28142 Rev 15 ADJUSTMENT
Gentherm Global Power Technologies Page 42
Follow these steps to adjust fuel pressure:
Isolate the TEG from the station battery, load, and other voltage sources by opening
the circuit breaker or fuse connecting the customer load to the TEG.
Check that the jumper clip on terminal block TB-1 is in the SETUP position (between
terminals 2 and 3). Move the jumper clip if necessary.
Measure the voltage across terminals 2 (+) and 4 (-) with a multimeter. This voltage
is V
set
. If V
set
is below the required value for the present ambient temperature, the
TEG is under-fired and requires more fuel. If V
set
is above the required value for the
present ambient temperature, the TEG is over-fired and requires less fuel.
Remove the cover on the regulator and loosen the lock nut.
Turn the adjusting screw to increase (clockwise) or decrease (counter-clockwise) fuel
pressure.
Wait 20-30 minutes for the TEG to stabilize, then check V
set
again. If V
set
is within
0.2V of the required value, no further adjustment is required. If V
set
is further than
±0.2V from the required value, repeat steps 5 and 6 until the required voltage is
attained.
Tighten the lock nut (1/2” Hex) and replace the cover on the fuel regulator.
WARNING!
Do not exceed the fuel pressure stamped on the TEG
data plate without factory approval. If fuel pressure
exceeds reasonable levels, the power unit may be
seriously and permanently damaged.
The thermopile in a TEG is very sensitive to temperature. There is a very serious risk of
permanent damage to the power unit and a drastic reduction in the TEG’s longevity if normal
fuel pressures are exceeded. When setting up a TEG, take extreme care not to turn the
fuel pressure up too high. If you are unsure of the fuel pressure you should be
using, contact GPT for assistance.
It is also important to note that if your gas composition is different from the fuel specification
at the beginning of this manual, fuel pressure must be adjusted accordingly.
NOTE:
The TEG will require some time to stabilize after either air or fuel adjustments
are made. Wait 20-
30 minutes between readings while adjusting fuel
pressure.
NOTE:
Consult the Data Plate Label (located on the inside of the cabinet door) for
Reference Factory Fuel Pressure. See Figure 23 for Data Plate location.
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