INSTALLATION MANUAL - Northern Lights generatoren
Contents
1. INSTALLATION MANUAL A CALIFORNIA Proposition 65 Warning Diesel engine exhaust and some of its constitu ents are known to the State of California to cause cancer birth defects and other reproductive harm Northern Lights 4420 14th Avenue N W Seattle WA 98107 206 789 3880 Fax 206 782 5455 Copyright 2008 Northern Lights Inc All rights reserved Northern Lights and the Northern Lights logo are trademarks of Northern Lights Inc Printed in U S A PART NO IM1000 04 08 INORTHERN LIGHTS NORTHERN LIGHTS Table of Contents INTRODUCTION ies UNIT IDENTIFICATION Model Desisnati de da A Serial WARRANTY a iia SAFETY RULES aan a DO S amp DONT Siria MODEL SELECTION cantada riada nr an Deren aaa een Estimating Electrical Load 00 Circuit Breakers gga teases Balancing Loads an a Hk neither Motor Lords MOUNTING lien kann EXHAUST SYSTEM su nun a A A A Wet EXIST Water2. 10 Exhaust System If the exhaust manifold is significantly below the water line causing a rise of greater than 4 feet 1 23 m an insulated dry stack arrangement can be used to raise the waterlift muffler above the exhaust manifold see Figure 4 The uncooled portion of the exhaust piping must be insulated The distance from the top of the loop to the thru hull fitting should be a drop of 12 30 cm minimum sloping at least one half inch per foot 42 mm m of distance This will prevent backflow of water into the exhaust manifold due to pitching of the vessel Remember four feet is the maximum allowable vertical lift between the muffler and the top of the exhaust loop Pipe hangers should be used to support the tubing and prevent dips or pockets which allow water to build up in low sections of the line This causes back pressure and increases the noise level High exhaust temperature shutdown or alarm switches are available options and are required on wet exhaust systems used with keel cooled engines WARNING Scoop type water inlet fittings must A not be used They allow water to push up past the raw water pump when the generator is not in operation while cruising and this allows water to fill up the muffler With no exhaust pressure to force the water out of the muffler the water backs up into the exhaust manifold and into the cylinders WARNING If the engine is cranked for a consid A erable period of time wi
3. positive suction lift of up to 39 1 m The thru hull inlet fitting should be a flush type located beneath the water level during operation The inlet water strainer keeps most debris from reaching the raw water pump where it could break the impeller or clog the heat exchanger Cooling Systems EXPANSION TANK INTEGRAL HEAT EXCHANGER DRY EXHAUST FLANGE TO FRESH WATER PUMP INLET THRU HULL 1 Figure 5 Keel Cooling Closing the sea cock enables the owner to clean the sea strainer The raw water pump impeller is a main tenance item and easy access must be provided Make sure to provide easy access to the zinc s located in the heat exchanger If the fresh water pump is belt driven access must be available for belt replacement Siphon Break Required if engine is below water line Expansion Tank Raw Water o Exhaust Heat Exchanger To Muffier 5 Flush Thru Hull Fitting No Scoop Type Figure 6 Heat Exchanger Cooling IM1000 03 10 12 Fuel System Extreme care is required in the design and installation of fuel systems Fuel leakage presents a fire and explosion hazard Follow U S C G codes and use only components that are specified for marine applications Each Northern Lights generator has a fuel manifold with connections for supply and returned fuel The lines should be no smaller than these pipe sizes Pipe
4. sizes can be found on the installation drawing Fuel lines must have as few connections as possible The line should be routed where they are protected from damage and vibration They should be clamped securely about every 15 58 cm Metal fuel lines should be bonded to the common bonding conductor Fuel lines must be kept away from hot engine or exhaust areas Fuel should be drawn from the top of the tank and run at tank level as close to the engine as possible If a line breaks this will reduce the danger of fuel siphoning The fuel pick up tube should not draw fuel directly from the bottom of the tank but should be located 1 to 2 inches from the bottom and cut off diagonally The tank must be suitably vented Metal tanks must be properly bonded The bonding strap should be connected from the fuel fill to the fuel tank if a rubber connection is used A water separator type filter should be used between the tank and the generator set and located as close to the generator as possible To comply with U S C G regulations for boats for hire a shut off valve must be installed at the tank connection to stop fuel flow An electric or manual valve can be used Electric valves should be energized only when the engine control switch is in the run position Valves must have a manual override If a manual valve is used provisions must be made to operate it from outside the compartment where the tanks are located preferably from above the deck
