Water Connection; Mounting Of The Discharge Pipe; Installing Drain Valve - Truma Combi D 6 AU Installation Instructions Manual

Water connection

For operating the hot water system it is possible to use all
pressure pumps and submergible pumps up to 280 kPa, also
all mixing taps with or without electrical switch.
In order to guarantee complete emptying of the
water and to prevent pressures of greater than
450 kPa occurring in the hot water system, the en-
closed pressure reducer (40), the enclosed water con-
nectors (45 + 46) and the enclosed drain valve (42) must
be used!
When using pressure pumps with high switching hysteresis,
hot water may flow back through the cold water tap. To pre-
vent backflow, we recommend that a non-return valve (nrv –
not included in the scope of supply) be fitted between the
outlet to the cold water tap and the drain valve.
46
42
47
45
43
Fig. 24
The supplied water connectors (45 + 46) and drain valve
(42) have a 12 mm rigid piping connection (e. g. John
Guest System). For connecting to rigid pipes with other diam-
eters appropriate adapters (not included in scope of delivery)
must be used.
Hoses with a diameter of 12 mm that are drinking water com-
patible, pressure-resistant (up to 450 kPa) and hot water-re-
sistant up to +80 °C must be used to connect the unit and the
accessories. We recommend the use of John Guest pipes,
insertion sleeves and hose clamps.
As accessories Truma supplies the water connectors (45 + 46)
and drain valve (42) with a 10 mm / 3/8" diameter hose nipple.
Route water pipes as short as possible and free of kinks. All
pipe con nections must be secured (also cold water pipes)!
Before the drain valve triggers, warming of the water and its
resulting expansion may cause pressure of up to 450 kPa to
occur (also possible with immersion pumps).
When installing a water supply into the vehicle, please ensure
that there is an adequate distance between the water hoses
and the heat source (e.g. heater, warm air duct).
Hose clips SC (part no. 40712-01) are suitable for fastening
the pipes to walls or the floor. These hose clips also make it
possible to route water pipes on the heater's warm-air distri-
bution pipes as a way to avoid the danger of frosting.
A water hose may only be fitted at a clearance of 1.5 m to the
heater on the warm air duct. The Truma hose clip SC (part no.
40712-01) can be used if this distance is observed. In the case
of parallel installations, e.g. openings through a wall, a spacer
element should also be attached (e.g. insulation) to prevent
contact.
The included elbow fittings (45 + 46) must always be
used in order to completely empty the water and prevent
the water pipes on the unit from leaking over the long-term!
Elbow fitting (46 – with aeration valve) is connected to the
upper warm water connection; the second elbow fitting (45) is
connected to the lower cold water connection.
44
nrv
41
40
Route all water lines so they drop down to drain valve!
There shall be no guarantee claims for damage
caused by frost!

Mounting of the discharge pipe

The discharge pipe (Fig. 25 - 48) is to be installed
directly to the outside at a position protected against
splash water (apply splash guard, if necessary).
– There must be no tap, valve or other restrictions in
the discharge pipe.
– The discharge pipe must not be connected to other
piping.
– The discharge pipe must fall continously and free
of kinks from the P&T relief valve to the point of
discharge.
– The discharge pipe must not discharge into a safe
tray.
– Drill a hole with 22 mm diameter and pass through the dis-
charge pipe.
48
Ø 22 mm
Fig. 25

Installing drain valve

Install drain valve (42) at a place which is easily accessible,
near the hot water system. Drill a hole (18 mm diameter) in
the floor of the vehicle. Attach drain hose (42a) to drainage
socket, insert both through the floor and route outside. Fasten
drain valve with 2 screws (included with delivery).
Drain directly to the outside at a position protected against
splash water (apply splash guard, if necessary).
Ø 18 mm
Fig. 26
42
42a
9