4
H3699 Rev. L
Thermann Owner’s Manual
thermann 25/50 Litre Water Heater
Plumbing Connections
Pressure & Temperature Relief Valve
the Pressure & temperature Relief
Valve is supplied loose with the water
heater.
Please refer to the specifications
table on page 7 for the valve ratings.
the PtR valve must be installed
directly into either of the top sockets
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).
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.
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.
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
with blue surrounds at the bottom of
the water heater. all fittings must be
approved by the relevant authority.
See the diagram on page 5 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 5 for details.