5. there is a leak at any point including at the propulsion engine Air will be drawn into the fuel system which causes low power hard starting or generator engine shut down Due to the high return fuel rate of many propulsion engines it is common for air problems to show up in the generator before it shows up in the propulsion engine Every effort must be made to prevent air from being drawn into the system at any point If a lift of more than 39 inches 1 m is required pump and float tank arrangement can be employed The pump should be energized only when the generator control switch is in the run position in a separate compartment it is important that adequate ventilation is provided while the vessel is both underway and not moving Vents must be located so moisture is not ducted into the generators The vents should be protected so that water is not drawn into the generator during washdown Make sure that no moisture or contamination from the bilge can be drawn up into the generator itself IM1000 03 10 13 In a boat noise is transmitted two ways through the air or through the hull Proper installation can control noise from both sources Northern Lights generators have rubber isolation mounts which connect the unit to a rigid base frame The frame contains an integral drip pan By using a solid piece of plywood under the whole base frame the drum effect of vibration on the drip pan can be eliminated The th
6. ventilation to prevent the accumulation of explosive hydrogen gas generated during battery charging United States Coast Guard regulation 33 CFR 183 requires that the generator be grounded and that a common conductor be connected between the generator set grounded starter motor circuit and the vessel s main propulsion engine grounded starter motor circuit This conductor or common ground prevents the accidental passage of cranking current through the fuel system and small electrical conductors common to both engines This conductor should be the same size as the largest battery cable There is no consensus of opinion on whether the neutral conductor should be connected to the bonding system grounded or not floating ground Ground ing the neutral may increase electrolytic corrosion Not grounding the neutral creates a potential shock hazard The American Boat and Yacht Council recommends grounding the neutral at the generator for safety reasons though this may shorten the life of heat exchangers and other components Northern Lights heartily recommends grounding the neutral since personal safety takes priority over all other considerations For additional electrical information consult the AC wiring diagrams in the Generator Manual for the generator end installed on your set IM1000 03 10 15 IM1000 03 10 16 IM1000 03 10 4420 14th Ave NW Seattle WA 98107 Tel 206 789 3880 1 800 762 016
7. 5 Fax 206 782 5455 Northern Lights and Lugger are registered trademarks of Northern Lights Inc WWW northern lights com 2010 All rights reserved Litho USA NORTHERN LIGHTS
8. BOVE 4 1 23 LOAD LINE 1 FT STRAINER N 30 cm L l 2 SEACOCK MARINE RUBBER SLOPE DOWN y T cea ALLOW SPACE FOR ae 2 AIR CIRCULATED LINE BELOW MUFFLER Fig 1 Typical Installation The two main elements that decide where a generator vibration isolation mounts A rigid mounting base must should be located are 1 the availability of space and be used to mount the set to the engine stringers or other 2 the adequacy of structural support Thought should be strong supports This rigid base anchors the set and given to ventilation cooling and exhaust systems as well prevents noise transmission through the boat frame The and these areas will be covered later mounting base can be either metal or wood A thicker and The generator is usually located in the engine room more rigid base will cut down on the drum like tendency where there is already plenty of ventilation The main of the drip pan to magnify engine noise engine stringers can be used as supports If the It is important to use marine grade plywood or generator set cannot be located in the same compartment lumber make sure that the generator base supports the as the propulsion engine it should be in a properly complete underside of the drip pan Be sure that the base ventilated compartment isolated from the living quarters does not touch any of the bulkheads or
9. Ventilation Besides providing adequate air for engine combustion the generator end requires cooling ventilation The ventilation requirements for each generator set is available from Northern Lights Normally the generator set is located in the same compartment as the main engine Because the generator is usually small in relation to the main engine the ventilation is adequate If the generator set is located If the engine and fuel tank are separated by more than 12 feet 3 7 m a Coast Guard approved shutoff valve must be installed at the engine This valve makes it easy to change the filters without draining the entire fuel line and allows for easier engine servicing If the fuel tank is located above the engine provision should be made to shut off the fuel when the engine is not running and for servicing of the filters If the fuel tank is located below the engine there is a maximum lift of 39 inches 1 m on the suction side of the lift pump Long runs of piping with multiple connections and vertical looping create many points at which air can be trapped or sucked into the system Air can hamper engine performance and create starting problems The fuel lines should not be teed into the fuel lines of any other engine The supply pump on the generator does not have the power nor the capacity to overcome the draw of the propulsion engines When lines are teed or joined at a common manifold air will be drawn into the fuel system if
