5

REGULATORS

ABYSS - ABYSS OCTOPUS

INTRODUCTIONCongratulations. You have purchased one of the finest, most dependable regulators available on the market today. Your MARES regulatorhas been constructed using manufacturing processes and materials which are the result of fifteen years of continuing research andevolution. This sophisticated technology is backed by the guarantee that every component of your regulator has been tested at our modernfacility in Rapallo, Italy. All this is synonymous with reliability, a fundamental requirement for any piece of diving equipment, which you willfind in EVERY MARES product.This manual is intended as a guide for experienced technicians, and not as a comprehensive instruction book on all aspects of divingequipment for inexperienced repair personnel.MARES periodically offers technical training courses at its factory. Technicians are strongly advised to obtain specific practical training inthe servicing of MARES diving equipment before attempting any repairs.Carefully read all parts of this manual before undertaking any repairs.

Important:Any critical information or warnings that might affect the performance or result in the injury or death of the technician, regulator owner, orother persons is highlighted with the following symbols:

MARES reserves the right to modify any products, processes and manufacturing techniques at any time. It is the technicians' responsibilityto acquire the latest information and parts from MARES for service and repairs to be performed.

IMPORTANT:If the instructions provided in the manual are unclear or difficult to understand, please contact MARES before using the regulator orattempting any repairs.

� WARNING

As with all SCUBA equipment, MARES regulators are designed to be used by trained, certified divers only. Failure to fullyunderstand the risks of using such equipment may result in serious injury or death. DO NOT use this regulator or anySCUBA equipment unless you are a trained, certified MARES diver.

� WARNING

Carefully follow these and all the other instructions concerning your MARES regulator and all other SCUBA equipment.Failure to do so could lead to serious injury or death.

� CAUTION

Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also beused to alert against unsafe practices.

� WARNING

Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

� DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

� WARNING

CAREFULLY READTHIS INSTRUCTION MANUAL BEFORE USE, AND KEEP IT FOR FUTURE REFERENCE.

5

REGULATORS

ABYSS - ABYSS OCTOPUS

NTRODUCTIONCongratulations. You have purchased one of the finest, most dependable regulatooooroooo s aaaaavvav ilabb eleleleee on thththhe meee arketetetet toootoddaday. Your MAREREEEEEES rSS rS rSS rSS rS eegeegegeguluululululululatataaaaaa orhas been constructed using manufacturing processes and mateerials which arararararara eee te te tee thhhhhehhh result ofofoff fiff fteeeeen ynnn ears of continuingg rererereererereseeseararararararara chchhchchchchch aaandevolution. This sophisticated technology is backed by the guarantntntn eeee thththhata everrrrry cyyy ompoppopopopopopoponent of your rerereregulaaaatotototoor has been teststststsstededdededededede attatataaaaa ououuouuo r modernfacility in Rapallo, Italy. All this is synonymous with reliability, a fuuuundndndndn aaamenental reqqqquiuuu remememememmment for any piecccce ooe oeeee f diving eququuuuuuipipipipipipppmememememememeement, wwwwwwhhhihhhhhh chchchch you willfind in EVERY MARES product.This manual is intended as a guide for experienced technicians, anddd nd not asasas a commmmprppp ehhenenensive instruction boookkkkkk onononononoonono alalalaa l aaaal aal aaaspssssss ects of divingequipment for inexperienced repair personnel.MARES periodically offers technical training courses at its factctttororoorory.y.y.y.y. TeTechniciiiaaanans arerere strongggglylyylylyy aaadvised to obtbtaiaiaaiaiaaaiin sn sn sn sn sn snn pepepepeppp cicicicicicicifififififififif ccc pccccc ractical training inthe servicing of MARES diving equipment before attemptingnggngng any repaiirsrsrsrss....Carefully read all parts of this manual before undertakinnnnnggg ag nyyyyyy rererereererer papapapapaairs.

Important:Any critical information or warnings that might affect tt ttttthheh peeeeerfrrrrr ororormancncnce ooooor rr esuuuulu t it n the injury or dr dr ddddeaeaeaaeathththth ofofofffofff ththththtththe technician, regulator owner, orother persons is highlighted with the following sssymymymmmmboolssssss:

ARESSS rSS eserveveves the righghghhght tto mo mo mo mo mo odify any productsttstststs, processssssssses and manufacturing techniques at any time. It is the technicians' responsssibibibquirirrrre teeee he lateteteeeststststst ininininini fofofofoformaaatatataa ioi n and partrtrttts fs fss fs frororororoom Mmmm ARARARARARRESESSESSSESESE for service and repairs to be performed.

TANNNNT:T:T:TT::ctions provided in the mamaaaaanun al are uue nclear or difficult to understand, please contact MARES before using tthehehe

repairs.

� WARNING

ES regulators are designed to be used by traineuipment may result in serious injury or d

d, certified MARES diver.

� WARNING

and all the other instructions concerning your MARES regulator and all otad to serious injury or death.

