MR HEATER MH50KR Kerosene Forced Air Heater

Product Information

• This is a Kerosene Forced-Air Heater available in various models: MH50KR, MH80KTR, MH140KTR, MH185KTR, and MH210KTR.
• It is designed for heating spaces efficiently using kerosene fuel and is suitable for outdoor and well-ventilated indoor use.

Specifications

• Model: MH50KR, MH80KTR
• Burn Rate: 50,000 Btu/hr (14.7 kW) for MH50KR, 80,000 Btu/hr (23 kW) for MH80KTR
• Fuel Rate: 0.37 gal/hr (1.4 L/hr) for MH50KR, 0.55 gal/hr (2.1 L/hr) for MH80KTR
• Electrical Input: 115V, 60Hz, 3.5a for MH50KR, 115V, 60Hz, 4a for MH80KTR
• Line Protection: 10 amps
• Min. Operating Voltage: 110V
• Pressure Setting: 3.5 psig (24 kPa) for MH50KR, 4.2 psig (29 kPa) for MH80KTR

Product Usage Instructions

Safety Precautions

It is crucial to follow all safety precautions to prevent fire hazards, personal injuries, or property damage:

• Never leave the heater unattended while burning.
• Adequate ventilation must be ensured to prevent carbon monoxide buildup.
• Do not store flammable liquids near the heater.
• Only use the heater in well-ventilated areas.
• Refer to the instruction manual for proper setup and operation.

Operating Instructions

1. Ensure the heater is placed on a stable and level surface away from combustible materials.
2. Use only No. 1-K kerosene fuel as specified by CSA.
3. Connect the heater to a grounded three-prong receptacle with appropriate line protection.
4. Follow the specific starting and operating instructions outlined in the manual for your model.
5. Monitor the heater during operation and never leave it unattended.

Frequently Asked Questions (FAQ)

Q: Can I use gasoline as fuel for this heater?

A: No, this heater is designed for use with No. 1-K kerosene fuel only. The use of gasoline or other flammable liquids can be dangerous and should be avoided.

Q: Is this heater safe to use indoors?

A: This heater is suitable for indoor use in well-ventilated areas. It is important to follow all safety instructions provided in the manual to prevent any hazards.

Q: What should I do if I smell gas while using the heater?

A: If you detect any gas or strange odors while operating the heater, immediately turn it off, ventilate the area, and contact a qualified service agency for assistance.

• READ   INSTRUCTIONS CAREFULLY: Read and follow all instructions. Place instructions in a safe place for future reference. Do not allow anyone who has not read these instructions to assemble, light, adjust, or operate the heater.
• WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury, or loss of life.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
• Service must be performed by a qualified service agency.
• This is an unvented portable heater. It uses air (oxygen) from the area in which it is used. Adequate combustion and ventilation air must be provided.

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!

• WARNING: YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS, SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU OPERATE THIS HEATER.
• GENERAL HAZARD WARNING: FAILURE TO COMPLY WITH THE PRECAUTIONS AND INSTRUCTIONS PROVIDED WITH THIS HEATER, CAN RESULT IN DEATH, SERIOUS BODILY INJURY AND PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE, EXPLOSION, BURN, ASPHYXIATION, CARBON MONOXIDE POISONING, AND/OR ELECTRICAL SHOCK.
• ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW THE INSTRUCTIONS SHOULD USE OR SERVICE THIS HEATER.
• IF YOU NEED ASSISTANCE OR HEATER INFORMATION SUCH AS AN INSTRUCTIONS MANUAL, LABELS, ETC. CONTACT THE MANUFACTURER.
• WARNING: CARBON MONOXIDE CAN KILL YOU USING A PORTABLE HEATER IN AN ENCLOSED AREA CAN PRODUCE DEADLY CARBON MONOXIDE.
• WARNING: NOT FOR HOME OR RECREATIONAL VEHICLE USE
• WARNING: FIRE, BURN, INHALATION, AND EXPLOSION HAZARD.
• KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING MATERIALS, PAPER, OR CARDBOARD, A SAFE DISTANCE AWAY FROM THE HEATER AS RECOMMENDED BY THE INSTRUCTIONS NEVER USE THE HEATER IN SPACES THAT DO OR MAY CONTAIN VOLATILE OR AIRBORNE COMBUSTIBLES, OR PRODUCTS SUCH AS GASOLINE, SOLVENTS, PAINT THINNER, DUST PARTICLES OR UNKNOWN CHEMICALS.
• WARNING: COMBUSTION BY-PRODUCTS PRODUCED WHEN USING THIS PRODUCT CONTAIN CARBON MONOXIDE, A CHEMICAL KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND BIRTH DEFECTS (OR OTHER REPRODUCTIVE HARM).
• THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER AND BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.

