NGW 300 / LGW 300 / GBW 300
9 Repair
901
9
Repair
9.1
General information
This section describes the permissible repair work when
the heater is disassembled. If there is any further disas-
sembly, any claim to a guarantee is extinguished. Only
Spheros replacement parts must be used for reassembly.
CAUTION
The ignition spark generator is operated with high voltage.
The following components must also be replaced when
the heater is in its installed state, if there is enough space
available:
•
Temperature limiter
•
Regulating thermostat
•
Control unit
•
Burner head
Before replacement, the heater must be switched off via
the main switch and the wiring harness connector in the
vehicle must be disconnected. Otherwise, there is a dan-
ger of death.
9.1.1 Measures for components when the
system is disassembled
ATTENTION
All sealing elements between the disassembled compon-
ents must be fundamentally eliminated and renewed. Be-
fore reassembly, the sealing surfaces must be cleaned
and sealant residue must be removed.
9.1.1.1 General visual inspection
•
Examine all components or damage (cracks, defor-
mation, wear etc.) and replace, if necessary.
•
Examine plugs and lines for corrosion, loose connec-
tions, crimping faults etc. and repair, if necessary.
•
Examine plugs for corrosion and connectors to make
sure that they are firmly attached and repair, if neces-
sary
9.1.1.2 Visual inspection of the combustion chamber
•
Examine the combustion chamber for scaling and re-
pair, if necessary.
•
Examine the welded seam for cracks and repair, if ne-
cessary.
PLEASE NOTE
Cracks in the welded seam of up to 80 mm in the
longitudinal direction at the end of the combustion
chamber are permissible.
9.1.1.3 Visual inspection of the heat exchanger
•
Examine the exhaust gas routing in the heat exchanger
for damage and corrosion and repair, if necessary.
•
Examine the exhaust gas muffler in the exhaust con-
nector to make sure it is securely attached and for
thermal deformation and repair, if necessary.
PLEASE NOTE
Severe thermal deformations of the exhaust gas muffler
affects combustion.
•
Check the heat exchanger for external damage and
deformations etc. and repair, if necessary.
PLEASE NOTE
Severe deformations can compromise the coolant flow.
9.1.2 Implementation of modifications
PLEASE NOTE
Constant further development of the heaters means that
their performance is being optimised with the goal of
avoiding acciidents or malfunctions.
As a rule, heaters which are already in the field can be re-
trofitted. There are appropriate modification kits available
for this purpose.
Below are modifications which can be carried out in the
context of repair work.
•
Installation of the SG 1585 control unit as a replace-
ment for the SG 1578 control unit for the NGW 300
and LGW 300 (see 9.1.2.1)
•
Installation of the U 4851 or Aquavent 6000 S circula-
ting pump as a replacement for the U 4814 or U 4816
circulating pump (see 9.1.2.2)
