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www.Laars.com

Document 4288D

The FT Series, Wall Combi, Gas Conversion Kit

pg 1 of 4

The FT Series, wall combi, condensing boiler is 

configured for Natural Gas (NG) from the factory. 

 

A Natural Gas to Propane Conversion Kit is included 

with every FT.  The gas conversion kit will show you 

how to convert your FT  boiler to propane gas. If your 

FT does not have the bag containing the conversion 

kit, a replacement kit can be obtained. Contact the 

manufacturer and request a replacement conversion kit.

NOTICE

If your installation altitude is greater than 2000 ft, check 

that the ‘High Altitude’ Installer Setting has been adjusted 

to suit your installation altitude. Refer to Section 4.12 of the 

Installation and Operation Instructions (Document 1318).

WARNING

This gas 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. The information in these 

instructions must be followed to minimize the risk of fire or 

explosion or to prevent property damage, personal injury 

or death. 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.Installation must conform 

to local codes and the latest edition of the National Fuel 

Gas Code, ANSI Z223.1 and CAN-B149.1. Failure to 

follow instructions could result in serious injury or property 

damage. The qualified agency performing this work 

assumes responsibility for gas conversion.

CAUTION

This combination boiler has already been set to burn natural 

gas, but can be converted to burn LP gas. Before placing the 

combination boiler into operation, verify that the type of gas 

supplied to your combination boiler.  

Steps 1 thru 25
1.  

  Turn 

OFF

 the FT.   The 

ON / OFF

 button 

  is located at 

the bottom left of the Control Display. 

2. 

 

  Turn 

OFF

 the GAS

 and

 WATER supply to the FT (valves 

are located on the plumbing pipes.)

3.  

 

   

Using a Phillips screwdriver, remove the 4 screws on the 
front cover. See Figure A.

4. 

  Locate the Gas Inlet Pipe at the top left of the unit as 
shown in Figure A, and loosen the Brass Fittings at both 
ends of the Gas Inlet Pipe. 

5. 

 

Completely unthread the brass fitting on the blower end of 
the Gas Inlet Pipe and then carefully swing the Gas Inlet 
Pipe to the left or right, just enough so that it is out of the 
way. See Figure B. 

6. 

  

Remove the existing natural gas nozzle or orifice. If your 
unit is a 199, note that the flat side of the orifice is towards 
the blower. Save the packing for re-use.  See Figure C.

7. 

 

Install the new LP (propane) nozzle or orifice. Re-use the 
packing from previous. 

8. 

 

Return the Gas Inlet Pipe to its original position and tighten 
both of the brass fittings. 

ON / OFF

H2373800D

Model

Natural Gas (NG) part #

Propane Gas (LP)  part #

FTCW140

 

FT1412N

 

FT1412P

FTCW199

FT1780

FT1802

Nozzle

Orifice

Kit # R20770     

Table A.    Gas Conversion Parts

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