International comfort products C9MPX Installation Instructions Manual page 37

Table 6 NATURAL GAS MANIFOLD PRESSURE (in wc)
0 to 2000
HEATING
(0 to 610)
VALUE
Mnfld
BTU/CU.
Orifice
Press
FT.
700 -- --
725 -- --
750 -- --
775 -- --
800 -- --
825 -- --
850 -- --
875 -- --
900 -- --
925 44 3.7
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 = .25 kPa
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/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 (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.
Table 7 LPG or PROPANE GAS MANIFOLD PRESSURE (in wc)
HEATING
FURNACE
VALUE
INPUT BTU/ 0 to 2000
BTU/CU.
BURNER
(0 to 610)
FT.
2500
20000
Orifice Size
2500
19500‡
Orifice Size
‡ Applies to 100,000 BTU models when installed in the downflow or horizontal applications
Conversion: 1 in wc = .25 kPa
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/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 (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:
Orifice Part #
41 1096942
43 1011377
45 1011353
47 1011378
49 1113202
55 1011354
440 01 1051 02
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
2001 to 3000† 3001 to 4000
(610.1 to 914)† (914.1 to 1219)
10.0 8.9
#55 #55
9.9 8.4
#55 #55
Orifice Part #
42 1011351
44 1011352
46 1011744
48 1113201
54 1011376
56 1011355
Specifications are subject to change without notice.
20,000 BTU per burner*
4001 to 5000
(1219.1 to 1524)
Mnfld Mnfld
Orifice
Press Press
-- -- --
-- -- --
-- -- --
-- -- --
-- 44 3.6
3.7 44 3.4
3.5 44 3.2
3.3 44 3.0
3.1 44 2.8
2.9 44 2.7
2.8 44 2.6
2.6 47 3.5
2.5 47 3.3
3.7 48 3.4
3.4 49 3.7
MEAN ELEVATION FEET ABOVE SEA LEVEL ft (m)
4001 to 5000
(1219.1 to 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
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.
5001 to 6000 6001 to 7000
(1524.1 to 1829) (1829.1 to 2134)
Mnfld Mnfld
Orifice Orifice
Press Press
-- -- --
-- -- 44
-- -- 44
44 3.5 44
44 3.3 44
44 3.1 44
44 2.9 44
44 2.8 44
44 2.6 47
44 2.5 48
47 3.4 48
48 3.7 48
48 3.5 48
49 3.7 --
-- -- --
5001 to 6000 6001 to 7000
(1524.1 to 1829) (1829.1 to 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
3.7 44 3.4
3.5 44 3.2
3.2 44 3.0
3.0 44 2.8
2.9 44 2.6
2.7 44 2.5
2.5 47 3.4
3.5 48 3.6
3.7 48 3.4
3.5 48 3.3
3.4 49 3.6
3.2 49 3.4
-- -- --
-- -- --
7001 to 8000
(2134.1 to 2438)
10.0
#56
9.6
#56
37