Gentherm 5220 - Troubleshooting

28142 Rev 15 MAINTENANCE
Gentherm Global Power Technologies Page 54
The following spare parts should be available for routine servicing:
• 1 - Fuel filter kit, P/N 22363
• 1 - Fuel orifice: for natural gas use orifice #8, P/N 40069, for propane use orifice #10,
P/N 6251.
• 1 - SI Ignition Control Battery pack, P/N 24559*
• 1 - Spark electrode, P/N 58496*
• 1 - Thermal Cutoff assembly, P/N 300074*
*items not usually required but could be convenient for troubleshooting.
The above spare parts can be purchased as a bundle for simplicity:
• 1 - Spare parts kit: for natural gas 5220 TEGs, P/N 58755, for propane 5220 TEGs, P/N
67267
Evaluate V
set
This procedure describes how to interpret V
set
and determine what further service is required.
Follow these steps:
Check V
set
as per Power Output Evaluation (Section 7) and record in the log.
Compare measured voltage with required V
set
for present ambient temperature and
proceed as follows:
a) If measured voltage is more than 0.2 V above required V
set
:
The fuel pressure must be reduced. Proceed with Routine Service, Section 9.1.3.
Remember to adjust the fuel pressure during restart or before leaving the site.
See Adjustment (Section 8).
CAUTION!
Do not continue operating the TEG with measured V
set
exceeding the required V
set
f
or present ambient
temperature, otherwise overheating may cause
irreparable damage to the power unit.
b) If measured voltage is within 0.2 V of required V
set
:
The TEG is functioning well and requires only a routine check. Proceed with
Routine Service.
c) If measured voltage is more than 0.2 V below required V
set
:
The cause must be determined. Refer to the last entry in the TEG Performance
Log. In the log, check if the TEG was left operating at the correct V
set
during the
last service visit. Remember that V
set
changes with ambient temperature. If the
TEG was not left operating at the correct V
set
during the last service, determine
the reason for this. If the TEG was left operating at the correct V
set
during the last
visit and the voltage has changed, consider the following probable causes: