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
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
TABLE 30
Low Fire
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
-110
4.7 - 7.2
-135
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.
TABLE 31
Conversion Kit & High Altitude Requirements
Model Input
LP/Propane Conversion Kit Natural Burner
Kit
0 - 4500 ft
(0 - 1372m)
4501 - 10,000 ft
(1372 3048m)
4501 - 10,000 ft
(1372 3048m)
070
65W77
65W77
Not Required
090XV36C/48C
090XV60C
20A26
20A88
20A89
110
65W77
65W77
Not Required
135
Model Input
High Altitude Pressure Switch
0 - 7500 ft
(0 - 2286m)
7501 - 10,000 ft
(2286 - 3048m)
070
Not
Required
14T65
090XV36C/48C
090XV60C
20A87
110
14T65
135
TABLE 32
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
0.40
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
----
----
0.15
0.35
Low
----
----
1.2
2.8
0.20
0.40
High
3.0
3.8
9.1
10.5
0.95
1.25
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
.
