Generac Power Systems MGG155, MGG210 Operating Manual
GASEOUS GENERATOR
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MGG155 • MGG210
OPERATING MANUAL
00620
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35319 C 05/16
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WARNING
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CALIFORNIA PROPOSITION 65 WARNING: Engine exhaust and some of its constituents
are known to the state of California to cause cancer, birth defects, and other reproduc-
tive harm. (000004)
WARNING
CALIFORNIA PROPOSITION 65 WARNING: This product contains or emits chemicals
known to the state of California to cause cancer, birth defects, and other reproductive
harm. (000005)
WARNING
ENVIRONMENTAL HAZARD: Always recycle batteries at an official recycling center in
accordance with all local law and regulations. Failure to do so could result in environ-
mental damage, death or serious injury. (000228)
ii
Introduction
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This manual provides information and procedures to safely operate and maintain the Generac Mobile Products unit.
For your own safety and protection from physical injury, carefully read, understand, and observe the safety instructions
described in this manual. Keep a copy of this manual with the unit at all times. Additional copies are available from
Generac Mobile Products. The information contained in this manual was based on machines in production at the
time of publication. Generac Mobile Products reserves the right to change any portion of this information without
notice.
Read all of the manuals included with the unit. Each manual details specific information regarding items such as
setup, use and service requirements. An engine operator’s manual provides detailed operation and maintenance
procedures for the engine. Additional copies of the engine operator’s manual are available from the engine
manufacturer.
DO NOT MODIFY or use this equipment for any application other than for which it was designed.
Only a trained and licensed electrician should perform wiring and connections to unit. Wiring must be in compliance
with National Electrical Code (NEC), state and local regulations, and Occupational Safety and Health Administration
(OSHA) guidelines.
Engine Make:__________________________________________
Engine Serial Number:___________________________________
Engine Model Number: __________________________________
Generator Make: _______________________________________
Generator Model Number: ________________________________
Generator Serial Number: ________________________________
Unit Model Number:_____________________________________
Unit Serial Number: _____________________________________
Dealer Name:__________________________________________
Dealer Phone Number: __________________________________
iii
Table of Contents
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Section 1 - Safety
Safety Notes ....................................................................................................................................... 1
Operating Safety................................................................................................................................. 1
Engine Safety ..................................................................................................................................... 2
Service Safety .................................................................................................................................... 2
Towing Safety.....................................................................................................................................3
Reporting Trailer Safety Defects ........................................................................................................ 3
Section 2 - General Information
Specifications ..................................................................................................................................... 5
Unit Dimensions .................................................................................................................... 6
Engine Oil Recommendations ............................................................................................... 6
Coolant Recommendation ..................................................................................................... 7
Unit Serial Number Locations.............................................................................................................7
Component Locations......................................................................................................................... 8
Unit Set Up ....................................................................................................................................... 14
Well Site Approval ............................................................................................................... 14
Fuel Connections................................................................................................................. 14
LP Liquid Connections (Liquid Withdrawal System)............................................................ 17
Valve and Fitting Pipe Equivalents ...................................................................................... 19
Electrical Connections ......................................................................................................... 19
Dual Fuel System ............................................................................................................................. 20
Natural Gas (Well Gas) Fuel System .................................................................................. 20
LP Liquid Withdrawal Fuel System...................................................................................... 20
DC Fuses.......................................................................................................................................... 20
Generator and Load Compatibility....................................................................................................20
Engine/Generator Protective Devices .............................................................................................. 21
Digital Controller ............................................................................................................................... 21
Setting the Clock ................................................................................................................. 22
Section 3 - Operation
Prestart Checklist ............................................................................................................................. 23
Manually Starting the Unit ................................................................................................................ 23
Natural Gas (Well Gas) Start Up .........................................................................................23
LP Liquid Start Up ............................................................................................................... 24
Auto (Remote) Starting the Unit ....................................................................................................... 24
Parallel Setup and Operation ........................................................................................................... 24
Operation Checks.............................................................................................................................25
Overcrank Shutdown ........................................................................................................................ 25
