MR HEATER GAS-FIRED INFRA-RED Tank Top Heater MHS15T Manual

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
OPERATING INSTRUCTIONS
AND OWNER’S MANUAL
Model #
MHS15T
MHS30T

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.

Valve Position	Model
	MHS15T		MHS3OT
	BTU Input	Hours w/201b. Tank	BTU Input	Hours w/ 201b. Tank
Hi	15,000	28	30,000	14
Med	12,000	36	24,000	18
Lo	10,000	43	10,000	43

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.

BTU/HR. Rating		Normal Operating Procedure	Clearances to Combustibles
Model no.	Gas Propane		From C.L. OF HTR. TO FLOOR	FRONT	SIDES	REAR	CEILING
MHS15T	15,000	Vertical	24″	30″	30″	30″	30″
MHS3OT	30,000	Vertical	24″	30″	30″	30″	36″

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.

	USA 8-Hr Time-weighted average (OSHA 29 CFR 1926.55 App A)	Canada 8-hr time-weighted average WorkSafe BC OHS Guidelines Part 5.1 and Ontario Workplaces Reg 833
CO	50 ppm	25 ppm
CO,	5000 ppm	5000 ppm
NO.		3 ppm (Reg 833)
	USA – Ceiling Limit (Short Term Exposure Limit = 15 minutes)	Canada STEL (15 minutes Reg 833/1 hour WSBC) WorkSafe BC OHS Guidelines Part 5.1 and Ontario Workplaces Reg 833
CO		100 ppm
CO:		15000 ppm (WSBC) 30000 ppm (Reg 833)
NO2	5 ppm	1.0 ppm (WorkSafeBC) 5.0 ppm (Reg 833)

• 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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Mr. Heater, Inc., 4560 W. 160TH ST., CLEVELAND, OHIO 44135
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Heater, Inc. 2020, Mr. Heater, Inc. All rights reserved