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.
MH75KT
MH125KT
MH175KT
KEROSENE
FORCED-AIR HEATER
WARNING:
— 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. Refer to page 3.
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.
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:
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 WHICH DO OR MAY CONTAIN VOLATILE OR
AIRBORNE COMBUSTIBLES, OR PRODUCTS SUCH AS
GASOLINE, SOLVENTS, PAINT THINNER, DUST PARTICLES OR UNKNOWN CHEMICALS.
WARNING:
The State of California requires the following 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).
Certification: ................................UL .................................................... UL .................................................UL
OPERATING PRECAUTIONS
This is a kerosene, direct-fired, forced air heater. It's 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. We can
tolerate small amounts but not a lot. 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
So, be sure to follow advice about ventilation in these operating
instructions.
Forced Air means that a blower or fan pushes the air through
the heater. Proper combustion depends upon this air flow;
therefore, the heater must not be revised, modified or operated
with parts removed or missing. Likewise, safety systems must not
be circumvented or modified in order 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.Check the heater thoroughly for damage. DO NOT operate a
damaged heater.
2.DO NOT modify the heater or operate a heater which has
been modified from its original condition.
3.Use only Kerosene or #1 fuel oil. Never use gasoline,
naphtha, paint thinner, alcohol or other fuels of any kind.
4.For indoor use only. Use only in well ventilated areas.
Provide at least 2 sq. ft. of opening near the floor and
2 sq.ft. of opening near the ceiling. (Also see "Operating
Precautions").
5.Install the heater such that it is not directly exposed to
water spray, rain and/or dripping water.
6.Maintain minimum clearance from normal combustible
material (like paper) at least 8 ft. from the heater outlet and
3 ft. from the top, sides and inlet. Locate 10 ft. from canvas
or plastic coverings and secure them to prevent flapping or
movement.
7.Due to the high surface and exhaust temperatures, adults
and children must observe clearances to avoid burns or
clothing ignition.
8.Never use in areas normally for habitation and/or where
children may be present.
9.Operate only on a stable, level surface.
10. Do not use with duct work. Do not restrict inlet or exit.
11. Use only the electrical power specified. The electrical
connection and grounding must comply with National
Electrical Code - ANSI/NFPA 70 (USA) and CSA C22.1
Canadian Electrical Code, Part 1 (Canada).
12. Use only a properly grounded 3-prong receptacle or
extension cord.
13. Do not move, handle or service while hot or burning.
14. Use only in accordance with local codes and federal
ordinances.
Operating Instructions and Owner’s ManualMr. Heater |Kerosene Forced Air Heater
3
Page 4
OPERATING INSTRUCTIONS
UNPACKING
1.Remove all protective material which may have been applied
to the heater for shipment.
2.Remove heater from carton.
3.Check the heater for possible shipping damage. If any
damage is found immediately notify the dealer from whom
you purchased the heater.
ASSEMBLY (For 125,000 and 175,000 BTU/hr models only)
Wheel 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" nutdriver, 3/8" open or
adjustable wrench and standard pliers.
1.Assemble the wheels onto the wheel support frame as
follows:
a.Install one of the cotter pins into the hole on one end of
axle.
b.Slide the large washer, then wheel onto the axle next to
the cotter pin.
c.Slide a small washer, spacer, small washer onto the axle
next to the wheel.
d.Slide the partially assembled axle through the wheel
support frame.
e.Slide the small washer, spacer, and small washer onto
the axle next to the wheel support.
f.Slide the wheel then large washer onto the axle and
hold in place with the remaining cotter pin.
g.Install the caps over the larger washers to finish the
wheel assembly.
2.Position the heater on the wheel support frame assembly
with the exit end over the wheels.
3.Use eight screws and nuts to attach the handles to the top of
the tank flange. The screws will go through the handles,
tank flange and wheel support frame. Install the nuts and
finger tight only until all nuts are installed.
4.Tighten all the nuts.
5.Attach cord caddies to handles using No. (14) & No. (5)
screws and nuts.
PREPARING FOR OPERATION
1.Check the heater for possible shipping damage. If any is
found, immediately notify the factory.
2.Follow all of the "Precautions".
3.Fill the fuel tank with clean kerosene, No. 1 fuel oil or No. 1
diesel fuel only. Kerosene is recommended for use when the
temperature drops below 0°F (-18°C). 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 (4 liters) of fuel in the tank. When filling the heater,
use at least 2 gallons (8 liters) of fuel. Be sure heater is level
and do not overfill. Use a funnel or can with a long fill spout.
IMPORTANT: Before filling fuel tank the first time or after
extended storage periods, drain the fuel tank of any moisture
or condensation.
4.Locate heater at a safe distance from combustible materials.
Model MH75KT is 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 think and
extending 3 ft. or more beyond the heater in all directions.
START
1.Turn thermostat to lowest setting. Plug heater into a well
grounded 115V, 60HZ, 1Ø outlet. Turn thermostat to highest
setting. Start heater by pushing toggle switch to "ON"
position (light signifies switch is in "ON" position). Adjust
thermostat to desired setting. Heater will cycle on/off, as
heat is required.
