ICP C8DNL Installation Instructions Manual - Warning
441 01 2314 06
Specifications are subject to change without notice.
24
the input rating must be derated 5% (natural) or 10% (Propane) for
each 1000′ (305m) 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 installation altitude and the heat-
ing value of the fuel. Table 5 & Table 6 show the proper furnace
manifold pressure and gas orifice size to achieve proper perfor-
mance 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 factory−shipped orifice size is in bold (42). Other sizes
must be obtained from service parts.
High Altitude Input Rate =
Nameplate Sea Level Input Rate x (Multiplier) [USA]
Elevation
ft (m)
High Altitude Multiplier
Natural Gas
Propane Gas
2001′ - 3000′
(610 − 914)
0.95
0.90
3001′ - 4000′
(915 − 1219)
0.93
0.86
4001′ - 5000′
(1220 − 1524)
0.91
0.82
5001′ - 6000′
(1524 − 1829)
0.89
0.78
6001′ - 7000′
(1829 − 2134)
0.87
0.74
7001′ - 8000′
(2134 − 2438)
0.85
0.70
* Based on mid−range of elevation.
FIRE, EXPLOSION, CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could
result in personal injury, death 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.
!
WARNING
MANIFOLD PRESSURE AND ORIFICE SIZE FOR HIGH ALTITUDE APPLICATIONS
Table 5
NATURAL GAS MANIFOLD PRESSURE (in wc)
HEATING
VALUE
at ALTITUDE
BTU/CU. FT.
MEAN ELEVATION ABOVE SEA LEVEL − ft(m)
0 to 2000
(0 to 610)
2001 to 3000*
(610 to 914)
*
3001 to 4000
(915 to 1219)
4001 to 5000
(1220 to 1524)
5001 to 6000
(1524 to 1829)
6001 to 7000
(1829 to 2134
)
7001 to 8000
(2134 to 2438)
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
700
−−
−−
−−
−−
−−
−−
−−
−−
−−
−−
−−
−−
41
3.7
725
−−
−−
−−
−−
−−
−−
−−
−−
−−
−−
41
3.7
41
3.4
750
−−
−−
−−
−−
−−
−−
−−
−−
−−
−−
41
3.5
42
3.6
775
−−
−−
−−
−−
−−
−−
−−
−−
41
3.6
42
3.6
42
3.3
800
−−
−−
−−
−−
−−
−−
−−
−−
42
3.7
42
3.4
42
3.1
825
−−
−−
−−
−−
41
3.7
41
3.6
42
3.5
42
3.2
42
2.9
850
−−
−−
−−
−−
41
3.5
41
3.4
42
3.3
42
3.0
42
2.8
875
−−
−−
41
3.6
42
3.6
42
3.4
42
3.1
42
2.8
42
2.6
900
−−
−−
42
3.7
42
3.4
42
3.2
42
2.9
42
2.7
42
2.5
925
41
3.7
42
3.5
42
3.3
42
3.0
42
2.8
42
2.5
44
3.3
950
41
3.5
42
3.3
42
3.1
42
2.9
42
2.6
42
2.4
44
3.1
975
42
3.7
42
3.2
42
2.9
42
2.7
42
2.5
44
3.2
45
3.6
1000
42
3.5
42
3.0
42
2.8
42
2.6
42
2.4
45
3.7
45
3.4
1050
42
3.2
42
2.7
42
2.5
44
3.3
45
3.6
−−
−−
−−
−−
1100
43
3.6
42
2.5
44
3.2
45
3.6
−−
−−
−−
−−
−−
−−
Conversion: 1 in wc = 249 Pa
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/NFPA
54−2009 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1−05.
*
In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design−certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (610 to
1372m) above sea level. Use the 2001 to 3000 (610 to 914m) column in Table 5 and Table 6.