10. aska Diesel Electric Inc or any Northern Lights or Lugger dealer distributor or agent Northern Lights reserves the right to make product improvements NORTHERN LIGHTS and changes at any time without notice oo IM1000 03 10 3 IM1000 03 10 4 Model Numbers Model numbers give the unit s application block model aspiration and RPM L M NL 673 D T A L W H Model number D Naturally Aspirated L Northern Lights propulsion engine Lugger of base engine block y ASP M Northern Lights marine generator set T Turbocharged NL Northern Lights industrial generator set A Aftercooled amp Turbo L Long Stroke W Auxiliary Winding in Gen End H High Output For example M673 Northern Lights marine generator set with a 673 engine Serial Numbers When referencing Northern Lights equipment by serial number it is important to differentiate between 1 the engine 2 the generator end and 3 the generator set serial numbers The engine serial number is either on a metal tag or stamped directly into the engine block The generator END serial number is on a metal tag attached to the generator end The generator SET serial number is a separate metal tag attached to the generator end It may be a five by one inch tag installed directly below the generator end tag lower left Or it may look like the examples on the right Please use th
11. e for the temperatures involved and thick enough to prevent the surface of the insulation from reaching a temperature above 71 C 160 F The exhaust system must be piped so that air circulates freely around it Water must be prevented from entering the engine through the exhaust Provision must be made for drawing off rain water entering the silencer or putting a tee connection in the exhaust pipe The exhaust pipe between the manifold and the silencer should be water jacketed but may be dry if adequately shielded or covered to prevent burns A flexible connection must be used between the engine and the exhaust piping Exhaust piping silencers and other parts of the system must be supported through the length of the system It is important that the engine exhaust elbow does not support any weight of the exhaust system IM1000 03 10 11 KEEL COOLING OR SKIN COOLING Keel cooling or skin cooling is a closed circuit method of cooling that uses only fresh water Engine heat is dissipated by passing coolant through tubes fitted to the outside of the hull keel cooling or incorporated as part of the hull skin cooling Keel coolers protrude from the bottom of the boat The engine circulating water pump is the only pump necessary The size and length of the tubes is determined by the horsepower and water flow of the engine When sizing keel coolers for generator sets they must be larger than those for an equivalent propu
12. e generator SET model and serial numbers in correspondence or when ordering parts NORTHERN LIGHTS NORTHERN LIGHTS NORTHERN LIGHTS zu i DIESEL ELECTRIC amp POWER SYSTEMS Serial No AC Generator Data Model No Model No Northern Lights Serial N 4420 14th Ave NW ena Ne Alaska Diesel Electric 4420 14th Ave N W Seattle WA 98107 WIRE Seattle WA 98107 206 789 3880 DUTY INSUL O 2 Generator Set Data KVA AMB C Set Serial No Set Model No HERTZ VOLTS PURGE VOLTS C RISE AMES RULE AMPS Alaska Diesel Electric Seattle WA USA Generator Set Data Set Seria Set Model IM1000 03 10 5 A warranty registration certificate is supplied with your set It entitles the original purchaser of our equipment to a warranty covering material or assembly faults The extent of coverage is described in the Limited Warranty Statement L581 We recommend that you study the statement carefully If the warranty is to apply the installation instructions outlined in this manual must be followed If further information is needed please contact an authorized dealer or the factory Safety Rules Accident reports show that careless use of engines causes a high percentage of accidents You can avoid accidents by observing these safety rules Study these rules carefully and follow them on
13. ecial tools and knowledge Northern Lights strongly recommends that this work be performed by a qualified dealer or boatyard For the safety of the set the vessel and all those aboard owner installations must be reviewed by a qualified inspector Proper planning is essential for a successful installation You will find all necessary measurements on the dimensional drawings available from your Northern Lights dealer Be sure to use current drawings since the sets are continuously being improved Plan your installation so the inspections and service work outlined in your owner s manual can be easily performed Use only quality marine grade materials throughout the installation Follow all safety precautions Areas of special concern are mounting the set ventilation supply and discharge of cooling water exhaust discharge fuel lines electrical wiring system bonding and service access Under no circumstances are Northern Lights diesel powered gen sets or Lugger marine diesel engines or any other diesel powered equipment provided by Alaska Diesel Electric Inc to be installed or used in any vessel in which a gasoline engine is also present Northern Lights and Lugger products do not include spark arresting and explosion proof electrical components necessary to operate in the presence of gasoline or gasoline fumes The installation of Northern Lights and Lugger products in vessels that also include gasoline powered engines is not authorized by Al
