Filling The Hot Water System; Draining The Hot Water System; Electrical Operation 230 / 240 V - Option; Start-Up - Truma Combi 2 E Operating Instructions Manual

Filling the hot water system

Check whether the safety/drain valve is closed (see "Closing
the safety/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 safety/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 0.28 MPa from occur-
ring in the hot water system.

Draining the hot water system

If the motor home / caravan is not used during the
winter, the hot water system must be drained!
– Switch off the power to the pump assembly (main switch or
pump switch).
– Open hot water taps in kitchen and bathroom.
In order to check the water that is flowing out, place an
appropriate container (capacity 10 litres) beneath the
drainage socket (d) of the safety/drain valve.
– Open safety/drain valve
(see "Opening the safety/drain valve").
The hot water system is now drained directly to the outside
via the safety/drain valve. Check whether all of the water in
the hot water system (10 litres) has been drained into the con-
tainer via the safety/drain valve.
– No warranty claims for frost damage will be accepted.
Electrical operation 230 / 240 V – option –
To operate the electric heating element, please insert the plug
into the socket and then turn it on with the switch.
The electric heating element is operational when you can see
the mark (e) on the switch.
e
Fig. 4
6

Start-up

The use of the installed control panel is described in
separate operating instructions.
The interior can be heated in gas, electrical or mixed mode,
either with or without water, depending on the setting.
Check whether the power supply fuse protection at the camp
site is adequate for the 980 W (4.1 A) or 1960 W (8.1 A) that
have been selected.
The cable drum must be fully unwound in order to prevent the
power cable from overheating.
– Check to make sure the cowl is unobstructed. Be sure to
remove any covers that may be present.
– Open gas cylinder and quick-acting valve in gas supply line.
– Fill hot water system with water if necessary (see "Filling
the hot water system").
– Switch on heater at control panel.

Switching off

– Switch off heater at control panel.
– The switch-off procedure may be delayed by several min-
utes because of internal heater operations.
Always drain water if there is a risk of frost!
If the heater is not going to be used for a long period of time,
close the quick-acting valve in the gas supply line and turn off
the gas cylinder.

Maintenance

Only original Truma parts may be used for maintenance and
repair work!
The device must be descaled on a regular basis (at least twice
a year).
Servicing should be carried out only by authorised
personnel.
Please contact Dometic Service Centre for service and repairs.
Biofilm, deposits and limescale must be removed using
chemicals to protect the unit from infestation by microorgan-
isms. Only chloride-free products must be used in order to
prevent damage to the unit.
The effectiveness of the use of chemicals to combat micro-
organisms in the unit can be increased by heating the water
in the hot water system to 70 °C at regular intervals.
– Select "Gas" mode.
– Set water temperature to 60 °C.
– Switch on device.
Once the water in the hot water system has reached a
temperature of 60 °C, the burner will switch off. The unit
must stay switched on for at least 30 minutes and no warm
water may be removed. The residual heat in the heat exchang-
er will heat the water up to 70 °C.