Mr. Heater MHU 75 - Manuals

Page 2 - GENERAL HAZARD WARNING:; ONLY PERSONS WHO CAN UNDERSTAND AND FOLLOW; The State of California requires the following warning:; CONTENTS

2 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual GENERAL HAZARD WARNING: FAILURE TO COMPLY WITH THE PRECAUTIONS ANDINSTRUCTIONS PROVIDED WITH THIS HEATER, CANRESULT IN DEATH, SERIOUS BODILY INJURY ANDPROPERTY LOSS OR DAMAGE FROM HAZARDS OF FIRE,EXPLOSION, BURN, ASPHYXIATION, ...

Page 3 - SIDE VIEW; START–UP AND PERFORMANCE CHECK LIST; BACK VIEW

3 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater MHU45/MHU75 AND HSU45/HSU75 UNIT DIMENSIONS (N-NATURAL GAS, P-PROPANE) GAS INLET SIDE VIEW SERVICE ACCESS PANEL HANGING BRACKETS (2) ADJUSTABLE LOUVERS TOP VIEW MOUNTING SLOTS (Typical)5/16 x 3 Inches (8 x 76 mm) HANGING BRACKE...

Page 4 - SHIPPING; table 1; GARAGE INSTALLATIONS:; TABLE 1

4 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual SHIPPING The heater is completely assembled. Installation instructions, twomounting brackets (shipped loose), and a flue transition areincluded. Check the unit for shipping damage. The receivingparty should contact the last car...

Page 5 - UNIT HEATER INSTALLATION; figure 1; VENTING; TABLE 2; FIGURE 1; COMBUSTION AND VENTILATION AIR

5 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater These units are approved for residential applications. For installation in aresidential garage, these units must be installed so that burners andignition source are located no less than 18” (457mm) above floor. Heatermust be lo...

Page 6 - figure 2; C – HORIZONTAL VENTING – GENERAL; VENT TERMINATION ON SINGLE WALL VENT; FIGURE 2

6 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual B – VERTICAL VENTS USING METAL VENT PIPE– COMMERCIAL AND RESIDENTIALINSTALLATIONS MHU/HSU compact unit heaters are listed as Category Iappliances for vertical vent installations. 1. MHU/HSU unit heaters are to be used with NFPA...

Page 7 - D – HORIZONTAL VENTING – COMMERCIAL; FIGURE 3

7 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater 5. Vent termination must be a minimum of 4' (1.2m) below or 4’ (1.2m) horizontally from any soffit vent or under-eave vent. 6. Vent must be a minimum of 6' from an inside corner formed by two exterior walls. If possible, leave ...

Page 8 - F – VENTING USING A MASONRY CHIMNEY; IMPORTANT; HORIZONTAL VENTING - RESIDENTIAL INSTALL ATION; G – REMOVAL OF UNIT FROM COMMON VENT

8 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual F – VENTING USING A MASONRY CHIMNEY The following additional requirements apply when a lined masonrychimney is being used to vent the compact unit heater. 1. Masonry chimneys used to vent Category I units heaters must be either...

Page 9 - ELEC TRICAL CONNECTIONS; NOTE; WARNING

9 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater 5. Test for spillage at the draft hood relief opening after fiveminutes of main burner operation. Use the flame of amatchor candle, or smoke from a cigarette, cigar, or pipe. 6. After it has been determined that each appliance ...

Page 10 - GAS CONNECTION; UNIT START–UP

10 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual control board emits radio noise as the sparking process isunderway. The level of energy may be sufficient to disturb a logiccircuit in a microprocessor controlled thermostat. It isrecommended that an isolation relay be used wh...

Page 11 - ADJUSTMENTS; table 4; ROBERTSHAW 2000DER GAS VALVE; LED

11 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater 13. If appliance still will not operate, follow the instructions “TO TURN OFF GAS TO UNIT” and call your service technician orgas supplier. TO TURN OFF GAS TO UNIT 1. Set thermostat to lowest level. 2. Turn off all electrical ...

Page 12 - SERVICE; C AUTION; TABLE 4

12 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual 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. 2. After line pressure has been checked and adjusted, check manifold pressure. Correct manifold pres...

Page 13 - WIRING SCHEMATIC FOR UNITS WITH

13 Operating Instructions and Owner’s Manual Enerco | Compact Unit Heater WIRING SCHEMATIC FOR UNITS WITH 6-PIN CONNECTOR SCN-KWC CONTROL BOARD NOTE:IFANYOFTHEORIGINALWIREASSUPPLIEDWITHTHEAPPLIANCEMUSTBEREPLACED,ITMUSTBEREPLACEDWITHWIRINGMATERIALHAVINGATEMPERATURERATINGOFATLEAST105 ° C. LADDER DIAGR...

Page 14 - SEE BACK PAGE FOR PARTS ORDERING INFORMATION; COMBUSTION AIR BLOWER

14 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual PARTS LIST: SEE BACK PAGE FOR PARTS ORDERING INFORMATION COMBUSTION AIR BLOWER Under normal operating conditions, the combustion air blowershould be checked and cleaned prior to the heating season withthe power supply disconne...

Page 16 - PARTS ORDERING INFORMATION:; Accessories may be purchased at any Enerco / Mr. Heater local dealer; FOR INFORMATION REGARDING SERVICE; LIMITED WARRANTY; READ INSTRUC TIONS C AREFULLY:; Read and; OPERATING INSTRUCTIONS AND OWNER’S MANUAL

16 Enerco | Compact Unit Heater Operating Instructions and Owner’s Manual WARNING: USE ONLY MANUFACTURER’S REPLACEMENT PARTS. USE OF ANY OTHER PARTSCOULD CAUSE INJURY OR DEATH. REPLACEMENT PARTS ARE ONLY AVAILABLEDIRECT FROM THE FACTORY AND MUST BE INSTALLED BY A QUALIFIED SERVICEAGENCY. PARTS ORDER...