WARNING:

• DO NOT USE GASOLINE, NAPHTHA OR VOLATILE FUELS.
• STOP HEATER BEFORE ADDING FUELS.
• ALWAYS FILL OUTDOORS AWAY FROM OPEN FLAME.
• DO NOT USE EXTERNAL FUEL SOURCE.
• DO NOT OPERATE THE HEATER WHERE FLAMMABLE LIQUIDS OR VAPORS MAY BE PRESENT.
• DO NOT START HEATER WHEN CHAMBER IS HOT.
• DO NOT START THE HEATER WHEN EXCESS FUEL HAS ACCUMULATED IN THE CHAMBER.
• DO NOT PLACE COOKING UTENSILS ON TOP OF THE HEATER.
• PLUG ELECTRICAL CORD INTO A PROPERLY GROUNDED THREE-PRONG RECEPTACLE.

MH50KR & MH80KTR WARNING:

• Not suitable for use on wood floors or other combustible materials. When used the heater should rest on a suitable insulating material at least 1 inch thick and extend 3 feet or more beyond the heater in all directions.

SPECIFICATIONS

• CAUTION: CSA certified for use with only No. 1-K kerosene fuel.
• Factory Tested: Kerosene, Diesel #1 and #2, Fuel Oil #1 and #2, JP8 (Jet A Fuel)

OPERATING PRECAUTIONS

• This is a kerosene, direct-fired, forced air heater. Its intended use is primarily temporary heating of buildings under construction, alteration, or repair.
• Direct-fired means that all of the combustion products enter the heated space. Even though this heater operates very close to 100 percent combustion efficiency, it still produces small amounts of carbon monoxide.
• Carbon monoxide (called CO) is toxic. CO can build up in a heated space and failure to provide adequate ventilation could result in death. The symptoms of inadequate ventilation are:
• headache
• dizziness
• burning eyes and nose
• nausea
• dry mouth or sore throat
• Be sure to follow advice about ventilation in the Safety Precautions section.
• Forced Air means that a blower or fan pushes the air through the heater. Proper combustion depends upon this airflow; therefore, the heater must not be revised, modified, or operated with parts removed or missing.
• Likewise, safety systems must not be circumvented or modified to operate the heater.
• When the heater is to be operated in the presence of other people the user is responsible for properly acquainting those present with the safety precautions and instructions and of the hazards involved.

SAFETY PRECAUTIONS

1. Recommended for use with No.1-K kerosene fuel. Factory tested for use with No.2-K kerosene, No.1 or No.2 Diesel, No.1 or No.2 fuel oil, or JP8 Jet A fuel and these fuels may be used as well. Never use gasoline, biodiesel, oil drained from crankcases, naphtha, paint thinners, alcohol, or any other highly flammable fuels.
2. Check the heater thoroughly for damage. DO NOT operate a damaged heater.
3. DO NOT modify the heater or operate a heater that has been modified from its original condition.
4. Suitable for either outdoor or indoor use where adequate ventilation is provided. Never use in areas normally for habitation. Not for use where exposed to weather.
5. Use in well-ventilated areas, provide at least 2 sq. ft. (0.19 sq. m.) of opening near the floor and 2 sq. ft. (0.19 sq. m.) near the ceiling directly to outdoors. Increase air openings as marked for each additional heater.
6. Always keep combustibles, like paper and wood at least 8 ft. (2.4 m) from the heater outlet and 3 ft. (1.0 m) from the top, sides, and inlet. Locate 10 ft. (3.0 m) from canvas or plastic coverings and secure them to prevent flapping movement.
7. Caution: Due to the high surface and exhaust temperatures, adults and children must observe clearances to avoid burns or clothing ignition. Do Not Touch. Keep children, clothing, and combustibles away.
8. Install the heater such that it is not directly exposed to water spray, rain, and/or water.
9. Never use in areas normally for habitation and /or where children may be present.
10. Operate only on a stable, level surface. (MH50KR & MH80KTR – See wood floor warning).
11. Do not use it with ductwork. Do not restrict the inlet or exit.
12. Use only with electrical power specified. The electrical connection and grounding must comply with the National Electrical Code – ANSI/NFPA 70 (USA) and CSA C22.1 Canadian Electrical Code, Part 1 (Canada).
13. Use only a properly grounded 3-prong receptacle or extension cord.
14. Do not move, handle, or service while hot or in operation.
15. Use only under local, state (provincial), or national requirements, ordinances, and codes.

