High Altitude Information; Conversion Kit Requirements And Manifold Test Pressures - Lennox G71MPP-36B-070 Installation Instructions Manual

NOTE - In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local au-
thorities.
G71MPP units require no manifold pressure adjustments
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 33. Table 33 lists conversion kit requirements pres-
sure switch requirements and manifold pressures at all alti-
tudes.
NOTE- The values given in table are measurements only.
The gas valve should not be adjusted.
The combustion air pressure switch is factory-set and re-
quires no adjustment,
NOTE - A natural to L.P. propane gas changeover kit is
necessary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
TABLE 33
Conversion Kit Requirements and Manifold Test Pressures
Model
Input
Size
-O7O
-090
-110
-135
LP/Propane High Altitude Pressure Manifold Pressure at All Altitudes (in. w.g.)
Kit Switch Kit
0 - 10,000
(0 - 3048 m)
33W41
0 - 7,500 7,501 - 10,000
(0 - 2286 m) (2287 -
3048rn)
36W77
40W05
Not required
40W06
40W07
Low Fire
(40% rate)
Natural Gas LP/Propane
0.7 2.0
High Fire
(100% rate)
Natural Gas LP/Propane
3.5 10.0
NOTE - Pressure switch is factory set. No adjustment necessary. All models use the factory installed pressure switch from 0-7,500 feet (0- 2286m).
NOTE - See previous page for manifold pressure measurement procedure.
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