Fuel Tank Removal Kit; Water Connection - Truma Combi D4 CP plus ready Einbauanweisung

Connect heater and metering pump to fuel line
Mark hole for leading through fuel line (32 – in soundproofing
hose) and metering pump connecting cable (36) on floor of
vehicle in a suitable location.
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 fuel line (32) and connecting cable (36) of metering
pump (27) so that they will not 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
result in metering pump noise transmission (clicking).
Connect fuel line (32 – in soundproofing hose) to heater and
metering pump (27). Secure soundproofing hose (33) and
connecting 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
Fig. 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.
When connecting to a central water supply (regional or public
connection) or when powerful pumps are being used a pres-
sure reducer must be deployed to prevent pressures exceed-
ing 2.8 bar in the boiler.
Before the pressure relief valve triggers, warming of the
water and its resulting expansion may cause pressure of
up to 4.5 bar to occur (also possible with immersion pumps).
The water lines 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 installa-
tion with flexible hoses Ø 10 mm.)
36
30
Fig. 24
When pressure pumps with a large switching hysteresis are
31
being used, hot water can flow back via the cold water valve. We
32
recommend installing a non-return valve (40, not included with
35
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 – Exam-
ple of an installation with flexible hoses Ø 10 mm.)
Fig. 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 connections must
be secured with hose clamps (also in the cold water area).
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
42
47
45 43
46
44
40
42
47
45
43
41 40
41
19