Portable Big Buddy Radiant Heater MH18B

PORTABLE PROPANE HEATER FOR RECREATIONAL AND COMMERCIAL USE

FOR CANADA & MASSACHUSETTS SALE

Use only Mr. Heater branded accessories (See page 10 for WARNING information)

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.

WARNINGS

• Early signs of carbon monoxide poisoning resemble the flu, with headache, dizziness and/ or nausea. If you have these signs, heater may not be working properly. Get fresh air at once! Have heater serviced.
• Every time hose or tank is connected to unit, connection must be checked for leaks in one or more ways: Apply soapy water to connection, look for bubbles, listen for hiss of escaping gas, feel for extreme cold, smell for rotten egg odor. Do not use if leaking!
• Any changes to this heater or its controls can be dangerous.

Caution:

• When operating the heater at altitudes over 7,000 FT above sea level the heater may shut off. (Please read the GENERAL INFORMATION)
• Some carpets or linoleum surfaces may discolor if heater is placed directly on these floor coverings.

GENERAL SAFETY INSTRUCTIONS

THIS IS A HEATING APPLIANCE. DO NOT OPERATE THIS APPLIANCE WITHOUT THE FRONT GRILL INSTALLED. DO NOT ATTEMPT TO WARM OR COOK FOOD ON THIS HEATER.

• Do not use non-approved attachments on this heater.
• Due to high temperatures, the appliance should be located out of traffic and away from combustible materials.
• Children and adults should be alerted to the hazard of high surface temperatures and should stay away to avoid burns or clothing ignition.
• Young children should be carefully supervised when they are near the appliance.

WARNINGS

Fuels used in liquefied propane gas appliances, and the products of combustion of such fuel, can expose you to chemicals including benzene, which is known to the state of California to cause cancer and cause birth defects or other reproductive harm, for more information go to www.P65Warnings.ca.gov

WARNINGS

This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov

WARNINGS

Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.

• Clothing or other flammable materials should not be hung from the heater, or placed on or near the heater.
• Do not operate heater in any moving vehicle.
• This heater requires a vent area of 18 square inches (example 4.25” x 4.25” opening) minimum for adequate ventilation during operation. Do not use other fuel burning appliances inside.
• GAS PRESSURE AT HEATER IS REGULATED AND FIXED AT 11” W.C. WHEN USING A REMOTE HOSE CONNECTION DO NOT REGULATE OR REDUCE PROPANE TANK SUPPLY PRESSURE TO HEATER!
• REGULATOR IN HEATER MUST ALWAYS BE IN PLACE DURING OPERATION.

Specifications

WARNINGS

ANY HOSE CONNECTION TO A QUICK DISCONNECT FITTING ON HEATER MUST BE REGULATED TO 11” W.C. PRESSURE.

• If the wire guard is removed for servicing, it must be replaced prior to operating the heater.
• The appliance should be inspected before each use. Frequent cleaning may be required. The control compartments, burner and circulating air passageways of the appliance must be kept clean, see MAINTENANCE.
• Keep ventilation openings of the cylinder enclosure free and clear from debris.
• DO NOT use this heater if any part has been under water. Immediately call a qualified service technician to inspect the heater and to replace any part of the control system and any gas control, which has been under water.

ODOR FADE WARNING

WARNINGS

ASPHYXIATION HAZARD

• Do not use in unventilated areas.
• The flow of combustion and ventilation air must not be obstructed.
• Proper ventilation air must be provided to support the combustion air requirements of the heater being used.
• Refer to the specification section of the heater’s manual, heater dataplate, or contact the factory to determine combustion air ventilation requirements of the heater.
• Lack of proper ventilation air will lead to improper combustion.
• Improper combustion can lead to carbon monoxide poisoning leading to serious injury or death. Symptoms of carbon monoxide poisoning can include headaches, dizziness and difficulty in breathing.
• When used without adequate combustion and ventilation air, this heater may give off excessive CARBON MONOXIDE, an odorless, poisonous gas.
• Some people – pregnant women, persons with heart or lung disease, anemia, those under the influence of alcohol, those at high altitudes – are more affected by carbon monoxide than others.
• When heater is placed on the ground, make sure the ground is level and keep any objects at least 24 inches from the front of the heater. THIS HEATER IS EQUIPPED WITH A TIP OVER SWITCH THAT WILL SHUT THE HEATER OFF IF THE HEATER TIPS OVER HOWEVER, DO NOT LEAVE HEATER UNATTENDED OR WHERE CHILDREN MAY CAUSE THE HEATER TO TIP OVER. NEVER OPERATE THE HEATER WHILE SLEEPING!

FUEL GAS ODOR
Propane (LP) gas and natural gas have man‑made odorants added specifically for detection of fuel gas leaks.
If a gas leak occurs you should be able to smell the fuel gas. Since propane (LP) gas is heavier than air you should smell for the gas odor low to the floor. ANY GAS ODOR IS YOUR SIGNAL TO GO INTO IMMEDIATE ACTION!

• Do not take any action that could ignite the fuel gas. Do not operate any electrical switches. Do not pull any power supply or extension cords. Do not light matches or any other source of flame. Do not use your telephone.
• Get everyone out of the building and away from the area immediately.
• Close all propane (LP) gas tank or cylinder fuel supply valves, or the main fuel supply valve located at the meter if you use natural gas.
• Propane (LP) gas is heavier than air and may settle in low areas. When you have reason to suspect a propane (LP) gas leak, keep out of all low areas.
• Use your neighbor’s phone and call your fuel gas supplier and your fire department. Do not re‑enter the building or area.
• Stay out of the building and away from the area until declared safe by the firefighters and your fuel gas supplier.
• FINALLY, let the fuel gas service person and the firefighters check for escaped gas. Have them air out the building and area before you return. Properly trained service people must repair any leaks, check for further leakages, and then relight the appliance for you.

SAFETY INSTRUCTIONS

ODOR FADING ‑ NO ODOR DETECTED

• Some people cannot smell well. Some people cannot smell the odor of the man‑made chemical added to propane (LP) gas. You must determine if you can smell the odorant in these fuel gases.
• Learn to recognize the odor of propane (LP) gas. Local propane (LP) gas dealers will be more than happy to give you a scratch and sniff pamphlet. Use it to become familiar with the fuel gas odor.
• Smoking can decrease your ability to smell. Being around an odor for a period of time can affect your sensitivity to that particular odor. Odors present in animal confinement buildings can mask fuel gas odor.
• The odorant in propane (LP) gas is colorless and the intensity of its odor can fade under some circumstances.
• If there is an underground leak, the movement of gas through the soil can filter the odorant.
• Propane (LP) gas odor may differ in intensity at different levels. Since propane (LP) gas is heavier than air, there may be more odor at lower levels.
• Always be sensitive to the slightest gas odor. If you continue to detect any gas odor, no matter how small, treat it as a serious leak. Immediately go into action as discussed previously

ATTENTION ‑ CRITICAL POINTS TO REMEMBER!

• Propane (LP) gas has a distinctive odor. Learn to recognize these odors. (Reference Fuel Gas Odor and Odor Fading sections above.
• Even If you are not property trained in the service and repair of the heater, ALWAYS be consciously aware of the odors of propane (LP) gas.
• If you have not been properly trained in repair and service of propane (LP) gas then do not attempt to light heater, perform service or repairs, or make any adjustments to the heater on the propane (LP) gas fuel system.
• A periodic sniff test around the heater or at the heater’s joints; i.e. hose, connections, etc., is a good safety practice under any conditions. If you smell even a small amount of gas, CONTACT YOUR FUEL GAS SUPPLIER IMMEDIATELY. DO NOT WAIT!

GENERAL INFORMATION

• When the heater is cold or at room temperature, it will take a few minutes for the burner tile to turn bright orange. This is normal and the heater is working properly. If burner tile is visibly flaming, turn heater off and call a qualified service technician.
• When the unit is lit, there should be about a quarter inch (1/4”) border around the tile that will not turn bright orange. This is normal.

OPERATION

• When operating the heater at altitudes over 7,000 FT. above sea level, the unit may not burn as bright as in lower altitudes. This is normal. At higher altitudes, the heater may shut-off. If this happens, provide fresh air, wait 5 minutes and re-light. Due to local atmospheric conditions heater may not relight.
• Operating time will vary based on the temperature of the surroundings and if running the heater on low, medium, or high setting. Rough guidelines are as follows: Single 1lb cylinder (1.5 to 6hrs); 2 x 1lb cylinders (3 to 12 hrs); 20lb cylinder (24 to 108hrs); 2 x 20lb cylinders (48 to 216hrs). Heater may be operated from quick disconnect, one or both regulated inlets. Due to the properties of LP gas, runtimes can be significantly reduced when operating continuously at temperatures below 20ºF. Use of a 20 lb. tank is recommended in these conditions.
• When moving heater when lit or bumping heater setting it down, the tip over switch may shut off heater. If this happens, re-light.

NOTE: THIS HEATER MAY BE OPERATED WITH (1) OR (2) DISPOSABLE 1 LB. PROPANE CYLINDERS OR WITH A REMOTE REFILLABLE CYLINDER(S) MAX. 20 LBS USING (1) OR (2) F273701, F273702 OR F272702 HOSE ASSEMBLIES WITH FUEL FILTERS (F273699) (Figure 3) ON EACH HOSE ASSEMBLY. HOSE NO. F273704 BUDDY SERIES HOSE, FUEL FILTER NOT REQUIRED. IT MAY ALSO BE OPERATED WITH (1) F271802 HOSE ASSEMBLY CONNECTED TO A REGULATED (11” W.C.) PROPANE SOURCE “FILTER NOT REQUIRED” OR (1) F271803 HOSE ASSEMBLY WITH 11” REGULATOR WITH ACME NUT “FILTER NOT REQUIRED”.

LIGHTING / OPERATING INSTRUCTIONS FOR USE WITH DISPOSABLE 1 LB. PROPANE CYLINDERS:
ALWAYS ATTACH OR DETACH CYLINDER OUTDOORS AWAY FROM FLAMES, OTHER IGNITION SOURCES, AND ONLY WHEN HEATER IS COOL TO TOUCH. NEVER SMOKE WHEN  ATTACHING OR REMOVING PROPANE CYLINDER OR MAKING REMOTE CONNECTIONS!

• LP cylinders must be marked in accordance with “Cylinders, Spheres and Tubes for Transporation of Dangerous Goods, CAN/CSA B339”.
• Use only 16.4 oz. (1 lb.) disposable cylinders that mate with No. 600 valve connection.
• Heater and attached cylinder must be in an upright position during operation.

1. Make sure four-position Control Knob is in “OFF” position. See Figure 1.
2. Screw 1 lb. disposable LP-gas supply cylinder clockwise (from bottom) into portable heater until hand-tight. See Figure 2. Do not use thread sealant on this connection.
3. Check cylinder connection for leaks with soapy water at the threaded connection under the domed plastic cover where the cylinder screws into the regulator. SEE WARNING! ON DOMED PLASTIC COVER.
4. Depress and turn Control Knob counterclockwise to “PILOT” position. See Figure 4. Hold Control Knob down in the pilot position for 30-40 seconds.
5. While holding down the Control Knob, rotate clockwise to the OFF position and immediately turn back to the pilot position, a spark will be generated at the pilot assembly and the heater should light. If the heater does not light on the first attempt, repeat the procedure.
6. Once the pilot has lit, hold the Control Knob down for an additional 30 seconds to heat the thermocouple. After 30 seconds, release the Control Knob and the pilot should remain lit.
7. If the pilot goes out repeat the lighting procedure.
8. After lighting pilot, release knob. Knob should return to fully extended position. See Figure5.
9. Turn control knob to “LO” or “MD” position to light heater. Leave on “LO” or “MD” position until the left burner tile has turned bright orange.
10. After left burner tile has turned bright orange, adjust heat output by turning Control Knob to desired position (“LO”, “MD” or “HI”). Note: Both tiles turn orange only on HI setting. (2) 1 LB. propane bottles are needed to use heater in (HI) position

WARNINGS

Always inspect propane cylinder and heater propane connections for damage, dirt, and debris before attaching propane cylinder. Do not use if head of cylinder is damaged, punctured or deteriorated.

WARNINGS

Do not operate heater unless control knob is locked in a position marked “hi”, “md”, “lo” or “pilot”. Never set control knob between locked positions. Poor combustion and higher levels of carbon monoxide may result.

CAUTION:

Do not try to adjust heating levles by using the propane tank shut off valve.

11. For added heat circulation turn red fan switch to on. The fan switch is located just left of control knob side handle support. See Figure 1.
12. Installation of 4 D-cell batteries is required for fan operation. Battery box is located on lower back panel of heater. Follow instructions on battery cover for correct battery installation. See Figure 6.
13. Heater fan can also be powered by electrical adapter F276127. Required adapter to be 6 volt DC up to 800 milliamp current with positive tip polarity. See Figure 6.

Shutdown Instructions

• To shut off heater, slightly push down and turn Control Knob clockwise to “OFF” position.
• Do not operate, store or remove cylinder near flammable items or ignition sources.

LP-GAS CYLINDERS MUST BE DISCONNECTED FROM HEATER WHEN NOT IN USE!

LIGHTING / OPERATING INSTRUCTIONS FOR USE WITH HOSE CONNECTED TO A REMOTE CYLINDER, MAXIMUM SIZE 20 LBS:

• This heater may be operated with Mr. Heater Hose No. F271802 which includes a quick disconnect fitting and a 3/8” female flare fitting connected to a regulated (11” W.C.) propane source or Mr. Heater Hose No. F271803 which includes a quick disconnect fitting and a 11” W.C. regulator.
• Inspect the hose before each use of the heater. If there is excessive abrasion or wear, or the hose is cut, replace prior to using the heater with one of the Mr. Heater Hose No’s. shown above.
• The propane cylinder must include a listed overfilling protection device as well as a collar to protect the cylinder valve.
• The propane cylider must also be used with Tankfoot F273169. Place holder on flat surface then place 20 lb. cylinder in holder and push down to bottom.
• Heater must be in an upright position during operation.

WARNINGS

ANY HOSE CONNECTION TO A QUICK DISCONNECT FITTING ON HEATER MUST BE REGULATED TO 11” W.C. PRESSURE.

CAUTION:

After turning heater off, wire guard will remain hot. Allow to thoroughly cool before storing.

DANGER:

NEVER bring a refillable propane cylinder indoors. A fire or explosion can occur causing property damage, serious injury or death!

1. Make sure five-position Control Knob is in “OFF” position. See Figure 1.
2. Mr. Heater strongly recommends using disposable fuel filter F273699 to trap any oil substances when connected to a remote cylinder that can make heater inoperable.
3. Screw hose connector into tank swivel or fuel filter on heater or connect to quick disconnect and screw connector on other end of hose into LP gas tank valve. Tighten all hose connections. DO NOT use thread sealant on any of these connections.
4. Open valve at LP-gas supply cylinder.
5. Check all hose connections for leaks with soapy water at the threaded connection under the domed plastic cover where the hose connector screws into the regulator and at LP-gas supply cylinder. SEE WARNING! ON PLASTIC DOORS.
6. Depress and turn Control Knob counterclockwise to “PILOT” position and hold down for 1 – 5 seconds. See Figure 4. This may take longer to purge air from the supply hose depending on the length of the hose being used.
7. While holding down the control knob, rotate clockwise to the OFF position and immediately turn back to the pilot position, a spark will be generated at the pilot assembly and the heater should light. If the heater does not light on the first attempt, repeat the procedure.
8. Once the pilot has lit, hold the control knob down for an additional 30 seconds to heat the thermocouple. After 30 seconds, release the control knob and the pilot should remain lit. If the pilot goes out repeat the lighting procedure.
9. After lighting pilot, release knob. Knob should return to fully extended position. See Figure 5.
10. Turn control knob to “LO” or “MD” position to light heater. Leave on “LO” or “MD” position until first burner tile has turned bright orange.
11. After first burner tile has turned bright orange, adjust heat output by turning Control Knob to desired position (“LO”, “MD” or “HI” setting).
12. For added heat circulation turn red fan switch to on. The fan switch is located just left of control knob side handle support. See Figure 1.
13. Installation of 4 D-cell batteries is required for fan operation. Battery box is located on lower back panel of heater. Follow instructions on battery cover for correct battery installation. See Figure 6.
14. Heater fan can also be powered by electrical adapter F276127. Required adapter to be 6 volt DC up to 800 milliamp current with positive tip polarity. See Figure 6.

Shutdown Instructions

• To shut off heater, shut off propane at supply tank, allow heater to use-up propane in supply line until heater shuts off, then slightly push down and turn Control Knob clockwise to “OFF” position.
• When not in use, the gas must be turned off at the LP-gas supply cylinder. As stated before allow heater to use up propane in supply line until heater shuts off. When the LP-gas supply cylinder is not disconnected from the heater, the heater and the cylinder must be stored outdoors, in a well ventilated space, out of reach of children, and must not be stored in a building, garage or any other enclosed area.
• Indoor storage of the heater is permissible only if the cylinder is disconnected and removed from the heater. Cylinders must be stored outdoors out of the reach of children and must not be stored in a building, garage or any other enclosed area.

MAINTENANCE

WARNINGS

Never use needles, wires or similar cylindrical objects to clean the pilot to avoid damaging the calibrated ruby that controls the gas flow through the pilot orifice.

• Always keep the heater area clear and free from combustible materials, gasoline and other flammable vapors and liquids.
• Keep the vent areas (slots in the bottom and top of the heater) clear at all times.
• Visually inspect the pilot flame and burner periodically during use. The pilot flame should be blue in color (not yellow) and will extend to the thermocouple. The flame will surround the thermocouple just below the tip. See Figure 7.
• A slight yellow flame may occur where the pilot flame and main burner flame meet. The burner should be bright orange (with a slight blue color around the border, a red-orange haze that is visible on the ceramic tile is acceptable) and without a noticeable flame.
• A blue flame that rolls out at the top of the ceramic tile indicates an accumulation of dust, lint or spider webs inside the housing assembly and main burner assembly. If the pilot is yellow or the burner has a noticeable flame, cleaning may be required.
• It is necessary to periodically check the burner orifice and burner venturi to make sure that they are clear of things such as insect nests and spider webs that may accumulate over time. A clogged tube can lead to a fire.
• Use the following procedure to inspect the casing assembly and main burner assembly.

Cleaning Instructions (Refer to Exploded Parts on Page 8):
IMPORTANT: Allow heater to thoroughly cool before performing any maintenance.

1. Remove disposable 1 lb. cylinder from heater or turn OFF gas supply at remote cylinder valve, and disconnect hose from heater.
2. Remove wire guard from front of heater by gently bending to remove from holes in front cover.
3. Remove (4) four screws that secure the rear cover (ref. # 3) to the heater.
4. Pivot cover outward from bottom. Release from 2 top clips. Set aside.
5. Remove (3) screws attaching lower baffle to expose burner air openings.
6. Inspect interior of casing assembly for accumulation of dust, lint or spider webs. If necessary, clean interior casing assembly with a vacuum cleaner or apply air pressure (max. 30 psi). Do not damage any components within casing assembly when you are cleaning.
7. Inspect and clean main burner orifice located at bottom of burner venturi tube,Using vacuum or apply air pressure at orifice opening.
8. Inspect and clean pilot (mounted to bracket) by using a vacuum or apply air pressure through the holes in the pilot indicated by the arrows in Figure 7.
9. Apply air pressure (max. 30 psi) into ceramic tile of burner assembly and the venturi tube (with 2 air openings) to remove dust, lint or spider webs.
10. Reinstall lower baffle with (3) screws.
11. Slide back cover over (2) plastic hooks on top of heater. Make sure rear cover aligns with plastic side covers and reinstall (4) screws to hold in place.
12. Replace wire guard.

TROUBLESHOOTING

PARTS LIST

ACCESSORIES:

WARRANTY AND PARTS ORDERING

WARNINGS

USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE AGENCY. MR. HEATER HOSES F273701, F273702 AND F272702 ARE SPECIFICALLY DESIGNED FOR USE WITH THIS HEATER ALONG WITH F273699 DISPOSABLE FUEL FILTER (REPLACE ANNUALLY). USE OF OTHER HOSES MAY CAUSE THE HEATER TO BECOME INOPERABLE. USE BUDDY SERIES HOSE NO. F273704, FUEL FILTER IS NOT REQUIRED.

WARNINGS

THIS PRODUCT IS A HEATER. IT IS CERTIFIED AS A HEATER AND IS NEVER TO BE USED FOR THE COOKING OR WARMING OF FOODS AS DOING SO CAN INTERFERE WITH THE SAFETY SYSTEMS OF THE HEATER, WHICH MAY RESULT IN A FIRE, EXPLOSION, THE PRODUCTION OF DEADLY CARBON MONOXIDE, AND PERSONAL INJURY OR DEATH TO YOU OR OTHERS. NEVER USE HAND-MADE OR THIRD PARTY ACCESSORIES OR ATTACHMENTS WITH THIS HEATER; THIS IS EXTREMELY DANGEROUS AND MAY RESULT IN PERSONAL INJURY OR DEATH TO YOU OR OTHERS.

PARTS ORDERING INFORMATION
PURCHASING: Accessories may be purchased at any Mr. Heater local dealer or direct from the factory

FOR INFORMATION REGARDING SERVICE
Please call Toll-Free 800-251-0001
Or visit www.mrheater.com
Our office hours are 8:00 AM – 5:00 PM, EST, Monday through Friday.
Please include the model number, date of purchase, and description of problem in all communication.

LIMITED WARRANTY
Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in material and workmanship for a period of 1 year from date of purchase. Mr. Heater, Inc. will repair or replace this product free of charge if it has been proven to be defective within the 1-year period, and is returned at customer expense with proof of purchase to Mr. Heater, Inc. within the warranty
period. DISCLAIMER: This warranty does not cover any product that: a) has been subject to misuse or neglect; b) has been used in a manner inconsistent with the warnings and instructions contained in the owner’s manual, including but not limited to using a heater for the cooking or warming of foods; or c) has been used with hand-made or third party accessories or attachments.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.

Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obligation, in colors, specifications, accessories, materials and models.

PRODUCT REGISTRATION: Thank you for your purchase.
Please log in to http://www.egiregistration.com to register your product.

MR. HEATER, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 800-251-0001
Mr. Heater and Portable Buddy are registered trademarks of Enerco Group, Inc.
© 2020, Enerco/Mr. Heater. All rights reserved

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.

GAS-FIRED INFRA-RED
TANK TOP HEATER
CYLINDER NOT INCLUDED

­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.
— An LP cylinder not connected for use shall not be stored in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS

• Do not try to light the appliance.
• Extinguish any open flame.|
• Shut off gas to the appliance

— DO NOT LEAVE THE HEATER UNATTENDED OR IN OPERATION WHILE SLEEPING.
This is an unvented gas-fired portable heater. It uses air (oxygen) from the area in which it is used. Adequate combustion and ventilation air must be provided. Refer to page 2.
www.mrheater.com
800-251-0001

WARNING: YOUR­SAFETY­IS­IMPORTANT­TO­YOU­ AND­TO­OTHERS,­SO­PLEASE­READ­THESE­INSTRUCTIONS­ BEFORE­YOU­OPERATE­THIS­HEATER.

GENERAL HAZARD WARNING: FAILURE­TO­ COMPLY­WITH­THE­PRECAUTIONS­AND­INSTRUCTIONS­ PROVIDED­WITH­THIS­HEATER,­CAN­RESULT­IN­ DEATH,­ SERIOUS­BODILY­INJURY­AND­PROPERTY­LOSS­OR­ DAMAGE­FROM­HAZARDS­OF­FIRE,­EXPLOSION,­BURN,­ ASPHYXIATION,­CARBON­ MONOXIDE­POISONING,­AND/ OR­ELECTRICAL­SHOCK.­ONLY­PERSONS­WHO­CAN­ UNDERSTAND­AND­FOLLOW­THE­INSTRUCTIONS­SHOULDUSE­OR­ SERVICE­THIS­HEATER.­IF­YOU­NEED­ASSISTANCE­ OR­HEATER­INFORMATION­SUCH­AS­AN­INSTRUCTIONS­ MANUAL,­LABELS,­ETC.­CONTACT­THE­ MANUFACTURER.­ SO­PLEASE­READ­THESE­INSTRUCTIONS­BEFORE­YOU­ OPERATE­THIS­HEATER.

WARNING: FUELS­USED­IN­LIQUEFIED­PROPANE­GAAPPLIANCES,­AND­THE­PRODUCTS­OF­COMBUSTION­ OF­SUCH­FUEL,­CAN­EXPOSE­YOU­TO­ CHEMICALS­ INCLUDING­BENZENE,­WHICH­IS­KNOWN­TO­THE­STATEOF­CALIFORNIA­TO­CAUSE­CANCER­AND­CAUSE­BIRTH­ DEFECTS­OR­OTHER­ REPRODUCTIVE­HARM,­FOR­MORE­ INFORMATION­GO­TO ­­WWW.P65WARNINGS.CA.GOV.

WARNING: NOT­FOR­HOME­OR­RECREATIONAL­ VEHICLE­USE.
WARNING: FIRE,­BURN,­INHALATION,­AND­ EXPLOSION­HAZARD.­KEEP­SOLID­COMBUSTIBLES,­SUCHAS­BUILDING­MATERIALS,­PAPER­OR­CARDBOARD,­  A­SAFE­DISTANCE­AWAY­FROM­THE­HEATER­AS­ RECOMMENDED­BY­THE­INSTRUCTIONS.­NEVER­USE­ THE­HEATER­IN­SPACES­WHICH­DO­OR­MAY­ CONTAIN­ VOLATILE­OR­AIRBORNE­COMBUSTIBLES,­OR­PRODUCTSSUCH­AS­GASOLINE,­SOLVENTS,­PAINT­THINNER,­DUST­ PARTICLES­OR­UNKNOWN­ CHEMICALS.

WARNING: THIS­PRODUCT­CAN­EXPOSE­YOU­TO­ CHEMICALS­INCLUDING­LEAD­AND­LEAD­COMPOUNDS,­ WHICH­ARE­KNOWN­TO­THE­STATE­OF­ CALIFORNIA­ TO­CAUSE­CANCER­AND­BIRTH­DEFECTS­OR­OTHER­ REPRODUCTIVE­HARM.­FOR­MORE­INFORMATION­VISIT­ WWW.P65WARNINGS.CA.GOV.
WARNING: CARBON­MONOXIDE­CAN­KILL­YOU­ USING­A­PORTABLE­GAS­CAMPING­HEATER­INSIDE­ A­TENT,­RV,­CAMPER,­VEHICLE,­SHELTER,­OR­OTHER­  ENCLOSED­AREAS­CAN­PRODUCE­DEADLY­CARBON­ MONOXIDE.

The heater is designed and approved for use as, a construction heater and in accordance with ANSI Z83.7-CSA 2.14. Check with your local fire safety authority if you have any questions about applications.
Other standards govern the use of fuel gases and heat-producing products and specific applications. Your local authority can advise you about these standards.

ASSEMBLY AND HOOK-UP INFORMATION

1. Heater model MHS15T and MHS3OT are packaged com­ Propane cylinders (tanks) are not included with the heater model.
2. Remove heater from the carton.
3. Use only vapor withdrawal LP gas cylinders constructed for use with propane only (HD-5) and marked in accor­dance with the specifications for LP gas cylinders of the S. Department of Transportation (DOT SPEC. 39).
4. This heater must be used only with a vapor withdrawal LP gas bulk tank equipped with a standard POL valve
   do not use this heater on bulk tanks greater than 20 pounds LPG capacity (50 pounds water capacity).5a. MHS307 Dual Burner Model (see Figure 1.)
   • Assembly of the MHS3OT requires a Philips screw­driver.
   • The tank collar bracket must be assembled before the heater can be attached to the propane tank.
   • Remove screws from manifold center plate and retain for later use.
   • Align bolt holes in the tank collar bracket with bolt holes in the center plate on a manifold such that the heater is facing outward once attached to the cylinder collar.
   • Attach with screws removed above, making sure that tip switch bracket is between tank collar bracket and manifold center plate.
   • Place heater onto tank with tank collar bracket over tank collar. The mounting bolt knob should be posi­tioned to the outside of tank collar.
   • Firmly secure to tank by hand-tightening mounting bolt knob. Do not overtighten.
   • Make sure the heater regulator is in the “OFF” position.
   • Insert regulator’s connector into tank’s valve and turn left (counterclockwise) with a hand as much as Do not overtighten.

   5b. MHS1ST Single Burner Model (See Figure 2.)

   • Be sure the heater is facing away from the tank.
   • Insert regulator connector into tank valve outlet fitting and turn left (counterclockwise) until fully Do not overtighten. (See Figure 2a)
   • Place heater support around venturi and slide clip ends onto propane cylinder collar. Use 1/4″-20 x

   

   35mm screw and wing nut to secure heater sup­port onto venturi tube. (See Figure 2b)

   6. Operate only on a stable, level surface.
   7. Open propane tank valve slowly.
   8. Check all fittings for Apply a 50/50 mixture of liquid soap and water to all joints. Bubbles forming indicate a leaking connection. Correct all leaks before proceeding.

   WARNING

   Never touch the heater while in operation to avoid injury. Move heater by grasping the propane cylinder carefully.

   6. The heater should be inspected before each use and at least annually by a qualified service person.
   7. The hose assembly shall be visually inspected prior to use of If it is evident there is excessive abrasion or wear, or the hose is cut, it must be replaced prior to the heater being put into operation. Replacement hose assembly shall be Mr. Heater hose assembly as listed in the parts list.
   8. Minimum inlet gas pressure is 20
   9. Maximum inlet gas pressure is 120 psi (equivalent to an ambient temperature of 75’F (24°C)).

ODOR FADE WARNING

WARNING

Asphyxiation Hazard

• Do not use this heater for heating human living
• Do not use in unventilated areas.
• The flow of combustion and ventilation air must not be obstructed.
• Proper ventilation air must be provided to support the combustion air requirements of the heater being used.
• Refer to the specification section of the heater’s manual, heater data plate, or contact the factory to determine the combustion air ventilation requirements of the heater.
• Lack of proper ventilation air will lead to improper combustion.
• improper combustion can lead to carbon monoxide poisoning leading to serious injury or death. Symptom of carbon monoxide poisoning can include headaches, dizziness, and difficulty in breathing.

FUEL GAS ODOR

LP gas and natural gas have man-made odorants added specifically for the detection of fuel gas leaks.
If a gas leak occurs you should be able to smell the fuel gas. Since Propane (LP) is heavier than air you should smell for the gas odor low to the floor. ANY GAS ODOR IS YOUR SIGNAL TO GO INTO IMMEDIATE ACTION!

• Do not take any action that could ignite the fuel gas. Do not operate any electrical switches. Do not pull any power supply or extension Do not light matches or any other source of flame. Do not use your telephone.
• Get everyone out of the building and away from the area
• Close all propane (LP) gas tank or cylinder fuel supply valves, or the main fuel supply valve located at the meter if you use natural gas.
• Propane (LP) gas is heavier than air and may settle in low When you have reason to suspect a propane leak, keep out of all low areas.
• Use your neighbor’s phone and call your fuel gas supplier and your fire department. Do not reenter the building or
• Stay out of the building and away from the area until declared safe by the firefighters and your fuel gas
• FINALLY, let the fuel gas service person and the firefighters check for escaped gas. Have them air out the building and area before you return. Properly trained service people must repair any leaks, check for further leakages, and then relight the appliance for you.

ODOR FADING – NO ODOR DETECTED

• Some people cannot smell well. Some people cannot smell the odor of the manmade chemical added to propane (LP) or natural gas. You must determine if you can smell the odorant in these fuel gases.
• Learn to recognize the odor of propane (LP) gas and natural gas. Local propane (LP) gas dealers will be more than happy to give you a scratch and sniff pamphlet. Use it to become familiar with the fuel gas odor.

• Smoking can decrease your ability to smell. Being around an odor for a period of time can affect your sensitivity to that particular odor. Odors present in animal confinement buildings can mask fuel gas odor.
• The odorant in propane (LP) gas and natural gas is colorless and the intensity of its odor can fade under some circumstances.
• If there is an underground leak, the movement of gas through the soil can filter the odorant.
• Propane (LP) gas odor may differ in intensity at different Since Propane (LP) gas is heavier than air, there may be more odor at lower levels.
• Always be sensitive to the slightest gas odor. if you continue to detect any gas odor, no matter how small, treat it as a serious Immediately go into action as discussed previously.

