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EFW-285
NATURAL GAS TO PROPANE CONVERSION INSTRUCTIONS:
Version Date: 2023-08-29
Kit Number:
560000283500
This conversion kit shall be installed by a qualified service agency in accordance with
the manufacturer's instructions and all applicable codes and requirements of the
authority having jurisdiction. If the information in these instructions is not followed
exactly, a fire, an explosion or production of carbon monoxide may result causing
property damage, personal injury, or loss of life. The qualified service agency is
responsible for the proper installation of this kit. The installation is not proper and
complete until the operation of the converted appliance is checked as specified in the
manufacturer's instructions supplied with the kit, which necessitates the use of a
calibrated CO
/O
and CO combustion analyzer.
2
2
HTP boilers are factory set to operate with Natural Gas. BEFORE OPERATING WITH PROPANE, the specified
LP-orifice must be installed. The orifice size is stamped into orifice; ensure the orifice being used corresponds to the
boiler model being converted. Use the procedures outlined in these instructions to fully complete the Natural Gas to
Propane conversion for model EFW-285WBN.
Kit Contents:
•
Natural Gas to Propane Conversion Instructions (420020243500)
•
Natural Gas to Propane Conversion Decal (99986947)
•
5.2 mm LP-orifice (99985798)
This conversion kit CANNOT be used to convert HTP appliance models not referenced in these
instructions. Contact HTP for the Natural Gas to Propane conversion kit and instructions for
other models.
Failure to apply these instructions properly may result in dangerous Carbon Monoxide levels,
fire or explosion leading to property damage, personal injury, or death.
Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your boiler is not
installed in a pit or similar location that will permit heavier than air gas to collect. Local Codes may require
appliances fueled with LP gas be provided with an approved means of removing unburned gases from the
room. Check your local codes for this requirement.
EFW-285 NG-LP Conversion Instructions
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE
420020243500
1
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Summary of Contents for HTP EFW-285
- Page 1 CO and CO combustion analyzer. HTP boilers are factory set to operate with Natural Gas. BEFORE OPERATING WITH PROPANE, the specified LP-orifice must be installed. The orifice size is stamped into orifice; ensure the orifice being used corresponds to the boiler model being converted.
-
Page 2: Changing The Orifice
14. Reconnect the feedback hose between Air-inlet Pipe and Gas Valve. 15. Turn gas on and check for leaks. Proceed to Section 2.0 Gas Valve and Burner Setup. Figure 1-1 Installation of LP-Orifice Combustion Blower Gas Valve Rubber Gasket LP-orifice Venturi Air-inlet Pipe EFW-285 NG-LP Conversion Instructions... -
Page 3: Gas Valve And Burner Setup
CO. Adjustments may only be performed if the gas line pressure is maintained above minimum levels throughout the duration of the test (see Table 2-1). Failure to follow these instructions may result in serious injury or death. EFW-285 NG-LP Conversion Instructions... - Page 4 High Fire Low Fire 3.5-10.5” WC 8-13” WC 8.9-9.5% 8.5-9.1% <175ppm 10.4-11.0% 10-10.6% <175ppm Note: The CO at the Low Fire rate must be set lower than the CO at the High Fire rate by 0.4-0.8%. EFW-285 NG-LP Conversion Instructions...
- Page 5 Offset Screw – used to set Remove access cover, adjust from top. combustion at Low Fire (use 2 mm hex wrench) Throttle Screw – used to calibrate combustion at High Fire Gas Valve Line Pressure Test Port EFW-285 NG-LP Conversion Instructions...
- Page 6 (see Figure 3-2). Figure 3-1 Update the Rating Plate Decal May 5, 2016 Figure 3-2 Conversion Decal John Smith EFW-285 NG-LP Conversion Instructions...
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