���� CAAAUTION

Indicccccacc tesss as potentntttntiaiaiiially hazzzaraa dous situation wn wwwwwwhihihihiichchchchch, if nottot avoided, may result in minor or moderate injury. It may also beuseedededee to aaaala ert againststttttt unsafe ppprp actices.

� WAAARRRNIIINNNGG

Indicaatetetet s a poootetetentially hy hy hy hy hazardoooousuuu situation which, if not avoidedeed, coulddd result in death or serious injury.

������ DAAAANNNNNGGGER

Indicates an imminnnently hazararrdododododododoususuuu situattttioioiiii n whhhihhh ch, if not avoided, willl rrresult in ddddeath or serious injury.

� WARNING

REFULLY READTHIS INSTRUCTION MANUAL BEFORE USE, AND KEEP IT FOR FUTUUUURERRR REREREEEFERENCE.

6

EC CERTIFICATIONThe MARES regulators described in this manual have been tested and certified by Registered Test Centre No. 0426 - Italcert - Viale Sarca336, Milano - I, in compliance with EC directive 89/686/EEC of 21 December 1989. The test procedures were conducted according to theEN 250: 2000 standard, in conformance with the aforesaid directive which sets out the conditions for marketing and essential safetyrequirements for Category III Personal Protective Equipment (PPE).The certification testing results are the following:

Model Warm water ColdWater Marking Position(Temp. > 10°C) (Temp. < 10°C)

Abyss approved approved CE 0426 On the first stageAbyss Octopus approved approved CE 0426 On the hose

The CE0426 mark of the Abyss Octopus is an adhesive label affixed to the hose. This label must never be removed. If the label isaccidentally removed, the applicable CE mark for the Abyss Octopus will be the one on the Abyss first stage to which it is connected.The CE mark certifies compliance with the essential health and safety requirements (DE 89/686/EEC Annex II). The suffix 0426 after theletters "CE" indicates the Italcert Registered Test Center in charge of monitoring the production under Art. 11B DE 89/686/EEC.

REFERENCESTO EN 250: 2000 - OBJECT - DEFINITIONS - LIMITSObject: The requirements and tests provided for in EN 250: 2000 are aimed at providing a minimum safety level for the operation of divingbreathing apparatuses at a maximum depth of 50 m / 162 feet.Scuba - Definition: Self-contained, open-circuit compressed air underwater breathing apparatus is an apparatus which has a portablesupply of compressed air carried by the diver, allowing him to breathe underwater.Scuba - Minimum equipment (EN 250: 2000):a) Air tank(s).b) Regulator.c) Safety device, e.g. pressure gauge/computer, reserve mechanism or alarm.d) Transport and retaining system, e.g. backpack and/or straps.e) Facepiece (mouthpiece assembly or full-face mask or diving helmet).f) User instructions.

Limits (EN 250: 2000)- SCUBA - Component Units (EN 250: 2000):): The SCUBA unit can be made up of separate pieces of equipment such as a tank,

regulator and submersible pressure gauge. The MARES regulators described in this manual can be used with other SCUBA unitcomponents certified according to directive EEC/89/686 and EN 250: 2000. The air contained in the tanks must conform to therequirements for breathable air set out in EN 12021.

- Maximum depth: 50 m / 162 feet.- Pressure max 232 bar (international YOKE CGA 850 adapter) Fig. 1a.- Pressure max 200 bar (DIN 477/13 screw) Fig. 1b.- Pressure max 300 bar (DIN 477/50 screw) Fig. 1c.- Warm water regulators - water temperature over or equal to +10°C (50°F).- Cold water regulators - water temperature below +10°C (50°F).

Under the EN 250: 2000 standard, water is considered to be cold at a temperature below 10°C. To use MARES regulators in cold waterconditions, always install the CWD (Cold Water Diving) kit. THE CWD KIT SHOULD ONLY BE INSTALLED BY AN AUTHORIZEDMARES SERVICE CENTER.

- The Abyss Octopus second stage can only be used with the Abyss first stage (MR22) or with certified MARES regulators.

� WARNING

Diving in cold water (below 10 °C) without special training and equipment may cause serious injury or death. Before diving incold water, obtain special training from a certified diving instructor. Since it is not possible to prevent a regulator from freezingunder any and all conditions, MARES regulators too, though equipped with a CWD Kit, might undergo "freeze-up" phenomena.Should this happen, regulators may not function properly and could cause serious injury or death. Therefore, to minimize risks,appropriate training is required to prevent or cope with any problems caused by a regulator affected by "freeze- up" phenomena.The following precautions must be taken when diving in cold water:1) Do not breath from or exhale through the regulator when out of the water.2) Press the purge button only when underwater, and then very gently and for very brief periods.

� DANGER

MARES regulators and octopus are designed and intended for use only with clean, compressed atmospheric air. Do notuse this equipment with any other gas or enriched air.Failure to adhere to this warning may result in serious injury or death due to fire and explosion or the serious deteriorationor failure of the equipment.

