OPERATING INSTRUCTIONS AND OWNER’S MANUAL MR. …

1 START SN#0253700 - OPERATING INSTRUCTIONS AND owner 'S MANUAL . READ INSTRUCTIONS CAREFULLY: Read and MR. HEATER follow all INSTRUCTIONS . Place INSTRUCTIONS in a HEATSTAR. safe place for future reference. Do not allow MHU 45 anyone who has not read these INSTRUCTIONS to HSU 45. MODEL. MODEL. MHU 75 assemble, light, adjust or operate the heater. HSU 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.

2 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.

3 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. ENERCO GROUP, INC., 4560 W. 160TH ST., CLEVELAND, OHIO 44135 216-881-5500 04/07 Revision B #60016. 04/07 Revision B #60016 Enerco | Compact Unit Heater 2 OPERATING INSTRUCTIONS and owner 's MANUAL 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.

4 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. FAILURE TO COMPLY WITH THE PRECAUTIONS AND SPACES WHICH DO OR MAY CONTAIN VOLATILE OR. INSTRUCTIONS PROVIDED WITH THIS HEATER, CAN AIRBORNE COMBUSTIBLES, OR PRODUCTS SUCH AS. RESULT IN DEATH, SERIOUS BODILY INJURY AND GASOLINE, SOLVENTS, PAINT THINNER, DUST PAR- PROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE, TICLES OR UNKNOWN CHEMICALS. EXPLOSION, BURN, ASPHYXIATION, CARBON MONOX- IDE POISONING, AND/OR ELECTRICAL SHOCK.

5 WARNING: ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW The State of California requires the following warning: THE INSTRUCTIONS SHOULD USE OR SERVICE THIS. COMBUSTION BY-PRODUCTS PRODUCED WHEN. HEATER. USING THIS PRODUCT CONTAIN CARBON MONOXIDE, IF YOU NEED ASSISTANCE OR HEATER INFORMATION. A CHEMICAL KNOWN TO THE STATE OF CALIFORNIA. SUCH AS AN INSTRUCTIONS MANUAL , LABELS, ETC. TO CAUSE CANCER AND BIRTH DEFECTS (OR OTHER. CONTACT THE MANUFACTURER. REPRODUCTIVE HARM). CONTENTS. UNIT DIMENSIONS .. 4. SHIPPING .. 5.

6 REQUIREMENTS .. 5. UNIT HEATER installation .. 6. COMBUSTION & VENTILATION AIR .. 6. VENTING .. 6 - 10. ELECTRICAL CONNECTIONS .. 10. GAS CONNECTION .. 11. LEAK CHECK .. 11. START-UP OPERATION .. 11. HEATING SEQUENCE OF OPERATION .. 12. IGNITION CONTROL LED .. 12. ADJUSTMENTS .. 12. SERVICE .. 13. WIRING DIAGRAM .. 14. PARTS LIST .. 16. WARRANTY .. 18. Enerco | Compact Unit Heater 3 OPERATING INSTRUCTIONS and owner 's MANUAL 04/07 Revision B #60016. MHU45/MHU75 AND HSU45/HSU75 UNIT DIMENSIONS. (N- natural GAS, P- propane ).

7 HANGING. BRACKETS MOUNTING SLOTS (Typical). 5/16 x 3 Inches (8 x 76 mm). AIR. FLOW DIMENSION 45 75. A 12 (305) 17 (432). B 5-1/2 (140) 6-1/2 (165). C 4-1/4 (108) 6-3/4 (171). HEAT EXCHANGER. (ALUMINIZED STEEL). TOP VIEW. ELECTRICAL. INLETS HANGING. BRACKETS (2). FLUE ADJUSTABLE. DIRECT GAS. OUTLET SERVICE LOUVERS. DRIVE FAN INLET. ACCESS PANEL. SIDE VIEW. START UP AND PERFORMANCE CHECK LIST. Job Name: _____ Job No.: _____ Date: _____. Job Location: _____ City: _____ State/Province: _____. Installer: _____ City: _____ State/Province: _____.

8 Unit Model No.: _____ Serial No.: _____ Service Technician: _____. Electrical Connections Tight? _____ Flue Connections Tight? _____. Supply Voltage _____ Fan Timer Operation Checked? _____. Gas Piping Connections Tight & Leak-Tested? _____ THERMOSTAT. Motor Amps _____ Calibrated? _____. Furnace Btu Input _____ Heat Anticipator Properly Set? Line Pressure _____ Level? _____. Manifold Pressure _____. 04/07 Revision B #60016 Enerco | Compact Unit Heater 4 OPERATING INSTRUCTIONS and owner 's MANUAL SHIPPING TABLE 1.

9 UNIT CLEARANCES. The heater is completely assembled. installation INSTRUCTIONS , two mounting brackets (shipped loose), and a flue transition are included. Check the unit for shipping damage. The receiving Top Sides Access Panel party should contact the last carrier immediately if any shipping in mm in mm in mm damage is found. 1 25 1 25 18 457. Bottom Rear Single Wall Vent*. in mm in mm in mm REQUIREMENTS CSA IN THE USA 0 0 18 456 6 152. installation of gas unit heaters must conform with local building *Except for listed clearance thimbles.

10 Codes or, in the absence of local codes, with the current National Fuel Gas Code ANSI installation in aircraft hangers must be in accordance with the current Standard for Aircraft Hangers ANSI/NFPA No. 409. REQUIREMENTS CSA IN CANADA. installation in parking structures must be in accordance with the The INSTRUCTIONS are intended only as a general guide and do not current Standard for Parking Structures ANSI/NFPA No. 88A. supersede local codes in any way. Authorities having jurisdiction should be consulted before installation .