OPERATING INSTRUCTIONS AND OWNER'S MANUAL
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:
Improper installation, adjustment, alteration, service or maintenance
can cause injury or property damage. Refer to this manual. For assistance or
additional information consult a qualified installer, service agency or the gas supplier.
— WHAT TO DO IF YOU SMELL GAS
DO NOT try to light any appliance.
•
DO NOT touch any electrical switch; do not use any phone in your building.
•
Leave the building immediately
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Immediately call your gas supplier from a phone remote from the building. Follow the
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gas suppliers instructions.
If you cannot reach your gas supplier, call the Fire Department.
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-- Installation and service must be performed by a qualified installer, service agency or the
gas supplier.
FOR YOUR SAFETY:
Do not store or use gasoline or other flammable vapors and liquids in the vicin-
ity of this or any other appliance.
WARNING: If the information in these instructions are not followed exactly, a fire
or explosion may result causing property damage, personal injury or loss of life.
COMPACT UNIT HEATER
FOR RESIDENTIAL/COMMERCIAL USE
®
www.mrheater.com
800-25 1-0001
•
Model #
MHU 50
MHU 80
60185
2015
Need help?
Do you have a question about the MHU 50 and is the answer not in the manual?
Questions and answers
I have a 50,000 btu unit but it doesn't seem to be putting out much heat at all. What could cause that problem?
A Mr. Heater MHU 50 unit may not produce much heat due to several possible reasons:
1. Gas Supply Issue – The gas valve may not be fully open, or there may be a problem with the gas supply, such as low pressure or an obstruction in the gas line.
2. Orifice Blockage – The gas orifice (part 8) could be clogged, restricting the fuel flow.
3. Ignition or Burner Problem – A faulty igniter electrode (part 3) or burner (part 5) could lead to incomplete combustion.
4. Sensor Malfunction – A defective electrode sensor (part 4) or limit sensor (part 2) may cause the unit to shut down or operate at reduced efficiency.
5. Gas Conversion Issue – If the unit was converted between natural gas and propane, an incorrect orifice or gas valve may have been installed.
6. Ventilation Problem – Poor venting can affect combustion, reducing heat output.
Checking and addressing these issues may restore proper heat output.
This answer is automatically generated