6

een tested and certified b86/EEC of 21 December 1989

e aforesaid directive which sets oue Equipment (PPE).

ng:

ColdWater Marking0°C) (Temp. < 10°C)

ed approved CE 0426oved approved CE 0426

Abyss Octopus is an adhesive label affixed to the hose. This label must neverhe applicable CE mark for the Abyss Octopus will be the one on the Abyss first staageg tot whw

es compliance with the essential health and safety requirements (DE 89/686/EEC AAAAAAnnexex IIIIIII))).))).. ThTTates the Italcert Registered Test Center in charge of monitoring the production undeeer Ar Arrrrrr rt. 11. 1. 11. 1. 1B1B1B1B1B1BBBB DED 89898989/6

CESTO EN 250: 2000 - OBJECT - DEFINITIONS - LIMITShe requirements and tests provided for in EN 250: 2000 are aimed at providing a mininiiimummm m ssaaaafaaaa ety level for tthehehehe oppeeerere atatat

ng apparatuses at a maximum depth of 50 m / 162 feet.ba - Definition: Self-contained, open-circuit compressed air underwater breathing ag agg aag aag aapppppppppppppparatus isissis an apapapparatus which has a popopo

upply of compressed air carried by the diver, allowing him to breathe underwater.Scuba - Minimum equipment (EN 250: 2000):a) Air tank(s).b) Regulator.c) Safety device, e.g. pressure gauge/computer, reserve mechaahahah nismsmsmmm or alarmmmm.d) Transport and retaining system, e.g. backpack and/or straps.e) Facepiece (mouthpiece assembly or full-face mask or diving helmmmmmmmeeteee ).f) User instructions.

Limits (EN 250: 2000)- SCUBA - Component Units (EN 250: 2000):): The SSSCCUCUCUCUBA unit cacacacacan bnn e mmmmada e uuup op f separate pppiececececececes os os os os os ooof ef ef ef eff efff ququququququuuuq ipipipipippipment such as a tank,

regulator and submersible pressure gauge. The MAAAAAARES rS rS rS rrS regeegegeegegguluuuuu ators ddddddescribbbedededed innn tht is manual caaaacacaan bn bnnnn bnn e ue ue ue ue ue ue uuseseseseeseseseeddd wdd ith other SCUBA unitcomponents certified according to directive EECC/8/8/8/8/8/89/6888888866 andddd EN 22250:0::0:0: 202 00. TTTTTTThe air containnnnnedededeed innnninnin ththththththhthe teeeeeee anks must conform to therequirements for breathable air set out in EN 120211..

- Maximum depth: 50505050500 m /m /m / 116162 f2 f2 f2 eet.- Pressure me mmaxaxax 232 bararraarar (internaaaatittt onal YOKE CGCGCGCGCGCGGA 8A 8A 8A 8AA 505050 adapter) Fig.g. 1a.- Pressururruree max 2020200 bar (D(D(D(D(DIN 477////1313131 screw) Fig. 1b.- Pressuree me me max 30000 bar (DINNNNN 477/500 scscss rew) Fig. 1c.- Warm waterererr regulatooorsrr - watererererer temperratatata ure over or equalalal to +10°C (CC 50°F).- Cold waterererererr rererereregggugg lators - wwwater tempmpmpmm eraturrre beee elow +10°C (50°F).

Undeer tr tr trr he ENENENENENE 252552525250:0:0:00: 2000 stststanaa dard, wwwwwwaaater is considdere ed tooo bebb cooldldld at a temperature below 10°C. To use MARES regulators in cold watercondddddddiiitionssssss, a, lways iiiinsnnnn tall the Ce Ce CWD (Cold Watatateeerererere iDiDiDivivvvivingnn ) kit. THE CWD KIT SHOULD ONLY BE INSTALLED BY AN AUTHORIZEDMAARRRERRR S SSSSSEERVICE CEEEEEEENTNNN ER.

ge can only be used with the Abyss first stage (MR22) or with certifie

� WARNING

n coldllddldlld wwwawawattttetet r (below 10 °C)C)C)C)C)C without sssspep cial training and equipment may cause serious injury or death. Befororreeeobtain special traaining fffrororororroom am aaaaaaa cccertified diving instructor. Since it is not possible to prevent a regulator fr fr fd all conditioioioonss, MMMMMARAAA ES regulators too, though equipped with a CWD Kit, might undergo "freeze-up

pen, regeggggggulu ators mmmmmmmaya not function properly and could cause serious injury or death. Thereforeg is rreeqeeqeqequired tooo po po revent or cope with any problems caused by a regulator affected by "freeze

utionnnnns ms ms ms ms mmussusususuusu t be taken when diving in cold water:or exhale through the regulator when out of the water.

n only when underwater, and then very gently and for very brief period

��� DDDDDDAAAAAANNNNNGGGGGEEEEEER

MARES regulators and octopus are deessssis gneddddddd and intnttnttenenenenenenndededededededed fd fd fd ffd foorooo use only wy wy wititith cccch ch cleleleleleeleleeananananananannan,,, c, ompressed atmospheric air. Do notuse this equipment with any oththttt er gas oorrrr er nriccchhehhhh d air.Failure to adhere ttto tooo his warrrnnning mamamamamamay ryyyyy esuuuuulu t in sssssereee ious injury or death dddue to firee and explosion or the serious deteriorationor failure of theee eeequipmpmpmpmennt.t.tt.t.

