30
S9V2-VS-SVX001-1C-EN
High Altitude Derate
Input ratings (BTUH) of these Furnaces are based on sea level
operation and should not be changed at elevations up to 2,000 ft. (610
m).
If the installation is 2,000 ft. (610 m) or above, the Furnace input rate
(BTUH) shall be reduced 4% for each 1,000 ft. above sea level.
Installations of this furnace at altitudes above 2,000 ft. (610 m) shall
be made utilizing the Vent Length table and/or Part Numbers for
Replacement Orifices table in these installation instructions.
The Furnace input rate shall be checked by clocking the gas flow rate
(CFH) and multiplying by the heating value obtained from the local
utility supplier for the gas being delivered at the installed altitude.
Input rate changes can be made by adjusting the Manifold Pressure
(min 3.0 - max 3.7 in. W.C. - Natural Gas) or changing orifices (orifice
change may not always be required).
If the desired input rate can not be achieved with a change in Manifold
Pressure, then the orifices must be changed. Propane installations will
require an orifice change.
Important: Reinstall the replacement orifices to the same depth as
the orifices supplied with the equipment.
See the table for help in selecting orifices if orifice change is required.
Furnace input rate and temperature rise should be checked again after
changing orifices to confirm the proper rate for the altitude.
The vent length table shows the required vent lengths for installations
at various altitudes. Optional high altitude kits are available for
installations over 5000 feet. Installations above 12,000 feet are not
allowed.
PART NUMBERS FOR REPLACEMENT ORIFICES
DRILL SIZE PART
NUMBER
DRILL SIZE PART
NUMBER
44 ORF00501 54 ORF00555
45 ORF00644 55 ORF00693
46 ORF00909 56 ORF00907
47 ORF00910 57 ORF00908
48 ORF01099 58 ORF01338
49 ORF00503 59 ORF01339
50 ORF00493
Turn the main Gas Valve toggle switch within the unit to the "OFF"
position. Turn the external gas valve to "ON". Purge the air from the
gas lines. After purging, check all gas connections for leaks with a
soapy solution – DO NOT CHECK WITH AN OPEN FLAME. Allow 5
minutes for any gas that might have escaped to dissipate.
Propane Gas being heavier than air may require forced ventilation.
Turn the toggle switch on the Gas Valve in the unit to the "ON"
position.
The table lists the main burner orifices
used with the furnace. If a change of
orifices is required to correct the furnace
input rating refer to the part number for
replacement orifices table.
Installation of this furnace at altitudes
above 2000 ft (610m) shall be in
accordance with local codes, or in the
absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 or
National Standard of Canada, Natural
Gas and Propane Installation Code, CSA
B149.1. Installation of this furnace at
altitudes above 2,000 ft (610 m) shall be
made in accordance with the listed high
altitude conversion kit available with the
furnace.
Orifice
Twist Drill
Size If
Installed at
Sea Level
Altitude Above Sea Level
and Orifice Required at Other Elevations
2000 3000 4000 5000 6000 7000 8000 9000 10000
42 42 43 43 43 44 44 45 46 47
43 44 44 44 45 45 46 47 47 48
44 45 45 45 46 47 47 48 48 50
45 46 47 47 47 48 48 49 49 50
46 47 47 47 48 48 49 49 50 51
47 48 48 49 49 49 50 50 51 52
54 54 55 55 55 55 55 56 56 56
55 55 55 55 56 56 56 56 56 57
56 56 56 57 57 57 58 59 59 60
57 58 59 59 60 60 61 62 63 63
58 59 60 60 61 62 62 63 63 64
From National Fuel Gas Code — Table E.1.1(d)
FFuurrnnaaccee GGeenneerraall IInnssttaallllaattiioonn
To Next Page
Loading...
Need help?
General