Desa M125TH Owner'S Manual Download Page 12

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112865-01A

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IGNITION CONTROL ASSEMBLY

WARNING: High voltage!

Fuse

Fuse Cover

Fuse Clips

Unplug heater.

Remove control cover screws (2) using phillips screwdriver to
expose ignition control assembly (see Figure 11, page 9).

Remove fuse cover.

Remove fuse from fuse clips.

Replace with new fuse (DESA Heating Products part number
105880-02). Do not substitute a fuse with a higher current rat-
ing. Use Bussmann GMA-10 or equivalent.

Replace fuse cover.

Replace control cover (see Figure 11, page 9).

PUMP ROTOR

(Procedure if Rotor is Binding)

Remove upper shell (see Upper Shell Removal, page 8).

Remove fan guard.

Remove filter end cover screws using 5/16" nut driver (see
Figure 18).

Remove filter end cover and air filters.

Remove pump plate screws using 5/16" nut-driver.

Remove pump plate.

Remove rotor, insert, and blades (see Figure 18).

Check for debris in pump. If debris is found, blow out with
compressed air.

Install insert and rotor.

10. Check gap on rotor. Adjust to .003"/.004" (.076/.101 mm) if

needed (see Figure 19).

Note:

Rotate rotor one full turn to ensure the gap is .003"/.004"

(.076/.101 mm) at tightest position. Adjust if needed.

11. Install blades, pump plate, air filters, and filter end cover.

12. Replace fan guard and upper shell (see Upper Shell Removal,

page 8).

13. Adjust pump pressure (see Pump Pressure Adjustment, page 9).

Note:

If rotor is still binding, proceed as follows.

SERVICE PROCEDURES

Continued

Figure 18 - Rotor Location

Insert

Blade

Rotor

Pump Plate

Air Intake
Filter

Air Output
Filter

Filter End
Cover

Gap Adjusting Screw

Rotor

Blade

.003"/.004"
(.076-.101 mm)
Gap Measured
With Feeler
Gauge

Gap Adjusting Screw
Figure 19 - Gap Adjusting Screw Locations

Sandpaper

Figure 20 - Sanding Rotor

SERVICE PROCEDURES

Figure 21 - Replacing Fuse

14. Perform steps 1 through 6.

15. Place fine grade sandpaper (600 grit) on flat surface. Sand ro-

tor lightly in “figure 8” motion four times (see Figure 20).

16. Reinstall insert and rotor.

17. Perform steps 10 through 12.

Summary of Contents for M125TH

Page 1: ...OR 5 STORING TRANSPORTING OR SHIPPING 5 PREVENTATIVE MAINTENANCE SCHEDULE 6 TROUBLESHOOTING 7 SERVICE PROCEDURES 8 SPECIFICATIONS 13 REPLACEMENT PARTS 13 TECHNICAL SERVICE 13 ACCESSORIES 13 ILLUSTRATED PARTS BREAKDOWN AND PARTS LIST 14 WHEELS AND HANDLE PARTS LIST 16 WIRING DIAGRAM 16 OWNER S REGISTRATION FORM 17 WARRANTY AND REPAIR SERVICE 20 Save this manual for future reference Save this manual...

Page 2: ...ition exception the fuel reservoir integral with the heater unit g Whenever possible fuel storage shall be confined to ar eas where floor penetrations do not permit fuel to drip onto or be ignited by a fire at lower elevation h Fuel storage shall be in accordance with the authority hav ing jurisdiction Use only the electrical voltage and frequency specified on model plate Heater must be grounded U...

Page 3: ...ause the ignition control assembly to shut down heater Foreign matter may also require heater s fuel system to be frequently cleaned WARNING Use only kerosene 1 2 diesel fuel oil JET A or JP 8 fuels to avoid risk of fire or explo sion Never use gasoline oil drained from crank cases naphtha paintthinners alcoholorotherhighly flammable fuels VENTILATION WARNING Provide a fresh air opening of at leas...

Page 4: ...ed into nuts in the shroud Push the handle completely into the shroud 7 Tighten all scews THEORY OF OPERATION The Fuel System The air pump forces air through the air line The air is then pushed through the nozzle This air causes fuel to be lifted from the tank A fine mist of fuel is sprayed into the combustion chamber The Air System The motor turns the fan The fan pushes air into andaroundthecombu...

Page 5: ...peat steps under To Start Heater OPERATION IMPORTANT Review and understand the warnings in the Safety Information section page 2 They are needed to safely operate this heater Follow all local ordinances and codes when using this heater WARNING Before operating heater or any appli ance from a portable generator verify that generator has been properly connected to earth ground Im proper grounding or...

Page 6: ...9 See Fan page 8 WARNING Never service heater while it is plugged in operating or hot Severe burns and electrical shock can occur Item Fuel tank Air output and lint filters Air intake filter Fuel filter Ignitor Fan blades Motor How Often Flushevery150 200hoursofoperationorasneeded Replace every 500 hours of operation or once a year Wash and dry with soap and water every 500 hours of operation or a...

Page 7: ... CAUSE 1 No power to heater 2 ON OFF switch not in the ON position 3 Thermostat setting is too low 4 Bad electrical connection between motor and ignition control assembly or ignition control assembly and power cord 5 Binding pump rotor 6 Blown fuse GMA 10A on ignition con trol assembly 7 Defective ignition control assembly 8 Defective motor 1 No fuel in tank 2 Pump pressure incorrect 3 Dirty fuel ...