Derating for Altitude..........................................................................................................................26
Generator Output Connections......................................................................................................... 26
Customer Convenience Receptacles ............................................................................................... 27
Main Circuit Breaker ......................................................................................................................... 28
Frame Ground Connection .................................................................................................. 28
Battery Disconnect Switch................................................................................................... 28
Shutting Down the Unit.....................................................................................................................28
Emergency Stop Switch ................................................................................................................... 29
Towing the Trailer.............................................................................................................................29
Section 4 - Maintenance
Emissions ......................................................................................................................................... 31
Maintenance Tasks .......................................................................................................................... 31
Daily Walk Around Inspection.............................................................................................. 31
Check Fuel System ............................................................................................................. 31
Check Engine Fluids............................................................................................................ 31
Changing the Oil.................................................................................................................. 32
v
Adding Coolant .................................................................................................................... 33
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Integrated Electronic Pressure Regulator (IEPR) Maintenance and Inspection.................. 33
Checking/Draining Oil Build-Up in the Vaporizer Regulator ................................................34
Maintenance Schedule ..................................................................................................................... 34
Battery Inspection................................................................................................................ 36
Battery Replacement ........................................................................................................... 37
Other Maintenance Checks ................................................................................................. 38
Jack Maintenance............................................................................................................................. 39
Side-Wind Models ............................................................................................................... 39
Top-Wind Models ................................................................................................................ 39
Trailer Wheel Bearings ..................................................................................................................... 39
Section 5 - Troubleshooting
Problems and Solutions....................................................................................................... 41
Section 6 - Wiring Diagrams
AC Wiring - MGG155 (120V GCB) ...................................................................................................53
AC Wiring - MGG210 (120V GCB) ...................................................................................................54
AC Wiring - MGG155 (24V GCB) ..................................................................................................... 55
AC Wiring - MGG210 (24V GCB) ..................................................................................................... 56
DC Wiring - MGG155 (120V GCB)...................................................................................................57
DC Wiring - MGG210 (120V GCB)...................................................................................................58
DC Wiring - MGG155 (24V GCB).....................................................................................................59
DC Wiring - MGG210 (24V GCB).....................................................................................................60
CAN Parallel Communication Connection - MGG155 and MGG210 ............................................... 61
vi
SAFETY NOTES
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This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury or death.
This manual contains DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES which must be
followed to prevent the possibility of improper service, damage to the equipment, personal injury or death.
The following formatting options will apply when calling the readers attention to the DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES.
INDICATES A HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, WILL RESULT IN
Indicates a hazardous situation which, if not avoided, could result in death or serious
Indicates a hazardous situation which, if not avoided, could result in minor or moderate
Section 1 - Safety
DANGER
DEATH OR SERIOUS INJURY. (000001)
WARNING
injury. (000002)
CAUTION
injury. (000003)
Indicates a hazardous situation which, if not avoided, could result in property or equipment
damage.
Note: Notes contain additional information important to a procedure and will be found within the regular text body
of this manual.
OPERATING SAFETY
Before using the unit, be sure you read and understand all of the instructions. This equipment was
designed for specific applications; DO NOT modify or use this equipment for any application other than
which it was designed for. Equipment operated improperly or by untrained personnel can be dangerous.
Read the operating instructions and familiarize yourself with the location and proper use of all instruments
and controls. Inexperienced operators should receive instruction from someone familiar with the equipment
before being allowed to operate or set up the unit. The following points should be practiced at all times:
• The area immediately surrounding the unit should be dry, clean, and free of debris.
• Position and operate the unit on a firm, level surface.
• DO NOT start a unit in need of repair.
• If the unit is equipped with a frame grounding stud, follow any local, state, and National Electrical
Code (NEC) guidelines when connecting.
• DO NOT operate the unit on a combustible surface.
• DO NOT operate a unit while tired, distracted, or under the influence of drugs or alcohol.
• Keep all body parts, clothing and other loose items away from moving parts.
• All fuel types are potentially FLAMMABLE and/or EXPLOSIVE and should be handled with care.
Comply with all laws regulating the storage and handling of fuels. Inspect the unit’s fuel system
frequently and correct any leaks immediately. Fuel supply lines must be properly installed, purged,
and leak tested according to applicable fuel-gas codes before placing the equipment into service.
35319 C MGG155/210 Operating Manual 1
Safety
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• DO NOT smoke around the unit.
