Figure 43 Gas valve and fan components - EX 700, 850
The High Fire (gas-air ratio) adjustment screw will have to be adjusted to attain optimum
combustion results whenever fuel conversion is undertaken, however, no mixture adjustment shall
be performed unless done by a qualified technician using properly functioning and calibrated
combustion analyzing equipment.
1. Ensure you are installing the correct fuel conversion kit for your boiler. Compare the boiler
model number with the Kit # found in Table 10 .
2. Carefully follow the procedures of the fuel conversion instructions on:
a. Fuel Conversion
b. Combustion Testing and Adjustment
c. Placing conversion labels associated with the new fuel onto the boiler.
Fuel conversion kit part numbers
Model Number Natural Gas to Propane Propane to Natural Gas
EX 400 P-1236 P-1235
EX 500 P-1238 P-1237
EX 700 P-1201 P-1200
EX 850 P-1203 P-1202
Table 10 Fuel Conversion Kits
6.3.2.1 Performing a fuel conversion on EX 400 and EX 500 appliances
The following steps document replacing the current orifice with the kit-supplied orifice. After
replacing the orifice, you will need to tune the gas valve.
1. Disconnect the power to the boiler, and close the gas shut-off valve.
2. Remove the front door and top cover from the boiler.
3. Remove the bolts of the elbow (mixer side) marked j(see image below).
4.
Remove the bolts of the elbow (gas valve side) marked k (see image below).
6.3.2 Performing a fuel conversion
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