Lennox SLP99DFV Series User Manual

Page 59
G- Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas ow rate before checking com-
bustion. Take combustion sample beyond the ue outlet
and compare to the tables below.
TABLE 30
High Fire
SLP99DFV Unit
CO
2
% Nat CO
2
L.P.
6.5 - 9.0 7.7 - 10.2
070
090
110
The maximum carbon monoxide reading should not ex-
ceed 100 ppm.
TABLE 31
Low Fire
CO
2
% Nat CO
2
% LP
SLP99DFV Unit
4.7 - 7.2 5.7 - 8.2
070
090
110
The maximum carbon monoxide reading should not ex-
ceed 100 ppm.
H- High Altitude
NOTE - In Canada, certication for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
Units require no manifold pressure adjustment nor a gas
orice 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 32. TABLE 32 also lists gas
conversion kit requirements at all altitudes.
The combustion air pressure switch is factory-set and re-
quires no adjustment.
TABLE 32
Conversion Kit Requirements
Model
Input Size
LP/Propane High Altitude Pressure Switch
0 - 10,000 ft
(0 - 3048m)
0 - 7500 ft
(0 - 2286m)
7501 ft - 10,000 ft
(287 - 3048m)
070
65W77
Not
Required
14T67090
110
TABLE 33
Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m)
SLP99 Firing
Rate
Manifold Pressure Natural 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
NOTE - A natural to LP/propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit instal-
lation instruction for the conversion procedure.
NOTE - The values given in table are measurements only. The gas valve should NOT be adjusted.

Lennox SLP99DFV Series Specifications

General

Brand	Lennox
Model	SLP99DFV Series
Category	Furnace
Language	English