• Shut the engine down if any of the following conditions exist during operation:
1. Noticeable change in engine speed.
2. Loss of electrical output.
3. Equipment connected to the unit overheats.
4. Sparking occurs.
5. Engine misfires or there is excessive engine/generator vibration.
6. Protective covers are loose or missing.
7. If the ambient air temperature is above 120°F (49°C).
ENGINE SAFETY
Internal combustion engines present special hazards during operation and fueling. Failure to follow the
safety guidelines described below could result in severe injury or death. Read and follow all safety warnings
described in the engine operator's manual. A copy of this manual was supplied with the unit when it was
shipped from the factory.
• DO NOT run engine indoors or in an area with poor ventilation unless exhaust hoses are used. Engine
exhaust contains carbon monoxide, a deadly, odorless and colorless gas which, if inhaled, can cause
nausea, fainting or death. Verify engine exhaust cannot seep into closed rooms or ventilation
equipment.
• DO NOT touch or lean against hot exhaust pipes or engine components.
• DO NOT clean air filter with gasoline or other types of low flash point solvents.
• DO NOT operate the unit without a functional exhaust system.
• Prolonged exposure to sound levels in excess of 85 dB(A) can cause permanent hearing loss. Wear
hearing protection when working around a running engine.
• Batteries contain sulfuric acid which can cause severe injury or death. Sulfuric acid can cause eye
damage, burn flesh or eat holes in clothing. Protective eye wear and clothing are necessary when
working on or around the battery. Always disconnect the negative (-) battery cable from the
corresponding terminal before performing any service on the engine or other components.
• DO NOT remove the radiator cap while the engine is hot.
• Keep area around exhaust pipes and air ducts free of debris to reduce the chance of an accidental fire.
SERVICE SAFETY
All service work must be performed by qualified personnel who are familiar with the equipment. Only a
qualified electrician should troubleshoot or repair electrical problems occurring in this equipment. Follow the safety guidelines described below to prevent hazardous situations which could result in severe
injury or death.
• DO NOT wash the unit with high pressure hoses, power washers, or steam cleaners. Water may
collect in the unit, causing damage to electrical parts.
• ALWAYS use extreme caution when servicing this unit in damp conditions. Do not service the unit if
your skin or clothing is wet. Do not allow water to collect around the base of the unit.
• Replace all missing and hard to read decals. Decals provide important operating instructions and
warn of dangers and hazards.
• ALWAYS turn the battery disconnect switch to the OFF position before performing any service on the
engine, generator, or any other components. Remove the negative (-) battery cable from the
corresponding terminal if the unit is to be stored or transported.
2 MGG155/210 Operating Manual 35319 C
• DO NOT start the unit under load. The main circuit breaker must be in the open position (press the
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right I/O button on the controller) when starting the unit.
TOWING SAFETY
Towing a trailer requires care. Both the trailer and vehicle must be in good condition and securely fastened
to each other to reduce the possibility of an accident. Some states require that large trailers be registered
and licensed. Contact your local Department of Transportation office to check on license requirements for
your particular unit.
• Verify the hitch and coupling on the towing vehicle are rated equal to, or greater than, the trailer's
Gross Vehicle Weight Rating (GVWR).
• Check trailer tires for wear and proper inflation.
• DO NOT tow trailer using defective parts. Inspect the hitch and coupling for wear or damage.
• Verify the trailer hitch and the coupling are compatible and the coupling is securely fastened to the
vehicle.
• Verify the directional and brake lights on the trailer are connected and working properly.
• See Towing the Trailer. Verify wheel lug nuts are present and tightened to the specified torque.
• Maximum recommended speed for highway towing is 45 mph (72 km/h). Recommended off-road
towing speed is 10 mph (16 km/h).
Safety
• When towing, maintain extra space between vehicles and avoid soft shoulders, curbs and sudden
lane changes. Practice turning, stopping and backing up in an area away from heavy traffic prior to
transporting unit.
• Wipe the coupler clean and apply fresh grease each time the trailer is towed to eliminate squeaking.
• Connect safety chains in a crossing pattern under the tongue and ATTACH THE BREAKAWAY
CABLE TO THE REAR BUMPER OF THE TOWING VEHICLE. Do not attach the cable to the trailer
hitch.
• The trailer is equipped with hydraulic or electric surge brakes. Verify proper operation of the brakes
by braking the vehicle at a slow speed before entering traffic. Both the trailer and the vehicle should
brake smoothly. If the trailer seems to be pushing, check the level in the brake fluid reservoir, if
equipped.