7

GENERALWORKING PRINCIPLERegulators reduce cylinder pressure, referred to as inlet pressure, to a pressure suitable for breathing. Modern regulators do this in twostages connected by a hose. The first stage provides pressure to the second stage; this reduced pressure remains constant despite thesizeable changes undergone by the cylinder inlet pressure during the dive (dropping from 3000/4350 to few hundred psi). The secondstage brings pressure down to ambient pressure and delivers air only when the diver inhales. Each stage of the regulator contains aninternal valve.When the diver inhales, the pressure inside the case is lowered and a pressure differential (imbalance) is created across thediaphragm (beginning of inhalation). The response of the diaphragm is to bend inward, contact the lever and open the second stage valve.Air continues to flow into the case until the pressure balance is regained (end of inhalation).

FIRST STAGEFor the second stage to work properly, the 1st stage must deliver air at a correct and - most importantly - constant intermediate pressure.This characteristic, provided by all MARES first stages, is essential for obtaining optimal adjustment of the second stage and ensuring topperformance for the entire duration of the dive, regardless of tank pressure.All MARES first stages are available with the following types of tank valve fittings: DIN 477/13 screw (max pressure 200 bar), DIN 477/50screw (max pressure 300 bar), international YOKE CGA 850 adapter (max pressure 232 bar), in accordance with the EN 250: 2000standard.

SECOND STAGEThe purpose of the second stage is to deliver air at ambient pressure, only during the inhalation phase. The diagram of a 2nd stage shown inFig. 4 illustrates its operation.When the diver inhales, the pressure inside the second stage decreases, creating a pressure difference (imbalance)between the two sides of the diaphragm. This pulls the flexible diaphragm inward, pressing the demand lever and unseating the second stagevalve.This opening allows air to flow in through the second stage and to the diver, until the diver stops inhaling. At this point the internal 2nd stagepressure increases, pushing the diaphragm back in the opposite direction, causing the valve to return to its seat and shutting off the airflow.

Abyss (MR22) First Stage (Fig. 2)The Abyss (MR22) diaphragm first stage features the DFC system and a replaceable HP seat connector.The high pressure poppet was designed for a "2 year or 200 dives" service interval; double the high pressure seat life standard!Compact body, in a modern and smart style, it is made of hot-forged nickel-plated and chromed brass.It is fitted with a preferential intermediate pressure port for connection to the primary second stage, plus 3 other LP ports and 2 HP portswith 7/16" UNF thread.The latter are inclined at a 45° angle to allow a more rational layout of hoses.

DFC SystemThe exclusive MARES DFC system featured on the Abyss (MR22) first stage minimizes the intermediate pressure drop which occurs in allregulators during the inhalation phase (Fig. 3). This phenomenon is all the more marked when higher airflow is demanded of the regulator.The DFC system substantially reduces breathing effort and inhalation resistance, especially during deep dives and under demandingconditions. The Abyss (MR22) first stage incorporates the DFC system on the preferential LP port for the primary second stage, whereasthe operation of the other low pressure ports (for octopus, inflator, etc.) is standard.

CWD KitFor particularly demanding conditions, such as professional use in cold or contaminated water, the Abyss (MR22) first stage can be retrofittedwith the CWD kit which completely seals off all first stage internal components from contact with the water. The CWD kit should only beinstalled by an authorized MARES service centre.

Abyss second stageAbyss second stage, with its V.A.D. system, is made of nickel and chrome-plated brass. This material offers a number of benefits:absolute ruggedness and thinner walls, hence compact dimensions obtained without using smaller-diameter diaphragms; this results inreduced water drag.Anti-freeze function, which is enhanced by the "radiator action" of the metal.The second stage coverplate features the new "turbo flow" system for water inflow and outflow, which provides a further performanceimprovement. Furthermore, the compact and ergonomic exhaust tee ensures superior hydrodynamic performance and reduced exhalationresistance.The mouthpiece is made of soft hypoallergenic silicone: limiting jaw fatigue and offering a secure fit even after very long dives.

� WARNING

For safety reasons, the submersible pressure gauge / high pressure safety device that is assembled on the regulator mustcomply with the EN 250: 2000 standard. According to this regulation, with an upstream pressure of 100 bar the maximumpermitted airflow through the connector toward the first stage must not exceed 100 liters/min. If you have a submersiblepressure gauge / high pressure safety device that complies with the EN 250:1993 standard or a different specification,check whether the instruction manual indicates the value of the maximum airflow.The use of submersible pressure gauges / safety devices that do not comply with the EN 250: 2000 standard, or which donot have an indication of the maximum permitted airflow through the first stage connector may result in serious accidents.

� WARNING

For safety reasons, it is not advisable to use an Octopus second stage that is not a certified MARES Octopus. Themanufacturer declines responsibility for damages to persons or property resulting from the use of different Octopussecond stages.The Mares Octopus second stages have been designed and tested for use on first stage low pressure portsOTHER than the preferential port used for the primary second stage. An Octopus second stage MAY NOT be substitutedfor a primary second stage, and must in no circumstances be connected to the preferential low pressure port intended forthe primary second stage.

