Installation guide

Ensurefurnaceisequippedwiththe correct main burner orifices.
Refer to Table 5 or Table 6 for correct orifice size and manifold
pressure for a given heating value and specific gravity for natural
and propane gas.
Operation Above 2000' Altitude
FIRE, EXPLOSION, CARBON MONOXIDE
POISONING HAZARD.
Failure to follow safety warnings exactly could
result in death, personal injury and/or property
damage.
This high-altitude gas-conversion shall be done by a
qualified service agency in accordance with the
Manufacturer's instructions and all applicable codes
and requirements, or in the absence of
local codes, the applicable national codes.
These furnace may be used at full input rating when installed at al-
titudes up to 2000'. When installed above 2000', the input must be
decreased 2% (natural gas) or 4% (LP gas) for each 1000' above
sea level in the USA. In Canada, the input rating must be derated
o
5% (natural) or 10 _ (LP) for each 1000' above sea level. This may
be accomplished by a simple adjustment of manifold pressure or
an orifice change, or a combination of a pressure adjustment and
an orifice change. The changes required depend on the installa-
tion altitude and the heating value of the fuel. Table 5 & Table 6
show the proper furnace manifold pressure and gas orifice size to
achieve proper performance based on elevation above sea level
for both natural gas and propane gas.
To use the natural gas table, first consult your local gas utility for
the heating value of the gas supply. Select the heating value in the
first column and follow across the table until the appropriate eleva-
tion for the installation is reached. The value in the box at the inter-
section of the altitude and heating value provides not only the
manifold pressure but also the orifice size. In the natural gas
tables, the factoy-shipped orifice size is in bold (42). Other sizes
must be obtained from service parts.
High Altitude Input Rate =
NamElevationeplate Sea Level Input Rate x (Multiplier)[USA]
Elevation
2001'-3000'
3001'-4000'
4001'-5000'
5001'-6000'
6001'-7000'
7001'-8000'
High Altitude Multiplier
Natural Gas
0.95
0.93
0.91
0.89
0.87
0.85
LP Gas
0.90
0.86
0.82
0.78
0.74
0.70
* Based on mid-range of elevation.
MANIFOLD PRESSUREAND ORIFICE SIZE FOR HIGH ALTITUDEAPPLICATIONS
HEATING
VALUE
at ALTITUDE
BTU/CU. FT.
7OO
725
75O
775
8OO
825
85O
875
9OO
925
95O
975
1000
1050
1100
NATURAL GAS MANIFOLD PRESSURE (" w.c.)
MEAN ELEVATION FEET ABOVE SEA LEVEL
0 to 2001 to 3001 to 4001 to 5001 to
2000 3000 4000 5000 6000
Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold Orifice Manifold
No. Pressure No. Pressure No. Pressure No. Pressure No. Pressure
6001 to 7001 to
7000 8000
Orifice Manifold Orifice Manifold
No. Pressure No. Pressure
41 3.7
41 3.7 41 3.4
41 3.5 42 3,6
41 3.6 42 3.6 42 3,3
42 3.7 42 3.4 42 3.1
3.6 42 3,5 42 3.2 42 2,9
3.4 42 3.3 42 3.0 42 2.8
3.4 42 3.1 42 2.8 42 2.6
3.2 42 2,9 42 2.7 42 2,5
3.0 42 2,8 42 2.5 44 3.3
2.9 42 2.6 42 2.4 44 3.1
2.7 42 2.5 44 3.2 45 3.6
2.6 42 2.4 45 3.7 45 3.4
3.3 45 3.6
41 3.7 41
41 3.5 41
41 3.6 42 3.6 42
42 3,7 42 3,4 42
41 3.7 42 3.5 42 3.3 42
41 3.5 42 3,3 42 3,1 42
42 3.7 42 3.2 42 2.9 42
42 3,5 42 3,0 42 2.8 42
42 3,2 42 2,7 42 2,5 44
43 3.6 42 2.5 44 3.2 45 3.6
NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code
ANSI Z223.1-2002/NFPA 54-2002 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1-05.
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