1. Turn off furnace gas and electrical supplies.
2. Remove control access door.
3. Turn furnace gas valve switch to OFF position.
4. Remove burner hold-down bracket.
5. Remove burners from manifold.
6. Remove and discard orifices from manifold.
7. Refer to conversion kit rating plate 326108–201 to determine main burner orifice size.
Furnace gas input rate on rating plate is for installations at altitudes up to 2000 ft.
In the U.S.A., the input rating for altitudes above 2000 ft must be reduced by 4 percent for each 1000 ft above sea level.
In Canada, the input rating must be derated by 10 percent for altitudes of 2000 ft to 4500 ft above sea level.
8. Install main burner orifices. Do not use Teflon tape. Finger-tighten orifices at least 1 full turn to prevent cross-threading, then tighten with
wrench. There are enough orifices in each kit for largest furnace. Discard extra orifices. Orifices of other sizes must be field supplied and
are available through your local distributor.
9. Reinstall main burners on manifold. Burners should be installed left (flame sensor side) to right (ignitor side) to ensure proper alignment
of the burner crossover slot. (See Fig. 4 for ignitor position.)
10. Reinstall burner hold-down bracket.
11. For models 58DXT, 58UXT, 58UXV, 330JAV, 331JAV, and 333JAV only, remove NO
X
emissions-reducing device as follows:
NOTE:
Models 58DXT, 58UXT, 58UXV, 330JAV, 331JAV and 333JAV are supplied with NO
X
emissions-reduction devices necessary for use
with Natural Gas in NO
X
emissions-regulated areas.
CAUTION: Furnace models 58DXT, 58UXT, 58UXV, 330JAV, 331JAV, and 333JAV, must have low NO
X
coils removed
prior to operating furnace on propane gas.
CAUTION: Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and
dangerous operation.
ATTENTION: Lors des opérations d’entretien des commandes, étiqueter tous les fils avant de les déconnecter. Toute
erreur de câblage peut être une source de danger et de panne.
a. Be sure gas and electrical supplies to furnace are off.
b. Remove wires from gas valve. Note location for reassembly.
c. Remove wires from flame sensor and flame rollout safety switch(es). Disconnect ignitor wire connector.
d. Remove 4 screws that hold gas control assembly to heat exchanger cell panel and remove gas control assembly.
e. Using needle nose pliers, remove coil from bracket on each heat exchanger cell inlet plate. (See Fig. 5.)
f. Replace gas control assembly and secure to heat exchanger cell panel using 4 previously removed screws.
g. Reconnect wires to flame sensor and flame rollout safety switch(es), and reconnect ignitor wire connector. See furnace wiring label to
ensure proper location of wires.
h. Reconnect wires to gas valve. See wiring label on furnace to ensure proper location of wires.
i. Reconnect gas supply pipe to gas valve using backup wrench on gas valve to prevent rotation and improper orientation.
NOTE:
Use propane-gas resistant pipe dope to prevent gas leaks. DO NOT use Teflon tape.
PROCEDURE 2—PRE-ADJUST GAS VALVE
CAUTION: The gas valve must be pre-adjusted before operating on propane gas. Failure to follow this caution could
result in excess underfire and flashback. If left this way sooting and corrosion will occur leading to early heat exchanger
failure.
1. Be sure gas and electrical supplies to furnace are off.
2. Remove caps that conceal adjustment screws for high- and low-heat stage gas-valve regulators. (See Fig. 3.)
3. Turn low-heat stage adjusting screw (5/64-in. hex allen wrench) clockwise (in) 1 full turn. This will increase the manifold pressure closer
to the propane low-heat set point.
4. Turn high-heat stage adjusting screw (5/64-in. hex allen wrench) clockwise (in) 2 full turns. This will increase the manifold pressure closer
to the propane high-heat set point.
5. Replace caps that conceal gas-valve regulator adjustment screws.
PROCEDURE 3—CHECK INLET GAS PRESSURE
NOTE:
This kit is to be used only when inlet gas pressure is between 11.0-in. wc and 13.6-in. wc.
1. Be sure main gas and electric supplies to furnace are off.
2. Remove 1/8-in. pipe plug from inlet pressure tap on gas valve. (See Fig. 3.)
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