9
Water connection
All pressure and submergible waterpumps can be used for
operating the water heater.
In order to guarantee complete emptying of the
water and to prevent pressures of greater than
400 kPa occurring in the Truma UltraRapid HWS, the
enclosed pressure reducer (10), the enclosed water con-
nectors (12 + 13) and the enclosed drain valve (14) 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.
Fig. 13
The supplied water connectors (12 + 13) and drain valve
(14) have a 12 mm rigid piping connection (e. g. John
Guest System). For connecting to rigid pipes with other diam-
eters appropiate adapters (not included in scope of delivery)
must be used.
As special accessories Truma supplies the water connectors
(12 + 13) and drain valve (14) with a 10 mm / 3/8" diameter
hose nipple (please refer to page 12).
Route water pipes so that they are as short and free of
kinks as possible (hose connections must be secured
using hose clamps – also for cold water! – pressures of up
to 400 kPa can occur in the drain valve – also with
submergible pumps – because of the heat of the water and
the resulting expansion).
All hot water pipes should be routed in a descending
manner to the drain valve! Otherwise there is no guar-
antee of protection from frost!
Insert heater with cowl body (1) through the wall cutout (2),
allow approx. 5 mm to project out of the wall. Mount sealing
frame (3 – the anti-twisting device ensures correct fitting!).
Pre-drill holes for the 6 fastening bolts (4).
Fig. 10
Remove sealing frame (3) and coat with non-hardening
mastic on the side facing the vehicle – do not use silicone!
The sealing frame must be well sealed with respect to
the front sides and the cross bars of the cowl body (1)
as well as towards the outside wall!
Fasten sealing frame (3) to the cowl body using 4 self-tapping
screws (4).
4
3
Fig. 11
Screw the sealing frame (3) together with the cowl
body (1) so the anti-twist device projects.
Fig. 12
Seal the gap between the hole (6) and the condensation tube (7)
with non-hardening mastic – do not use silicone!
Mount the grille (8). Press the entire cowl assembly onto the
vehicle wall and fasten with 6 screws (5).
Screw the Truma UltraRapid HWS securely to the floor of the
vehicle with at least two shackle plates (9) with the screws
provided, B 5.5 x 25, on suitable base (plywood panel, lami-
nated wood strips or metal base).
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