Lennox SL280UHNV Series Unit Information page 34

Unit
Orifice Size (Part No)
060
080
100
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.
Operating Signal Pressure Measurement
FIGURE 20
Production Resonance (more air)
Orifice Size
0.969 (08) 1.000
1.094 (07) 1.125
1.250 (06) 1.281
TABLE 20
Cat No
19X30
19X31
19X39
Firing Rate
High Fire
Low Fire
The maximum carbon monoxide reading is 100 ppm.
H- High Altitude
Units are NOT approved for installations over 4500 ft
Page 34
Difficulty Igniting (less air)
Orifice Size Cat No
0.937 19X37
0.995 19X36
1.219 19X32
TABLE 21
CO % CO %
2 For Nat 2
6.0 - 7.8
7.5 - 9.9
For LP