Mr. Heater MHU 45 Operating Instructions And Owner's Manual

Mr. Heater MHU 45 Operating Instructions And Owner's Manual

Mr. heater compact unit heater

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OPERATING INSTRUCTIONS AND OWNER'S MANUAL
MR. HEATER
MHU 45
MHU 75
COMPACT UNIT 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
Open Windows
DO NOT try to light any appliance.
DO NOT use electrical switches.
DO NOT use any telephone in your house. Immediately call your local gas supplier from a
neighbor's telephone. Follow the gas supplier's instructions.
Do not touch any electrical switch; do not use any phone in your building.
Installation and service must be performed by a qualified installer, service agency or the gas
supplier.
If you cannot reach your gas supplier, call the Fire Department.
FOR YOUR SAFETY:
Do not store or use gasoline or other flammable vapors and liquids in the vicinity 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.
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.
ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 • 216-881-5500
Operational Instructions Only - No Parts List
HEATSTAR
HSU 45
HSU 75
09/08 Revision B #60016

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Summary of Contents for Mr. Heater MHU 45

  • Page 1 Place instructions in a safe place for future reference. Do not allow HSU 45 anyone who has not read these instructions to MHU 45 HSU 75 assemble, light, adjust or operate the heater. MHU 75 COMPACT UNIT HEATER...
  • Page 2 04/07 Revision B #60016 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual...
  • Page 3: Table Of Contents

    WARNING: WARNING: YOUR SAFETY IS IMPORTANT TO YOU AND TO OTHERS, FIRE, BURN, INHALATION, AND EXPLOSION HAZARD. SO PLEASE READ THESE INSTRUCTIONS BEFORE YOU KEEP SOLID COMBUSTIBLES, SUCH AS BUILDING OPERATE THIS HEATER. MATERIALS, PAPER OR CARDBOARD, A SAFE DIS- TANCE AWAY FROM THE HEATER AS RECOMMENDED GENERAL HAZARD WARNING: BY THE INSTRUCTIONS NEVER USE THE HEATER IN...
  • Page 4: Unit Dimensions

    MHU45/MHU75 AND HSU45/HSU75 UNIT DIMENSIONS (N-NATURAL GAS, P-PROPANE) HANGING BRACKETS MOUNTING SLOTS (Typical) 5/16 x 3 Inches (8 x 76 mm) DIMENSION FLOW 12 (305) 17 (432) 5-1/2 (140) 6-1/2 (165) 4-1/4 (108) 6-3/4 (171) HEAT EXCHANGER (ALUMINIZED STEEL) TOP VIEW ELECTRICAL HANGING INLETS...
  • Page 5: Shipping

    SHIPPING TABLE 1 UNIT CLEARANCES The heater is completely assembled. Installation instructions, two mounting brackets (shipped loose), and a flue transition are Sides Access Panel included. Check the unit for shipping damage. The receiving party should contact the last carrier immediately if any shipping damage is found.
  • Page 6: Unit Heater Installation

    These units are approved for residential applications. For Code, ANSI Z223.1, in the U.S.A., CSA B149.1 Natural Gas and installation in a residential garage, these units must be installed so Propane Installation Code, or applicable provisions of local building that burners and ignition source are located no less than 18” codes.
  • Page 7 B – VERTICAL VENTS USING METAL VENT PIPE C – HORIZONTAL VENTING – GENERAL – COMMERCIAL AND RESIDENTIAL Common venting is not allowed when horizontally venting the unit INSTALLATIONS heater. The minimum horizontal vent length is three feet (914mm). MHU/HSU compact unit heaters are listed as Category I appliances for vertical vent installations.
  • Page 8 Vent termination must be a minimum of 4' (1.2m) below or 4’ transition piece (supplied) is required to fit over the outlet of (1.2m) horizontally from any soffit vent or under-eave vent. the induced draft assembly on the appliance. Vent must be a minimum of 6' from an inside corner formed Refer to table 2 for maximum vent connector lengths.
  • Page 9 HORIZONTAL VENTING - RESIDENTIAL INSTALLATION INDUCED DRAFT BLOWER UPWARD SLOPE 12 INCHES MIN. (30.5CM) FLUE TRANSITION (PROVIDED) VENT TERMINATION CAP LISTED THIMBLE THROUGH COMBUSTION WALL MAY BE SINGLE WALL (26 GSG) GALV. OR EQUIV. STAINLESS STEEL SEALED ACCORDING TO THESE INSTALLATION INSTRUCTIONS OR A SINGLE SECTION OF TYPE B-1 VENT.
  • Page 10: Venting

    Follow the lighting instructions. Place the appliance being LINE VOLTAGE FIELD WIRING inspected in operation. Adjust thermostat so appliance will operate continuously. Test for spillage at the draft hood relief opening after five UNIT minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.
  • Page 11: Gas Connection

    NOTE The MHU/HSU series unit heaters use a direct spark CAUTION DO NOT use matches, candles, flame or other sources ignition system. There is no pilot necessary as the spark lights the of ignition to check for gas leaks. main burner as the gas valve is turned on. The direct spark ignition IMPORTANT The heater and its individual shut off valve must be control board emits radio noise as the sparking process is disconnected from the gas supply piping system during any...
  • Page 12: Heating Sequence Of Operation

    predominantly blue in color and shall be approximately ROBERTSHAW 2000DER GAS VALVE centered in the tubes with no apparent impingement taking place. GAS VALVE KNOB SHOWN MANIFOLD IN OFF POSITION PRESSURE TAP The ignition control will energize the fan approximately 45 seconds after ignition is established.
  • Page 13: Service

    the hourly flow of gas. before manually resetting switch. GAS PRESSURE 1. Check gas line pressure with unit firing at maximum rate. A SERVICE minimum of 5.0" w.c. for natural gas or 10.4" w.c. for LP/ propane gas should be maintained for proper unit operation. CAUTION Turn off gas and electrical power to unit before performing any maintenance or service operations on this unit.
  • Page 14: Wiring Diagram

    WIRING SCHEMATIC FOR UNITS WITH 6-PIN CONNECTOR GCI-3A (23L53) CONTROL BOARD OPTIONAL THERMOSTAT INSTALLATION IT IS RECOMMENDED TO USE 18AWG WIRE WHEN INSTALLING THE THERMOSTAT. CONNECT THERMOSTAT WIRING TO TERMINALS ‘R’ AND ‘W’ AS ILLUSTRATED ON THE SCHEMATIC DIAGRAM. (OPTIONAL) DISCONNECT ALL POWER THERMOSTAT BEFORE SERVICING.
  • Page 15 Restore electrical power and gas supply. Follow lighting Check all vent and vent connector joints for tightness. Ensure that instructions to light unit. Check operation of unit. connections are sealed and that there are no blockages. COMBUSTION AIR BLOWER FAILURE TO OPERATE Under normal operating conditions, the combustion air blower If unit fails to operate check the following: should be checked and cleaned prior to the heating season with...
  • Page 16: Parts List

    Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual4/07 Revision B #60016...
  • Page 17 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual 04/07 Revision B #60016...
  • Page 18: Warranty

    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 • www.enerco.com Our office hours are 8:30 AM –...

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Hsu 45Hsu 75Mhu 75

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