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Manual Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000

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  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 1

    POR T ABLE G A SOLINE GENER A T OR S OWNER’S OPERA TION AND INST ALLA TION MANUAL R Generator Models: MGH3000, MGH4000A, MGH5000A, MGH6000, and MGH7000 IMPORTANT Read and understand this manual before operating or servicing generator. Improper use of generator can cause serious injury. Keep this manual for future reference. FUEL F RESET 120/240 V ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 2

    2 SECTION PAGE Safety Information ....................................................................... 3 Product Identification .................................................................. 6 General Information .................................................................... 7 Specifications ............................................ ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 3

    3 SAFETY INFORMA TION W ARNINGS IMPORTANT: Read this owner’s manual and the engine owner’s manual carefully. Become familiar with this generator before trying to operate or service it. Know its uses, limitations, and any hazards involved. Improper use of generator can cause severe injury or death from explosion, fire, burns, electrical shock, o ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 4

    4 SAFETY INFORMA TION Continued 2. ! WARNING Guard against fire hazard. Keep operation area well-vented. Keep generator at least three feet away from any object. Do not place flam- mable objects near generator. • Do not use generator where flammable vapors are present. Some vapors are heavier than air. These vapors settle in low-lying places. • ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 5

    5 SAFETY INFORMA TION Continued 8. ! WARNING Battery contains sulfuric acid. Battery acid is poisonous if swallowed. Contact with skin or eyes may cause severe burns. Do not tilt generator with battery installed. Tilting could cause battery acid to spill. Wear protective clothing and face shield when servicing. Keep out of children’s reach. 9. ! ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 6

    6 FUEL F FUEL F FULL POWER SELECTOR 120 ONLY 120 240V RESET TEST RESET 120 VOLTS 120/240 VOLTS RESET RESET Control Panel Gas Cap/Fuel Gage PRODUCT IDENTIFICA TION Circuit Breaker 120/240 Volt Receptacle Roll Cage 120 Volt Receptacle (GFCI) Full Power Selector Switch 120 Volt Receptacle Run Lamp Provision for Auto-Idle Switch Gas Tank Starter Grip C ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 7

    7 GENERAL INFORMA TION Master portable generators are rugged and compact. These models provide depend- able, trouble-free service. The alternators are brushless with revolving fields. Honda gasoline engines provide long life under heavy use. Honda engines have overhead valves (OHV). This provides high performance with lower fuel consumption. These ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 8

    8 VENTILA TION DANGER Use only in well-vented areas. Make sure area has plenty of free-moving, fresh, outside air. Never run generator in an enclosed or confined area. Never run generator inside occupied building. Engine exhaust contains poisonous carbon monoxide gas. Overexposure will cause loss of consciousness and will lead to death. This genera ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 9

    9 IMPORTANT: Do not move the full power selector switch while powering electrical items. Unplug all items before moving switch. Failure to do so can damage switch. Model MGH7000 does not have this switch. This model provides full power to all receptacles. 120/240 VOLT Position 120 VOLT ONLY Position Figure 3 - Full Power Selector Switch GENERA TOR ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 10

    10 GROUND FAULT CIRCUIT INTERRUPTER RECEPTACLE All models have a 120-volt ground fault circuit interrupter (GFCI) receptacle. The GFCI receptacle is on the control panel or top cover of alternator (model MGH3000 only). The GFCI protects you against hazardous electrical shock caused when your body becomes a path through which electricity travels to ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 11

    11 RECEPTACLE CIRCUIT BREAKER The circuit breakers protect the receptacles and alternator. Overloading generator will trip circuit breaker. A short circuit in item being powered will also trip breaker. If this occurs, unplug electrical load from receptacle. Let circuit breaker cool down. Push circuit breaker button to reset. Electric motors need hi ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 12

    12 FUEL Continued W ARNING Battery gives off explosive gases. Keep sparks, flames, and cigarettes away. Do not remove or install battery cables when engine is cranking or running. Only service or use battery in a well-vented area. W ARNING Battery contains sulfuric acid. Contact with skin or eyes may cause severe burns. Do not tilt generator with b ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 13

    13 CAUTION If you remove battery, insulate the red, positive (+) battery cable terminal. Insulate with electrical tape. Exposed terminal may spark when generator runs. IMPORTANT: Make sure battery connections are the correct polarity. Electric start generators use negative ground, 12-volt DC starting system. Model MGH7000 has an electric starter. A ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 14