OPERATING INSTRUCTIONS UNPACKING

1. 1. Remove the heater from the carton.

2. 2. Remove all protective material that may have been applied to the heater for shipment.

3. Check the heater for possible shipping damage. If any damage is found immediately contact the manufacturer at 800-251-0001
   ASSEMBLY (For 140,000, 185,000, and 210,000 BTU/hr models only, see figure 1,) Wheels and handles are found in the shipping carton along with mounting hardware. The wheels, axle and mounting hardware are in a package. Tools required are a 5/16” nut driver, a 3/8” open or adjustable wrench, and standard pliers.

4. Assemble the wheels onto the wheel support as shown.

5. Install one of the cotter pins into the hole on one end of the axle.

6. Slide the large washer, then wheel onto the axle next to the cotter pin.

7. Slide the spacer onto the axle next to the wheel.

8. Slide the partially assembled axle through the wheel support frame.

9. Slide the spacer onto the axle next to the wheel support.

10. Slide the wheel, and then the large washer onto the axle and hold it in place with the remaining cotter pin.

11. Install the caps over the larger washers to finish the wheel assembly.

PREPARING FOR OPERATION

1. Check the heater for possible shipping damage. If any is found, immediately contact the manufacturer at 800-251-0001.

2. Follow all of the “Precautions”.

3. Fill the fuel tank with clean kerosene. In extremely cold weather, condensation may develop in the tank and it is recommended that a tablespoon of de-icer be added for each gallon (3.78 Liters) of fuel in the tank. When filling the heater, use at least 2 gallons (7.57 liters) of fuel. Be sure the heater is level and do not overfill. Use a funnel or can with a long fill spout.
   IMPORTANT: Before filling the fuel tank the first time or after extended storage periods, drain the fuel tank of any moisture or condensation.

4. Locate the heater at a safe distance from combustible materials.
   Models MH50KR & MH80KTR are not suitable for use on wood floors or other combustible materials. When used, the heater should rest on suitable insulating material at least 1 inch thick and extend 3 ft. or more beyond the heater in all directions.

HEATER START UP

• MH50KR: Plug the heater into a grounded 115V, 60 Hz, 1 Ø outlet.
  MH80KTR, MH140KTR, MH185KTR & MH210KTR: Turn the thermostat to the lowest setting, and make sure the “On/Off” switch is “Off”. Plug the heater into a grounded 115V, 60 Hz, 1 Ø outlet.

• Turn the thermostat to the highest setting. Start the heater by pushing the toggle switch to the “On” position (the light signifies the switch is in the “ON” position). Adjust the thermostat to the desired setting. The heater will cycle on/off as heat is required.

• EXTENSION CORD REQUIREMENTS: Up to 100’ (30.5m) use 16 awg. conductor. 101’ – 200’ (30.5 – 61.0m) use 14 awg. conductor.

For all models:

• In cold weather (below 10° F), starting may be improved by holding a finger over the vent hole of the pump adjustment screw cap until the heater starts.
• This unit is equipped with an interrupt circuit. The reset is integrated into the “On/Off” switch. If the unit does not start, toggle the switch to “Off”, and wait 5 min. and toggle the switch to “On”.

HEATER SHUT DOWN

• MH50KR: Unplug the heater from the power source.
• MH80KTR, MH140KTR, MH185KTR & MH210KTR: Push the On/Off” switch to the “Off” position. For extended shutdown, unplug the heater from the power source.
• RESTART AFTER SAFETY SHUTDOWN (MH50KR, MH80KTR, MH140KTR, MH185KTR & MH210KTR)
• MH50KR – Unplug unit. Wait 5 minutes. Plug back in. MH80KTR, MH140KTR, MH185KTR & MH210KTR – Toggle switch to the “OFF” position, and wait 5 minutes. Restart.

MAINTENANCE AND STORAGE

• WARNING. To prevent personal injury, unplug the heater from the wall outlet before servicing.
• For the maximum efficiency and trouble-free service, make the following periodic maintenance, cleaning, and inspections.

ADJUSTING PUMP PRESSURE

• Due to varying fuel viscosities and normal component wear the pump pressure on this heater may need to be adjusted.

IMPROPER PRESSURE ADJUSTMENT

ADJUSTMENT PROCEDURE

1. Fill the fuel tank.
2. Start heater.
3. Locate the pressure adjustment screw and pressure tap, pictured above, located on the back of the power pack assembly and accessible by the handle of the heater.
4. Remove the rubber cap over the fuel pressure adjustment screw.
5. Using a flat-bladed screwdriver, turn the pump pressure adjustment screw:
   • clockwise to increase pump pressure
   • counter-clockwise to decrease pump pressure
   • By using the installed pressure gauge you may quantitatively calibrate the pressure. The manufacturer’s recommended pump pressures are in the specifications chart on
6. The desired qualitative burner characteristics are that the nose cone in the combustion chamber should be cherry red with no dark spots and the flame should not extend beyond the nose cone.

• Problem: The heater does not have a strong consistent flame.
  • The heater smokes and spits raw fuel.
  • The nose cone does not get cherry red.
• Adjustment: Pump pressure is too low.
  • Turn the adjustment screw clockwise to increase pump pressure.
• Problem: Flame extends beyond the end of the heater.
• Adjustment: Pump pressure is too high.
  • Turn the adjustment screw counterclockwise to decrease pump pressure.

DAILY SCHEDULE

1. GENERAL. Make general visual inspection of the heater for loose or damaged parts. Check nuts and bolts to insure against looseness caused by vibration or rough handling. Damaged parts should be repaired or replaced before using the heater again. Check heater operation to be sure it is operating normally (See “Servicing” section for a description of normal operation).
2. FILTERS. Dirty air or fuel filters will cause an imbalance in the air-fuel mixture. The best indication that this condition exists is an increase in odors or difficulty getting your heater to ignite. This heater should never be operated without the filters in place. If required, clean filters as described under “500 Hours” and “Annual Schedules”.

500 HOUR SCHEDULE

1. AIR INTAKE FILTER. Remove and wash the filter element with a mild detergent, dry it thoroughly, and replace it. Do not oil the filter element. If your heater is used where there is considerable dust or dirt, clean it as often as necessary (approximately every 50 hrs.).
2. REMOVE DUST. Clean the heater twice a season (more often under dusty conditions). Remove accumulated dust from the transformer, burner, motor, and fan blades with compressed air. Wipe the area clean with a clean dry cloth. Inspect the area to ensure all foreign materials are removed, especially around the burner and combustion area.
3. CAD CELL. Clean the glass portion of the CAD cell with a soft dry cloth.
4. NOZZLE. Accumulation of dirt from fuel and carbon from the compressor vanes will eventually fill up the passages in the nozzle, resulting in a reduction of fuel and airflow. Pressure will gradually increase giving improper fuel-air mixture and excess odor and smoke. If this occurs, replace the fuel nozzle.
5. FUEL TANK. Clean twice a season (during frequently used periods, clean twice a month). Drain and flush the fuel tank with clean fuel oil.

ANNUAL SCHEDULE

1. AIR OUTPUT FILTER. Remove the air output filter and tap the contaminated side gently on a solid object to remove contaminates. Compressed air or liquids should not be used to clean this filter. Reinstall the cleaned filter in the filter body in the same position as it was when removed. If the filter appears extremely dirty, replace it with a new filter of the same type. When replacing the filter cover, be sure the gasket is firmly in place and the screws in the filter cover are tight to prevent air leaks.
2. FUEL FILTER. Remove the fuel filter from the fuel line and direct compressed air through the filter in the opposite direction of the fuel flow. Safety glasses should be worn when using compressed air.
3. AIR AND FUEL LINES. If the air or fuel lines are removed during cleaning, be sure all connections are tight before operating the unit.

