28142 Rev 15 ADJUSTMENT
Gentherm Global Power Technologies Page 43
Air-shutter Adjustment
At this point, adjusting the air shutter for optimum combustion may be necessary (see Figure
23). The generator should be stable, with the V
set
voltage constant.
WARNING!
Air shutter components are very
exposed skin. Make all air shutter adjustments using
tools or wearing gloves only - not with bare hands.
There are two methods by which the air shutter can be adjusted: one using a combustion
analyzer, and one using a meter.
WARNING!
If the air shutter on the 5220 is closed too far, the
flame will move up to the exhaust. A flame in the
exhaust is visible in the gap between the exhaust
stack and the burner. A flame in the exhaust c
an is
unsafe for several reasons and results in unstable
combustion and low power output
air shutter too far to prevent a flame in the exhaust.
Air Shutter Adjustment Using a Meter
If a combustion analyzer is unavailable, the air shutter can be set using a volt meter reading
to an accuracy of ±0.1V.
To adjust the air shutter using a meter:
Disconnect the customer load by opening the customer-installed circuit breaker or
fuse, isolating the TEG from any batteries, loads, or other voltage sources.
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.
Mark the original position of the air shutter with a felt pen against the burner cover.
Loosen the four screws mounting the air screen against the air shutter, leaving the
air shutter still in place.
Open the air shutter slightly by rotating the shutter to enlarge the opening. Adjust the
shutter only a small amount at a time. There will be a slight resistance to air shutter
movement as the air shutter is still being held against the venturi by four screws.
Wait 15-20 minutes for the TEG to stabilize, then measure V
set
again.
If V
set
is greater than the required value (±0.2V), repeat steps 3 and 4. Continue to
open the shutter until V
set
decreases, then rotate the shutter to the position that gave the
highest V
set,
and tighten screws A and B.
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