Slant/Fin CHS Series Manual

Natural to lp conversion kit

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CHS 85-250

NATURAL TO LP CONVERSION INSTRUCTIONS:

Version Date: 2015-05-12

Kit Number:

81 8124 000

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

proper 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.

Slant/Fin CHS boilers are factory equipped to operate with Natural Gas.

PROPANE the specified LP-orifice must be installed between the Venturi and Gas Valve. The orifice size is stamped

into each orifice; ensure the orifice being used corresponds to the boiler model being converted (see table below). Use

the procedures outlined in these instructions to fully complete the Natural Gas to LP conversion.

Kit Contents:



Natural to LP Conversion Instructions (81 8167 000)



Natural to LP Conversion Decal (81 8169 000)



T25 Torx Wrench (81 8157 000)



LP-orifices (see below)

LP-orifice Identification:

Boiler Model No.

CHS-85

CHS-110

CHS-155, CHS-175, CHS-200, CHS-250

This conversion kit CANNOT be used to convert Slant/Fin boiler models not referenced in

these instructions. Contact Slant/Fin for the Natural Gas to LP conversion kit and instructions

for other models.

Failure to install the correct LP-orifice 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.

Size (mm)

ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE

LP-orifice

Part No.

4.15

81 8028 000

5.2

81 8026 000

6.2

81 8027 000

BEFORE OPERATING WITH

ID Stamp

415

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Summary of Contents for Slant/Fin CHS Series

Page 1 81 8026 000 CHS-155, CHS-175, CHS-200, CHS-250 81 8027 000 This conversion kit CANNOT be used to convert Slant/Fin boiler models not referenced in these instructions. Contact Slant/Fin for the Natural Gas to LP conversion kit and instructions for other models.
Page 2: Gas Valve And Burner Setup
1.0 Installing the Orifice 1. Turn the 120VAC power supply off to the boiler. Combustion Blower 2. Turn gas supply “shut off valve” off. 3. Remove the front cover from the unit. 4. Remove internal air-inlet piping from the boiler. Cork Gasket 5.
Page 3 Gas Line Pressure The boiler gas valve is equipped with a line pressure test port; see Figure 2-1. Use the following procedure to measure the gas line pressure to the boiler to ensure it falls within the range given in Table 2-1: 1.
Page 4 4. Operate the unit at the minimum modulation rate (Table 2-2). Ensure the combustion remains smooth and CO and CO values are lower than the values obtained during maximum modulation (Table 2-1). If not, do not adjust further, contact Slant/Fin for assistance. Failure to perform the flue gas analysis and adjustment may result in erratic and unreliable burner operation, leading to reduced efficiency, increased fuel consumption, reduced component life, heat exchanger combustion deposits, and general unsafe operation.
Page 5 Figure 2-1 Gas Valve and Venturi Assembly (model CHS 85-110 illustrated) Gas Valve DO NOT Remove Manifold Pressure Line Pressure Test Port Test Port Throttle / Input Adjustment Screw Venturi 3.0 Labeling As the certified installer of the LP Conversion Kit, you must indicate on the boiler that it has been converted for use with Propane (LP) Gas: 1.

This manual is also suitable for:

Chs-155 Chs-85 Chs-110 Chs-175 Chs-200 Chs-250