Fuel Tank Removal Kit; Water Connection - Truma Combi D 6 Installation Instructions Manual

Connecting the heater and metering pump to the fuel line
Mark the hole for leading through the fuel line (32 – in the
soundproofing hose) and the metering pump connector
cable (36) in a suitable location on the floor of vehicle.
Before drilling, always check for underlying/concealed
cables, fuel lines, frame sections and the like!
Then seal the edges of the openings in the floor of the vehicle
with underbody protection.
Route the fuel line (32) and the connector cable (36) of the
metering pump (27) so that they cannot chafe. Please also
use leadthrough bushings or edge protection profiles where
there are sharp edges such as metal panel leadthroughs.
Route pressure-side fuel line (32) in provided soundproofing
hose (33) made from cellular rubber.
Allowing the fuel lines to come into contact with vehicle
components or overtightening the cable binders may re-
sult in metering pump noise transmission (clicking).
Connect fuel line (32 – in soundproofing hose) to heater and
metering pump (27). Secure soundproofing hose (33) and
connector cable (36) to vehicle using hose holders (part no.
34020-76000) or attach loosely with cable binders (approx.
every 50 cm).
35
33
34
27
37
Figure 23
30 = Fuel line connection to unit
31 = Fuel hose 90° elbow
32 = Fuel line, inner diameter 2 mm (pressure line)
33 = Cellular rubber soundproofing hose
34 = Fuel hose
35 = Clamps
36 = Metering pump connecting cable
37 = Suction line from vehicle fuel supply

Fuel tank removal kit

The metering pump is connected to the vehicle fuel supply
using a vehicle-specific fuel tank removal kit.
Fuel tank removal kits available on request.

Water connection

Any pressure or immersion pump up to 2.8 bar can be used to
operate the boiler, as can any mixing battery with or without
an electric switch.
If the boiler is connected to a central water supply (rural or
urban connection) or if more powerful pumps are being used,
a pressure reducer must be used that will prevent pressures
higher than 2.8 bar from occurring in the boiler.
Before the pressure relief valve triggers, warming of the
water and its resulting expansion may cause pressures of
up to 4.5 bar to occur (also possible with immersion pumps).
The water pipes for connecting to the boiler and the safety/
drain valve must be drinking water safe, pressure resistant (up
to 4.5 bar) and hot water resistant up to +80 °C.
If using immersion pumps, a non-return valve (40, not included
in delivery) must be installed between the pump and the first
branch. Observe the direction of flow when installing the non-
return valve. (See figure 24 – Example of an installation with
flexible hoses Ø 10 mm).
47
36
Figure 24
30
When using pressure pumps with a high switching hyster-
esis, hot water can flow back via the cold water valve. We
31
32 recommend installing a non-return valve (40, not included
35
with the delivery) between the outlet to the cold water valve
and safety/drain valve as a return flow inhibitor. Observe the
direction of flow when installing the non-return valve. (See
figure 25 – Example of an installation with flexible hoses
Ø 10 mm).
47
Figure 25
Installation with flexible hoses (Ø 10 mm)
The elbow fittings (45 + 46) and the safety/drain valve (24)
have a connection with Ø 10 mm. All hose rubber connec-
tions must be secured with hose clamps (including the cold
water connection).
Installation with fixed duct routing (Ø 12 mm)
The elbow fittings (45 + 46) and the safety/drain valve (42)
have an inner connection of Ø 12 mm. We recommend the
use of John Guest ducts, insertion sleeves and locking rings.
Appropriate adapters are available for connecting ducts with
different diameters (not included in scope of delivery).
46
44
41
42
45
43
46
44
41
40
42
45
43
40
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