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Operating instructions
Read the safety instructions and operating manual care-
fully before starting the unit.
Operating instructions can be viewed in offline mode
with a mobile device and the Truma App. Download the
operating instructions when you have a WiFi connection and
save them on your mobile device.
Before using for the first time, it is essential to flush
the entire water supply system with clean water. If the
heater is not being used, always drain the water if there is a
risk of frost. No warranty claims for frost damage will be
accepted.
Control panels
The control panels are described in a separate operating
instruction.
Room temperature sensor
To measure the room temperature, an external room tempera-
ture sensor (2) is located in the vehicle. The position of the
sensor is determined by the vehicle manufacturer, depending
on the vehicle model. More information can be found in the
operating instructions for your vehicle.
Fig. 2
The temperature setting on the control panel depends on per-
sonal heating requirements and the design of the vehicle, and
must be determined individually.
Drain valve
The drain valve automatically equalises the pressure in the
event of overpressure in the system. When this occurs, the
water is drained to the outside in intermittent bursts via a
drainage socket.
This drain valve does not protect the water container
from frost damage.
a
Fig. 3
a = Lever in position "Operational – closed"
b = Lever in position "Operational – closed"
c = Lever in position "Drain"
d = Drainage socket (led outside through floor of vehicle)
Opening the drain valve
– Move lever to position (c) – vertical. The water from the hot
water system drains through the drainage socket (d).
The drainage socket (d) of the drain valve must be free of
blockages (slush, ice, leaves, etc.) at all times so the water
can drain easily! No warranty claims for frost damage
will be accepted.
Closing the drain valve
– Move lever to position (a) or (b) – horizontal.
6
2
c
b
d
P&T relief valve
(Pressure and temperature relief valve)
Risk of scalding injury from hot water and/or tamper-
ing with the P&T relief valve!
– Do not actuate the P&T relief valve as long as the
appliance is still hot.
– Do not place a plug or reducing coupling in the dis-
charge pipe (Fig. 3a - 19a) of the P&T relief valve.
– Do not operate the water heater without a
functioning P&T relief valve.
The P&T relief valve (19) is a safety component and must
not be removed for any reason other than replacement.
The P&T relief valve is not serviceable; if defective it must be
replaced (failure to reuse an old P&T relief valve). It must be
replaced by a certified service technician.
Tampering with the P&T relief valve will void the warranty.
19a
Fig. 4
Filling the hot water system
Check whether the drain valve is closed (see "Closing the
drain valve").
– Switch on the power for the water pump (main switch or
pump switch).
– Open hot water taps in kitchen and bathroom, (set prese-
lecting mixing taps or single-lever fittings to "hot"). Leave
the fittings open for as long as it takes for the hot water
system to displace the air and fill up and the water to flow
without interruption.
If only the cold water system is being operated without
the hot water system, the hot water system also fills up
with water. To avoid frost damage, the hot water system must
be drained via the drain valve, even if it was not operated.
In the event of frost, filling may be prevented by residual wa-
ter that has frozen. The hot water system can be thawed out
again by briefly starting it up (max. 2 minutes). Frozen lines
can be thawed out by heating up the interior.
If connected to a central water supply (rural or urban
connection), a pressure reducer must be used, which
will prevent pressures of greater than 280 kPa from occurring
in the hot water system.
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