ATTENTION – CRITICAL POINTS TO

• Propane (LP) gas has a distinctive Learn to recognize these odors. (Reference Fuel Gas Odor and Odor Fading sections to the left and above).
• Even if you are not properly trained in the service and repair of the heater, ALWAYS be consciously aware of the odors of propane (LP) gas and natural
• If you have not been properly trained in the repair and service of propane (LP) gas then do not attempt to light the heater, perform service or repairs, or make any adjustments to the heater on the propane (LP) gas fuel system.
• A periodic sniff test around the heater or at the heater’s joints; i.e. hose, connections, etc., is a good safety practice under any If you smell even a small amount of gas, CONTACT YOUR FUEL GAS SUPPLIER IMMEDIATELY. DO NOT WAIT!

GENERAL INFORMATION

A. The MHS15T and the MHS3OT are high-pressure propane appliances and are designed to be connected to a bulk propane tank.
B. These heaters are equipped with an automatic Safety Shutoff The gas flow will automatically stop if the heater fails to operate for any reason.
C. Maximum safety and convenience have been built into the Hi-Med-Lo-Off Control Valve/Regulator. The following table lists the approximate BTUs consumed and the operating hours you can reasonably expect from bulk propane Cylinders.
D. These heaters are for temporary heating of buildings under construction, alterations, or repair.

Figure­3.

FOR SAFE OPERATION

A.READ INSTRUCTIONS CAREFULLY: Read and adhere to these instructions. Do not allow anyone who has not read the instructions to assemble, light, adjust or operate the heater.

WARNING

KEEP THE HEATER OUT OF THE REACH OF CHILDREN
B.Use only in accordance with local codes or, in the absence of local codes, with the standard for the storage and handling of Liquefied Petroleum Gases ANSI/NFPA 58 and CSA B 149,1, Natural Gas and Propane Installation Code.

C. PROPANE IS VERY FLAMMABLE: In the event of a leak, propane will accumulate and the possibility of a fire is present. Propane gas is scented and its strong odor is readily detectable. Never strike a match or bring any flame or create an electric spark in an enclosure when you smell propane gas.  Ventilate the area thoroughly, move the heater outside, find and correct the source of the leak before attempting to light any appliance. If you are unsure of these instructions evacuate immediately and call for help.
D.GAS LEAKAGE: If the leak cannot be corrected do not tamper with the heater, follow the shutdown instructions and return the heater to the dealer or address given on the last page.

WARNING
DO NOT USE THIS HEATER ON BULK TANKS OF GREATER CAPACITY THAN 20 POUNDS LPG (50 POUNDS WATER CAPACITY).

E.LEAK DETECTION: Before each use of the heater check all fittings and connections with a soap solution to be sure there are no leaks. NEVER, NEVER USE ANY FLAME FOR LEAK TESTS.

F.CONNECTING HEATER TO PROPANE CYLINDER: Always connect the heater to the bulk cylinder in outdoors or in a well-ventilated area. NEVER connect this heater to a cylinder near an open flame.

G.USE OF HEATER: Always operate the heater with the propane cylinder in an upright position on a level non-combustible NEVER place the cylinder on its side when operating the heater.
H.ATTEND HEATER: Do not leave the heater unattended while it is in operation.

I.ALWAYS LIGHT HEATER WITH MATCH:

NEVER attempt to light the heater with a spark lighter.

J.DO NOT TAMPER: Should the heater not perform properly, such as little or no heat when operating in the “Hi” position, or for any other reason, DO NOT ATTEMPT TO REPAIR OR TAMPER with the heater. Any tampering could make the use of the heater unsafe and dangerous. Return the heater to the dealer or the address given on the last page for repair or re

K.FOR STORAGE: The heater Hi-Med-Lo-Off regulating valve should always be turned to “off” when the heater is not in Allow at least 15 minutes for cooling before handling and storing. Detach propane cylinder from heater before storing. DO NOT store propane cylinders indoors or near open flame or heat.
L. DO NOT TRANSPORT OR MOVE APPLIANCE WHILE IN OPERATION. FOLLOW SHUTDOWN AND STORAGE INSTRUCTIONS TO TRANSPORT OR MOVE THIS APPLIANCE.
VENTILATION
A. WARNING: This heater is an unvented appliance and MUST be used ONLY in a well-ventilated area. NEVER attempt to operate the heater inside any vehicle, camper or enclosure.
B. NOT FOR RESIDENTIAL INDOOR USE. Any combustion process requires and consumes oxygen, and will produce carbon monoxide. THIS HEATER MUST BE USED WITH ADEQUATE VENTILATION. Do not use inside a house, camper, tent or any type of unvented or a tightly enclosed area.
C. WARNING: Provide ample ventilation. This heater consumes air (oxygen). Do not use this heater in unventilated structures to avoid endangering your life. Provide additional ventilation for any additional fuel-burning appliances and additional occupants.
D. Flow of combustion and ventilation air must not be obstructed.

MINIMUM CLEARANCE FROM COMBUSTIBLE MATERIALS

A. When operating, the heater surfaces are extremely hot. Keep sleeping bags, clothing, and all combustible materials clear of the heater by at least the distances shown in Figure 4.

Figure­4.

B. WARNING: To avoid injury or property damage never allow clothing, tents or other combustible materials within 30″ of the face of the heater. This heater must be located at least 24″ above the floor level when in use. Never operate the heater when sleeping.
C. WARNING: Never direct the heat output of this heater toward any propane tank within 20 feet.

