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Installation Instructions
2 Gas Conversion Procedure
CAUTION:
The gas supply shall be shut off prior to disconnecting the
electrical power, before proceeding with the conversion.
2.1 Turning Off the Fuel Supply to the Appliance
1.
Set the room thermostat to "OFF" or its lowest temperature setting.
2.
Turn OFF the main gas supply to the appliance at the manual valve, outside
of the appliance cabinet.
3.
Remove the burner access panel.
4.
Move the appliance gas valve lever to the "OFF" position.
5.
Turn OFF the electrical power to the appliance.
2.2 Removal of the Burner Assembly
1.
Before beginning this step, follow the instructions listed above to turn off
the fuel supply to the appliance.
2.
Disconnect the fl ame sensor wire from the burner box.
3.
Disconnect the ignitor wires from the burner box.
4.
Remove the wires from the terminals of the gas valve.
5.
Remove supply gas piping from the gas valve.
2.3 Removal of the Burner Orifi ces
1.
Remove the four (4) fasteners that secure the gas manifold to the burner
box, as shown in Figure 1. Carefully remove the gas manifold assembly from
the burner box. Note that the gas manifold assembly consists of the gas
valve, the gas manifold, and the orifi ces.
2.
Carefully remove the burner orifi ces from the gas manifold, as shown in
Figure 1.
CAUTION:
Do not redrill the burner orifices. If the orifice size must be
changed, use only new orifices.
The size of the new orifi ces that will be installed into the unit will depend
upon the type of conversion (sea level or high altitude; natural gas or LP
gas). Please refer to the Section 9.2 of the Installation, Operation, and
Maintenance Manual for more details on your particular conversion.
Bosch Thermotechnology Corp.
Natural Gas to L.P. Gas Conversion Kit | 5
2.4 Conversion of Unit to LP Gas
1.
Table 1 is a detailed listing of the components in the LP gas conversion kit.
Please check the contents of the conversion kit with that of the parts listing,
and familiarize yourself with each component.
2.
For natural gas to LP conversions at elevations less than 2000 ft, use the
orifi ces supplied with your conversion kit. For other applications:
a. Refer to Section 9.2 of the Installation, Operation, and Maintenance
Manual.
b. Examine the rating plate of the unit to determine the rated input (Btu/
hr).
c. Count the number of burners in the burner box to determine the
appropriate LP gas orifi ce size for your conversion.
d. Using Table 9 in Section 9.2 of the Installation, Operation, and
Maintenance Manual, determine and obtain the correct fi eld supplied
orifi ces required for your application.
3.
Install the appropriate LP gas burner orifi ces into the gas manifold. When
installing the new orifi ces, DO NOT use pipe joint compound on the orifi ce
threads. Screw the orifi ces into the manifold by hand until snug to eliminate
cross threading, then tighten with a wrench. Before installing an orifi ce,
check the face or side of the orifi ce for the drill number to ensure that it is
the appropriate size.
4.
For the conversion to LP gas from natural gas, the spring in the current gas
valve must be replaced with a new spring that comes in the kit. Locate the
new spring and install it in the gas valve.
All Bosch 80% AFUE Gas Furnaces come standard with Natural Gas to
LP Conversion Kits. These kits are only applicable for units installed at
elevations between 0 and 2,000 feet.
Description
Installation instructions
#57 LPG main burner orifi ces
Conversion kit for gas valve
Gas valve instruction
Reducer bushings
Conversion information label
Table 1
LP gas conversion kit contents
* Dependent on the model of the furnace.
Two (2) 1/2" NPT x 3/8" NPT reducer bushings can be found in the paper
bag supplied in the LP gas conversion kit. These will only be used if the
gas supply valve doesn't match the gas valve.
Data subject to change without prior notice. | 05.2018
Quantity
1
3/5/6/7 *
1
1
2
1
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