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FAQ

Welcome to M & S Service and Supply Company's Frequently Asked Questions page.

Forced Air Heater

• How do I service my Forced Air Heater?

Question 02

Question 03

Servicing your Forced Air Heater - Download PDF

UPPER SHELL REMOVAL
  1. Remove screws along each side of heater using 5/16" nut-driver. These screws attach upper and lower shells together.
  2. Lift upper shell off.
  3. Remove fan guard.

Figure 5 - Upper Shell Removal
FAN
IMPORTANT: Remove fan from motor shaft before removing motor from heater. The weight of the motor resting on the fan could damage the fan pitch.
  1. Remove upper shell (see above).
  2. Use 1/8" allen wrench to loosen setscrew which holds fan to motor shaft.
  3. Slip fan off motor shaft.
  4. Clean fan using soft cloth moistened with kerosene or solvent.
  5. Dry fan thoroughly.
  6. Replace fan on motor shaft. Place fan hub flush with end of motor shaft (see Figure 6).
  7. Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds).
  8. Replace fan guard and upper shell.

Figure 6 - Fan Cross Section
AIR OUTPUT, AIR INTAKE, AND LINT FILTERS
IMPORTANT: Do not oil filters.
  1. Remove upper shell (see above).
  2. Remove filter end cover screws using 5/16" nut-driver.
  3. Remove filter end cover.
  4. Replace air output and lint filters.
  5. Wash or replace air intake filter.
  6. Replace filter end cover.
  7. Place setscrew on flat of shaft. Tighten setscrew firmly (40-50 inch-pounds).
  8. Replace fan guard and upper shell.

Figure 7 - Air Output, Air Intake, and Lint Filters
PUMP PRESSURE ADJUSTMENT
IMPORTANT: Do not oil filters.
  1. Remove pressure gauge plug from filter end cover..
  2. Install accessory pressure gauge (part number HA1180).
  3. Start heater. Allow motor to reach full speed.
  4. Adjust pressure. Turn relief valve to right to increase pressure. Turn relief valve to left to decrease pressure. See specifications at right for correct pressure for each model.
  5. Remove pressure gauge. Replace pressure gauge plug in filter end cover.

Figure 8 - Pressure Gauge Plug Removal

Figure 9 - Adjusting Pump Pressure
FUEL FILTER
  1. Remove side cover screws using 5/16" nut-driver.
  2. Remove side cover.
  3. Pull upper fuel line off fuel filter neck.
  4. Carefully pry bushing, fuel filter, and lower fuel line out of fuel tank.
  5. Wash fuel filter with clean fuel and replace in tank.
  6. Attach upper fuel line to fuel filter neck.
  7. Replace side cover.

Figure 10 - Fuel Filter Removal
SPARK PLUG
  1. Remove upper shell.
  2. Remove fan.
  3. Remove spark plug wire from spark plug.
  4. Remove spark plug from burner head using 13/16" open-end wrench.
  5. Clean and regap spark plug electrodes as follows:
    • 110,000, 150,000, 155,000 B.T.U. Models = .075" gap
    • 165,000 B.T.U. Model = .085" gap
  6. Install spark plug in burner head.
  7. Attach spark plug wire to spark plug.
  8. Replace fan.
  9. Replace fan guard and upper shell.

Figure 11 - Spark Plug Removal

Figure 12 - Spark Plug Gap
NOZZLE
  1. Remove upper shell.
  2. Remove fan.
  3. 3. Remove fuel and air line hoses from burner head.
  4. Remove spark plug wire from spark plug.
  5. Remove spark plug from burner head using 13/16" open-end wrench.
  6. Remove three screws using 5/16" nut-driver and remove burner head from combustion chamber.
  7. Place burner head into vise and lightly tighten.
  8. Carefully remove nozzle from burner head using 5/8" socket wrench (see Figure 14).
  9. Blow compressed air through face of nozzle. This will free any dirt in nozzle area.
  10. Inspect nozzle seal for damage.
  11. Replace nozzle into burner head and tighten firmly (80-110 inch-pounds).
  12. Attach burner head to combustion chamber.
  13. Install spark plug in burner head.
  14. Attach spark plug wire to spark plug.
  15. Attach fuel and airline hoses to burner head.
  16. Replace fan.
  17. Replace fan guard and upper shell.

Figure 13 - Removing Burner Head

Figure 14 - Removing Nozzle
PUMP ROTOR
(Procedure if rotor is binding)
  1. Remove upper shell.
  2. Remove filter end cover screws using 5/16" nut-driver.
  3. Remove filter end cover and air filters.
  4. Remove pump plate screws using 5/16" nut-driver.
  5. Remove pump plate.
  6. Remove rotor, insert, and blades.
  7. Check for debris in pump. If debris is found, blow out with compressed air.
  8. Install insert and rotor.
  9. Check gap on rotor. Adjust to .003"/.004" if needed (see Figure 16).
    10. Note: Rotate rotor one full turn to insure the gap is .003"/.004" at tightest position. Adjust if needed.
  10. Install blades, pump plate, air filters, and filter end cover.
  11. Replace fan guard and upper shell.
  12. Adjust pump pressure (see page 7).
    13. Note: If rotor is still binding, pr oceed as follows.
  13. Perform steps 1 through 6 above.
  14. Place fine grade sandpaper (600 grit) on flat surface. Sand rotor lightly in “figure 8” motion four times (see Figure 17).
  15. Reinstall insert and rotor.
  16. Perform steps 10 through 12 above.

Figure 15 - Rotor Location

Figure 16 - Gap Adjusting Screw Locations

Figure 17 - Sanding Rotor

Question 02

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Question 03

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