4
Pressure and Temperature Relief Valve
(P&T safety valve)
Risk of scalding injury from hot water and/or tamper-
ing with the P&T safety valve!
– Do not actuate the P&T safety valve as long as the
appliance is still hot.
– Do not place a plug or reducing coupling in the
discharge pipe (Fig. 2a - 4b) of the P&T safety valve.
– Do not operate the water heater without a
functioning P&T safety valve - this could cause an
explosion.
The P&T safety valve (4) is a safety component and must
not be removed for any reason other than replacement.
The P&T safety valve is not serviceable; if defective it must be
replaced (failure to reuse an old P&T safety valve). It must be
replaced by a certified service technician.
Tampering with the P&T safety valve will void the warranty.
close
open
4
4b
4a
Fig. 2a
4
P&T safety valve
4a Test
lever
4b Discharge
pipe
Draining the water heater
If the vehicle is not used during periods of frost, it is es-
sential that the Truma UltraRapid HWS be emptied.
– Disconnect power for water pump (main switch or pump
switch).
– Allow the appliance to cool down.
– Open hot water taps in bathroom and kitchen.
– Open drain valve (Fig.2 - 3).
Lever in the “f” position (drain).
The water heater is now drained directly to the outside via
the drain valve (3).
– Check that the water has been completely drained (14 litres).
Always observe the operating instructions prior to
starting!
The vehicle owner is responsible for correct opera-
tion of the appliance.
Before using the product for the first time, it is essen-
tial to flush the entire water supply through with clean
warm water. Always mount the cowl cap when the water
heater is not being operated! Drain the water heater if there is
a risk of frost!
Warranty claims will not be accepted for frost
damage.
Always remove the cowl cover prior to operating the
water heater!
If connecting to a central water supply (rural or city connec-
tion) or when using more powerful pumps, a pressure reduc-
er must be used which prevents pressures of greater than
400 kPa occurring in the Truma UltraRapid HWS.
Filling the Truma UltraRapid HWS with water
Check that the drain valve (3) and the P&T safety valve (Fig.
2a - 4) in the cold water intake are closed.
– Close drain valve (Fig. 2 - 3).
Lever in the “e” position (close).
– Test lever (Fig. 2a - 4a) of the pressure relief valve (4) must
be in the “close” position.
e
e
f
e = close
f = drain
3
Fig. 2
– Open hot tap in bathroom or kitchen, with pre-selecting
mixing taps or single-lever fittings set to “hot”.
– Switch on power for water pump (main switch or pump
switch).
– Leave the tap open to let air escape while the water heater
is filling. The heater is filled when water flows out of the tap.
Residues of frozen water can prevent filling if there is a frost.
The water heater can be defrosted by switching on the heater
for a short period (max. 2 minutes). Frozen pipes can be de-
frosted by heating the room.
If just the cold water system is being used, without
water heater, the heater tank is also filled up with wa-
ter. In order to avoid damage through frost, water must be
drained by means of the drain valve, even if the heater has
not been used. As an alternative, two shut-off valves, resistant
to hot water, can be fitted in front of the cold and hot water
connection.
Operating instructions
Содержание UltraRapid
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