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TABLE 24
Manifold and Operating Signal Pressures in inches 0 - 7500 ft (0 - 2286 m)
SLP98 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 (table 27) is necessary to convert this unit. Refer to the change-
over kit installation instruction for the conversion procedure.
Proper Combustion
Furnace should operate a minimum of 15 minutes with
correct manifold pressure and gas ow rate before check-
ing combustion. Take combustion sample beyond the ue
outlet and compare to the tables below. The maximum
carbon monoxide reading should not exceed 100 ppm.
TABLE 25
High Fire
Model Input Size CO2% Nat CO2% LP
070
6.5 - 9.0 7.7 - 10.2
090
110
135
TABLE 26
Low Fire
Model Input Size CO2% Nat CO2% LP
070
4.7 - 7.2 5.7 - 8.2
090
110
135
High Altitude Information
NOTE - In Canada, certication for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local
authorities.
SLP98UHV units require no manifold pressure adjust-
ments for operation at altitudes up to 10,000 feet (3048
m) above sea level. Units installed at altitude of 7,501 to
10,000 feet (2287 to 3048m) require a pressure switch
change per table 27. Table 27 also lists conversion kit re-
quirements.
The® combustion air pressure switch is factory-set and
requires no adjustment.
TABLE 27
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 14T65
090
110
135
Other Unit Adjustments
Primary Limit
The primary limit is located on the heating compartment
vestibule panel. This limit is factory set and require no ad-
justment.
Flame Rollout Switches (Two)
These manually reset switches are located on the inside
of the burner box. If tripped, check for adequate combus-
tion air before resetting.
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