Gas Conversion
Kits and
Instructions
INSTALLATION FORM RGM 432/433-GC (Version D.1)
Obsoletes Form RGM 432/433-GC (Version D)
APPLIES TO: Model FT and Model SFT
All gas conversion must be done by a qualified service person in accordance with these instructions and in compliance with all codes and requirements. In Canada, gas conversion shall be carried out in accordance with the requirements of the Provincial Authorities having jurisdiction and in
accordance with the requirements of the CAN/CGA-B149.1 and .2 installation code.
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause
property damage, injury, or death. For assistance or additional information, consult a qualified
installer, service agency, or the gas supplier.
FOR YOUR SAFETY
What to do if you smell gas:
• Do not try to light any appliance.
• Do not touch any electrical
switch; do not use any phone
in your building.
• Immediately call your gas supplier from a neighbor's phone.
Follow the ga s supplier's
instructions.
• If you cannot reach your gas
supplier, call your fire department.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other
appliance.
DANGER: The conversion kit is to be
selected and installed by a qualified
service person in accordance with
these instructions and in compliance
with all codes and requirements of
authorities having jurisdiction. Failure
to follow instructions could result in
death, serious injury and/or property
damage. The qualified agency
performing this work assumes
responsibility for this conversion.
HAZARD INTENSITY LEVELS
1. DANGER: Failure to comply will result in severe personal injury or death
and/or property damage.
2. WARNING: Failure to comply could result in severe personal injury or death
and/or property damage.
3. CAUTION: Failure to comply could result in minor personal injury and/or
property damage.
Application and Kit Selection
The gas conversion kits in these instructions are for Model FT and Model SFT
heaters equipped with a single-stage valve. See pages 6 and 7 for conversion kit
components.
Be sure that the kit selected applies to the model and size being converted.
DANGER: The gas burner in this gas-fired equipment is designed
and equipped to provide safe and economically controlled
complete combustion. However, if the installation does not permit
the burner to receive the proper supply of combustion air,
complete combustion may not occur. The result is
combustion which produces carbon monoxide, a poisonous gas
that can cause death.
Safe operation of indirect-fired gas burning equipment requires
a properly operating vent system which vents all flue products
to the outside atmosphere. FAILURE TO PROVIDE PROPER
VENTING WILL RESULT IN A HEALTH HAZARD WHICH
COULD CAUSE SERIOUS PERSONAL INJURY OR DEATH.
On separated combustion Model SFT heaters, install either the
horizontal or vertical combustion air/vent system illustrated in
the heater installation manual, using the concentric adapter
supplied. For installations of either Model FT or Model SFT,
always comply with the combustion air requirements in the
installation codes and instructions. Model FT units installed in
a confined space must be supplied with air for combustion as
required by Code and in the heater installation manual.
Combustion air at the burner should be regulated only by
manufacturer-provided equipment. NEVER RESTRIC
OTHERWISE ALTER THE SUPPLY OF COMBUSTION AIR
TO ANY HEATER. MAINTAIN THE VENT SYSTEM IN
PROPERLY OPERATING CONDITION.
incomplete
T OR
Mfg No. 148066, Page 1
Gas Conversion Instructions
1. Check kit contents for agr eement with the parts list. A parts
list for each kit is on pages 5-6.
The kits listed in this manual are intended for use on units that
will be operated at sea level. Conversion of a unit using these
kits will not alter the input rate. Refer to the rating plate on the
heater for input rate and other appropriate information.
2. Turn off the gas supply at a shutoff valve upstream of the
combination valve and turn off the electrical supply. Open
the control access panel.
3. Select and Install the Regulator Spring Kit (valve conver-
sion kit)
Depending on the size and gas type, there will be one or two
regulator spring kits in the gas conversion kit. The manufacturer of the regulator spring kit must be the same as the manufacturer of the gas valve. Look at the gas valve and make note
of the name of the manufacturer.
If there are two regulator spring kits in the gas conversion kit,
select the one whose manufacturer matches the name on the gas
valve.
If there is only one regulator spring kit, verify to be sure that the
names match. If the names of the manufacturers do not match,
do not install the spring regulator kit. Contact your distributor
to determine the correct spring regulator kit.
To install the spring regulator conversion kit, follow the valve
manufacturer's installation instructions that are included with
the kit. After a new regulator spring kit is installed, it is necessary to adjust the spring for the correct manifold pressure. This
adjustment can only be made after the heater is in operation.
Instructions are included in Step No. 8.
WARNING: Manufacturer of regulator spring kit
and gas valve must be the same. Spring kits of
different manufacturers are not interchangeable,
and each spring kit must be used only in the valve
for which the kit is designated.
WARNING: The operating valve is the primary
safety shutoff. The gas supply line must be free of
dirt or scale before connecting the unit.
4. Install Burner Orifices
WARNING: Do not attempt to drill orifices. Use
factory-supplied orifices only.
(NOTES: Kits that apply to various sizes of heaters include the quantity of
burner orifices required for the largest size of heater. When converting the
smaller sizes, there will be extra burner orifices which will not be used.)
MODEL FT Instructions (See Figure 1)
Remove the screws that retain the manifold and control assembly (See
Figure 1). With the manifold and control assembly removed from the
heater, unscrew all of the existing orifices and replace with the orifices
included in the conversion kit.
MODEL SFT Instructions (See Figures 2 and 3)
a) Remove the Manifold
Disconnect the union on the outside of the unit and remove the gas
pipe from the inlet of the gas valve.
Figure 1 - MODEL FT Control Compartment
NOTE: If the heater has been changed so that the controls are on the left side, the location of the burner and controls will
appear inverted. On Sizes 60-300, the ignitor must still be toward the bottom of the heater with the flame sensor toward the
top.
Form 432/433-GC, Page 2
On the burner box end of the flexible hose, loosen the hose clamp. Slide the hose off the collar.
Disconnect the silicone tubing from the static tap on the burner box cover.
Remove the manifold seal plate and manifold cover plate. Remove the burner box cover. The manifold and
burner rack assembly are visible.
Locate the screws that attach the manifold to the burner rack assembly. Remove the screws and slide the
manifold out of the heater.
b) Change Orifices
Unscrew all of the existing orifices and replace with the orifices included in the conversion kit.
Figure 2 - MODEL SFT Control Compartment
Follow the valve manufacturer's
The burner box assembly; remove
the burner box cover on the right.
Refer to Figure 2 above for the
location of the burner box.
Manifold
with
Burner
Orifices
Gas Valve
instructions to install the
regulator spring kit.
Figure 3 - Removing the Manifold Assembly of a
MODEL SFT HEATER
For clarity , the heater cabinet and other parts are not
illustrated; do not remove the burner box from the heater. To
change burner orifices, remove only the manifold seal
plate, manifold cover plate, burner box cover, and
manifold assembly.
Burner Box
Cover
Static Pressure Tap
Manifold Cover Plate
Manifold Seal Plate
Mfg No. 148066, Page 3
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