ICP 8MPT Installation Insrtuctions page 21

MANIFOLDPRESSUREAND ORIFICE SIZE FOR HIGH ALTITUDEAPPLICATIONS
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HEATING
VALUE at
ALTITUDE
BTU/CU.
FT,
700
725
750
775
800
825
850
875
900
925
950
975
1000
1050
1100
Conversion: 1in wc= 249Pa
NATURAL GAS MANIFOLD PRESSURE (in wc)
MEAN ELEVATION FEET ABOVE SEA LEVEL if(m)
0 to2000 2001 to3000 3001to4000 4001 to5000 5001 to6000 6001 to 7000
(0to609.6) (609.9 to914.4) (914.7 to 1219.2) (1219.5 to 1524) (1524.3 t o 1828.8) (1829.1 t o 2133.6)
Orifice Mnfld Pres- Orifice MnfldPressure Orifice MnfldPressure Orifice Mnfld Pressure Orifice Mnfld Pressure Orifice Mnfld Pres-
No. sure No. No. No. No. No. sure
HI LO HI LO HI LO HI LO HI LO HI LO
7001to 8000
(2133.9to 2438.4)
Orifice MnfldPres-
No. sure
HI LO
_ = _- _ = ,_ := = _ i.:_= . 41 3.7 1.8
_ :=- = 41 3.7 1.8 41 3.4 1.7
:-_ , _: , _ i..- _ _ i,;::4 .. _ 41 3.5 1.7 42 3.6 1.7
41 3.6 1.7 42 3.6 1.8 42 3.3 1.6
41 3.6 1.8 42 3.7 1.8 42 3.4 1.7 42 3.1 1.5
41 3.7 1.8 41 3.4 1.7 42 3.5 1.7 42 3.2 1.6 43 3.6 1.8
41 3.5 1.7 42 3.6 1.7 42 3.3 1.6 43 3.7 1.8 43 3.4 1.7
41 3.6 1.7 42 3.6 1.8 42 3.4 1.6 42 3.1 1.5 43 3.5 1.7 43 3.2 1.6
42 3.7 1.8 42 3.4 1.7 42 3.2 1.6 43 3.6 1.7 43 3.3 1.6 44 3.5 1.7
41 3.7 1.8 42 3.5 1.7 42 3.3 1.6 43 3.7 1.8 43 3.4 1.7 43 3.1 1.5 44 3.3 1.6
41 3.5 1.7 42 3.3 1.6 42 3.1 1.5 43 3.5 1.7 43 3.2 1.6 44 3.4 1.7 44 3.1 1.5
42 3.7 1.8 42 3.2 1.6 43 3.6 1.8 43 3.3 1.6 44 3.5 1.7 44 3.2 1.6 45 3.6 1.7
42 3.5 1.7 43 3.7 1.8 43 3.4 1.7 43 3.1 1.5 44 3.3 1.6 45 3.7 1.8 45 3.4 1.7
42 3.2 1.6 43 3.3 1.6 43 3.1 1.5 44 3.3 1.6 45 3.6 1.8
43 3.6 1.7 44 3.5 1.7 44 3.2 1.6 45 3.6 1.8
NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI
Z223.1-2006/NFPA 54-2006 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 4 and Table 5.
The burner orifice part nos. are as follows:
High Altitude Air PressureSwitch
Orifice #41 1096942 Orifice #42 1011351
Orifice #43 1011377 Orifice #44 1011352 The factory-installed pressure switches need NOT be changed
Orifice #45 1011353 Orifice #54 1011376 for any furnace installations from sea level up to and including
Orifice #55 1011354 Orifice #56 1011355 8,000' (24.8.4 m) altitude.
PROPANE GAS MANIFOLD PRESSURE (in wc)
MEAN ELEVATION FEET ABOVE SEA LEVEL if(m)
HEATING VALUE 0to 2000 2001 to3000 3001 to4000 4001 to 5000 5001 to6000 6001 to 7000 7001 to 8000
at ALTITUDE (0to 609.6) (609.9 to914.4) (914.7 to1219.2) (1219.5 to 1524) (1524.3 t o 1828.8) (1829.1 t o 2133.6) (2133.9 t o 2438.4)
BTU/CU. FT.
"'1"° "'1.o .,1.o.,1.o.,1.o.,1.o.,1.o
2500 10.0 4.9 10.0 4.9 9.0 4.4 10.0 4.9 9.4 4.6 8.5 4.2 10 4.9
Orifice Size #54 #54 #54 #55 #55 #55 #56
Conversion: 1in wc= 249Pa
NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI
Z223.1-2006/NFPA 54-2006 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 4 and Table 5.
FIRE, EXPLOSION, CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in per-
sonal 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.
Changing Orifices
1,
2,
After disconnecting power and gas supply to the furnace,
remove the burner compartment door, exposing the burner
compartment.
Disconnect gas line from gas valve so manifold can be re-
moved.
3,
4,
Disconnect wiring at gas valve. Be sure to note the proper
location of all electrical wiring before being disconnected.
Remove the four (4) screws holding the manifold and gas
valve to the manifold supports. Do not discard any screws.
See Figure 17.
21
Specifications are subject to change without notice
441 01 202301