e. Find closest natural gas heat value and specific gravity in Table 6.
f. Follow heat value line and specific gravity line to point of intersection to find orifice size and low- and high-heat manifold pressure
settings for proper operation at given natural gas condition.
EXAMPLE: (Using Table 6 at 0—2000 ft altitude)
Heat value 1050 Btu/cu ft
Specific gravity 0.62
Therefore, Orifice No. 45 is required.
12. Install main burner orifices. Finger-tighten orifices at least 1 full turn to prevent cross threading, then tighten with wrench. There are enough
orifices in each kit for the largest furnace. Discard extra orifices. Orifices of other sizes must be field supplied.
NOTE:
DO NOT reinstall the manifold, orifices, gas valve assembly, or burner enclosure front at this time.
PROCEDURE 2—REPOSITION AIR SHUTTER (060120 AND 120-20 SIZES ONLY)
1. Remove 2 screws holding air shutter in propane gas usage (PROP) position.
2. Reposition air shutter to natural gas usage (NAT) position. (See Fig. 12.) Screws will now be located in the shutter next to the NAT stamp.
NOTE:
Air opening above burners will now be unobstructed by air shutter.
PROCEDURE 3—REPLACE GAS VALVE
1. Be sure main gas and electrical supplies to furnace are off.
2. Remove propane gas valve using backup wrench, and discard valve.
NOTE:
Propane gas valve has RED knob and natural gas valve has BLUE knob or ELECTRIC SWITCH.
3. Install new natural gas valve to manifold.
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Fig. 11—Conversion Rating Plate Label
(Used for Natural Gas, Non-Condensing, 2-Speed and Variable-Speed Furnaces)
A97180
CONVERSION KIT RATING PLATE - CARRIER CORP.
APPLIANCE MODELS
58MVP, 355MAV
323870-101
REV. B
Max. Inlet Gas Pressure
(Press. Max. D’Admission De Gaz)
Manifold
Pressure
13.6
3,386
4.5
1,121
0-2,000 ft.
(0 - 610 m)
3.2 - 3.8
797 - 946
Refer to installation manual
Respecter les instruction D’Installation
2%
5%
4%
10%
58TMA, 58DXT,
331AAV, 331JAV
58TUA, 58UXT,
58UHV, 58UXV,
330AAV, 330JAV,
333BAV, 333JAV
THIS APPLIANCE HAS BEEN CONVERTED TO USE NATURAL GAS FOR FUEL REFER TO KIT INSTRUCTIONS FOR CONVERSION
PROCEDURES. USE PARTS SUPPLIED BY CARRIER CORPORATION AND INSTALLED BY QUALIFIED PERSONNEL. SEE EXISTING
RATING PLATE FOR APPLIANCE MODEL NO. AND INPUT RATING.
NOTE: Furnace gas input rate on rating plate is for installations up to 2000 ft. above sea level. In U.S.A. the input rating for altitudes above
2000 ft. must be derated (per chart below) for each 1000 ft above sea level. In Canada the input rating must be derated (per chart below) for
altitudes of 2000 ft. to 4500 ft. above sea level.
Pression
Tubulure
High Heat
1.3 - 1.7
324 - 423
4%
10%
Min. Inlet Gas Pressure
(Press. Min. D’Admission DeGaz)
2,000 - 10,000 ft
(610 - 3050 m)
KIT NO. KGAPN20012SP
FUEL USED: NATURAL GAS
(For Purpose of Input Adjustment)
(Pour L’Adjustment D’Entree)
A l t i t u d e
IN. W.C. (PO C.E.)
Pa
Low Heat
% DERATE
PER
1000 FT
% DERATE
FOR
2000-4500 FT
USA
CANADA
NATURAL GAS PRESSURE
CAUTION: DO NOT redrill burner orifices. Improper drilling (burrs, out-of-round holes, etc.) can cause excessive
burner noise and misdirection of burner flames. This can result in flame impingement of the burners and heat exchangers
causing failure. Obtain new orifices if orifice size must be changed.
A96249
BURNER
ORIFICE
BURNER
ORIFICE
—18—
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