Gas Connection; Water Connection - Truma Combi Einbauanweisung

Gas connection

The 30 mbar operating pressure of the gas supply must
correspond to the device's operating pressure (see type
plate).
The ducts must be routed in such a way that the device is
easy to remove for service work.
The gas supply line (Ø 8 mm) must be attached to the gas
connection muff (20) with an olive screw fitting (19 – included
with delivery depending on version). Carefully counterhold
with another wrench when tightening.
The gas connection muff (20) on the device may not be short-
ened or bent.
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Figure 13
Before connecting to the device, please ensure that the gas
ducts are free of dirt, shavings and the like.
The number of separation points in the gas supply line in
rooms used by persons must be limited to the technical
minimum.
The gas system must comply with the technical and admin-
istrative regulations of the respective country of use (e.g.
EN 1949 in Europe).
The national legislation and regulations (e.g. DVGW Work
Sheet G 607 for vehicles in Germany) must be observed.

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 powerful pumps are being used, a
pressure reducer must be used, which will prevent pressures
higher than 2.8 bar from occurring.
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.
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If using immersion pumps, a non-return valve (21 – not in-
cluded in delivery) must be installed between the pump and
the first branch. Observe the direction of flow when install-
ing the non-return valve. (See figure 14 – Example of an in-
stallation with flexible hoses Ø 10 mm.)
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Figure 14
When using pressure pumps with a high switching hyster-
esis, hot water can flow back via the cold water valve. We
recommend installing a non-return valve (22 – not included
in delivery) between the outlet to the cold-water valve and
the safety/drain valve as a return flow inhibitor. Observe the
direction of flow when installing the non-return valve. (See
figure 15 – Example of an installation with flexible hoses
Ø 10 mm.)
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Figure 15
Installation with flexible hoses (Ø 10 mm)
The elbow fittings (27 + 28) 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 (27 + 28) and the safety/drain valve (24)
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).
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