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ALTERNATE METHOD FOR
CANADIAN HIGH-ALTITUDE
DERATE
In Canada, unless an orifice change is
specifically mandated by local codes, an
alternate method of altitude deration
through a reduction in manifold pressure
is acceptable as described in
Table 8.
The information in Table 8 is based on a
heating value of 1000 BTU per cubic feet
of natural gas, and 2500 BTU per cubic
feet of LP gas.
IMPORTANT: Actual input rates must be
measured on-site with manifold pressure
adjustment to ensure that an actual 10%
reduction in input rate is achieved.
Once this field adjustment has been
made, the label shown in Figure 48
must be affixed in a conspicuous
location on the front of the furnace
cabinet:
NOTE: This label is supplied in the
information packet shipped with each
furnace.
TABLE 7
ALTERNATE METHOD FOR CANADIAN HIGH-ALTITUDE DERATE
IMPORTANT: 90 Plus Models only. Do not use this chart for any 80 Plus Models
NATURAL GAS
ORIFICE
ALTITUDE
INPUT
OUTPUT
SIZE
45,000
40,500
60,000
54,000
75,000
67,500
0' - 2000'
#50
90,000
81,000
105,000
94,500
120,000
108,000
40,500
36,450
54,000
48,600
67,500
60,750
2001' - 4500'
#50
81,000
72,900
94,500
85,050
108,000
97,200
FIGURE 48
MANIFOLD PRESSURE-CHANGE LABEL
THE MANIFOLD PRESSURE OF THIS APPLIANCE HAS
BEEN FIELD ADJUSTED TO OBTAIN THE CORRECT
INPUT RATING FOR INSTALLATION AT ALTITUDES
BETWEEN 2,000 FEET AND 4,500 FEET ELEVATION.
LA PRESSION DU DISTRIBUTEUR D'ALIMENTATION
DE CET APPAREIL A ÉTÉ AJUSTÉ SUR LES LIEUX AFIN
D'OBTENIR LA BONNE PUISSANCE D'ENTRÉE POUR
UNE INSTALLATION ENTRE 2000 ET 4500 PIEDS
MANIFOLD
ALTITUDE
INPUT
OUTPUT
PRESSURE
45,000
60,000
75,000
3.5" W.C.
0' - 2000'
90,000
105,000
120,000
40,500
54,000
67,500
3.0" W.C.
2001' - 4500'
81,000
94,500
108,000
D'ALTITUDE.
92-24399-01-01
LP GAS
ORIFICE
MANIFOLD
SIZE
PRESSURE
40,500
54,000
67,500
1.15mm
10" W.C.
81,000
94,500
108,000
36,450
48,600
60,750
1.15mm
7.6" W.C.
72,900
85,050
97,200
45
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