Water Connection; Flexible Hose Installation; Rigid Duct Installation Using The John Guest System; Installing The Drain Valve - Truma BG 10 Installation Instructions Manual

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 connected to a central water supply (rural or urban con-
nection), or if more powerful pumps are being used, a press-
ure reducer must be used, which will prevent pressures high-
er than 2.8 bar from occurring in the system.
If using immersion pumps, a non-return valve (10 – not in-
cluded in scope of delivery) must be installed between the
pump and the first branch (arrow indicates flow direction).
12
13
Figure 6
When pressure pumps with a large switching hysteresis are
being used, hot water may flow back via the cold water valve.
We recommend installing a non-return valve (11 – not in-
cluded in scope of delivery) between the outlet to the cold
water tap and the drain valve as a return flow inhibitor.
12
13
Figure 7
In order to ensure that all the water is drained from the
boiler and that all water connections are leak-tight, the
water connections (12 + 13) and the drain valve (14) must
always be used.

Flexible hose installation

Truma can supply the water connections (12 + 13) and the
drain valve (14) with hose connection, diameter 10 mm, as
accessories.
Pressure-resistant (up to 4.5 bar), hot water-resistant (up to
+80 °C) , food-safe water hoses with an inner diameter of
10 mm must be used.
Water hoses must be as short as possible and free of
kinks. All hose rubber connections must be secured
with hose clamps (including the cold water connection). The
warming of the water and its resulting expansion may gener-
ate pressures of up to 4.5 bar in the drain valve (also occurs
with immersion pumps).
Route all water lines so they slope downwards to the
drain valve. Otherwise there is a risk of frost damage
that is not covered by the warranty!
10
10
14
11
14
Rigid duct installation using the John Guest
system
Truma can supply the water connections (12 + 13) and the
drain valve (14) with a diameter of 12 mm as accessories. In
this case it is advisable to always use John Guest pipes, inser-
tion sleeves and locking rings.
Suitable adapters (not included in scope of delivery) must be
used for connecting rigid pipelines with a different diameter.
Route all water lines so they slope downwards to the
drain valve. Otherwise there is a risk of frost damage
that is not covered by the warranty!

Installing the drain valve

Fit drain valve (14) in an easily accessible location in the vicin-
ity of the boiler. Drill hole with diameter of 18 mm and insert
the drainage socket with hose (15). Secure the drain valve in
place with 2 screws. Water removal can take place directly to
the outside in a splash-protected location (fit splash guards if
necessary).
Ø 18 mm
Figure 8

Water line routing

Connect cold water supply (16) to drain valve (14). The direc-
tion of flow is irrelevant.
12
20 13 22
Figure 9
Push elbow fitting without aeration valve (13) as far as poss-
ible onto the boiler's cold water connection tube (lower tube),
and push the elbow fitting with built-in aeration valve (12) as
far as possible onto the boiler's hot water connection tube
(upper tube). Pull in the opposite direction to check that the
elbow fittings are securely attached.
Slide venting hose with an outer diameter of 11 mm (20) onto
the hose nozzle of the aeration valve (21) and route to the out-
side free of kinks. Radius of arc must not be less than 40 mm.
14
15
23
14 16