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THM0421 026512 Rev. E
Thermann Owner’s Manual
80L to 400L Electric Storage Water Heaters
Plumbing Connections
Pressure & Temperature Relief Valve
The Pressure & Temperature Relief
Valve is supplied loose with the water
heater. The valve rating is:
All models = 1000kPa
The PTR valve must be installed directly
into the top socket marked “RELIEF
VALVE”. The drain line from this valve
must run in a continuously downward
direction in a frost-free ambient
position with the discharge end left
open to atmosphere permanently.
The PTR Valve is not intended to enable
connection of the water heater to
supplementary energy sources such as
solar panels or slow combustion stoves
(refer AS/NZS 3500.4 for guidance on
these types of installations).
After the cold water has been
connected, open the PTR Valve for
approximately 10 seconds by lifting
the lever on the valve to ensure water
is relieved to waste through the relief
drain pipe. Lower lever gently and
check that it closes correctly.
The PTR Valve must not be tampered
with or removed. The water heater
must not be operated unless this valve
is fitted and in working order.
The PTR Valve should be checked for
adequate performance or replaced at
intervals not exceeding 5 years, or less
in areas where local regulations apply.
Important:
The PTR Valve and its drain
outlet pipe must not be sealed or
blocked. It is normal for the PTR valve
to leak a small amount of water during
heating cycles.
Danger
Failure to operate the relief valve
easing lever at least once every six (6)
months may result in a problem with
the water heater and in some cases the
tank may explode.
Warning:
A separate drain line must
be run for this relief valve. It is not
permitted to couple drain lines from
relief valves into a single common
drain line.
Cold Water Connection
An approved isolating valve, non
return valve, line strainer (optional but
recommended), and union must be
fitted between the supply main and the
RP¾/20 socket marked INLET at the
bottom of the water heater. All fittings
must be approved by the relevant
Authority. See the diagram on page 4
for details.
Note for S.A. and W.A.:
It is a state
requirement that an expansion control
valve be fitted on the cold water
supply line between the non return
valve and the water heater. See the
diagram on page 4 for details.