STORAGE

• Store the heater in a dry location free from fumes or dust.
• At the end of each heating season, clean the heater as described in the MAINTENANCE section. Drain and flush the fuel tank with clean fuel.
• The manufacturer recommends filling the tank with fuel for extended storage to minimize condensation inside the tank.
• It is recommended to only store kerosene in containers that are marked “KEROSENE”.

SERVICING

• A hazardous condition may result if a heater is used that has been modified or is not functioning properly.

When the heater is working normally:

• The flame is contained within the heater.
• The flame is essentially yellow.
• There is no strong disagreeable odor, eye burning, or other physical discomfort.
• There is no smoke or soot internal or external to the heater.
• There are no unplanned or unexplained shutdowns of the heater.

DIAGNOSTIC SAFETY SHUTDOWN AND TROUBLESHOOTING

• Model MH140KTR, MH185KTR, and MH210KTR heaters are equipped with a diagnostic control board and a flashing LED error indicator.
• These flashing LED signals indicate unit operation status. See the following diagnostic guide for unit status and corrective action if necessary.

required.
Steady OFF| Operation OK| No action is required.
2 Flashes| No flame detected| The heater fails to start during the first 30 sec. of operation.

1.                  Check the wiring to the motor (per wiring schematic in the manual).

2.                  Make sure that the pressure gauge is in place and not damaged.

3.                  Adjust pressure for proper heater operation per manual.

4.                  With the heater disconnected from the AC source, rotate the fan clockwise to verify motor is free.

5.                  Remove the air filter housing from the motor and inspect the pump rotor for damage. If damaged, replace rotor assembly.

6.                  If the wiring is correct, the pump rotor is okay, and the motor is not rotating freely, replace the motor or power-pack assembly.

7.                  If the problem persists, replace the oil flame control assembly.

8.                  Check for spark arching from the electrode assembly (ref.

41) to the combustion cylinder (ref. #39).

9.                  Check the cad cell (ref. #38) for continuity.

3 Flashes| High-limit switch failure| 1.         Make sure the heater is cooled off, press the reset switch, and retry.
4 Flashes| CAD Cell Failure| 1.                  Check the wiring to the cad cell (per the wiring schematic in the manual).

2.                  Clean cad cell photocell.

•    Slide the cad cell out of the cad cell holder.

•    Push the photocell out of the black rubber CAD cell housing by pushing on the 2 purple wires.

•    Clean the photocell with a soft cloth and rubbing alcohol.

•    Pull the photocell back into the cad cell housing and reinstall it into the holder.

•    Test heater.

3.        If the heater still does not operate, replace the CAD cell.

4.        Replace the oil flame control assembly.

Power Light| Power to control| 1.         Sensing power. No action is required.

Model MH50KR and MH80KTR heaters are NOT equipped with a diagnostic control board or flashing LED error indicator. See the following troubleshooting guide for unit status and corrective action if necessary.

switch to “OFF” position, wait 5 minutes and retry.
Sparks, calling for flame, but no or slow motor operation| 1)       Check wiring to motor (per wiring schematic in manual).

2)       Make sure that the pressure gauge is in place and not damaged.

3)       Adjust pressure for proper heater operation per manual.

4)       With heater disconnected from AC source, rotate fan clockwise to verify motor is free.

5)       Remove air filter housing from motor and inspect the pump rotor for damage. If damaged, replace rotor assembly.

6)       If wiring is correct, pump rotor is okay, and motor is not rotating freely, replace motor or power-pack assembly.

7)       If problem persists, replace oil flame control assembly.

8)       Check for spark arching from the electrode assembly, to the combustion cylinder.

9)       Check the cad cell for continuity.

No Spark| 1)       Check length and gage of extension cord for proper amp. draw. (Check requirements on page 4.)

2)       Check wiring to igniter (per wiring schematic in manual).

3)       Check gap between electrode probes (2.3 – 3 mm).

4)       Still no spark, replace igniter assembly.

5)       Replace oil flame control assembly.

Abnormal Motor Operation – Motor overheats or Stops| 1)       Motor speed too low (Motor should operate at 3450rpm) – Replace motor.