7

GENERALWORKING PRINCIPLERegulators reduce cylinder pressure, referred to as inlet pressure, to a pressureeeereee suuuuitittititable foooor brrrrr reatatatathihhh ng. Mododododererere nn regulators ddddo to to to to to to tto hihihihhhihih s iss is is nn tn tn tn tn tn tn tn twooowstages connected by a hose. The first stage provides pressure tooo the second sssdd sstttataatt gegeeeeeee; this reduccccedeee presesesessure remains constanananananantttt dt dttt esesesesssspipipipipipipip tetetetetetett tthesizeable changes undergone by the cylinder inlet pressure duuuuriririr ng thththhhe de ive (e (ee (e (droppipipipipipipiing from 3000000/4/4/4/4350 t0 ttttto few hundred pd ppd pd pd pd pppsisissisisisisi).).)))).)) ThThhThThhe seee econdstage brings pressure down to ambient pressure and delivers aaaairririrrirr onlyyy when ththththe divivvvvvvvereee inhales. Eachchchchhh ssstage of theheeeeeee rerereeeereguguguguguguguguulal toor cr cr cr cr crr ccconontains aninternal valve.When the diver inhales, the pressure inside the case is lolololoweeererr d andddd a paaa ressssssure differential (imbalance)e)e)e)))e) isisssssi crcrcrrrreaeaeaeaeaaeaeaeaeatetetetetetetet ddddd ad cross thediaphragm (beginning of inhalation). The response of the diaphragm iss totott beeendndn inwardrdrdrd, c,, onnntatatact the lever and opeeeeeen tn tn tn tnn tn ttnn theheheheheheheee seseseseseecoccocococococcoond stage valve.Air continues to flow into the case until the pressure balance is regained (e(e(e(endn ofofof ini halatitiiiononono ).

FIRST STAGEFor the second stage to work properly, the 1st stage muuuuuust deeeeeliilililiilivevvevevvevev r ar arr arr ir at a ccca cccorrecttt aanaa d --- most importananannnttltlltltltlyyyy -yyyyy cococococooccoonsnsnsnsnssssn tatatatatatatataant intermediate pressure.This characteristic, provided by all MARES first stagessssss, is eeeeeeesssssentialalala for ooobtbtaiaiiaiaininnnn ng optittitiiiimal adjustmennnt ott ot ott of tf tf thehehehehehhee sesesesesesesees cond stage and ensuring topperformance for the entire duration of the dive, regarddllllleeess oooooof tannnkkk presesessusuuuurrer .All MARES first stages are available with the foollllllllllowo inngggg tggg ypesssss ooof taaannnk vallvlvllve fittttttitttt ngs: DIN 477/113 s3 s3 s3 ss3 s3 s3 s3 scrcrcrccccc ewewwewewwww (m(m(mmm(mmmm( aaaxaa pressure 200 bar), DIN 477/50screw (max pressure 300 bar), internationalalala YOYOYOOOOKEKK CCGCCGC A 8500 aada apppteteteter (r mamamaaaax pressure 232222222 bbbbabb r)), i, i, i,, iin an accordance with the EN 250: 2000standard.

SECOND STAGEThe purpose of the second stage isss totototototoo dedddd liver airirrrrr at ammmmmmbient pressure, only duringngg the inhalllaata ion phase. The diagram of a 2nd stage shown inFig. 4 illustrates its opepeperatitititionooo .WWheeenn the diveeer ir ir ir ir iinhnhnhnnhnhhaleeeese , the prpppp essure inside the seconnndd sdd tage deeeecreases, creating a pressure difference (imbalance)between the two sidddiiddes off thththe d aiaphphpphphphhrararararagmgmggg . This pulllllslslslss the fleeeleeeexible diaphragm ininwaw rd, ppprererer ssssssinininggg the demand lever and unseating the second stagevalve.This opening alllllllllowowowooows aaairirir toooo flfff ow in thhhhhrororororougugugugugu h thh he second stssss age and to thththe diverrr, u, u, until the diver stops inhaling. At this point the internal 2nd stagepressure incrrreaeeaasess s, pushhhinininini g the didididiapapapa hragm backkkkk ininininin ththththhthe oe oopppposite directioonn, causing tthe valve to return to its seat and shutting off the airflow.

Abyss (MRMRMRMR22) Firrrststst Stage (e (e (e (e (Fig. 2)The Abyss (M(MMMR2RR 2) diapapaphragm fm fm fffiririrst stagge feee eatures the DFC sssyyystem am aand a replaceable HP seat connector.The high presssurururuure poppeeet wtt as deeeeesissss gned fofooor arrr "2 year or 20000 dives" ssseree vice interval; double the high pressure seat life standard!Compact bbbboodododoo y, in a ma odern an an and smmarararaa t stytytylelele, it is made of hhhot-forgedd nickel-plated and chromed brass.It is fittededdedede withhhh aa paa reefefefefefeererr ntial intntntermediaatatataa e pressure pppppporort for cocococonnnnn ececece tttion to the primary second stage, plus 3 other LP ports and 2 HP portswith 7/1111161 " UUNNNNFN thread.The latattttter areeeeee inclined at aa 4aaaa 5° annngglg e to allow a ma mmmmmore rationnnnnann l layout of hoses.