LIGHTING INSTRUCTIONS

A. Before attempting to light the heater, check all fittings and connections with a soap solution. NEVER USE A MATCH TO CHECK FOR LEAKS. Should a gas leak occur, do not attempt to repair or use the heater. Return the heater to your dealer or the address given on back page.
B. Fuel – This heater must be used only with a vapor withdrawal LP gas bulk cylinder. THE BULK TANK MUST BE EQUIPPED WITH A STANDARD POL VALVE.
WARNING
USE HD.5 PROPANE GAS ONLY. DO NOT USE ANY OTHER TYPE OF FUEL. SEE YOUR PROPANE DEALER IF YOU HAVE ANY QUESTIONS REGARDING FUEL.
C. Turn the heater’s “Hi-Med-Lo-Off” regulator knob to “Med” (counterclockwise).
D. To light the heater, place a lit match across the mesh screen where you see “light here” on the reflector. (See Figure 5) THEN push-in valve button on Safety Shutoff Valve. After the heater is lit, continue to hold the valve button in for 30 seconds, then release the button slowly. CAUTION: DO NOT PUSH IN VALVE BUTTON BEFORE INSERTING THE LIT MATCH. NEVER STAND IN FRONT OF THE HEATER WHILE LIGHTING. REPEAT STEP “D” FOR EACH BURNER.
E. If the burner does not light within 30 seconds, turn the heater’s regulator knob to “off” (clockwise) and allow at least five minutes for gas to dissipate before attempting to relight.
F. NOTE: Should the orifice become clogged as indicated by the low volume of gas when operating on “Hi” with a full cylinder, or should the heater fail to operate properly for any reason, return the heater to the dealer or the address given on the back page for repair or replacement. DO NOT ATTEMPT TO REPAIR OR TAMPER WITH THE HEATER.
G. Adjust heat output by turning the knob to the desired position.
H. DO NOT USE THIS HEATER FOR COOKING.

SHUTDOWN AND STORAGE INSTRUCTIONS

A. The bulk propane tank “on-off” valve should ALWAYS be completely turned “OFF” when the heater is not in use.
B. When shutting off the heater, turn the regulator knob on the heater to “OFF” (clockwise).
C. CAUTION: After turning the unit off, the heater will remain extremely hot. Allow at least 15 minutes for cooling before handling and storing. Detach heater from the bulk tank before handling and storage. REMEMBER – POL fitting is a left-hand thread.
D. HEATER STORAGE: Indoor storage of the heater is permissible only if the cylinder is disconnected and removed from the heater. Cylinders must be stored outdoors out of the reach of children and must not be stored in a building, garage or any other enclosed area. Store cylinders only in accordance with the Standard for the Storage and Handling of Liquefied Petroleum Gases ANSI/NFPA 58 and CSA 8149.1, Natural Gas and Petroleum Installation Code.
E. See page 7 for spare parts list.

MAINTENANCE

A. Remove thermocouple (3) retaining bracket screw from back of burner assembly (2). Remove bracket.
B. Note position of thermocouple (3) in retaining tabs on the back of the Burner assembly (2). Remove the thermocouple.
C. Remove wing bolt (18) and fiber washer (19) that attached the safety shut-off (6) to the burner assembly (2).
D. Slide the safety shut-off (6) from burner assembly (2).
E. Remove burner orifice (20) from the safety shut-off (6).
F. Clean burner orifice with compressed air (80 psi max).
G. Direct compressed air through the burner(2) venturi tube toward the burner plenum so that dust collected on the grid screen will be blown outward. Keep face away from the grid screen.
H. Reassemble heater in reverse order of disassembly.

WARNING
Air Quality Hazard

• Do not use this heater for heating human living quarters.
• Use of direct-fired heaters in the construction environment can result in exposure to levels of CO, CO2, and NO2 con­sidered to be hazardous to health and potentially life
• Do not use in unventilated areas.
• Know the signs of CO and CO2 Poisning.
• Headaches, stinging eyes
• Dizziness, disorientation
• Difficulty breathing feels of being suffocated
• Proper ventilation air exchange (OSHA 29 CFR 1926.57) to support combustion and maintain acceptable air quality shall be provided in accordance with OSHA 29 CFR Part 1926.154, ANSI10 Safety Requirements for Temporary and Por­table Space Heating Devices and Equipment used in the Construction Industry or the Natural Gas and Propane Installa­tion Codes CSA B 149.1.
• Periodically monitor levels of CO, CO2 and NO2 existing at the construction site – at the minimum at the start of the shift and after 4 hours.
• Provide ventilation air exchange, either natural or mechanical, as required to maintain acceptable indoor air quality.

• Ensure that the flow of combustion and ventilation air exchange cannot become obstructed.
• As the building ‘tightens up’ during the construction phases ventilation may need to be increased.

Installation of this appliance at altitudes above 2000 ft (610 m) shall be in accordance with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or National Standard of Canada, Natural Gas and Propane Installation Code, CSA 8149.1
The heater has been shipped from the factory set up for operation on propane gas.

Gas-fired Infra-Red
Tank Top Heater
CYLINDER NOT INCLUDED

WARNING: USE ONLY THE MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTS COULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLE DIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICE AGENCY.
PARTS ORDERING INFORMATION: PURCHASING: Accessories may be purchased at any Mr. Heater Products local dealer or direct from the factory FOR INFORMATION REGARDING SERVICE
Please call Toll-Free 800-251-0001 www.mrheater.com
Our office hours are 8:00 AM – 5:00 PM, EST, Monday through Friday. Please include the model number, date of purchase, and description of the problem in all communication.
LIMITED WARRANTY
Mr. Heater, Inc. warrants its heaters and accessories to be free from defects in material and workmanship for a period of 1 year from date of purchase. Mr. Heater, Inc. will repair or replace this product free of charge if it has been proven to be defective within the 1-year period, and is returned at customer expense with proof of purchase to Mr. Heater, Inc. within the warranty period.
Mr. Heater, Inc. reserves the right to make changes at any time, without notice or obligation, in colors, specifications, accessories, materials and models.
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