Mr. Heater MHU 80 User Manual

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
•
Immediately call your gas supplier from a phone remote from the building. Follow the
gas suppliers instructions.
 •
If you cannot reach your gas supplier, call the Fire Department.
-- 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.
20176 0185
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.
Model#
www.mrheater.com •800-251-0001
COMPACT UNIT HEATER
FOR RESIDENTIAL/COMMERCIAL USE
MHU50
MHU80
MHU125
®

Mr. Heater MHU 80 Specifications

General

Brand	Mr. Heater
Model	MHU 80
Category	Heater
Language	English

Summary

Introduction and General Information

LANGUAGES

Lists available languages for the manual and user interface.

GENERAL INFORMATION

Provides essential product details, contact info, and safety advice.

UNIT DIMENSIONS

Details physical size, mounting slots, and key measurements.

Installation Requirements and Procedures

SHIPPING

Instructions for checking the unit for shipping damage upon arrival.

CSA REQUIREMENTS

Installation standards for USA and Canada, including garage and aircraft hanger specifics.

UNIT HEATER INSTALLATION

Step-by-step guide for mounting and positioning the heater unit.

COMBUSTION AND VENTILATION AIR

Crucial requirements for adequate air supply for safe and efficient operation.

VENTING

Comprehensive guidance on vertical, horizontal, and masonry chimney venting.

Gas and Electrical Connections

ELECTRICAL CONNECTIONS

How to safely connect the unit to the electrical power supply.

GAS CONNECTION

Instructions for safely connecting the gas supply line, including pressure.

LEAK CHECK

Procedures for detecting gas leaks after installation.

Operation and Controls

START-UP AND OPERATION

Guides initial startup, burner ignition, and normal operational sequences.

IGNITION CONTROL AND LIMITS

Explains ignition sequences, LED indicators, and limit control functions.

LOUVER VANE ADJUSTMENTS

How to adjust air direction louvers for optimal airflow.

HIGH ALTITUDE OPERATION

Adjustments required for units operating at higher altitudes.

Maintenance and Troubleshooting

SERVICE PROCEDURES

Covers routine maintenance for burners, blowers, and flue passages.

FAILURE TO OPERATE

Troubleshooting guide for common operational issues and checks.

Conversion, Wiring, and Parts

WIRING DIAGRAM

Visual schematic of the unit's electrical connections.

FUEL CONVERSION

Detailed instructions for converting the unit between gas types.

REPAIR PARTS

Information and diagrams for identifying and ordering replacement parts.

PARTS ORDERING INFORMATION

How to purchase parts and accessories directly or through dealers.

Warranty and Registration

LIMITED WARRANTY

Explains the product's warranty terms, duration, and claim process.

PRODUCT REGISTRATION

Instructions for registering the product for warranty purposes.