EQUIPMENT DET
AILS
94
Filling the water heater
Check if the rotary switch for the drain valve
(FrostControl) is set to ‘Operation’, meaning
that it is parallel to the water connection
and engaged.
When the temperature at FrostControl is below
about 7° C, first switch on the heater to warm
the installation compartment and FrostControl.
After several minutes, when the temperature at
FrostControl is above 7° C, the drain valve can
be closed.
Close the drain valve by pushing the push
button until it engages. Switch on power for
water pump (main switch or pump switch).
Open hot water taps in kitchen and bathroom,
(set preselecting mixing taps or single-lever fittings
to ‘hot’). Leave the fittings open for as long as it
takes for the boiler to displace the air and fill up,
and the water to flow without interruption.
If just the cold water system is being operated,
without using the water heater, the heater tank
also fills up with water. To avoid frost damage,
the boiler must be drained through the drain
valve, even if it was not operated. As an
alternative, two shutoff valves, resistant to hot
water, can be fitted in front of the cold and hot
water connection.
When connecting to a central water supply
(rural or city mains), a pressure reduction valve
must always be installed to prevent pressures
above 2.8 bar from developing in the water
heater.
Draining the water heater
Switch off power to water pump (main or
pump switch).
Open hot water taps in kitchen and bathroom.
Turn the yellow boiler drain valve to the up
position to dump the water.
The boiler is now drained directly to the
outside via the drain valve. Place a bucket
beneath the outlet to check whether the
water content has completely drained away
(10 litres). There shall be no claims under
guarantee for damage caused by frost!
Maintenance
Only original Truma parts may be used for
maintenance and repair work!
The water container used is made of stainless
steel, which is foodstuff-compatible.
Use wine vinegar for descaling the water heater,
this being introduced into the appliance via the
water supply. Allow the product to react and
then thoroughly flush out the appliance with
plenty of fresh water. For sterilization purposes
we recommend ‘Certisil-Argento’; other
products (especially those containing chlorine)
are unsuitable and may damage the unit.
To avoid microorganisms colonizing the water
in the boiler, heat the water to 70° C at regular
intervals (at least once per year).
Move the rotary switch on the control panel
to position (c – summer operation) 60° C. The
green (b) and yellow (g) LEDs light up.
Once the water in the boiler has reached a
temperature of 60° C, the burner will switch
off and the yellow LED (g) will go out. The unit
must stay switched on for at least 30 minutes
and no warm water may be removed. The
residual heat in the heat exchanger will heat
the water up to 70° C.
Fuses
The unit’s fuse is located on the electronics
under the connection cover. Replace the unit’s
fuse only with an identical fuse.
Device fuse: 10 A – slow – (T 10 A)
TRUMA COMBI 4E