REPORTING TRAILER SAFETY DEFECTS
If you believe your trailer has a defect which could cause a crash or could cause injury or death, you should immediately
inform the National Highway Traffic Safety Administration (NHTSA) in addition to notifying Generac Mobile Products
LLC.
If NHTSA receives similar complaints, it may open an investigation; and if it finds that a safety defect exists in a group
of vehicles, it may order a recall and remedy campaign. However, NHTSA cannot become involved in an individual
problem between you, your Independent Authorized Service Dealer, or Generac Mobile Products LLC.
To contact NHTSA, you may either call the Auto Safety Hotline toll-free at 1-888-327-4236 (TTY:1-800-424-9153),
go to http://www.safercar.gov; or write to:
Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590
You can also obtain other information about motor vehicle safety from http://www.safercar.gov.
35319 C MGG155/210 Operating Manual 3
Safety
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SAFETY SYMBOL SUMMARY
The safety and operating decals affixed to the unit provide important instructions and warn of dangers and hazards.
Replace any missing or hard-to-read decals and use care when washing or cleaning the unit. Decal placement and
part numbers can be found in the online parts manual at www.generacmobileproducts.com. Below is a summary of
the intended meanings for the symbols used on the decals.
Safety alert symbol; used to alert
you to potential personal
injury hazards.
No open flames.
Unit electrical ground.
Wear protective gloves.
Explosion hazard.
Fire hazard.
Burn/scald hazard;
pressurized steam.
Hot surface(s) nearby.
Dangerous voltage may be
present.
Use protective eyewear.
Lift here only.
Read and understand the
supplied operator’s manual
before operating unit.
Belt/entanglement hazard; keep
body parts clear of this area.
Fan hazard; keep body parts
clear of this area.
Engine starting/remote starting point.
Engine can start automatically.
4 MGG155/210 Operating Manual 35319 C
Anchor/tie down point.
00844
Section 2 - General Information
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SPECIFICATIONS
GENERAC MODEL MGG155 MGG210
Engine
Make/Brand............................................................................. PSI ..........................................PSI
Model ......................................................................................D081TIC..................................D111TIC
Induction System ....................................................................Turbo CAC ..............................Turbo CAC
Horsepower - Prime - Natural Gas hp (kW) ..........................239 (178) ................................. 302 (225)
Horsepower - Standby - LP Liquid hp (kW) ...........................200 (149) .................................272 (203)
Operating Speed rpm .............................................................1800 ........................................ 1800
Displacement in
Cylinders - qty .........................................................................6 .............................................. 6
Spark plug gap in (mm)..........................................................0.015 (.4) .................................0.015 (.4)
Fuel Consumption (NG) - 100% load ft
Fuel Consumption (NG) - 75% load ft
Fuel Consumption (NG) - 50% load ft
Fuel Consumption (LP) - 100% load gal/hr (L/hr)..................15.4 (58.3) ...............................19.2 (72.7)
Fuel Consumption (LP) - 75% load gal/hr (L/hr)....................11.8 (44.7) ...............................14.7 (55.6)
Fuel Consumption (LP) - 50% load gal/hr (L/hr)....................8.3 (31.4) .................................10.2 (38.6)
Battery Type - Group Number .................................................8D............................................8D
Battery Voltage (quantity per unit)...........................................12V (2) .................................... 12V (2)
Battery Voltage (series connection) ........................................24V..........................................24V
Battery Rating .........................................................................1100CCA................................. 1100CCA
3
(L) ..............................................................494 (8.1) ..................................673 (11.0)
3
/hr (m3/hr) ..............1092 (30.9) .............................. 1431 (40.5)
3
/hr (m3/hr) ................858 (24.3) ................................ 1112 (31.5)
3
/hr (m3/hr) ................625 (17.7) ................................ 794 (22.5)
Generator
Make/Brand............................................................................. Stamford..................................Stamford
Model ......................................................................................UCI274E-311...........................UCI274G-311
Type, Insulation....................................................................... Brushless, H............................Brushless, H
See the data plate on the generator for rated watts, amperes, frequency, voltage, phase and other important information.