FC Syyyysysy temxcluuuusiss ve MARERERERESSS DFCCCCCCC system featatttatuuru dede oononon the AAbyss (MR22) first stage minimizes the intermediate pressure drop which occcccc

rs dudududuurirrrr ng the inhhhhnhaaalation phaseeeeeee (F( ig. 3). TTTThTTT is phenomenon is all the more marked when higher airflow is demanded of thesystemm susubbstantially reducccccceeesee breathhhhhhiininii g effort and inhalation resistance, especially during deep dives and undddeee

e Abyss (MR22) ffirirst staggge ie ieeee inccnccnccorororooooo porates the DFC system on the preferential LP port for the primary seconnndddthe other loowww pww rer sssuuururure ports (for octopus, inflator, etc.) is standard.

ng cocooondn itioonsnsnsnsnss, such as professional use in cold or contaminated water, the Abyss (MR22) fiompletely seals off all first stage internal components from contact with the water. T

RES service centre.

system, is made of nickel and chrome-plated brass. This materias hence compact dimensions obtained without using sm

he "radiator action" of the metal.w "turbo flow" system for water inflow and

onomic exhaust tee ensures superior

limiting jaw fatigue and of

� WARNING

s, the submersible pressure gauge / high pressure safety device that is assemmmmblblbblblblbblededededededeede one EN 250: 2000 standard. According to this regulation, with an upstream presssssssus re of 1011010101000

flow through the connector toward the first stage must not exceed 100 literssssssss///m// innnnnnn IIII. If yf yf yf yf yf yyyyouoooo hahahahavevvgauge / high pressure safety device that complies with the EN 250:1993 stanndndndnndn arrrrrrarrddd odd r a didididifffff erenennnt st st stt

hether the instruction manual indicates the value of the maximum airflow.se of submersible pressure gauges / safety devices that do not comply with the Ee Ee Ee EN 2255550505055 : 2000 standdddararara d, ooooro www

have an indication of the maximum permitted airflow through the first stage connectorororor may ry ry result in seriooooouuuus acciidedede

� WARNING

use an Octopus second stager damages to persons or property re

cond stages have been designed and testedsed for the primary second stage. An Octopus s

must in no circumstances be connected to the prefere

8

V.A.D. SystemThe Abyss second stages features the exclusive V.A.D. (Vortex Assisted Design) system, patented by MARES. This system, whichensures low inhalation effort at all depths, uses a by-pass tube to route the air coming in from the hose through the second stage valvedirectly into the mouthpiece (Fig. 4). Inside the mouthpiece, the air takes on a "vortex" flow pattern, a the centre of which a low pressurezone is formed. This low pressure contributes to keeping the second stage diaphragm flexed during the inhalation phase, therebyincreasing the sensitivity of the regulator.

Abyss OctopusThe second stage of the Octopus version is equipped with a hose of considerable length (100cm (39in.)) to facilitate use by a divingcompanion if necessary. It is immediately identifiable in any condition by its yellow color.

OPERATION AND MAINTENANCE

Connecting the hoses to the first stageThe hoses and accessories should be connected in such a way as to avoid damaging the O-ring. Use a suitable wrench to remove theplug from the first stage port, and screw the terminal fitting of the hose firmly but gently into the first stage port.

PRE-DIVE OPERATING INSTRUCTIONS- Ensure that all the hoses have been correctly assembled onto the first stage, and check them for cuts, signs of wear or other damage. If

the hoses are loose enough to be unscrewed manually, they must be tightened with a wrench before being pressurised.- Make sure that the first and second stages do not show signs of damage.- Position the tank control valve so that the valve opening is directed towards the diver.- Remove the dust cap from the regulator yoke and position the A-clamp or DIN fitting so that it is centered on the tank valve opening.- The first stage should be oriented in such a way that the hose leading to the second stage is routed over the diver's right shoulder (Fig. 5).- Tighten the yoke nut finger tight only, being careful not to damage the O-Ring on the tank valve.- Check the submersible pressure gauge, making sure that the pressure reading is zero.- Very slowly open the tank valve, allowing air to enter the regulator gradually.- Do not turn the first stage connected to the tank when the system is pressurized!

� WARNING

The regulator in and of itself is not a complete SCUBA unit, but only one of its components. Under the EN 250: 2000standard, a complete SCUBA unit must include at least the following minimum equipment:

a) Air tank(s).b) Regulator.c) Safety device, e.g. pressure gauge/computer, reserve mechanism or alarm.d) Transport and retaining system, e.g. backpack and/or straps.e) Facepiece (mouthpiece assembly or full-face mask or diving helmet).f) User instructions.

Your MARES regulator has been designed for use in conjunction with other SCUBA unit components conforming to theEEC/89/686 directive and certified with the EC mark. The air inside the tanks must conform to the requirements forbreathable air set out in EN12021.