Page 8: ...or shaft 3 Slip fan off motor shaft 4 Clean fan using a 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 7 7 Place setscrew on flat of shaft Tighten setscrew firmly 40 50 inch pounds 4 5 5 6 n m 8 Replace upper shell AIR OUTPUT AIR INTAKE AND LINT FILTERS 1 Remove upper shell see Figure 5 2 Remove...

Page 9: ...ions below for correct pressure see Figure 10 6 Remove pressure gauge Replace pressure gauge plug in filter end cover SERVICE PROCEDURES Continued Figure 9 Pressure Gauge Plug Removal Pressure Gauge Figure 10 Adjusting Pump Pressure Relief Valve Pump Model Pressure 125TH 6 0 PSI FUEL FILTER 1 Removecontrolcoverscrewsusingmediumphillipsscrewdriver 2 Remove control cover 3 Pull upper fuel line off f...

Page 10: ...mbly Combustion Chamber Photocell Bracket Photocell Assembly Air Line Hose Fuel Line Hose Ignitor Wire Ignitor Nozzle Adapter Bracket Ignition Control Assembly Control Cover Photocell Bracket Ignitor Nozzle Adapter Bracket Ignitor Element Combustion Chamber Nozzle Adapter Bracket Opening Figure 13 Ignitor Replacement SERVICE PROCEDURES Continued 9 Carefully guide ignitor into opening in nozzle ada...

Page 11: ...Combustion Chamber Photocell Bracket Air Line Hose Nozzle Adapter Bracket Figure 15 Removing Nozzle Adapter Assembly Nozzle Adapter Assembly Combustion Chamber Figure 16 Nozzle and Nozzle Adapter Nozzle Face Nozzle Nozzle Sleeve Nozzle Adapter Air Line Fitting Fuel Line Fitting SERVICE PROCEDURES FUEL AND AIR LINE REPLACEMENT AND PROPER ROUTING 1 Remove upper shell see Upper Shell Removal page 8 2...

Page 12: ... see Figure 18 8 Check for debris in pump If debris is found blow out with compressed air 9 Install insert and rotor 10 Check gap on rotor Adjust to 003 004 076 101 mm if needed see Figure 19 Note Rotate rotor one full turn to ensure the gap is 003 004 076 101 mm at tightest position Adjust if needed 11 Install blades pump plate air filters and filter end cover 12 Replace fan guard and upper shell...

Page 13: ...ur address model and serial numbers of your heater how heater was malfunctioning purchase date Usually we will ask you to return the part to the factory PARTS NOT UNDER WARRANTY Contactauthorizeddealersofthisproduct Iftheycan tsupplyoriginal replacement part s call DESA Heating Products at 1 866 672 6040 for referral information Parts dealers are listed in the Authorized Service Center booklet sup...

Page 14: ...125TH RH125TH ILLUSTRATED PARTS BREAKDOWN Models M125TH and RH125TH Motor and Pump Assembly 10 11 10 17 10 16 10 15 10 14 10 18 10 12 10 10 10 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 13 1 13 3 23 19 9 10 11 12 15 25 13 24 29 30 31 34 42 32 41 14 36 26 39 13 16 2 43 23 5 4 6 18 7 8 44 27 20 22 21 28 33 40 37 35 2 38 7 2 7 1 7 3 7 4 17 ...

Page 15: ... 10 13 M12461 31 Screw 10 32 x 1 4 10 14 M12244 1 Output Filter 1 10 15 M11637 Lint Filter 1 10 16 104096 01 Fitting Straight Nylon Barb 1 10 17 M8643 Blade 4 10 18 M12461 31 Screw 10 32 x 1 6 11 M50631 Rubber Bumper 2 12 101206 01 Motor Mounting Bracket 1 13 M11084 29 Screw 10 16 x 3 4 11 14 104068 02 Ignition Control Assembly 1 15 NTC 4C Hex Lock Nut 1 4 20 2 16 108460 01 Fan Guard 1 17 M27417 D...

Page 16: ... 108468 01 Washer 2 7 107426 01 Wheel Kit Contains 2 2 Wheels and Cap Nuts 8 M28526 Cap Nut 2 WHEELS AND HANDLE WIRING DIAGRAM WHEELS AND HANDLE WHEELS AND HANDLE PARTS LIST 1 2 6 5 7 8 3 4 WIRING DIAGRAM Power Plug 120V 60Hz Blue Blue White Photocell Ignition Control Assembly Green Black Black Green Red Black White White Motor Thermostat Photocell Photocell Ignitor Motor Return AC Neutral L2 120V...

Page 17: ... Other ___________________________________ 12 Who selected the product Male Female Both 13 Level of Education of Purchaser High School Vocation Technical School Some College Completed College Graduate School 14 Age of Purchaser Under 20 20 29 30 39 40 49 50 59 60 or Over 15 Buyer s total annual household income Under 19 999 20 000 to 34 999 35 000 to 49 999 50 000 to 74 999 75 000 to 99 999 100 00...

Page 18: ...2701 Industrial Drive P O Box 90004 Bowling Green KY 42102 9004 Postage Required TAPE TAPE ...

Page 19: ...FORCED AIR HEATERS PROPANE TANK TOP HEATERS PROPANE AND NATURAL GAS GARAGE HEATERS PROPANE CONVECTION HEATERS PORTABLE KEROSENE FORCED AIR HEATERS PROPANE PATIO HEATERS PROPANE AND NATURAL GAS CHIMENEAS OTHER OUTDOOR HEATING PRODUCTS ...

Page 20: ...tained free of charge Send a self addressed stamped envelope to the address listed below List the heater model number and the date located in the lower right corner of this page A service manual can be purchased from the address listed below Send a check for 5 00 payable to DESA Heating Products When writing for information regarding your heater be sure to include the model number and serial numbe...

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