Generator Set (Engine/Generator)
3Ø - Continuous - Natural Gas kW (kVA) ..............................100 (125) ................................. 137 (171)
3Ø - Standby - LP Liquid kW (kVA) ........................................ 108 (135).................................139 (173)
Amps - 3Ø Continuous - Natural Gas (480V/277) A ...............150 .........................................206
Amps - 3Ø Standby - Natural Gas (480V/277) A ....................214 .........................................278
Amps - 3Ø Standby - LP Liquid (480V/277) A .......................162 .......................................... 209
Frequency Hz .........................................................................60 ............................................ 60
Power Factor........................................................................... 0.8 ..........................................0.8
AC Distribution
Circuit Breaker Size A............................................................. 200 ..........................................400
Voltage Regulation..................................................................Digital ......................................Digital
Voltages Available 3Ø .............................................................480 (277/480)..........................480 (277/480)
Capacities
Coolant (incl. engine) qt (L) ...................................................20 (18.9)..................................22 (20.8)
Oil (incl. filter) qt (L) ...............................................................7.2 (6.81).................................7.6 (7.19)
Weights
Operating Weight, Skid Mounted lbs (kg) .............................7245 (3286).............................7290 (3307)
Operating Weight, Trailer Mounted lbs (kg) ..........................9645 (4375) .............................9890 (4486)
Trailer
Number of Axles......................................................................2 ..............................................2
Capacity - Axle Rating lbs (kg) ............................................... 7000 (3175).............................7000 (3175)
Tire Size in .............................................................................16 ............................................ 16
Brakes - Standard ...................................................................Electric ....................................Electric
Hitch - Standard ......................................................................3" lunette ring ..........................3" lunette ring
Maximum Tire Pressure psi ...................................................80 ............................................80
Specifications are subject to change without notice.
35319 C MGG155/210 Operating Manual 5
General Information
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Unit Dimensions
B
A
B
A
Figure 1 - Unit Dimensions
ABC
MGG155 - Skid Mounted 66 in. (1.67 m) 92 in. (2.33 m) 169 in. (4.29 m)
C
C
02020
MGG155 - Trailer Mounted 102 in. (2.59 m) 124 in. (3.15 m) 269 in. (6.83 m)
MGG210 - Skid Mounted 66 in. (1.67 m) 92 in. (2.33 m) 201 in. (5.10 m)
MGG210 - Trailer Mounted 102 in. (2.59 m) 124 in. (3.15 m) 269 in. (6.83 m)
Specifications are subject to change without notice.
Engine Oil Recommendations
To maintain the product warranty, the engine oil should be serviced in accordance with the recommendations of this
manual. For your convenience, Generac Maintenance Kits are available that include engine oil, oil filter, air filter,
spark plug(s), a shop towel and funnel. These kits can be obtained from an Independent Authorized Service Dealer
(IASD).
The engine has been filled with factory engine oil of a grade recommended by the engine supplier. The manufacturer
recommends an initial oil and filter change after the first 50 hours (or first three months) of service operation. Use a
high quality detergent oil with an appropriate classification and viscosity for the engine type and ambient temperature
conditions. See Specifications for oil capacity.
6 MGG155/210 Operating Manual 35319 C
General Information
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• SAE 15W-40 low ash
• API CD/CF or higher
Coolant Recommendation
See the OEM engine manual for coolant type. Normally a 50/50 mix of coolant and water is required. Coolant system
capacity is listed in Specifications.
DANGER
RISK OF POISONING. DO NOT USE MOUTH TO SIPHON COOLANT. DOING SO WILL
RESULT IN DEATH OR SERIOUS INJURY. (000149)
WARNING
DO NOT open coolant system until engine has completely cooled. Doing so could
result in serious injury. (000154)
CAUTION
Do not use any chromate base rust inhibitor with propylene glycol base antifreeze, boosters
or additives. Doing so will cause overheating. (000165)
UNIT SERIAL NUMBER LOCATIONS
See Figure 2 to locate the unit ID tag and Vehicle Identification Number (VIN) tag on the unit. Important information,
such as the unit serial number, model number, VIN and tire loading information are found on these tags. Record the
information from these tags so it is available if the tags are lost or damaged. When ordering parts or requesting
assistance, you may be asked to provide this information.
UNIT ID Tag
Manufactured by Generac Mobile Products LLC,
a subsidiary of Generac Power Systems, Inc.
(920) 361-4442 (800) 926-9768
Country of Origin
Manufacturing Code
1 ph. 1.0PF 3 ph. .8PF 3 ph. 1.0PF
KW
KVA
V
A
Model
Weight (lbs/kg) RPM/Frequency
Located on control panel
(behind door)
Serial Number
Rating
FOR ELECTRICAL EQUIPMENT
Ins. Class
ONLY. POUR MATERIAL
ELECTRIQUE SEULEMENT.
