11
Electrical connections
Route connecting cables in such a way that they cannot
chafe. Please also use leadthrough bushings or edge protec-
tion profiles where there are sharp edges such as metal panel
leadthroughs. The connecting cables must not be attached to
or come into contact with metal surfaces, the exhaust duct or
warm air ducts.
The electrical connections are located under the connection
cover (60). The cover can be removed by pressing and simul-
taneously sliding it in the direction of the arrow. When remov-
ing or installing the connection cover on the connection ca-
bles, make sure that the cables are not pulled out or become
pinched.
64
ASGZUCB JE
Raumfühler
Fensterschalter
10AT
FC
20AT
BEDIENTEIL
DIAGNOSE
open
60
Fig. 31
61 = input voltage +12 V (spade connector 6.3 mm)
62 = input voltage ground (spade connector 6.3 mm)
63 = not used
64 = device fuse: 10 A – slow – (T 10 A)
65 = wire bridge (or window switch – accessory)
66 = not used
67 = room temperature sensor
68 = control panel / diagnostic connector*
69 = control panel / diagnostic connector*
70 = metering pump
71 = burner fuse 20 A (slow-acting) 6.3 x 32 mm
72 = extractor fan
73 = burner diagnostic connector
* Alternative connections.
Fig. 32
All connections to the unit should be made with sagging
connection cables. This will prevent condensation water from
running down the connection cables and into the unit.
The connecting cables and plugs must not be subjected to
force. Bundle connecting cables (see figure) and secure each
one to housing using a cable binder in order to provide strain
relief.
Fig. 33
All cables must be securely attached and must not become
loose or disconnected due to vibration – risk of fire!
Connection 12 V
Electric cables, switching units and control units for heaters
must be arranged in the vehicle in such a way that their satis-
factory operation cannot be adversely affected under normal
operating conditions. All cables leading to the outside must
be splash proof at the leadthrough opening.
Prior to working on electric components the appliance must
be disconnected from the power supply. Swit ching off at the
control panel is not sufficient!
When carrying out electric welding work on the body, the
appliance connection must be disconnected from the vehicle
electrical system.
The unit is equipped with reverse polarity protection. If
the unit is connected with incorrect polarity, there will be
no display on the LED. The unit can be used after establishing
proper polarity and replacing the fuse (64).
The heater requires a constant 12 V supply. The connection
should be made via a minimum of 6 mm cross section low
voltage cable direct to the 12 V battery terminals, both pos-
itive and negative. The positive and negative leads must be
fused with a 12 V – 20 A fuse.
If fitting an isolation switch, the switch must be installed in
such a position that the heater cannot be switched off un-
intentionally. The heater must always be turned off at the
heater control. The 12 V isolation switch should only be used
after the heater has completed its cool down cycle and has
stopped completely.
Do not connect any other consumers to the supply line!
When power packs or power supply units are being used,
note that the output voltage is between 11 V and 15 V
and the alternating current ripple is < 1.2 Vpp.
Connecting room temperature sensor to the unit
Plug the connection cable’s plug onto connection (67)
(no need to observe polarity).
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