i!j
HEATING
VALUE
BTU/CU.
FT.
700
725
750
775
800
825
850
875
900
925
950
975
1000
1050
1100
NATURAL GAS MANIFOLD PRESSURE (in wc) 20,000 BTU per burner*
MEANELEVATIONFEETABOVE SEALEVELft (m)
0 to 2000 2001to 30001 3001to 4000 4001to 5000 5001to 6000 6001to 7000
(0to 610) (610.1to 914)1" (914.1to 1219) (1219.1to 1524) (1524.1to 1829) (1829.1to 2134)
Mnfld Mnfld Mnfld Mnfld Mnfld Mnfld
Orifice Orifice Orifice Orifice Orifice Orifice
Press Press Press Press Press Press
7001to 8000
(2134.1to 2438)
Mnfld
Orifice
Press
44 3.7
, , . 44 3.7 44 3.4
. . , 44 3.5 44 3.2
44 3.5 44 3.2 44 3.0
44 3.6 44 3.3 44 3.0 44 2.8
44 3.7 44 3.4 44 3.1 44 2.9 44 2.6
44 3.5 44 3.2 44 2.9 44 2.7 44 2.5
44 3.5 44 3.3 44 3.0 44 2.8 44 2.5 47 3.4
44 3.3 44 3.1 44 2.8 44 2.6 47 3.5 48 3.6
44 3.7 44 3.2 44 2.9 44 2.7 44 2.5 48 3.7 48 3.4
44 3.5 44 3.0 44 2.8 44 2.6 47 3.4 48 3.5 48 3.3
44 3.3 44 2.8 44 2.6 47 3.5 48 3.7 48 3.4 49 3.6
44 3.2 44 2.7 44 2.5 47 3.3 48 3.5 48 3.2 49 3.4
44 2.9 44 2.5 48 3.7 48 3.4 49 3.7 ........
46 3.3 48 3.7 48 3.4 49 3.7 ............
* When installing the 100,000 BTU furnace in downflow or horizontal positions, firing rate is reduced to 19,500 BTU/celI. Subtract
0.2" w.c from the manifold pressures listed in table above for the correct manifold pressure.
Conversion:1inwc=.25kPa
Bold- indicates factory orificesize.
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/N FPA 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.
1- 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 Table 6 and Table 7.
LPG or PROPANE GAS MANIFOLD PRESSURE (in wc)
HEATING FURNACE MEANELEVATIONFEETABOVESEALEVELft (m)
VALUE
INPUTBTU/ 0 to 2000 2001 to 30001" 3001 to 4000 4001to 5000 5001 to 6000 6001to 7000 7001to 8000
BTU/CU.
FT. BURNER (0 to 610) (610.1to 914)1" (914.1to 1219) (1219.1to 1524) (1524.1to 1829) (1829.1to 2134) (2134.1to 2438)
2500 10.0 8.9 8.4 10.0 10.0 10.0 10.0
OrificeSize 20000 #55 #55 # 55
2500 9.9 8.4 8.0 10.0 10.0 10.0 9.6
OrificeSize 19500:1: #55 #55 # 55
Applies to 100,000 BTU models when installed in the downflow or horizontal applications
Conversion:1inwc=.25kPa
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/N FPA 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.
1- 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 Table 6 and Table 7.
The burner orifice part nos. are as follows: General Berating Rules
Orifice Part # Orifice Part #
41 1096942 42 1011351
43 1011377 44 1011352
45 1011353 46 1011744
47 1011378 48 1113201
49 1113202 54 1011376
55 1011354 56 1011355
1. These furnaces may be used at full input rating when
installed at altitudes up to 2,000' (609.6m). When installed
above 2,000' (609.6m), the input must be decreased 2%
(Natural) or 4% (Propane) for each 1000' above sea level in
the USA. In Canada, the input rating must be derated 5%
(natural) or 10% (Propane) for each 1000' (304.8m) above
sea level. See Table 6 or Table 7 for required high altitude
input rate.
2. For operation with natural gas at altitudes above 2,000'
(609.6m), orifice change and/or manifold pressure
adjustments may be required for the gas supplied. First
consult your local gas supplier, then refer to Table 6 for
required pressure change and/or orifice change for high
altitudes.
440 01 1051 03 Specifications are subject to change without notice. 35
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