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HIGH ALTITUDE INFORMATION
Pressure regulator adjustment will be required depending on altitude. See below for proper pressure regulator setting.
Fuel
Natural
2
LPG/Propane
1
High Altitude Pressure Switch Kits required for certain models, see Gas Heat Accessories table for order number.
2
LPG/Propane conversion kit required, see Gas Heat Accessories table for order number.
EXHAUST PIPE VENTING TABLE
1
Maximum Equivalent Vent Length − m
Vent Pipe
Vent Pipe
G61MPVT
G61MPVT
Diameter
−36B−070
50 mm (2 in.)
12.2
80 mm (3 in.)
16.1
100 mm (4 in.)
44
NOTE − Minimum Equivalent Vent Pipe length is 4.6 m.
1
Maximum Equivalent Vent Length" permitted is defined as Total Length (linear meters) of vent pipe, plus equivalent length (m) of fittings, plus equivalent length (m) of termination".
2
110 models installed in up−flow or down−flow applications must have the supplied 90° street ell installed directly into the unit flue collar. The street ell must be included
in the elbow count.
3
135 models installed in down−flow applications must have 80 to 50 mm (3 in. to 2 in.) reducing elbow (supplied) installed directly into the flue collar. Reducing ell must be
included in elbow count.
4
90_ elbows must be limited to sweep type elbows.
VENTING NOTES
One 90_elbow is equivalent to 1.5 m of straight vent pipe.
Two 45_ elbows are equal to one 90_ elbow.
One 45_ elbow is equivalent to 0.76 m of straight vent pipe.
Wall and roof termination (non−concentric) exhaust pipe must terminate with reducer to improve exhaust velocity away from intake piping.
070 − 50, 80, or 100 mm (2, 3 or 4 in.) − terminate with 40 mm (1−1/2 in.) pipe
090 − 50, 80, or 100 mm (2, 3 or 4 in.). − terminate with 50 mm (2 in.) pipe
110 − 80 or 100 mm (3 or 4 in.) − terminate with 50 mm (2 in.) pipe
135 − 80 or 100 mm (3 or 4 in.) − terminate with 50 mm (2 in.) pipe
TERMINATION KITS − EQUIVALENT VENT LENGTHS
Vent Pipe Di-
Heat Size
Heat Size
ameter
ameter
50 mm (2 in.)
80 mm (3 in.)
−070
070
100 mm (4 in.)
50 mm (2 in.)
80 mm (3 in.)
−090
090
100 mm (4 in.)
80 mm (3 in.)
−110
110
100 mm (4 in.)
80 mm (3 in.)
−135
−135
100 mm (4 in.)
1
Outdoor exhaust accelerator included in 71M80 kit; for use with −070 models.
G61MPVT − 50hz / Page 6
Manifold Pressure (Outlet) at High Fire − kPa
1
0−610
611−914
0.87
2.49
For altitudes of 0−610 m
2
G61MPVT
G61MPVT
G61MPVT
G61MPVT
−60C−090
−60C−110
4.5
not allowed
12.2
12.2
34.5
30
Concentric
Kits
50 mm (2 in.)
1
71M80 or 69M29
3.6
7.3
12.8
0.9
1.8
3.7
1.8
3.7
not allowed
not allowed
Altitude − m
1
915−1219
0.80
2.29
1
Maximum Equivalent Vent Length − m
3
G61MPVT
G61MPVT
G61MPVT
G61MPVT
−60D−135
−36B−070
not allowed
7.6
7.6
10
20
27.5
Vent Pipe Equivalent Length − meters
80 mm (3 in.)
60L46
40 mm (1−1/2 in.) x 305 mm 50 mm (2 in.) x 305 mm
not allowed
not allowed
not allowed
0.9
not allowed
1.8
not allowed
3.7
not allowed
1.8
not allowed
3.7
not allowed
4.6
not allowed
7.6
not allowed
1
1220−1372
0.75
2.12
For altitudes of 611−1372 m
2
G61MPVT
G61MPVT
G61MPVT
G61MPVT
−60C−090
−60C−110
not allowed
not allowed
7.6
7.6
21.5
18.7
Outdoor Exhaust Accelerator
(Diameter X Length)
(Diameter X Length)
1.2
not allowed
2.4
not allowed
4.3
not allowed
0.70
2.02
3
G61MPVT
G61MPVT
−60D−135
not allowed
not allowed
not allowed
0.3
0.6
1.2
0.6
1.2
1.8
3.0
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