Trane IntelliPak WEHE Series Installation, Operation And Maintenance Manual page 95

has a clearly defined shape, and is primarily (75%) blue
in color with an orange tip.
5. Check the manifold gas pressure by using the manifold
pressure port on the gas valve. Refer to
for the required manifold pressure for high-fire
operation. If it needs adjusting, remove the cap
covering the high-fire adjustment screw on the gas
valve. Refer to Figure 52, p. 96
screw location. Turn the screw clockwise to increase
the gas pressure or counterclockwise to decrease the
gas pressure.
6. Use a CO analyzer and measure the percentage of
2
carbon dioxide in the flue gas. Refer to the illustration
in Figure 50, p. 95. Take several samples to assure that
an accurate reading is obtained. Refer to
the proper CO levels. A carbon dioxide level
2
exceeding the range in
combustion due to inadequate air or excessive gas.
Air Volume Adjustment (O
7. Use an O analyzer and measure the percentage of O
2
in the flue gas. Take several samples to assure an
accurate reading. Compare the measured O
the combustion curve in
content of the flue gas should be 4 to 5%. If the O
is outside this range, adjust the combustion air damper
to increase or decrease the amount of air entering the
combustion chamber. Refer to
location of the combustion air damper.
8. Recheck the O and CO
2
After completing the high-fire checkout and
adjustment procedure, the low-fire setting may require
adjusting.
Low-Fire Adjustment (500 MBH, 850 & 1,000
MBH only)
1. Use the TEST initiation procedures outlined in the
previous section to operate the furnace in the low-fire
state (1st Stage).
2. Use a CO analyzer and measure the percentage of CO
2
in the flue gas. Refer to the illustration in
p. 95. Take several samples to assure that an accurate
reading is obtained. Refer to
proper CO levels. If the measured CO
2
the listed values, no adjustment is necessary. A CO
level exceeding the range in
incomplete combustion due to inadequate air or
excessive gas.
3. Check the manifold gas pressure by using the manifold
pressure port on the gas valve. Refer to
required manifold pressure during low-fire operation.
If it needs adjusting, remove the cap covering the low-
fire adjustment screw on the gas valve. Refer to
Figure 52, p. 96 for the adjustment screw location. Turn
the screw clockwise to increase the gas pressure or
counterclockwise to decrease the gas pressure.
RT-SVX35H-EN
Table 33, p. 95
for the adjustment
Table 33
Table 33 indicates incomplete
)
2
level to
2
Figure 51, p. 96. The O
2
2
Figure 54, p. 99 for the
levels after each adjustment.
2
Figure 50,
Table 33, p. 95 for the
level is within
2
Table 33 indicates
Table 33 for the
Note: Do not adjust the combustion air damper while the
furnace is operating at low-fire.
4. Check the CO
5. Press the STOP key at the Human Interface Module in
the unit control panel to stop the system operation.
Table 33. Recommended manifold pressures and CO
levels during furnace operation (see notes)
Furnace
Stage MBH
High-Fire 235
Low-Fire 117
High-Fire 350
for
Low-Fire 175
High-Fire 500
Low-Fire 250
High-Fire 850
Low-Fire 500
2
High-Fire 1000
Low-Fire 500
Notes:
1. Manifold pressures are given in inches w.c.
level
2. High fire manifold pressure is adjustable on all heaters.
3. Low fire manifold pressure is non-adjustable on 235 MBH and 350
MBH heaters.
Figure 50. Flue gas carbon dioxide & oxygen
measurements
2
2
System Start-up
levels after each adjustment.
2
Manifold
Firing
Rate % CO
2
100% 8.5-9.5
50% 6.0-7.0
100% 8.5-9.5
50% 6.0-7.0
100% 8.5-9.5
50% 6.0-7.0
100% 8.5-9.5
59% 6.0-7.0
100% 8.5-9.5
50% 6.0-7.0
2
Pressure
3.0-3.5
0.9
3.0-3.5
0.9
3.0-3.5
1.25
3.0-3.5
1.25
3.0-3.5
1.25
95