Form RGM 433-CV/LN, Mfg No. 177854 (Revision 1), Page 17
NOTE: If the heater has been changed so that the controls are on the left side (Paragraph 9), their locations will
appear inverted.
Pressure
Switch
Flue
Collar
Flame Sensor
Transformer
Limit Control Location (located in
the heat exchanger compartment;
remove louvers to access)
Venter Motor
and Wheel Assy
Fan
Motor
Gas
Valve
Pressure Tap (for tubing
connection to the pressure switch)
Circuit Board (See LED
Codes on page 14 or 19.)
Ignitor
Burner/Manifold
Assembly
Flame
Rollout
Switch
Figure 10 - Location of Controls - View of
the Control Compartment
20. Burner Removal and
Cleaning
Instructions for Burner Removal (See Figure 10)
1. Shut the gas supply off ahead of the combination valve.
2. Turn off electric supply.
3. Remove the access panel; the vertical burner assembly is visible on
the left side of the heater.
4. Open the union in the gas line before the gas valve.
5. Disconnect the flame sensor wire and the ignitor wire.
6. Remove the screws that attach the burner assembly to the front panel
and inner wall. Pull the manifold/burner assembly out of the heater.
Clean the Burners (requires a wire brush,
cleaning cloth, and an automotive type aerosol
degreaser or refrigerant coil cleaner)
CAUTION: Use of eye protection is recommended.
Excessive dirt buildup on and inside the ports on the burner could
cause fuel gas to spill out of the back of the burner tube. Fuel gas
spilling out of the back of the burner tube will cause gas odor inside
the building, and if not corrected, could eventually cause a fire/explo-
sion hazard. To prevent fuel gas spilling from the back of the burners,
clean the burner ports at least annually. Remove any soot deposits from
the burner with a wire brush. Clean the ports with an aerosol degreaser
and/or compressed air. Wipe the inside of the burner tube clean. (Clean-
ing the burner with an aerosol degreaser is highly recommended as the
degreaser will retard future buildup of dirt.)
Inspect the cleaned burner for any damage or deterioration. If the burner
has any damage or signs of deterioration, replace it.
Re-assemble the heater and test for proper operation.
21. Burner Orifices
Heaters are shipped with orifices of proper size and type for gas and
altitude specified on the order. When ordering replacement orifices,
give BTUH content, specific gravity of gas, and altitude, as well as the
model and serial number of the heater.
22. Ignition System
To access the ignition system, follow Steps 1-3 in Paragraph 20.
Ignitor - Refer to Figure 10 and locate the ignitor (on the side of the
burner rack). Disconnect the wire; remove the screw and the ignitor.
Clean the ignitor assembly with an emery cloth.
Spark gap must be maintained to 1/8". See Figure 11.
Figure 11 - Ignitor
Assembly
Front View
showing Spark
Gap Measurement
IMPORTANT: When re-assembling, the brown ground wire must re-
main attached to the ignitor.
CAUTION: Due to high voltage on the spark wire
and electrode, do not touch when energized. See
Hazard Levels, page 1.
