Installation guide
Table I NATURAL GAS MANIFOLD PRESSURE ("w c )
MEAN ELEVATION FEET ABOVE SEA LEVEL
0 to 2001 to 300I to 4001 to 500I to 6001 to 700I to 6001 to 9001 to
HEATING 2000 3000 4000 5000 6000 7000 8000 9000 10000
VALUE at
ALTITUDE Odfic_ MnfldPress Orlfic_ MnfldPress Odfic_ MnfldPress Odfic_ MnfldPress Oriflc_ MnfldPress Orifice MnfldPress 9dflc_ MnfldPress Dr4fice MnfidPress 3dfice MnfldPress
BTU/CU. FT No Hi Lo No Hi Lo No Hi Lo No Hi Lo No Hi Lo No Hi Lo No. Hi Lo No Hi Lo No. Hi Lo
700 47 37 18 48 36 1.8 49 36 18
725 46 36 1.7 47 35 17 48 34 1.7 49 34 17
750 46 33 1.6 46 37 18 49 37 1.8 50 37 18
775 46 36 1 6 47 35 1.7 48 35 17 49 35 1.7 50 35 17
600 45 37 1.8 46 34 17 47 33 1.6 46 33 16 49 33 1.6 50 33 16
625 46 37 1.8 47 36 16 48 36 1.7 49 36 18 50 36 1.8 51 37 18
850 45 37 18 46 34 1.7 47 34 17 48 34 1.6 49 34 17 50 34 1.7 51 35 17
675 46 37 18 47 37 1.8 46 37 16 49 37 1.8 49 32 16 50 32 1.6 51 33 16
900 46 35 17 47 35 1.7 46 35 17 4g 35 1.7 50 36 18 5I 37 1.8 51 3I 15
925 43 3.4 17 45 36 18 46 33 16 48 37 1.8 46 33 16 49 33 1.6 50 34 17 5I 35 1.7 52 36 18
950 44 3.7 18 46 36 18 47 36 17 48 36 1.7 49 36 18 50 37 1.6 50 32 16 5I 33 1.6 52 34 17
975 44 3.5 17 46 34 17 47 34 17 48 34 1.7 49 35 17 50 35 1.7 51 36 18 5I 31 1.5 52 33 16
1000 44 3.3 16 47 37 I8 46 37 18 48 32 1.6 49 33 16 50 34 1.6 51 34 17 52 37 1.8 52 3I 15
1050 45 3.6 18 47 33 I6 46 3.3 16 49 34 I7 50 35 17
II00 46 3.5 17 48 34 I7 49 3.6 17 50 37 I8
Note: The orifice sizes in the chad above derate the input rate at 4% per 1000 feet above sea level for altitudes exceeding 2000 feet above sea level
If converting from propane (LP) gas to Natural Gas, use kit number 1175405 for altitudes up to 2000 feet above sea level
If converting from propane (LP) gas to Natural Gas, use kit number 1175405 and altitudes exceeding 2000 feet above sea level, use kit number 1I 75405 with field-supplied orifices
Natural gas data Jsbased on .6 specific gravity
For fuels with different specific gravity, consuk the National Fuel Gas Code NFPA 54-2605/ANSI Z223.1 - 2005 or
National Standard of Canada, Natural Gas and Propane Installation Code CSA B149.1-05
PROPANE (LP) GAS MANIFOLD PRESSURE ("w.c.)
MEAN ELEVATION FEET ABOVE SEA LEVEL
4001to5000 5001to6000 600t to7000
Table 2
HI-AIIN(5
VALUE at
ALTITUDE Oto 2000 2001to 3000 3001to4000 7001to 8000 8001to 9000 9001to 10000
2500 10.0 5.5 10.0 5.0 11.0 6.0 11.0 5.7 10.7 5.2 10.0 5.0 11.0 5.9 10.6 5.2 10.0 5.0
Orifice Size # 55 #55 # 56 # 56 #56 # 56 #57 #57 #57
KitNumber 1175406
Note: Theorifice sizes in thechart above deratethe inputrate at 4% per 1000feet abovesea level foraltitudesexceeding2000feet abovesea level.
Propane(LP) gasdata is basedon f.52 specificgravity.
For fuels with differentspecificgravity, consultthe National Fuel GasCode NFPA54-2005/ANSIZ223.1 - 2005 or
National Standardof Canada,Natural Gas and Propane InstallationCode CSA B149.f-05.
Changing Orifices
ELECTRICAL SHOCK, FIRE AND/OR EXPLOSION
HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Shut off electric power at unit disconnect or service
panel and shut off gas at manual shut off valve before
beginning the following procedure.
Changing orifices requires a qualified service
technician.
1. Shut OFF gas at manual shut off valve.
2. Shut OFF electric power at unit disconnect or service
panel. If unit is still running, allow 3 minutes after gas
shut off before turning off power.
3. Disconnect the wires from the gas valve, sparker, and
flame sensor.
4. Remove the four screws holding the manifold to the
manifold brackets.
5. Carefully remove the manifold with the gas valve
attached.
6. If unit has v-shaped NOx baffles installed in the firing
tubes, they must be removed when coverting to
propane (LP). Some baffles may be attached by
screws. Replace screws after removing NOx baffles
(figure 7).
CARBON MONOXIDE HAZARD.
Failure to follow this warning could result in per-
sonal injury death and/or property damage.
NOx baffles for use with Natural Gas units ONLY. If
propane (LP) Gas is required, NOx inserts must be
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