Armstrong Air Conditioning A97DSMV, Installation Instructions Manual

Page: 50 / 68

507029-03 Page 50 of 68 Issue 1622
High Altitude Information
NOTE: In Canada, certification for installation at elevations
over 4500 feet (1372 m) is the jurisidiction of local authorities.
These units require no manifold pressure adjustments for
operation at altitudes up to 7,500 feet (2286 m) above sea
level. Table 27 lists conversion kit requirements, pressure
switch requirements and manifold pressures at all altitudes.
The combustion air pressure switch is factory set and
requires no adjustment.
Proper Combustion
Furnace should operate a minimum of 15 minutes with cor-
rect manifold pressure and gas flow rate begore checking
combustion. Take combustion sample beyond the flue outlet
and compare to the tables below. The maximum carbon
monoxide reading should not exceed 100 ppm.
Conversion Kit Requirements
Table 27
Model
Input
Size
LP/Propane
Kit
High Altitude Pressure Switch Kit
0 - 10,000
(0-3048 m)
0 - 7,500
(0 - 2286 m)
7,501 - 10,000
(2287 - 3048m)
70
68W77 Not required 14T67
90
110
135
CAUTION
DO NOT attempt to make adjustments to the gas valve.
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 27) is necessary to convert this unit. Refer to the changeover
kit installation instructions for the conversion procedure.
Table 28
Manifold and Operating Signal Pressures in inches 0-7500 ft (0-2286 m)
High Fire
Table 25
Table 26
Low Fire