ADJUSTMENT
Gentherm Global Power Technologi
es
Page 42
NOTE:
Consult Data Plate Label Located on Inner Door for Reference Factory Fuel
Pressure.
3.
Tighten the lock nut and replace the cover on the fuel regulator.
8.1.2
Air-shutter Adjustment
Follow these steps to adjust the air-shutter:
1.
Check V
set
, see Power Output Evaluation Section 7, and record.
2.
Open the doors and loosen the lock-nut on the air-shutter adjusting screw.
3.
Turn the adjusting screw a quarter turn counterclockwise.
NOTE:
If the air-shutter adjustment is unknown and needs to be reset the following
procedure may be used for its initial positioning:
1.
Turn air adjusting screw counter clockwise until it is free from the Air
Lid. This will completely close off air intake.
2.
Turn air adjustment screw clockwise:
8.5 to 9 turns for natural gas.
6 to 8 turns for high BTU natural gas (P-5100H only)
22 to 23 turns for propane.
4.
This is generally a good starting point for air adjustment. After voltage has risen to a
stable point, further adjustments can be made with 1/4-turn adjustments.
5.
Close the doors, wait ten minutes then measure and record V
set
.
a.
If V
set
is greater than the original value
or did not change
, the burner
adjustment is air-rich, see Figure 21, turn the adjusting screw another quarter
turn counter clockwise and wait ten minutes. Continue until you observe a slight
decrease in V
set
then verify CO levels are below 800 ppm.
b.
If V
set
is less than original value
, the burner adjustment is fuel-rich, see
Figure 21. Notice that the peak of the graph is within one quarter of a turn,
either direction, of the adjusting screw. Set the adjusting screw so that it is one-
half turn clockwise, air-rich, verify CO levels are below 800 ppm.
6.
Tighten the lock-nut.
8.1.2.1
Measuring CO Emissions Levels
The model P-5100 will not produce excessive amounts of CO if properly adjusted. Due to the
open exhaust system of TEG, the CO measurement must be in the free air state. In a free
air measurement, the allowable CO rate is 800 ppm however a correctly adjusted P-5100 will
produce less than 120 ppm CO air free. To be able to determine the levels of air-free COppm,
a combustion analyzer capable of measuring COppm and either CO
2
percentage, or O
2
percentage, is needed.
The equations used to calculate the air-free stage of CO are:
