R PORTABLE GASOLINE GENERATORS OWNER’S OPERATION AND INSTALLATION MANUAL EL FU E F 0V K 12 OC ISTL TW 0V 12 0V 12 I GFC T SE RE ST TE R TE ME UR HO 0V 0/24 CK 12 TLO IS TW 0V 0/24 CK 12 TLO IS TW M EN 05 00 00 1/10 00 HO S UR LE -ID TO AU T SE RE ON T SE RE OFF T SE RE T SE RE Generator Model: MGH8500IE 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.
R PORTABLE GASOLINE GENERATORS SAFETY INFORMATION 1. WARNINGS 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, or carbon monoxide poisoning.
OWNER’S MANUAL SAFETY INFORMATION PRODUCT IDENTIFICATION Continued 9. 14. 115407 F 13. Choke Lever E 12. Gas Cap/Fuel Gauge EL 11. Gas Tank FU 10. Only a qualified electrical service person should service and repair generator. • Generator produces high voltage. Use extreme caution when working on electrical parts. • Always remove spark plug wire from spark plug before servicing. This will prevent accidental starting.
R PORTABLE GASOLINE GENERATORS GENERAL INFORMATION Master portable generators are rugged and compact. These generators use brushless alternators for dependable, trouble-free service. Honda gasoline engines provide long life under heavy use. Honda engines have overhead valves (OHV). This provides high performance with lower fuel consumption. These engines are governed to maintain engine speed of 3600 RPM under load. 3600 RPM engine speed provides 120/240V, 60 Hz power.
OWNER’S MANUAL AUTO-IDLE SYSTEM GENERATOR FEATURES OIL ALERT SYSTEM The oil alert system protects the engine from low oil damage. This system automatically shuts down the engine and prevents engine restarting if the oil level falls too low. Note: When this happens, the engine switch remains in the ON position. The oil alert system is wired into the ON/OFF Switch. If this system shuts down the engine, the engine will not start until you add oil. Add oil to engine (see Engine Oil, page 6).
R PORTABLE GASOLINE GENERATORS GENERATOR FEATURES Continued 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 higher starting current. They require up to three-times their rated wattage to start.
OWNER’S MANUAL BATTERY CAUTION: Do not over tighten positive terminal on starter solenoid. Positive terminal could rotate and cut into negative terminal, causing a short. Continued WARNING: Battery contains sulfuric acid. 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. • If battery acid gets on your skin, wash with water.
R PORTABLE GASOLINE GENERATORS GENERATOR GROUNDING WARNING: 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. You must supply the ground wire and grounding point. These do not come with generator. Follow the National Electrical Code and all state and local codes. Consult your power company or a licensed electrician.
OWNER’S MANUAL DETERMINING ELECTRICAL LOAD FOR GENERATOR You must decide what electrical load your generator can power. Do this before using generator. Use the following four-step method. It will help you select a load that is not too large. Make sure total wattage of all electrical loads does not exceed rated wattage of generator. For rated wattage of your generator, see Specifications, page 4. Electric motors present a special problem when figuring load. Read Step 3 carefully. 1.
R PORTABLE GASOLINE GENERATORS OPERATION USING RECEPTACLE GENERAL INFORMATION Note: Do not exceed amperage rating of receptacles. Exceeding rating will trip receptacle circuit breaker. This generator is not large enough to power your entire home. Do not connect generator to any existing electrical circuits. Plug items directly into generator receptacles. Do not exceed amperage rating of receptacles. Only use grounded cords. DANGER: Use only in wellvented areas.
OWNER’S MANUAL 3. OPERATION Continued 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 generator near standing water and snow. Make sure area is well-vented. WARNING: Only responsible adults should use generator. Never let anyone operate generator without proper instructions. Note: If oil level is too low, oil alert system will keep engine from starting (see Oil Alert System, page 5).
R PORTABLE GASOLINE GENERATORS OPERATION 4. Continued Adjusting the Idle Speed IMPORTANT: Adjust the idle speed only: • If the idle speed becomes too high. • If the engine idle speed will not regulate (engine wants to “hunt” or speeds up and slows down repeatedly). 1. Turn Auto-Idle switch OFF. Start engine. Allow engine to warm up with no load for five minutes. 5. Turn Auto-Idle switch ON. Make sure solenoid is engaged. When engaged, the punger is pulled back into the solenoid.
