Lennox SLP99UH070XV36B - H- Proper Combustion; I- High Altitude

Page 67
H- Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com
bustion. Take combustion sample beyond the flue outlet
and compare to the tables below. The maximum carbon
monoxide reading should not exceed 100 ppm.
TABLE 29
High Fire
SLP99UHV Unit
CO
2
%
For Nat
CO
2
%
For L.P.
070
6.5 - 9.0 7.7 - 10.2
09036C/48C
09060C 6.7 - 9.2 8.0 - 10.5
110
6.5 - 9.0 7.7 - 10.2
135
The maximum carbon monoxide reading should not exceed 100 ppm.
TABLE 30
Low Fire
SLP99UHV Unit
CO
2
%
For Nat
CO
2
%
For L.P.
070
4.7 - 7.2 5.7 - 8.2
09036C/48C
09060C 5.3 - 7.8 5.7 - 8.2
110
4.7 - 7.2 5.7 - 8.2
135
The maximum carbon monoxide reading should not exceed 100 ppm.
I- High Altitude
NOTE - In Canada, certification for installations at eleva
tions over 4500 feet (1372 m) is the jurisdiction of local au
thorities.
SLP99UH09060C ONLY requires a gas orifice change at al
titudes from 4501 to 10,000 ft. All other model units require
no manifold pressure adjustment nor a gas orifice change
for operation at altitudes up to 10,000 feet (3048m) above
sea level. Units installed at altitude of 7,501 to 10,000 feet
(2287 to 3048m) require a pressure switch change per table
31. Table 31 also lists gas conversion kit requirements at all
altitudes.
The combustion air pressure switch is factory-set and re
quires no adjustment.
TABLE 31
Conversion Kit Requirements
Model Input
LP Conversion Kit
Nat Burner
Kit
0-4500 ft
(0-1372m)
4501-10,000ft
1372-3038m)
4501-10,000 ft
(1372-3048m)
070
65W77 65W77 N/A
09036C, 48C
09060C 20A26 20A88 20A89
110
65W77 65W77 N/A
135
Model Input
High Altitude Pressure Switch
0-7500 ft
(0-2286m)
7501-10,000 ft
(2286-3048m)
070
N/A
14T65
09036C, 48C
09060C 20A87
110
14T65
135
TABLE 32
Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m)
SLP99
Firing Rate
Manifold Pressure Nat Gas
Manifold Pressure
LP/Propane
Operating Pressure Signal
(Delta P)
Min Max Min Max Min Max
Low 0.4 0.95 1.2 2.8 0.20 0.40
High 3.0 3.8 9.1 10.5 0.95 1.25
-090-060C Only Min Max Min Max Min Max
Low 0.30 0.85 1.2 2.8 0.15 0.35
High 3.0 3.8 9.1 10.5 0.95 1.20
NOTE - The values given in table are measurements only. The gas valve should NOT be adjusted.
NOTE - A natural to LP/propane gas changeover kit (table 31) is necessary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.