Lennox SLP99UHV Series Unit Information page 67

H- Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking co
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
Unit CO
-070
-09036C/48C
-09060C
-110
-135
TABLE 30
Unit CO
-070
-09036C/48C
-09060C
-110
-135
Manifold Pressure Natural Gas
SLP99 Firing
Rate
Low 0.40
High
-090-060C Only
Low 0.30
Low
High
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 is necessary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
% For Nat CO % For L.P.
2 2
6.5 - 9.0 7.7 - 10.2
6.7 - 9.2 8.0 - 10.5
6.5 - 9.0 7.7 - 10.2
Low Fire
% For Nat CO % For L.P.
2 2
4.7 - 7.2
5.3 - 7.8 5.7 - 8.2
4.7 - 7.2
Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m)
Min Max
0.95
3.0 3.8
Min Max
0.85
---- ----
3.0 3.8
I- High Altitude
NOTE - In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
SLP99UH09060C ONLY requires a gas orifice change
at altitudes from 4501 to 10,000 ft. All other model units
require no manifold pressure adjustment nor a gas ori-
fice 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.
Conversion Kit & High Altitude Requirements
Model Input
070
090XV36C/48C
090XV60C
110
135
Model Input
070
090XV36C/48C
090XV60C
110
135
TABLE 32
Manifold Pressure LP/Propane
Min Max
1.2 2.8
9.1 10.5
Min Max
---- ----
1.2 2.8
9.1 10.5
Page 67
TABLE 31
LP/Propane Conversion Kit
0 - 4500 ft 4501 - 10,000 ft
(0 - 1372m) (1372 3048m)
65W77 65W77
20A26 20A88
65W77 65W77
High Altitude Pressure Switch
0 - 7500 ft
7501 - 10,000 ft
(2286 - 3048m)
(0 - 2286m)
14T65
Not
20A87
Required
14T65
Operating Pressure Signal (Delta P)
Min
0.20
0.95
Min
0.15
0.20
0.95
Natural Burner
Kit
4501 - 10,000 ft
(1372 3048m)
Not Required
20A89
Not Required
Max
0.40
1.25
Max
0.35
0.40
1.25