5
Maintaining
the Hot Water
Heating System
The hot water heating system
is filled with a mixture of
40 % glycol (in a similar
manner as for motor vehicle
engines, but not Diesel
engines) and 60 % water. In
cases of ambient temperatu-
res of less than -25°C, the
glycol content may be in-
creased up to a maximum
of 50 %.
The heating water should be
changed about every two
years, since important pro-
perties such as corrosion pro-
tection will become ineffec-
tive.
The level of the liquid in the
expansion container must be
checked regularly. The level
of the liquid should be about
1 cm above the „MIN“ mar-
king when the heating sy-
stem is cold.
Expansion vessel
f = Filling level of the heating
water
g = Cover for topping up the
heating water
h = Circulating pump
j = Direction of run of the
circulating pump
(anti-clockwise)
Caution: Before topping up,
the glycol content is to be
checked in order to avoid too
high a proportion of glycol.
Topping up is carried out via
the expansion container. To
do this, open the cover (g) of
the expansion container. Add
the heating water slowly
until the level of the liquid (f)
is about 1 cm above the
„MIN“ marking.
If the liquid level drops more
than is anticipated given the
normal rate of evaporation,
the system must be checked
for leaks (rubber connections,
drain cock, bleeding valves,
etc.). Flush away any water
containing glycol which may
have leaked out by using
fresh water, and dry carefully.
Bleeding the hot
water heating system
Depending on how the hea-
ting system is installed, there
may still be air in the system
after filling (or topping up).
Air in the system will be ap-
parent either due to noises in
the expansion container or
due to unsatisfactory heating
performance. If the heating
performance is inadequate,
the heating water cannot cir-
culate and the system will
only heat up in parts.
1. Heat up the Aquatherm sy-
stem.
2. Before bleeding the hea-
ting system, shut down the
circulating pump by swit-
ching the heating system off.
3. Next, open the bleeding
valves one after another until
no more air emerges (the ar-
rangement of the bleeding
valves depends on the instal-
lation. Please consult the
operating instructions for
your vehicle for more details).
4. Switch the heating system
on again and check whether
the entire system is heating
up.
Repeat the procedure if
necessary.
Tip: If there is still air in the
system after repeat bleeding,
the air can be made to rise
upwards by setting the ve-
hicle at an angle (e.g. on a
street with a pronounced gra-
dient or by means of a jack).
Park the vehicle in this positi-
on, wait a few moments, and
then open the bleeding valve
at the highest point until no
more air emerges. Then set
the vehicle at an angle in the
other direction, and repeat
the bleeding process at the
topmost point.
Note: For professional use in
workshops, we recommend
the use of a special bleeding
device (available from Truma)
for clean and simple bleeding
of the heating system.
The heating fuse is located
on the electronic control cir-
cuit board of the device.
The fine-wire fuse located on
the electronic control circuit
board may only be replaced
by a fuse of the same design
(1.25 A slow-acting fuse,
IEC 127/2-III).
Technical Data
Gas type: Liquid gas
(propane/butane)
Operating pressure:
30 mbar, (or 28 mbar butane/
37 mbar propane)
Rated thermal output:
1900 W
Gas consumption: 140 g/h
Heating water content:
10 litres
Max. water pressure:
0.5 bar
Current consumption at
12 V Heating system
Ignition: 0.17 A
Heating up: 0.08 A
Stand-by: 0.04 A
Circulating pump: Max. 1 A
Current consumption
230 V at power stage
500 W: 2.2 A
1000 W: 4.5 A
2000 W: 8.7 A
Weight (without contents)
Aquatherm: Approx. 6,8 kg
Aquatherm EL: Approx. 7,5 kg
Conformity Declaration:
The Truma-Aquatherm hea-
ting system has been proto-
type-tested by the DVGW
and fulfils the requirements
of the EC Gas Appliance
Directive (90/396/EEC) and
the jointly-applicable EC
Directives. The CE Product
Identity Number for EU
countries has been issued:
CE-0085BL0190
General design approval
by the Federal Motor Ve-
hicle Bureau: S 326
General safety notes
In event of leaks in the
gas system or if there is a
smell of gas:
- extinguish all naked
flames!
- do not smoke!
- switch off the appliances!
- shut off the gas cylinder!
- open the windows!
- do not actuate any elec
trical switsches!
- have the entire system
checked by an expert.!
1. Repair jobs are only to
be carried out by an ex-
pert.
2. Any alteration to the appli-
ance (including exhaust duct
and cowl) or the use of spare
parts and accessories which
are important for the functio-
ning of the heater and which
are not original Truma parts,
as well as the non-observan-
ce of the installation and ope-
rating instructions, shall lead
to the cancelling of the gua-
rantee and exclusion of liabili-
ty claims. It also becomes il-
legal to use the appliance,
and in some countries this
even makes it illegal to use
the vehicle.
3. The operating pressure
for the gas supply is
30 mbar (or 28 mbar buta-
ne/37 mbar propane) and
must correspond to the
operating pressure of the
appliance (see name
plate).
4. In Germany only, liquid
gas installations must comply
with the DVGW form G 607
for motor vehicles or G 608
for water sport vehicles.
The gas system must be
tested every 2 years by a li-
quid gas expert (DVFG, TÜV,
DEKRA). This inspection
must be confirmed on the
test certificate in accordance
with the DVGW-form G 607
or G 608.
The vehicle owner is
always responsible for
arranging the inspection.
5. In other countries the re-
spectively valid regulations
must be observed. For your
own safety it is absolutely ne-
cessary to have the com-
plete gas installation regularly
checked by an expert (every
2 years at the latest).
6. Do not operate the water
heater when refuelling the
vehicle and when in the
garage.
7. During the initial operation
of a brand new appliance (or
after it has not been used for
some time), a slight amount
of fumes and smell may be
noticed for a short while. This
can be remedied by running
the heater at maximum out-
put and ensuring adequate
room ventilation.
For the gas system only gas
pressure regulators with pro-
tection against excess pres-
sure, such as regulators with
safety valves according to
DIN 4811 and VP 306, may
be used. We recommend the
Truma DUB vehicle regulator