    14 MOUNTING BATTERY TO GENERATOR 1. Secure battery to generator by battery hold-down system. This system consists of the battery mounting bracket, hook bolts, and nut (see Figure 10). 2. Locate the red, positive (+) battery cable from starter solenoid. Connect it to the positive (+) battery terminal (see Figure 11). 3. Locate the black, negative (? ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 15

    15 GENERA T OR GROUNDING W ARNING You must properly earth-ground generator before starting. This will help guard against deadly electric shock. Only use grounded plugs with generator. Only use grounded extension cords. Only use three- wire or double-insulated power tools. Grounding generator helps prevent electric shock from a ground fault conditio ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 16

    16 EXTENSION CORDS Only use grounded extension cords. Be sure to use extension cord with proper wire gauge size. See chart below. Recommended Minimum Wire Gauges (AWG) for Extension Cords Ampere AWG for Length of Cord in Feet Load 50' 100' 150' 21 8 1 8 1 8 31 8 1 8 1 8 41 6 1 6 1 6 51 6 1 6 1 6 61 6 1 6 1 4 81 6 1 4 1 2 10 16 14 12 ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 17

    17 other. For standby service to home or building, only include items you must power. 2. Enter running watts of each item except motors. The light bulb or appliance nameplate lists its wattage. Remember, 1KW = 1000 watts. Note: The name- plate may not list wattage. It may only list volts and amps. The formula for finding wattage is: Volts x Amps = ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 18

    18 120 VOLTS 120/240 VOLTS FULL POWER SELECTOR 120 ONLY 120 240V RESET RESET TEST RESET RESET OPERA TION Figure 13 - Receptacle Locations 120V, 30-Amp Twist-Lock 120V, 15-Amp GFCI Duplex Model MGH3000 has only the 120V, 15-amp GFCI duplex receptacle. 120/240V, 20 or 30-Amp Twist-Lock GENERAL INFORMATION This generator is not large enough to power y ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 19

    19 POWER CORD AND PLUG REQUIREMENTS 120V, 30-amp twist-lock receptacle • NEMA L5-30P plug • Three-wire, 30-amp cord 120/240V, 20 or 30-amp twist-lock receptacle • NEMA L14-20P (20-amp) or L14-30P (30-amp) plug • Four-wire, 20-amp or 30-amp cord W (Neutral) X (Hot) Ground (Green) 120 Volt 30 Amp G W X L5-30P Plug w G YX w G YX 120V 120V Neut ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 20

    20 PRESTART Operate generator on a firm, dry, and clean surface. The surface must be level. Protect generator from heavy dust, sand, dirt, rain, or snow. Do not locate genera- tor near standing water and snow. Make sure area is well-vented. W ARNING Only responsible adults should use generator. Never let anyone operate generator without proper inst ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 21

    21 HONDA OFF ON ST ART ENGINE SW CIRCUIT BREAKER ON/push OFF OPERA TION Continued Figure 16 - Engine Switch In ON Position (All Models Except MGH7000) Continued Figure 17 - Engine Switch (Model MGH7000 Only) 4. Start the engine. A. Recoil Starter Turn engine switch to the ON position (see Figures 16 and 17). Remove slack from starter rope by lightl ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 22

    22 Choke Lever (Open Position) Figure 18 - Choke Lever Opened OPERA TION Continued HIGH ALTITUDE OPERATION This generator will not perform well at high altitudes without proper adjustment. See engine owner’s manual for details. ADDING ELECTRICAL LOADS IMPORTANT: Do not overload generator. Make sure total wattage of all electri- cal loads does not ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 23

    23 STOPPING ENGINE IMPORTANT: The engine speed is preset. The throttle is locked in preset posi- tion. Do not adjust throttle. Follow the steps below to stop engine. 1. Remove all electrical loads from generator (see Disconnecting Electrical Loads, page 22). Remove electrical loads one at a time. 2. Let engine run for two or three minutes after rem ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 24

    24 MAINTENANCE AND REP AIRS W ARNING Only a qualified electrical service person should service and repair the alternator on this generator. Use only factory approved replacement parts. CAUTION The engine speed is preset. The throttle is locked in preset position. Do not adjust throttle. Preset position lets engine run at 3600 RPM under load. The en ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 25

    25 TROUBLE- SHOOTING Note: See engine owner’s manual for engine troubleshooting. W ARNING Only a qualified electrical service person should service and repair generator. Use only factory approved replacement parts. POSSIBLE CAUSE 1. Defective capacitor 2. Winding short circuit or loose connections 3. Defective rotor diode 4. Loss of residual magn ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 26