14. eg as well as low output Since don t put heating loads on one leg and air conditioning the engine is not affected by an unbalanced overload it is loads on the other leg Improperly balanced loads may possible to damage the generator Motor Loads Electric motors and appliances containing electric several voltages for example 120 volts or 240 volts it is motors usually require up to ten times the running wattage usually more efficient to wire it at the higher voltage during starting A good rule of thumb when working with Some devices utilizing non linear loads SCR motor loads is to take the running wattage of the largest devices may cause a distortion in the waveform of motor and multiply that by ten Then add the running the generator s electric output This can lead to the wattage of all the smaller motors as well as the wattage malfunction of the voltage regulator and overheating of all the other loads This will add up to your total load of the generator rotor Consult the factory for specifics Determine how much of the total load will be pertaining to your generator set operating at the same time If a motor can be wired up at IM1000 03 10 7 Mounting SIPHON BREAK If engine is below u load water line B SUPPORT EXHAUST WATER SLOPE DOWN PER FOOT INJECTION 42 mm m BATTERY BOX X Non metallic ventilated S EXHAUST 7 OUTLET ee N 4 FT MAX A
15. for each ten feet 3 048 m in length The waterlift muffler should be mounted below the exhaust manifold The exhaust line should pitch downward at least one half inch per foot or 42 mm m of line from the point of water injection to the muffler Do not connect the muffler directly to the exhaust manifold see Figure 2 On heat exchanger cooled units the raw water flow can be injected into the exhaust system On keel cooled units a separate raw water pump will be required to inject water into the exhaust The outlet line from the waterlift muffler should loop at least 12 30 cm above the water line Avoid any low spots or belly in the hose where water can be trapped and flow back into the engine when the boat pitches and rolls The highest point of the loop should be no more than four feet 1 23 m measured from the bottom of the muffler WARNING If the point of water injection cannot be located at least 12 30 cm above the water line a SIPHON BREAK will be required to prevent siphoning the exhaust water back into the exhaust system If a siphon break is used it should be located between the raw water pump and the inlet to the heat exchanger This will allow positive closure of the valve in the siphon break during engine operation The siphon break should be located at least 12 30 cm above the water line see Figure 3 DO NOT use a drip tube on the siphon break as it will negate the function of the valve IM1000 03 10
16. free board which Generator set location should provide easy access for will amplify noise transmission from the engine Mount the regular maintenance and fuel system adjustment Bear generator away from bilge splash and low lying vapors in mind that the generator set will require replacement Because flexible mounts are used the generator will of worn parts and eventual overhaul The control panel rock during engine operation in rough seas Therefore should be located so it can be easily monitored during you must plan for adequate clearance on all sides Use generator operation For ease of servicing make sure that flexible connections on all lines and connections the sea cock and the inlet water strainer are completely Dimensions weights and maximum operating accessible angularity vary by model and are available from Northern Lights generators are supported on a frame Northern Lights that incorporates a drip pan and is equipped with IM1000 03 10 8 Exhaust System SUPPORT 1 FT MIN RAW 30 cm WATER TO EXHAUST LOAD Figure 2 Exhaust WATER Manifold LINE ABOVE ANGLE DOWN Todd WATER 1 2 PER FOOT Water INLET 42mm m Line WET MUFFLER 4 SUPPORT 1 FT MIN 30 cm 1 FT MIN 30 TO EXHAUST 7 gef WATER ANGLE DOWN LINE 1 2 PER FOOT FT MAX 42 1 23 Fig
17. he generator for the installer to hardwire the AC connections Current transformers must also be installed on the gen erator output leads Series 1 Series 3 and Series 4 panels can be used together in multi panel systems Some combinations can be made without modification by using connectors Others require dual senders or other modifications See your dealer for information on the panel combination you want to use The DC electrical drawings in the operator s manual show the required wire sizes Panels can be installed up to 40 12 m from the generator For runs longer than 40 contact your dealer or factory office for information IM1000 03 10 14 Northern Lights generators utilize negative ground electrical systems The negative terminal of the battery should be connected to the cap screw on the bell housing near the starter In the case of a float ing ground however do not connect the negative terminal to the engine block Instead connect it to the grounding post provided The positive terminal should always be connected to the starter solenoid terminal marked positive Always use batteries at least as large as those listed in the specification section at the end of this manual The specifications also list recommended wire sizes and maximum distances that the batteries can be located from the engine The generator should not be operated off the propulsion engine s starting batte