In cold weather, starting may be improved by holding a
finger over the end of the pressure adjusting screw until the
heater starts. This unit is equipped with a circuit breaker
located near the power cord. If the unit does not start,
check to see that the reset button is pressed in.
STOP
1.For a short duration shutdown, press toggle switch to "OFF"
position. For extended shutdown, unplug the heater.
Mr. Heater | Kerosene Forced Air HeaterOperating Instructions and Owner’s Manual
4
Page 5
MAINTENANCE AND STORAGE
WARNING. To prevent personal injury, unplug the heater
from the wall outlet before servicing.
For maximum efficiency and trouble-free service, make the
following periodic maintenance, cleaning and inspections.
DAILY SCHEDULE
1.GENERAL. Make general visual inspection of 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 heater
again. Check heater operation to be sure it is operating
normally (See "Servicing" section for 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 thoroughly and replace. Do not oil the
filter element. If your heater is used where there is
considerable dust or dirt, clean as often as necessary
(approximately every 50 hrs.).
2.REMOVE DUST. Clean heater twice a season (more often
under dusty conditions). Remove accumulated dust from the
transformer, burner, motor and fan blades with compressed
air. Wipe area clean with a clean dry cloth. Inspect area to
insure 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 reduction of fuel and air flow. 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 cleaned filter in 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 fuel line and direct
compressed air through the filter in the opposite direction of
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 unit.
4.AIR PRESSURE SETTING. The air pressure has been properly
set at the factory. If the air pressure is out of adjustment, it
will most likely be caused by dirty air filters, a partially
plugged nozzle, an air leak in the system or improperly set
pressure. If adjustment becomes necessary, first determine
the proper pressure setting for your heater which is printed
on the serial label located on the fuel tank. Remove the plug
from the air filter cover and attach an accurate pressure
gauge calibrated to a maximum reading of 15 PSI. Start the
heater and note the pressure reading. If the pressure is low,
slowly turn the pressure adjusting screw in (Clockwise) until
the correct pressure is obtained. If the air pressure is high,
turn the adjusting screw out (counterclockwise) until the
pressure is correct. When correct pressure is reached, unplug
the heater, remove the gauge and replace the plug.
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 completely filling the
tank with fuel for extended storage to minimize condensation
inside the tank.
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 properly:
*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 shut downs of the
heater.
The parts lists and wiring diagram show the heater as it was
constructed. Do not use a heater which is different from that
shown. Heater performance is effected 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.
In-warranty products will be repaired with no charge for either
parts or labor. Please include a brief statement indicating date,
place of purchase, the nature of the problem and proof of
purchase.
Out-of-warranty products will be repaired with a charge for parts
and labor.
Operating Instructions and Owner’s ManualMr. Heater |Kerosene Forced Air Heater
5
Page 6
WIRING DIAGRAM
PARTS LIST
Ref. # Item #Item #Item #Description
MH75KT MH125KT MH175KT
1 ........ 1036 ....... 1036 ........... 1036 ......... Power Cord
* .......M8682 .... M8683 ....... M8683 ..... Logo, Mr. Heater
Mr. Heater | Kerosene Forced Air HeaterOperating Instructions and Owner’s Manual
6
Page 7
Mr. Heater • Kerosene Forced Air Construction Heater • Model #MH75KT, #MH125KT and #MH175KT
Operating Instructions and Owner’s ManualMr. Heater |Kerosene Forced Air Heater
7
Page 8
Model #
OPERATING INSTRUCTIONS
MH75KT
MH125KT
AND OWNER’S MANUAL
MH175KT
WARNING:
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.
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 • www.mrheater.com
Our office hours are 8:30 AM – 5:00 PM, EST, Monday through Friday.
Email to: techservice@enerco-mrheater.com
Please include the model number, date of purchase, and description of problem in
all communication.
LIMITED WARRANTY
The company warrants this product to be free from imperfections in material or
workmanship, under normal and proper use in accordance with instructions of The
Company, for a period of one year from the date of delivery to the buyer. The Company, at
its option, will repair or replace products returned by the buyer to the factory,
transportation prepaid within said one year period and found by the Company to have
imperfections in material or workmanship.
If a part is damaged or missing, call our Technical Support Department at 800-251-0001.
Address any Warranty Claims to the Service Department, MR. HEATER INC., 4560 W. 160TH
ST., CLEVELAND, OHIO 44135. Include your name, address and telephone number and
include details concerning the claim. Also, supply us with the purchase date and the name
and address of the dealer from whom you purchased our product.
The foregoing is the full extent of the responsibility of the Company. There are no other
warranties, express or implied. Specifically there is no warranty of fitness for a particular
purpose and there is no warranty of merchantability. In no event shall the Company be
liable for delay caused by imperfections, for consequential damages, or for any charges of
the expense of any nature incurred without its written consent. The cost of repair or
replacement shall be the exclusive remedy for any breach of warranty. There is no warranty
against infringement of the like and no implied warranty arising from course of dealing or
usage of trade. This warranty will not apply to any product which has been repaired or
altered outside of the factory in any respect which in our judgment affects its condition or
operation.
Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. This Warranty gives you
specific legal rights, and you may 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.