BEFORE ASSEMBLING THE COMPONENTS OF YOUR SCUBA UNIT, CAREFULLY READ ALL THE USER INSTRUCTIONSAND ANYWARNINGSWHICHTHEY CONTAIN.

� WARNING

DO NOT attempt to use your regulator unless you have performed all of these pre-dive operating procedures. Failure to doso may lead to serious injury or death if the regulator malfunctions.

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OPERERRRRRATIIIIOII N AN AN ANDDD MAMAMAMAMAINNNNNNTET NANCE

Connecting the hhooosoo es tooo the fffe ffiririririrrstsstststst stageThe hoses and accesesesssssssorieseses shshshshould be cococococoonnnnnnnnnn ected in succccch ah way as tttooo avoiddd dadd maging the O-ring. Use a suitable wrench to remove theplug from the fee ffiririrstss stage pppe pport, andd sd sd crew the terrmimimimimmim nannananan l fffitititttting of the hososse firmly buuut gently into the first stage port.

NSTRUCTIONSeen correctly assembled onto the first stage, and check them for c

unscrewed manually, they must be tightened with a wrench beages do not show signs of damage.

e valve opening is directed towards the diver.ke and position the A-clamp or DIN fitting so t

y that the hose leading to the second staul not to damage the O-Ring on th

re that the pressure reading ihe regulator gradually.

e system is press

��� WWWWARRRNNNNIIINNNG

The regggeggeguululululator in and ooof itself if if iiis nss ototot a complete SSSCCUC BA unnnit, but only one of its components. Under the EN 250: 2000standadadadd rd, aaaaaa cocompmpmpmpmplell te SCCUBUBUBA uniiit mt mt mttt ust includee ata leasasasst ttt hee fofofollowing minimum equipment:

a))))) Airr ttr ank(s).b)b))))) Reggggugg lator.c))))) Safeeeetyttyty device, eeeeee.ggg. p. p. p. p. prereressure gauge/ccccomooooo puter,,,,, rer serve mechanism or alarm.d) Transppppororororoort at at at andndndndnd retatatatatat ining systeem,m,m,m,m, e.ee g. bababaaackcckckckckpapapapapapaaack and/or straps.) FFaFaFacepiece (moututtutthpiece assesesess mbbly oooror full-face mask or diving helmet).

Userererererr ininininiininstruuructcctctctctioioiooions.RES regulator has beennnn dnn esigneeeeeedd for use in conjunction with other SCUBA unit components conforrrmmm

6 directive andndnddd cececececeec rtr ified wd wd wd wdd wd witiititititti hhh the EC mark. The air inside the tanks must conform to the requset out innn Enn N120222122 .

LINGGGGG THE CCCOOOOMO PONENTS OF YOUR SCUBA UNIT, CAREFULLY READ ALL THE USSWHHHHICICICICICHTHHTHTHTH HEY CONTAIN.

��� WWWWWWAAAAAARRNNNIIIIING

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9

- Check the submersible pressure gauge, making sure that it indicates the expected tank pressure and that this pressure is sufficient forthe planned dive.

- Check for any leaks in the connection between the tank and regulator. If a leak is found, it may be due to incorrect assembly of theregulator on the tank valve, or to a damaged O-ring inside the tank valve.

- To ensure that the air delivery of the regulator is correct, first exhale through the mouthpiece to expel any impurities from the secondstage, then inhale. Repeating these actions a few times will allow you to quickly identify any major problems.

DURINGTHE DIVEWhen the regulator is not in the diver's mouth, free-flowing may occur. This problem can be easily eliminated by turning the regulatorupside down and filling it with water (Fig. 7). If the regulator continues free-flowing, the dive should be interrupted.

AFTER-DIVE OPERATIONS - MAINTENANCEYour regulator should ideally be rinsed with fresh water when it is still pressurized. This allows the second stage to be thoroughly washedwithout introducing any impurities into its important sealing components. Rinse the first stage, and also run water into the second stagemouthpiece and out through the exhaust ports. If the regulator is not pressurized, do not press the purge valve during washing. Pressingthe purge valve would allow impurities to enter the valve seat, which might give rise to leaks. To prevent contamination of the filter and firststage, do not allow water to enter the air inlet of the first stage. Place the dust cap on the first stage filter and secure it with the yoke nut(Fig. 8). Allow the regulator to dry completely before putting it away. If the regulator is stored for prolonged periods in environments that aregreasy, dusty or exposed to direct sunlight, some of its components might be damaged. Lubricants are not necessary, and in fact shouldnot be used in routine maintenance operations.

WARRANTY CARDOn purchasing a MARES regulator you will receive a permanent "Original Owner Identification Card" made of durable plastic. This card isembossed with the model and serial number of your regulator. Write your name and sign in the spaces provided. Keep this card, whichmay be used at any Authorized MARES Service Centre world-wide for servicing the regulator.

� WARNING

The correct operation of your regulator also depends on proper maintenance. It is therefore advisable to have yourregulator serviced at least once a year by an authorized MARES service center. In particular, it is recommended to replacethe first stage valve after 2 years of use or 200 hours of diving. Failure to observe this precaution may result in seriousinjury or death.