18. icker and more rigid the mounting base the lower the transmission of noise Mount the generator on as rigid a base as possible Avoid using light stringers or bulkheads that can vibrate and amplify noise Be sure the generator does not touch bulkheads the hull or other structures Be sure that all fuel lines connected to the generator are secured and contain flexible connections to the generator Some of the units larger than 20 kW can be fitted with isolation mounts which increase the isolation of the unit and cut down the transmission of vibration Noise transmission through the air can be caused by Northern Lights generators 20 kW and below are provided with a Series 1 B control panel as standard equipment The panel consists of an hour meter a double pole double throw start stop switch and a single pole momentary contact preheat bypass switch The preheat bypass switch operates any preheaters and bypasses the safety shutdown system for starting There is a light in the start stop switch which indicates that the generator is operating The panel is designed for remote mounting and is connected to the generator by a plug type connector The unit comes standard with 20 ft 6 m harness 10 20 and 40 foot 3 6 and 12 m harness extensions are optional Units larger than 20 kW come standard with the Series 3 panel The panel is provided with a plug in or on some models a terminal strip that must be hardwired by the installer to
19. ipment wattage If there is no data plate or if the generator is determined by the total wattage of all the information is not supplied on the data plate call your equipment and appliances which will be operated dealer for typical wattage requirements of some motors simultaneously Selecting a generator that is too small and appliances Motors and other loads require several for the peak load can make it hard to start motors in air times full load current under starting conditions If the conditioners or water makers for example Selecting too motor starting load is large a voltage dip may cause the large a generator causes the engine to operate in an overly lights to dim or relays to chatter cool condition which causes injector and valve carboning A good rule of thumb is that the continuous load and the pumping of raw fuel into the exhaust should be at least 50 of the generator capacity It may The wattage required for any given piece of be advantageous to use two smaller sets equipment is usually printed on the name plate If only Circuit Breakers An AC circuit breaker should be installed on all windings in case of a short circuit or an overload due to Northern Lights generators to protect the generator unbalanced load conditions Balancing Loads All loads which will be used at the same time must be cause a loss in voltage on the loaded leg and excessive divided up equally among the output legs For example voltage on the unloaded l
20. lift Exhaust Systems a eh en 10 Dry Exha st to AA A A COOLING SYSTEM Keel Cooling or Skim Cooling Heat Exchanger Cooling u ee ei FUEL SYSTEM VENTILATI N a aa aaa ee na anna a COIN DC ELECTRICAL SYSTEM dida Batteries dada AG ELECTRICAL 5 Proprietary Information This publication is the sole property of Northern Lights Inc It may not be reproduced in whole or part without the expressed written permission of Northern Lights Inc Northern Lights Inc 2008 All rights reserved Litho U S A Publication number IM1000 03 10 IM1000 03 10 1 IM1000 03 10 2 Introduction NORTHERN LIGHTS A LUGGER Read this manual thoroughly before starting to install your equipment This manual contains information you will need to do the job correctly and safely This manual will explain installation procedures for Northern Lights marine generator sets The instructions are general in nature and intended to be used only as guidelines If you have questions please contact your local dealer or factory office The installation of a marine generator is a complex task that requires sp
21. lsion unit because the generator set normally sees maximum load while the boat is at rest when no water flows past the coolers Do not combine the keel cooler for the generator set with the keel cooler for any other engine on the vessel If a wet exhaust is desired on a keel cooled or a skin cooled unit a separate pump is required to draw raw water from a thru hull fitting into the exhaust A high exhaust temperature switch is also required HEAT EXCHANGER COOLING In a cooling system with a heat exchanger and with thermostats closed a fixed amount of fresh water circulates through the engine s cooling loop When the thermostats are open the coolant is directed through the heat exchanger It is cooled by raw water that is pumped in by way of a thru hull fitting sea cock and strainer then through the heat exchanger and directed overboard through a wet exhaust or another thru hull fitting Scoop type inlet fittings must not be used because they can cause water to be forced up into the raw water system when the generator is not in operation if the vessel is underway The waterlift muffler will flood and fill up the exhaust manifold with water The sizing of the thru hull fitting the sea cock and the strainer should be no smaller than the inlet to the raw water pump For raw water pump inlet sizing please see the appropriate installation drawing or call your dealer The raw water pump is a neoprene impeller type pump which provides a
