RT-SVX072A-EN
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Table 55.
Recommended manifold pressures and O2 levels for furnace operation — natural gas (continued)
Burner size
Low Fire (1%)
High Fire (100%)
O2 (%)
Manifold
(in. w.c)
O2 (%)
Manifold
(in. w.c)
1000 MBH 2-stg
4.9 – 5.1
0.65 – 0.67
2.8 – 3.2
2.5 – 2.7
1000 MBH Mod
11.2 – 11.4
0.01 – 0.02
2.8 – 3.2
2.5 – 2.6
Note:
If the manifold pressure is not within the range shown on the chart, then the combustion fan speeds (P0, P1, and/or P2) need
adjustment. Typically, in increments of 20-40 RPM
(a)
800MBH is Horizontal Discharge. MBH is listed on gas heat rating plate.
Table 56.
Recommended manifold pressures and O2 levels for furnace operation — LP
Burner size
Low Fire (1%)
High Fire (100%)
O2 (%)
Manifold
(in. w.c)
O2 (%)
Manifold
(in. w.c)
235 MBH 2-stg
5.2 - 5.6
0.14 - 0.18
3.1 - 3.4
0.67 - 0.69
350 MBH 2-stg
6.4 - 6.7
0.12 - 0.14
3.2 - 3.4
0.43 - 0.53
500 MBH 2-stg
5.4 - 5.8
0.2 - 0.3
3.0 - 3.4
0.9 - 1.0
500 MBH Mod
10.4 - 10.8
0.05 - 0.08
3.1 - 3.5
0.9 - 1.1
800 MBH 2-stg
(a)
5.4 - 5.8
0.14 - 0.15
2.9 - 3.3
0.62 - 0.64
800 MBH Mod
(a)
12.8 - 13.1
0 - 0.01
3.0 - 3.4
0.62 - 0.65
850 MBH 2-stg
5.7 - 6.1
0.16 - 0.17
6.2 - 3.4
0.70 - 0.73
850 MBH Mod
12.7 - 13.1
0 - 0.01
3.2 - 3.4
0.68 - 0.72
1000 MBH 2-stg
5.2 - 5.5
0.25 - 0.27
3.0 - 3.4
0.92 - 0.96
1000 MBH Mod
12.8 - 13.2
0 - 0.01
2.9 - 3.3
0.92 - 0.96
Note:
If the manifold pressure is not within the range shown on the chart, then the combustion fan speeds (P0, P1, and/or P2) need
adjustment. Typically, in increments of 20-40 RPM
(a)
800MBH is Horizontal Discharge. MBH is listed on gas heat rating plate.
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