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FIGURE 20
Operating Signal Pressure Measurement
TABLE 20
Unit
Production
Resonance (more air)
Difficulty Igniting (less air)
Orifice Size (Part No)
Orifice Size
Cat No
Orifice Size
Cat No
060
0.969 (08)
1.000
19X30
0.937
19X37
080
1.094 (07)
1.125
19X31
0.995
19X36
100
1.250 (06)
1.281
19X39
1.219
19X32
G- Proper Combustion
Furnace should operate a minimum 15 minutes with cor
rect manifold pressure and gas flow rate before checking
combustion. Take combustion sample beyond the flue out
let and compare to the tables below. The maximum carbon
monoxide reading should not exceed 100 ppm.
TABLE 21
Firing Rate
CO
2
%
For Nat
CO
2
%
For LP
High Fire
6.0 - 7.8
7.5 - 9.9
Low Fire
The maximum carbon monoxide reading is 100 ppm.
H- High Altitude
Units are
NOT
approved for installations over 4500 ft