209649
Form: SFC626B
VIN Tag
MANUFACTUREDBY/FABRIQUE PAR: Generac Mobile Products LLC DATE: 00/0000
GVWR/PNBV: 000KG (0000LBS) COLDINF. PRESS./
PRESS.DE
GAWR / PNBE TIRE / PNEU RIM / JANTE GONF A FROID - KPA(PSI/LPC) SGL / DUAL
EACH
AXLE
THIS VEHICLE CONFORMS TOALLAPPLICABLE STANDARDS PRESCRIBED UNDER THE U.S. FEDERAL MOTOR VEHICLE SAFETY STANDARDS(FMVSS)AND CANADIAN
MOTOR VEHICLE SAFETY REGULATIONS IN EFFECT ONTHE DATE OF MANUFACTURE.
CE VEHICULE EST CONFORMEATOUTES LES NORMES QUI LUI SONT APPLICABLES EN VERTU DU REGLEMENT SUR LA SECURITE DES VEHICULESAUTOMOBILES DU CANADA EN VIGUEUR A LA DATE SA
FABRICATION.
00000000000000000
V.I.N./N.I.V.:
XXX000
MODEL:
TYPE: TRAILER
TIRE AND LOADING INFORMATION
RENSEIGNEMENTS SUR LES
The weight of cargo should never exceed 0000KG (0000LBS)
Le poids du chargement ne doit jamais depasser 0000KG (0000LBS)
PNEUS ET LE CHARGEMENT
RENSEIGNEMENTS
SEE OWNER’S
MANUAL FOR
ADDITIONAL
INFORMATION
VOIR LE
MANUEL DE
L’USAGER
POUR
PLUS DE
02063
Figure 2 - Serial Number Locations
35319 C MGG155/210 Operating Manual 7
General Information
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COMPONENT LOCATIONS
2
1
7
8
9
Figure 3 - MGG155 - Left Side
1. Catalyst exhaust muffler 6. Dipstick
2. Air filter 7. Alternator
3. Battery disconnect switch 8. Coolant drain
4. Starter 9. Oil reservoir
5.
12 volt batteries (2)
3
4
5
6
02032
8 MGG155/210 Operating Manual 35319 C
General Information
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2
1
6
7
8
9
10
Figure 4 - MGG210 - Left Side
1. Catalyst exhaust muffler 6. Dipstick
2. Air filter 7. Alternator
3. Battery disconnect switch 8. Engine heater (optional)
4. Starter motor 9. Coolant drain
5. 12 volt batteries (2) 10. Oil reservoir
3
4
5
02033
35319 C MGG155/210 Operating Manual 9
General Information
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2
1
5
6
7
13
12
11
10
Figure 5 - MGG155 and MGG210 - Right Side (MGG155 Shown)
1. Oil fill cap 8. Customer connection box
2. Silencer 9. Generator output connections
3. LP (liquid) inlet 10. Emergency stop switch
4. Natural gas (well gas) inlet 11. Main circuit breaker
5. Oil level controller 12. Control panel (see Figure 7)
6. Oil drain 13. Manual holder
7.
