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Table 6 – Natural Gas Manifold Pressure (in wc) 20,000 BTU per Burner*
0 to 2000
HEATING
(0 to 610)
VALUE
BTU/CU.
Mnfld
FT.
Orifice
Press
700
--- ---
--- ---
725
--- ---
--- ---
750
--- ---
--- ---
775
--- ---
--- ---
800
--- ---
--- ---
825
--- ---
--- ---
850
--- ---
--- ---
875
--- ---
--- ---
900
--- ---
--- ---
44
3.7
925
950
44
3.5
975
44
3.3
1000
44
3.2
1050
44
2.9
1100
46
3.3
* When installing the 100,000 BTU furnace in downflow or horizontal positions, firing rate is reduced to 19,500 BTU/cell. Subtract 0.2" w.c
from the manifold pressures listed in table above for the correct manifold pressure.
Conversion: 1 in wc = 249 Pa
Bold--- indicates factory orifice size.
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---2009/NFPA
54---2009 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1---10.
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 (609.6 to 1371.6m) above sea level. Use
{
the 2001 to 3000 (609.9 to 914.4m) column in Tables 6 and 7.
HEATING
FURNACE
VALUE
INPUT
0 to 2000
BTU/CU.
BTU/
(0 to 610)
FT.
BURNER
2500
Orifice
20000
Size
2500
Orifice
19500‡
Size
‡ Applies to 100,000 BTU models when installed in the downflow or horizontal applications
Conversion: 1 in wc = 249 Pa
NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1---2009/NFPA
54---2009 or National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1---10.
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 (609.6 to 1371.6m) above sea level. Use
{
the 2001 to 3000 (609.9 to 914.4m) column in Tables 6 and 7.
The burner orifice part nos. are as follows:
Orifice #41
Orifice #42
Orifice #43
Orifice #44
Orifice #45
Orifice #46
Orifice #47
Orifice #48
Orifice #49
Orifice #54
Orifice #55
Orifice #56
MEAN ELEVATION FEET ABOVE SEA LEVEL Ft. (M)
2001 to 3000†
3001 to 4000
(610.1 to 914)†
(914.1 to 1219)
Mnfld
Orifice
Orifice
Press
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
44
--- ---
--- ---
44
44
3.5
44
44
3.3
44
44
3.2
44
44
3.0
44
44
2.8
44
44
2.7
44
44
2.5
48
48
3.7
48
Table 7 – LPG or Propane Gas Manifold Pressure (in wc)*
MEAN ELEVATION FEET ABOVE SEA LEVEL Ft (M)
2001 to 3000†
3001 to 4000
(610.1 to
(914.1 to
914)†
10.0
8.9
#55
#55
9.9
8.4
#55
#55
333730- -701
333730- -702
333730- -703
333730- -704
333730- -705
333730- -709
333730- -710
333730- -711
333730- -712
333730- -706
333730- -707
333730- -708
4001 to 5000
5001 to 6000
(1219.1 to
(1524.1 to
1524)
Mnfld
Mnfld
Orifice
Orifice
Press
Press
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
--- ---
44
--- ---
44
3.6
44
3.7
44
3.4
44
3.5
44
3.2
44
3.3
44
3.0
44
3.1
44
2.8
44
2.9
44
2.7
44
2.8
44
2.6
47
2.6
47
3.5
48
2.5
47
3.3
48
3.7
48
3.4
49
3.4
49
3.7
--- ---
4001 to 5000
(1219.1 to
1219)
1524)
8.4
10.0
# 55
#56
8.0
10.0
# 55
#56
General Derating Rules
1. These furnaces may be used at full input rating when in-
stalled at altitudes up to 2,000' (610 M). When installed
above 2,000' (610 M), the input must be decreased 2%
(natural) or 4% (Propane) for each 1000' (305 M) above
sea level in the USA. In Canada, the input rating must be
derated 5% (natural) or 10% (Propane) for each 1000' (305
M) above sea level. See Table 6 or 7 for required high
altitude input rate.
2. For operation with natural gas at altitudes above 2,000'
(610 M), orifice change and/or manifold pressure adjust-
ments may be required for the gas supplied. First consult
36
6001 to 7000
(1829.1 to
1829)
2134)
Mnfld
Mnfld
Orifice
Press
Press
--- ---
--- ---
--- ---
--- ---
44
3.7
44
3.5
--- ---
3.5
44
3.2
3.3
44
3.0
3.1
44
2.9
2.9
44
2.7
2.8
44
2.5
2.6
47
3.5
2.5
48
3.7
3.4
48
3.5
3.7
48
3.4
3.5
48
3.2
3.7
--- ---
--- ---
--- ---
--- ---
--- ---
5001 to 6000
6001 to 7000
(1524.1 to
(1829.1 to
1829)
2134)
10.0
10.0
#56
#56
10.0
10.0
#56
#56
7001 to 8000
(2134.1 to
2438)
Mnfld
Orifice
Press
44
3.7
44
3.4
44
3.2
44
3.0
44
2.8
44
2.6
44
2.5
47
3.4
48
3.6
48
3.4
48
3.3
49
3.6
49
3.4
--- ---
--- ---
--- ---
--- ---
7001 to 8000
(2134.1 to
2438)
10.0
#56
9.6
#56
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