22. ries Dedicated generator batteries should be used This prevents unintended discharge of the propulsion engine batteries as well as providing an extra set of batteries onboard should the need arise When providing a separate set of batteries be sure to include a shore powered charging system for the generator batteries AC Electrical System Due to the possibility of fire and shock hazards it is important that a qualified electrician installs and inspects the boat wiring All wiring must meet Coast Guard NFPA and any other applicable codes A circuit breaker should be installed as close to the generator as possible Flexible wiring should be used between the generator connections and the circuit breaker Most builders use flexible multi strand wire throughout the boat to minimize breakage due to vibration The electrical distribution system must be designed in such a way that individual circuits cannot be energized by more than one source of electrical power at a time Each shore power connection or generator is a separate source of electrical power and transfer between sources should be made with a switch that has arc over protection between the contacts Secure the batteries in an acid resistant container on a platform above the floor Use a nonmetallic cover to prevent damage or sparks Generator batteries should be installed as close to the unit as possible but not directly under the generator WARNING Be sure to allow plenty of
23. s parallel to the U e Use raw water strainer on intake Use primary water separator fuel filter vessel s center line Use grommets on wire openings in junction box DON T Use protective circuit breakers e Use scoop type water inlet through hull fittings Use good bonding system At high speeds scoops pick up water which is forced past the impeller in the raw water pump Water will e Balance load on generator legs fill the cylinders and ruin the engine Use gravity feed fuel filter wherever possible e Put seasonal load on one leg of generator heaters e Install so engine service side is easily accessible Split loads between legs IM1000 03 10 6 Model Selection Northern Lights produces marine and land based After that you can customize the chosen set to generator sets that operate at 1500 and 1800 RPM with match your vessel s needs Modifications include single ratings from 4 5 kW to 280 kW phase or three phase 50 cycle output heat exchanger or With this broad range of sets to choose from it is often keel cooling wet or dry exhaust and 12 or 24 volt difficult to determine which is right for your vessel Begin starting systems the selection process by estimating the electrical load Estimating Electrical Load It is important to match the correct Northern Lights the amp rating is listed multiply amps x voltage to get generator with your vessel s electrical load The right the equ
24. the job e Turn the coolant tank cap slowly to relieve pressure Use caution in handling fuel Never re fuel a hot or before removing Add coolant only when the engine running engine Do not smoke while filling fuel tank is stopped and cool or servicing fuel system e Mount fire extinguisher near engine e Keep your hands feet hair and clothing away from ower driven parts e Always disconnect the battery ground strap before making adjustments e Check for any loose electrical connections or faulty 22 wiring e Operate engine in properly ventilated areas Engines should be operated only by knowledgeable e Keep trash and other objects away from engine qualified personnel Escaping fluids under pressure can penetrate your Walk completely around engine to make sure that skin Use a piece of cardboard or wood not your everything is clear before starting it up hands to search for fuel leaks Do not operate an engine that isn t proper working e Avoid wearing loose clothing without a belt when order If an unsafe operating condition is noted tag working around engines the engine so others will also know about it e not oil or grease engine while it is running e Provide first aid kits Do s and Don ts DO e Allow easy access to expansion tank se siphon break on sets near waterline see page 8 Mount wet muffler lower than the exhaust manifold Install the unit so the crankshaft i
