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9. Press the + and - buttons together (escape) to return to
normal operation. The PWM blower will now respond to
the external load control signal being supplied to the
LME7.
Note: For more information contact Large Commercial
Technical Support.
Table 58. Recommended manifold pressures and O2 levels for furnace operation — natural gas
Burner size
235 MBH 2-stg
350 MBH 2-stg
500 MBH 2-stg
500 MBH Mod
800 MBH 2-stg
(a)
800 MBH Mod
(a)
850 MBH 2-stg
(a)
850 MBH Mod
(a)
1000 MBH 2-stg
1000 MBH Mod
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)
For Horizontal MBH, refer to gas heat rating plate for actual capacity.
Table 59. Recommended manifold pressures and O2 levels for furnace operation — LP
Burner size
235 MBH 2-stg
350 MBH 2-stg
500 MBH 2-stg
500 MBH Mod
800 MBH 2-stg
(a)
(a)
800 MBH Mod
850 MBH 2-stg
(a)
850 MBH Mod
(a)
RT-SVX072D-EN
Low Fire (1%)
Manifold
O2 (%)
(in. w.c)
6.5 – 7.2
0.37 – 0.39
6.8 – 7.2
0.33 – 0.37
5.8 – 7.2
0.68 – 0.72
5.8 – 6.2
0.18 – 0.22
5.6 – 5.8
0.45 – 0.49
11.2 – 11.6
0.04
5.6 – 5.9
0.43 – 0.45
10.9 – 11.4
0 – 0.05
4.5 – 5.2
0.63 – 0.68
10.6 – 10.9
0 – 0.05
Low Fire (1%)
Manifold
O2 (%)
(in. w.c)
6.4 - 6.8
0.18 - 0.21
6.8 - 7.2
0.18 - 0.21
5.7 - 6.1
0.29 - 0.32
10.5 - 10.9
0.06 - 0.10
5.8 - 5.9
0.19 - 2.0
11.8 - 12.0
0.01
5.9 - 6.1
0.19 - 0.23
11.6 - 11.8
0.02
Figure 101. Gas Heat Manual Override screen — two–
stage
High Fire (100%)
O2 (%)
3.0 – 3.4
3.0 – 3.4
3.0 – 3.4
3.0 – 3.4
3.8 – 4.0
3.8 – 4.0
3.0 – 3.3
3.0 – 3.3
2.8 – 3.2
2.8 – 3.2
High Fire (100%)
O2 (%)
3.2 - 3.6
3.2 - 3.6
2.8 - 3.2
2.8 - 3.2
3.3 - 3.6
3.5 - 3.6
3.4 - 3.6
3.6 - 3.8
Unit Start-up
Manifold
(in. w.c)
1.4 – 1.6
1.2 -1.3
2.3 – 2.6
2.3 – 2.6
1.84 – 1.88
1.83 – 1.87
1.8 – 2.1
1.8 – 2.1
2.5 – 2.7
2.6 – 2.7
Manifold
(in. w.c)
0.70 - 0.73
0.57 - 0.61
1.08 - 1.11
1.08- 1.11
0.78 - 0.82
0.78 - 0.82
0.87 - 0.92
0.93 - 0.97
121
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