Trane INTELLIPAK Installation Operation & Maintenance page 98

Table 4-7
Recommended Manifold Pressures and CO
during Furnace Operation (See Notes)
Furnace MBH Firing
Stage Rate
High-Fire 235 100%
Low-Fire 117 50%
High-Fire 350 100%
Low-Fire 175 50%
High-Fire 500 100%
Low-Fire 250 50%
High-Fire 850 100%
Low-Fire 500 59%
High-Fire 1000 100%
Low-Fire 500 50%
Manifold pressures are given in inches w.c.
High fire manifold pressure is adjustable on all heaters.
Low fire manifold pressure is non-adjustable on 235 MBH
and 350 MBH heaters.
Table 4-8
Natural Gas Combustion Curve
(Ratio of Oxygen to Carbon Dioxide in percent)
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Figure 4-8
Gas Valve Adjustment Screw Locations
Levels
2
Manifold
%CO2 Pressure
8.5-9.5 3.0-3.5
6.0-7.0 0.9
8.5-9.5 3.0-3.5
6.0-7.0 0.9
8.5-9.5 3.0-3.5
6.0-7.0 1.25
8.5-9.5 3.0-3.5
6.0-7.0 1.25
8.5-9.5 3.0-3.5
6.0-7.0 1.25
Curve Fuel
A = 1,000 BTU per cu. ft.
of Natural Gas.
A
Percent Oxygen
Figure 4-7
Flue Gas Carbon Dioxide & Oxygen Measurements
98