25. the terminal strip on the generator This panel includes the stop start switch preheat bypass switch hour meter DC volt meter oil pressure gauge and water temperature gauge Noise Control intake air noise exhaust noise and noise radiated from the generator and engine Intake noise is controlled in Northern Lights generators by using special air intake housings Many competitive generators use only intake screens which offer no silencing Be sure to service the air filter properly and replace it with the correct type Exhaust noise can be limited by use of water lift type mufflers and flexible exhaust hose Be sure that any sections of hard exhaust tubing are not rigidly mounted to bulkheads or the hull Use a flexible connection to the transom Many Northern Lights sets can be mounted in an optional sound shield to reduce noise It provides easy access for service and can be quickly disassembled for repairs A separate installation booklet is supplied with the sound shield The engine room itself can be lined with insulating material which reduces noise transmission to other parts of the vessel DC Electrical System Optional Series 4 panels include all items listed for the Series 3 as well as an AC volt meter AC ammeter amp meter selector switch and a frequency meter The DC control and meter connections are the same as the Series 3 panel A terminal strip is provided in the Series 4 control panel and in the junction box of t
26. thout firing raw water can fill up the muffler and back up into the exhaust manifolds due to lack of exhaust pressure to evacuate the muffler If the engine must be cranked for more than one minute at a time without starting for example to bleed the fuel system close the seacock and remove the raw water pump impeller until the engine can be started Then stop the engine immediately replace the impeller and open the seacock The exhaust water piping should be isolated and not connected to the exhaust piping of any other engine The installed exhaust system should not create exhaust back pressure greater than 30 760 mm of water for a turbocharged engine and 48 1200 mm for a non turbocharged unit measured at the engine exhaust elbow The exhaust outlet must be located as close to the outboard side of the transom to minimize exhaust gases being drawn onboard the vessel The exhaust outlet should not be located near hatches or portholes and must be above the water line DRY EXHAUST Because of the high temperatures involved in a dry exhaust system each part of the system must be well insulated from any combustible surface and equipped with guards to prevent burns Dry exhaust shall not come in direct contact with bulkheads or other combustible materials A clearance of 9 23 cm must be maintained between the exhaust and any combustible material unless protected by suitable insulation The insulating material must be suitabl
27. transom location is best WATERLIFT EXHAUST SYSTEMS The waterlift exhaust system is a simple inexpensive method of exhausting engine exhaust in raw water from the cooling system The waterlift muffler is a cannister with an inlet and an outlet the outlet pipe extends inside the cannister almost to its bottom The engine cooling water is injected into the exhaust line near the exhaust manifold Water from the wet exhaust fills the cannister above the bottom line of the outlet pipe effectively blocking the outlet When sufficient pressure builds up the water and exhaust gases are literally blown out of the submerged outlet pipe and the cycle begins again Boats equipped with water lift systems are easily identified by the bursts of cooling water from their exhaust pipe Exhaust System The water should be injected into the exhaust system as close to the exhaust manifold as is possible All Northern Lights generators can be supplied with water injection elbows which attach directly to the wet exhaust manifold Rubber hose designed and approved for marine exhaust line use can be used for the point of water injection Any piping before the point of water injection must be water jacketed or insulated to minimize heat rejection and fire risk Flexible rubber exhaust hose allows for easy installation and flexibility The exhaust line should be at least as large as the engine exhaust outlet The line should be increased one pipe size
28. ure 3 Exhaust i Manifold RAW AT WATER Tosd INLET Water Line WET MUFFLER RAW SUPPORT TO EXHAUST INSULATED EXHAUST 30 cm a LOAD WATER Y STAINLESS STEEL LINE AT M RAP FLEX SECTION ge ep Ya ANGLE DOWN Aber ya 1 2 PER FOOT mu A 42mm m J Figure 4 A Exhaust Manifold WET MUFFIER 1 BELOW A Load np INLET ine IM1000 03 10 9 GENERAL There are two basic types of exhaust systems used in marine generator set installations A Wet Exhaust the exhaust gases are cooled by the addition of water from the engine cooling system at some point along the exhaust system The exact point at which the water joins the exhaust gases depends on whether the engine is mounted above or below the water line B Dry Exhaust the exhaust gases are not mixed with the water The exhaust system is completely dry and also very hot All pipe work must be insulated WET EXHAUST Advantages less fire risk the amount of heat given off in the vessel is less it is very quiet WARNING Extreme care must be taken during installation to prevent backflow of water into the engine under any conditions Water flowing back to the engine will damage it and possibly flood the boat The exhaust outlet must be above the load water line On sailboats provisions must be made to prevent the exhaust exit from being below the water line in any running angle especially during tacking or heeling maneuvers A
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