2)       With heater disconnected from AC source, rotate fan clockwise to verify motor is free.

3)       Remove air filter housing from motor and inspect the pump rotor for damage. If damaged, replace rotor assembly.

4)       If wiring is correct, pump rotor is okay, and motor is not rotating freely, replace motor or power-pack assembly.

5)       Replace oil flame control assembly.

Unable to Detect Flame| 1)       Check wiring to cad cell (per wiring schematic in manual).

2)       Clean cad cell photo cell.

a)        Slide cad cell out of cad cell holder.

b)        Push the photo cell out of the black rubber cad cell housing by pushing on the 2 purple wires.

c)         Clean the photo cell with a soft cloth and rubbing alcohol.

d)        Pull the photo cell back into the cad cell housing and reinstall into holder.

e)        Test heater.

3)       If the heater still does not operate, replace cad cell.

4)       Replace oil flame control assembly.

Flame Control Failure| 1)       Check wiring in heater (per wiring schematic in manual).

2)       Replace oil flame control assembly.

WIRING DIAGRAM

• The parts lists and wiring diagram show the heater as it was constructed. Do not use a heater that is different from that shown. Heater performance is affected by air pressure setting.
• If there is any uncertainty about the air pressure setting, have it checked?
• A heater which is not working right must be repaired, but only by a trained, experienced service person.

PARTS LIST

Ref.  Item #    Item #    Item #    Item #   Item #     Description| Ref.  Item #    Item #    Item #    Item #   Item #     Description
---|---
M H50KR MH80KTR MH140KTR MH185KTR MH210KTR| MH50KR MH80KTR MH140KTR MH185KTR MH210KTR
1       27145     27145     27145     27145     27145      Power Cord

2       26958     28701     28702     28703     28703      Fuel Tank Assembly

3       ****        21883     21884     21885     21886      RadiationShield Ass’y

4       26960     26967     26975     26975     26975      Power Pac Ass’y

5       21686     24343     24346     24346     24346      Fuel Tube

6       21835     21836     21837     21837     21837      Grille Assembly

7       24011     24011     24011     24011     24011      Oil cad cell Bracket

8       28779     28779     28792     28793     28793      Fuel Filter

9       23449     23449     23449     23449     23449      Motor Cord Sleeve

10     26957     27144     26973     27111     27111      Bottom Shell

11     21844     27143     26972     27110     27110      Top Shell, Burner

12     21854     26966     26971     27109     27109      Top Shell, Insp. Cover

13     21864     21864     21865     21865     21865      Motor Mounting Brkt

14     ****        28788     28735     28735     28735      Start Capacitor

15     23725     23725     24345     24345     24345      Air Tube

16     26225     26225     26225     26225     26225      Snap Bushing

17     26962     21794     26901     22105     22105      High Limit Control

18     F226831 F226831 F226831 F226831 F226831 Kit, Rotor

– Air Pump Rotor w/Vanes

– Nylon Air Pump Insert

19     27925     27925                     ****         Handle

20     21813     21813     21813     21813     21813      Gasket, Outlet Filter

21     26833     26833     26833     26833     26833      Air Pump Cylinder

22     21810     21810     21810     21810     21810      Outlet Housing

23     21812     21812     21812     21812     21812      Inlet Housing

24                     22209     22210     22210      Burner Head Ass’y

25     F221887 F221887 F221887 F221887 F221887 Kit, Filter

26     21814     21814     21814     21814     21814      Outlet Filter

27     21815     21815     21815     21815     21815      Inlet Filter

28     F266842 F266842 F266842 F266842 F266842 Kit, Pump Adjustment

– Nylon Pipe Plug

– Pump Adj. Screw Cap

– Ball,. Pressure adj.