OWNER’S MANUAL OPERATION MAINTENANCE AND REPAIRS Continued STOPPING ENGINE IMPORTANT: The engine speed is preset. The throttle is locked in preset position. Do not adjust throttle. Follow the steps below to stop engine. 1. Remove all electrical loads from generator (see Disconnecting Electrical Loads, page 12). Remove electrical loads one at a time. 2. Let engine run for two or three minutes after removing electrical loads. This lets engine cool slightly. 3.
R PORTABLE GASOLINE GENERATORS SERVICING THE ENGINE Honda parts and services should be handled by your nearest authorized engine service firm. Check the yellow pages of your telephone directory under the listing: Engines Gasoline, Honda or visit: www.honda-engines.com or call Honda direct: 1-800-426-7701 TECHNICAL SERVICE You may have further questions about assembling, operating, or maintaining this product. If so, you can visit our Technical Service web site at www.desatech.
OWNER’S MANUAL ELECTRICAL COMPONENT SPECIFICATIONS Model MGH8500IE Resistance in Ohms Stator Stator Rotor Main Auxiliary Primary Winding * Winding ‡ Winding † 0.431 .0962 7.782 * Connect T2 (green) and T3 (black). Measure resistance between T1 (red) and T4 (blue). ‡ Resistance between brown and white leads. † Remove diodes to check resistance.
R PORTABLE GASOLINE GENERATORS WIRING DIAGRAM Stator T1 T2 T3 T4 220/240V L1 110/120V Black Red L2 White 110/120V 120V, 30A Receptacle Stator Brown 120V, 20A Receptacle 120V, 15A Receptacle Duplex GFCI Red White Capacitor White Diode Green/Yellow Red White Wht T4 Blue Red Black T3 Red T1 Green/ Yellow Green T4 T3 120/240V 20A/30A Receptacle T2 Blk Green White Blk Green/ Yellow Auto-Idle Wht T2 Red Green Red Blk Circuit Breaker 45A Circuit Breaker 45A Circuit Br
OWNER’S MANUAL ILLUSTRATED PARTS LIST 1 2 Alternator Assembly This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual. 3 4 5 6 7 12 11 9 10 13 15 16 17 14 KEY PART NO.
R PORTABLE GASOLINE GENERATORS ILLUSTRATED PARTS LIST Fuel Tank and Roll Cage 9 1 EL FU 0V 12 OCK L IST TW E F 0V 12 0V 12 CI GF 3 T SE RE ST TE 4 17 R TE ME UR HO 0V 0/24 CK 12 TLO IS TW 0V 0/24 CK 12 TLO IS TW M EN 05 00 00 1/10 00 SA FE TY INF OR MA TIO N S UR HO LE -ID TO AU T SE RE ON Unl eade d T SE RE F OF 2 T SE RE T SE RE Gas olin eO nly 7 6 5 14 15 16 14 15 13 14 8 16 11 12 11 10 12 15 14 18 115407
OWNER’S MANUAL ILLUSTRATED PARTS LIST Fuel Tank and Roll Cage This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual. KEY NO.
R PORTABLE GASOLINE GENERATORS ILLUSTRATED PARTS LIST Solenoid and Control Board Assemblies and Mounting 2 3 5 4 6 7 Solenoid Assembly and Mounting T1 DESA 1 Control Board Assembly and Mounting 20 115407
OWNER’S MANUAL ILLUSTRATED PARTS LIST Solenoid and Control Board Assemblies and Mounting This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual. KEY NO.
R PORTABLE GASOLINE GENERATORS ILLUSTRATED PARTS LIST 5 4 Control Panel 3 RE SE TE T ST This list contains replaceable parts used in your generator. When ordering parts, follow the instructions listed under Replacement Parts on page 23 of this manual. 10 14 6 1 11 T1 DESA 12 0 GF V CI 12 0V TW 120 IST V LO CK 9 2 7 2 HO UR ME TE R E 00 NM 00 00 HO 05 U RS 1/10 AU TO -ID LE 1 TW20/2 IST 40V LO CK 8 1 TW20/2 IST 40V LO CK OF F ON 7 13 RE SE T RE SE T RE SE T RE SE T 12 KEY NO.
OWNER’S MANUAL REPLACEMENT PARTS AND ACCESSORIES For original replacement parts and accessories, contact your nearest Authorized Dealer or Authorized Service Center for this product. If they can not supply the part or accessory, contact your nearest Parts Central listed below. Each Authorized Dealer, Authorized Service Center, and Parts Central is independently owned and operated. See pages 17 through 22 for an Illustrated Parts List.
WARRANTY INFORMATION KEEP THIS WARRANTY Model Serial No. Date Purchased Always specify model and serial numbers when communicating with the factory. We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty. We make no other warranty, expressed or implied.