� WARNING

Do not use any type of adapter to attempt to connect the low pressure hose to the high pressure port, as this may lead toserious injury.The low pressure components are not constructed to withstand pressures higher than 285 psi.

� WARNING

When opening the air valve, press the purge valve of the second stage.This helps to reduce the impact on the valve (Fig. 6).DO NOT PERFORM THIS OPERATION AT AMBIENT TEMPERATURES BELOW 10°C (50°F). COLDER TEMPERATURES MAYRESULT IN ICING OR FREE-FLOW.

9

ge, making sure that it indicates the expected tank pres

ection between the tank and regulator. If a leak is found, it mayto a damaged O-ring inside the tank valve.

very of the regulator is correct, first exhale through the mouthpiece to expelating these actions a few times will allow you to quickly identify any major problems

INGTHE DIVEWhen the regulator is not in the diver's mouth, free-flowing may occur. This probleeeelemm cm cm ann bebbbeebee easily elelele iminnatatated by turning the reguguugugg lllupside down and filling it with water (Fig. 7). If the regulator continues free-flowingg, t, t, t, t, t,,, the dididididid veveveveveveve shsssssss ouldlddd be interrrrrrrrupuuu ted.dd.d

AFTER-DIVE OPERATIONS - MAINTENANCEYour regulator should ideally be rinsed with fresh water when itt iiisi sttililillll pl ressururururizii ed. TTTTTTTThis allows thee sesss connndnddn stage to be tttttthohohhohohohoororororrorooouguguguguguguggghlllhlh yyy wyyy ashedwithout introducing any impurities into its important sealing comppppooonooo entssststs. Rinseeee thttt e fffffiriiirirstss stage, and aaaaaalslslsll o run wateer ir ir ir iir irr ntntntnntntnntto to to to to tooo tthehhh seseseseseseseeecond stagemouthpiece and out through the exhaust ports. If the regulator is notttt prpp essssuss rized, doddd nooot ptt ress the purge valve dddurrurururuururru inninininining wg wg wg wg wg wg asasasasasasasasa hihihhhihihhing. Pressingthe purge valve would allow impurities to enter the valve seat, which mimimiighghgg t givivive ree ise ttooo lo eakkks.s.s. To prevent contamiinananananaanan tittiititititionononnonoononnon ofofofofofofoo thtththththththt e filter and firststage, do not allow water to enter the air inlet of the first stage. Place the de de de dust cccap on ththththe fe irirssstssss stage filter aandndndndndndn seseseseeeecucuucucccuurereeeere iiiitiii with the yoke nut(Fig. 8). Allow the regulator to dry completely before putting it at at at at awawawawawwaw yyyyy.y IfIfIfIfIf thtt e regggululuu atorrr isisis storeddddd fffor prolonged pepeeepepeerir odododododododods iss is isss n en en en environments that aregreasy, dusty or exposed to direct sunlight, some of its cccoomomponents migiggigigghthhh be dadadadamagegeged.d. Lubricantsssss araraa e ne ne ne ne ne ne ne nototototooo nenenenenenenen cecececeeceeecessssssssssss ary, and in fact shouldnot be used in routine maintenance operations.

WARRANTY CAAAAAARDOn purchasingggg a MARARARRRRESESES rrreguuuulalalalator you wiwiwiwiwiillllllllll rerrererereeceive a pepeerrrmrmr anent "Orrigigiginal Owwwnenn r Identification Card" made of durable plastic. This card isembossed wwwithhh thtt e moddddddeleeee and sseerererial number of yf yf yf yf yyouoouououourrr regulator. Wrir ttee your nammme and sign in the spaces provided. Keep this card, whichmay be ussses d at anynyny Authorrrizizizizized MARRERERES Service Centre world-wide foor srr ervicinnng the regulator.

������� WWWAAARRRRRRNINNNNNNGG

The correct operation of your regulaaata or alalalalallsos dededededepends oooooonnnn pnn ropeeepeper maintenananncecececececececce. I. I. I. IIt it it itt iit it s ts ts ts ts ts ts tthhhehhhh refore advisable to have yourregulator serviced at least once a yearrrr by annn ann uthoooooriririririzezz d MARESESSSS service centeeeer.r.rr.r.r.r.r InInInInInInIn papapapapapapap rtrtiiiicular, it is recommended to replacethe first stage valve after 2 years of usesesesee or 22020202000 hours ofofofofofoff diddidididid viviv ng. Failureee ttoto obobobseseservrvrvrvrvrvrrvrve te teeeeeee his precaution may result in seriousinjury or death.

� WARNING

e any type of adapter to attempt to connect the low pressure hose to the high ph ph pph pph pppreeeesssssssss ure porrrt,t,t,t, as thththhthisisisinjury.The low pressure components are not constructed to withstand pressuuuuuuurrerer s hs hhhhigggggiggher than 285555 psppp i.

� WARNING

valve of the second stage.This hAMBIENT TEMPERATURES BELOW 1