System Start-up
RT-SVX35H-EN
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
screw location. Turn the screw clockwise to increase
the gas pressure or counterclockwise to decrease the
gas pressure.
6. Use a CO
2
analyzer and measure the percentage of
carbon dioxide in the flue gas. Refer to the illustration
in
. Take several samples to assure that
an accurate reading is obtained. Refer to
the proper CO
2
levels. A carbon dioxide level
exceeding the range in
combustion due to inadequate air or excessive gas.
Air Volume Adjustment (O
2
)
7. Use an O
2
analyzer and measure the percentage of O
2
in the flue gas. Take several samples to assure an
accurate reading. Compare the measured O
2
level to
the combustion curve in
. The O
2
content of the flue gas should be 4 to 5%. If the O
2
level
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
2
and CO
2
levels after each adjustment.
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
2
analyzer and measure the percentage of CO
2
in the flue gas. Refer to the illustration in
. Take several samples to assure that an accurate
reading is obtained. Refer to
proper CO
2
levels. If the measured CO
2
level is within
the listed values, no adjustment is necessary. A CO
2
indicates
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
for the
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
for the adjustment screw location. Turn
the screw clockwise to increase the gas pressure or
counterclockwise to decrease the gas pressure.
Note:
Do not adjust the combustion air damper while the
furnace is operating at low-fire.
4. Check the CO
2
levels after each adjustment.
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
2
levels during furnace operation (see notes)
Furnace
Stage
MBH
Firing
Rate
Manifold
% CO
2
Pressure
High-Fire
235
100%
8.5-9.5
3.0-3.5
Low-Fire
117
50%
6.0-7.0
0.9
High-Fire
350
100%
8.5-9.5
3.0-3.5
Low-Fire
175
50%
6.0-7.0
0.9
High-Fire
500
100%
8.5-9.5
3.0-3.5
Low-Fire
250
50%
6.0-7.0
1.25
High-Fire
850
100%
8.5-9.5
3.0-3.5
Low-Fire
500
59%
6.0-7.0
1.25
High-Fire
1000
100%
8.5-9.5
3.0-3.5
Low-Fire
500
50%
6.0-7.0
1.25
Notes:
1.
Manifold pressures are given in inches w.c.
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
Summary of Contents for IntelliPak WEHE Series
Page 15: ...General Information RT SVX35H EN 15 Figure 1 Unit component layout and ship with locations...
Page 17: ...Installation RT SVX35H EN 17 Figure 2 Typical control module location...
Page 44: ...Installation 44 RT SVX35H EN Figure 27 Typical field power wiring for W_HE casings 2 through 6...
Page 56: ...Installation 56 RT SVX35H EN Figure 32 Wiring notes for CV controls...
Page 60: ...Installation 60 RT SVX35H EN Figure 35 Wiring notes VAV...
Page 68: ...System Start up 68 RT SVX35H EN Figure 38 Typical fenwall ignition control system...
Page 69: ...System Start up RT SVX35H EN 69 Figure 39 Typical Fenwall ignition control system...