– Spring, Pressure adj.

| 29     21866     21866     21867     21867     21867      Flame Control Ass’y

30     21816     21816     21816     21816     21816      Flame Control Bracket

31     F226865  F226865  F226865  F226865  F226865   cad cell Flame Sensor

32     21882     21868     21869     21870     21871      Comb.Chamber Cyl.Ass’y

33     26959     26959     26959     26959     26959      Fuel Cap

34     26910     26910     26910     26910     26910      Fuel Cap Gasket

35     27339     21817     21818     21818     21818      Motor

36     27790     27790     22208     22208     22208      Nozzle Adapter

37     27421     28740     22211     26866     26866      Fan

38     22142     22142     22142     22142     22142      Igniter Assembly

39     F227416  F221880  F221881  F221882  F221891   Fuel Air Aspir. Nozzle

40     26223     26223     26223     26223     26223      Strain Relief Bushing

41     F221857  F221857  F221857  F221857  F221857   Electrode Assembly

42     21820     21820     21820     21820     21820      Electrode Insulated Cover

43     21821     21821     21821     21821     21821      Hose Barb Adapter

44     ****        21822     21822     21822     21822      Thermostat Knob

45     ****        21734     21734     21734     21734      Thermostat Assembly

46     28785     28785     28785     28785     28785      ON/OFF Switch

47     ****        28790     28794     28795     28795      Fuel Gauge

48     26964     21888     27107     27116     27116      Control Panel

49     26965     26968     27108     27117     27117      Control Panel Back

50     28786     28786     28786     28786     28786      Pressure Gauge, Round

*       24171     24171                     ****         Nozzle mtg. plate

*                                 26227     26227     26227      Snap Bushing

*       27429     27429     27429     27429     27429      Nozzle Ext. Retaining Ring

*       28745     28745                     ****         Fuel Line Bushing

*       ****        22146     22146     22146     22146      Bracket Thermostat Mtg.

*       ****        26070     26070     26070     26070      Clamp Loop

*       Not shown in the drawing

PARTS LIST

Ref.| Item #| Item #| Item #| Description
MH140KTR| MH185KTR MH210KTR
1             22192| 22192| 22192| Wheel Assembly
2             22193| 22193| 22193| Upper Handle w/Spring Clips
3             22194| 22194| 22194| Lower Handle, Right
             22195| 22195| 22195| Lower Handle, Left
4             22196| 22196| 22196| Leg Support, Right
             22196| 22196| 22196| Leg Support, Left
5             22197| 22197| 22197| Support Leg
6             22198| 22198| 22198| Front Handle
7             22199| 22199| 22199| Large Retainer Washer
8             22200

9             22206

| 22200

22206

| 22200

22206

| Cotter Pin

Axel

10           22207| 22207| 22207| Wheel Spacer
*             28787| 28787| 28787| Hardware Package

Not shown in the drawing

• www.mrheater.com
• 800-251-0001

Documents / Resources

| MR HEATER MH50KR Kerosene Forced Air Heater [pdf] Owner's Manual
MH50KR Kerosene Forced Air Heater, MH50KR, Kerosene Forced Air Heater, Forced Air Heater, Air Heater
---|---

References

• Mr. Heater®: Keep Warm. Stay Comfortable.
• 21794 High Limit Control Switch
• 22105 Hi Limit Switch Assy 210KT Series 2006 and Newer
• 26866 FAN 5 BLADE FIT 175K-210K ENERCO PORTABLE HEATERS
• 26959 Replacement Fuel Cap Part for Mr. Heater Fuel Tank Lid
• 28779 Kerosene Fuel Filter with Screen 50K - 75K BTU Heaters
• 28792 Fuel Filter Part Replacement for MH125 Kerosene Heater
• 28793 Fuel Filter pickup Assembly - Pre 2009
• F221857 Electrode Spark Plug Assembly for Kerosene Heaters
• 27421 Fan Replacement for DeWalt Forced Air Heater DXH50X
• 28740 Fan Replacement Part for Forced Air Kerosene Heaters
• Hi Limit switch
• HI LIMIT SWITCH, MH50KR
• 21812 Housing Inlet for 50K, 75K, 135K, and 185K Heaters
• Round Outlet Housing for DeWalt, Mr. Heater, HeatStar
• 22142 Ignitor Assembly Model ST-12E for Kerosene Heaters
• KNOB,THERMOSTAT,MH75-210K,2009,&,NEWER
• 28785 ON/OFF,SWITCH,MH75-210KT
• F266842 Pump Adjustment Kit for Kerosene Forced Air Heaters
• 26833 Pump Ring for 50K-210K BTU Portable Kerosene Heaters
• 21734 Thermostat for 75K- 210K Forced Air Kerosene Heaters

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