Thermann Owner’s Manual
4 Star Gas Hot Water Heater
5
H4127 Rev. B
Plumbing Connections
Pressure & Temperature Relief Valve
The Pressure & Temperature Relief
Valve is supplied loose with the water
heater. The valve rating is:
All Models – 1400kPa
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).
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
either of the RP¾/20 sockets marked
“INLET” at the bottom of the water
heater. All fittings must be approved
by the relevant Authority. See the
diagram on page 6 for details.
Note:
Brass plugs are supplied with
the water heater to plug off the
unused fittings. Ensure that a sealing
material is applied to the plugs to
prevent leaking.
Note for S.A. and W.A.:
It is a state
requirement that a 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 6 for details.