Customer convenience receptacles
8
9
3
4
02034
10 MGG155/210 Operating Manual 35319 C
General Information
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3
1
2
654
7
8
16
15
Figure 6 - Fuel System (MGG155 Shown)
1. Air filter 9. LP liquid inlet
2. Electronic throttle control 10. Natural gas (well gas) inlet
3. Integrated electronic pressure regulator 11. Manual ball valve (natural gas)
4. Natural gas lock-off 12. Strainer access
5. LP liquid lock-off 13. Pressure gauge (psi)
6. Vaporizer 14. Pressure regulator
7. Pressure switch 15. Access for regulator adjustment
8. Pressure gauge (inch WC) 16. Fuel/air mixer
14
13
12
11
10
9
00720
35319 C MGG155/210 Operating Manual 11
General Information
EMERGENCY STOP
VOLTAGE
ADJUST
OFF
ON
PANEL
LIGHTS
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CONTROL PANEL
1
2
3
4
5
DC CIRCUIT
BREAKER
6
CONTROLLER
PANEL
LIGHT FUSE
FUSE
10
2
EMERGENCY STOP
VOLTAGE
ADJUST
ON
OFF
PANEL
LIGHTS
7
8
9
00578
Figure 7 - MGG155 and MGG210 Control Panel
1. Alarm horn 6. Digital controller
2. Panel light 7. Emergency stop switch (not on all units)
3. Panel light fuse (10A) 8. Voltage adjustment
4. Controller fuse (5A) 9. Panel lights switch
5. DC circuit breaker 10. Main circuit breaker
12 MGG155/210 Operating Manual 35319 C
ELECTRICAL PANEL
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General Information
FUEL SELECT SWITCH
AUTO
NG
LP
TB1
1" X 2" WIREWAY
8
TB2
1
7
2
6
SR
5
4
3
FR
STR
CBCR
CBOR
iG-AVRi
iG-AVRi
TRANS/LV
5A FUSE
F3
TB3
02031
Figure 8 - Electrical Panel (Located Behind Control Panel Door)
1. Fuel select switch 5. Shunt trip relay
2. Terminal block (3) 6. Fuel relay
3. Circuit breaker open relay 7. Starter relay
4. Circuit breaker closed relay 8. Relay protection fuse (5A)
35319 C MGG155/210 Operating Manual 13
General Information
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UNIT SET UP
This unit is designed to operate with natural gas or well gas as the primary fuel and LP liquid as the secondary fuel.
For units operating on well site gas, a well test must be performed prior to installation of the unit.
Well Site Approval
A well gas chromatography analysis must be performed prior to installation of the unit. A copy of the test report must
be sent to, and preapproved by, Generac Power Systems. If the unit is moved to a new location, a new well test
must be performed. For more information, contact Generac Mobile Products Technical Support.
The unit should be installed, serviced, tested, adjusted, and otherwise prepared for use by an Independent Authorized
Service Dealer. The owner is responsible for ensuring the unit emission control system meets all applicable state
and local regulations.
WARNING
Risk of Fire. Unit must be positioned in a manner that prevents combustible material
accumulation underneath. Failure to do so could result in death or serious injury.
(000147)
Fuel Connections
Almost all operation problems are related to the installation techniques used. DO NOT guess, be sure pipe size is
adequate for required flow rate. See Table 1, Table 2 and Table 3.
Natural Gas Connections
Follow the steps below:
1. Before connecting the natural gas fuel line to the unit, apply pipe sealant to the NPT threads of the fitting at
the end of the fuel line.
Note: Do not apply pipe sealant to the flared (flanged) end of the fitting.
2. Connect the fuel line to the two inch inlet, located on the right side of the unit’s frame.
3. Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas
connections comply with all building codes.
4. Verify fuel supply pressure is adequate.
Purging the Natural Gas Fuel Line
After initial setup, it may be necessary to purge the natural gas fuel line before operating the unit. LP liquid must be
available as a secondary fuel to perform this procedure.
1. Open the control door located at the back of the unit.
2. Remove the three screws securing the left control panel door. A Fuel Select switch is located behind the
door. See Figure 8.
3. Move the Fuel Select switch to the LP or AUTO position.
14 MGG155/210 Operating Manual 35319 C
General Information
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FUEL SELECT SWITCH
AUTO
NG
LP
00651
Figure 9 - Fuel Select Switch
4. Apply pipe sealant to the NPT threads of the pipe fitting at the end of the natural gas fuel line. Connect the
fuel line to the two inch inlet located on the right side of the unit’s frame.
Note: Do not apply pipe sealant to the flared (flanged) end of the fuel pipe.
5. Apply pipe sealant to the NPT threads of the pipe fitting at the end of the LP liquid fuel line. Connect the fuel
line to the 1/2 inch inlet located on the right side of the unit’s frame.
6. Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas
connections comply with all building codes.
7. Verify fuel supply pressure is adequate.
Formula Example:
If a unit has a 160 hp engine 60 feet from the supply, the engine needs 10,000 BTU/hr per hp to run efficiently. For
natural gas fuel, there are 1015 BTU/ft3. From Table 1, a 60 foot run requires a minimum 1 inch pipe at full engine load.
160 hp x 10,000 BTU/Hr per hp = 1,600,000 BTU’s / per hour for proper operation
1,600,000
1, 015
Note: The incoming pressure must be approximately 20 psi to unit.
= 1576 cubic feet per hour
35319 C MGG155/210 Operating Manual 15
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