relief valve. This has the benefit of
conserving energy as the discharged water is cooler (refer to the “Cold
Water Supply Plumbing Arrangement” diagram on page 19 for expansion
control valve location).
Higher Than Expected Electricity Bills
Check the following points if your electricity bill is higher than expected:
• Is the relief valve running excessively?
Refer to “Pressure Temperature Relief Valve Running” on page 15.