    26 WIRING DIAGRAMS Figure 22 - Wiring Diagram, Models MGH4000A, MGH5000A, and MGH6000 Circuit Breaker 20A, 25A or 30A 120/240V 20A Receptacle Circuit Breaker 20A, 25A or 30A T4 Full Pwr Selector Switch 120V, 15A Receptacle T2 120V, 30A Receptacle White White Green Black Red Red Black Black Red Black White T3 Black Red Green Red Stator 110/120V T1 T ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 27

    27 WIRING DIAGRAMS Continued 120/240V 30A Receptacle T4 120V, 15A Receptacle Circuit Breaker 20A Green Black Black Black Red Black T3 White Green Red T1 T2 White Circuit Breaker 30A Circuit Breaker 30A Black Red Yellow Green/Yellow Stator 110/120V T1 T2 T3 T4 L2 L1 110/120V 220/240V T2 Green Red Black Yellow Main Windings T1 T3 T4 T1 T2 T3 T4 Rotor ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 28

    28 TECHNICAL SER VICE You may have further questions about installation, operation, or troubleshooting. If so, contact DESA International’s Technical Service Department at 1-800-323- 5190. SER VICING THE ENGINE Honda parts and services should be handled by your nearest authorized engine service firm. Check the yellow pages of your telephone direc ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 29

    29 This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under REPLACEMENT PARTS on page 28 of this manual. ILLUSTRA TED P ARTS LIST For Model MGH3000 Alternator Assembly † Includes fastening hardware. * Part not available by itself. Must purchase Alternator Assembly. 15 27001005S Engine ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 30

    30 This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under REPLACEMENT PARTS on page 28 of this manual. 1 6 2 10 13 3 9 8 4 7 5 11 26 12 16 17 18 14 19 20 15 21 22 9 23 25 24 ILLUSTRA TED P ARTS LIST For Models MGH4000A, MGH5000A, MGH6000, and MGH7000 Alternator Assembly KEY PART NUMBER ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 31

    31 ILLUSTRA TED P ARTS LIST For Model MGH3000 Roll Cage 1 2 3 4 5 3 4 3 4 5 3 4 3 6 6 7 9 9 9 3 7 9 4 5 8 KEY PART NO. NUMBER DESCRIPTION QTY. 1 099781-01 Roll Cage 1 2 099780-02 Engine Spreader 1 3 NEC-5C Lock Nut, 5/16-18 6 4 WP-5C Flat Washer, 5/16" 5 5 26020000 Shock Mount 3 6 04110002 Screw, 5/16-18 x 1 1/2 2 7 14138000 Ground Strap 1 8 2 ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 32

    32 ILLUSTRA TED P ARTS LIST For Models MGH4000A, MGH5000A, MGH6000, and MGH7000 Fuel T ank and Roll Cage 9 10 11 12 13 15 15 15 13 13 17 17 18 11 11 11 16 11 16 21 20 19 16 14 23 14 23 16 16 16 16 14 23 22 FUEL F 1 3 2 4 24 7 8 6 6 7 27 24 26 5 25 ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 33

    33 ILLUSTRA TED P ARTS LIST This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under REPLACEMENT PARTS on page 28 of this manual. KEY PART NO. NUMBER DESCRIPTION QTY. 1 25954000 Gas Cap/Fuel Gage 1 2 099832-01 Gas Tank (with 90 ° fitting) 1 3 25978000 Breather Assembly 1 4 HC4-8C Screw, ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 34

    34 This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under REPLACEMENT PARTS on page 28 of this manual. ILLUSTRA TED P ARTS LIST RESET FULL POWER SELECTOR 120/240 VOLTS RESET RESET 1 2 3 4 5 7 6 6 9 10 11 12 12 120 ONLY 120 240V 120 VOLTS 8 RESET TEST 13 KEY PART NUMBER FOR MODEL NO. MG ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 35

    35 NOTES ...

  • Desa Mgh3000, Mgh4000a, Mgh5000a, Mgh6000, Mgh7000 - page 36

    KEEP THIS WARRANTY W ARRANTY INFORMA TION TWO-YEAR LIMITED WARRANTY GASOLINE PORTABLE GENERATORS DESA International warrants each alternator, generator, or electric product of its manufacture, to be free from defects in material and workmanship for two years from the date of first purchase from an authorized dealer, provided that the product has b ...

Manufacturer Desa Category Portable Generator

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