Manual - Simply Scuba

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1.1 - MC7 Balanced Diaphragm 1 st stage1.2 - Antifreeze Kit1.3 - AC10 Balanced Piston 1 st stage1.4 - AC2 In-Line Piston 1 st stage
30 FIRST STAGES1.1 - MC7 Balanced Diaphragm 1 st stageThe MC7 Balanced Diaphragm 1 st stage ensures constant performanceunder all sport diving conditions. The unique feature ofthis light and compact balanced system is that it provides consistenthigh performance airflow at all tank pressures and at allsport diving depths. Intermediate pressure remains the same,regardless of tank pressure or depth. Generally, the performanceof regulators deteriorate as tank pressure is reduced or asthe diver descends to a deeper depth. This is not the case withthe MC7 regulator. Performance is maintained, regardless ofpressure and depth. This unique “hyper-balancing” featurewas made possible by an “on line” system and by an accurateinternal surface design. Regulator performance is consistentthroughout the dive, offering top performance at all stages of thedive, as well as during the important critical ascent phase.Within the 1 st stage is a flexible diaphragm (15) that both protectsand seals the internal mechanism, while transmitting water pressurechanges to the high pressure seat (8).For this reason, the MC7 BalancedDiaphragm 1st stage is a betterchoice for diving in water with a highcontent of suspended matter or dissolvedmineral salts. The MC7 balanceddiaphragm 1 st stage is recommendedfor cold water use (withwater temperatures below 10 °C),with the addition of an Antifreeze Kit(20K) (see chapter 1.2). The additionof the Antifreeze Kit ensures that the1 st stage is completely sealed, withfreezing related problems eliminated.MC7 balanced diaphragm first stagefeatures a compact, chrome-platedbrass body with internal componentsfig. 1made of stainless steel, chrome-plated brass, and thermoplasticresins. The first stage is supplied with 4 low pressure (LP) 3/8”ports, arranged at proper angles to avoid interference with otherconnected equipment, and 2 high pressure (HP) 7/16” ports with0.2 mm restricted airflow vents, allowing for maximum safety inthe event of accidental damage to the high pressure hose, thus,resulting in a potential rapid depletion of tank pressure. WARNING: It is necessary to connect either a pressuregauge or a pressure-measuring computer to one of the 1 stStage HP ports. Since cylinders do not feature a reservedevice, an underwater pressure gauge must to be connectedto the regulator 1 st Stage in order to monitor air consumptionwhile diving.Diving without a pressure gauge is dangerous since you cannotcheck air consumption, and should you suddenly run outof air while diving, you can put your life at risk.Air supply into the 1 st stage is protected by a cone shaped sinteredfilter (5K) which retains all impurities from the cylinder andthe valves.The 1 st stage is connected to the cylinder valves by means of aninternational YOKE CGA 850 connection using a newly designedbracket with an advanced engineering concept (2), or by meansof a DIN UNI EN 12209-1-2-3 (21K o 22K) threaded connection incompliance with UNI EN 250:2000 standards. DIN connectionsare recommended when cylinders with more than 200 bar (2900psi) working pressure are used.The adjusting and setting of the intermediate pressure of thisbalanced diaphragm first stage is easy, but requires the serviceof a properly certified technician. WARNING: The intermediate pressure should only beadjusted by Cressi-sub authorized centers. Changing pre-setvalues can affect the proper function of the regulator.
Page 2 and 3: TABLE OF CONTENTS27Introduction . .
Page 6 and 7: FIRST STAGES31The Cressi-sub MC7 Di
Page 8 and 9: FIRST STAGES33Air supply into the f
Page 10 and 11: 351.5 - PerformanceBalanced diaphra
Page 12 and 13: SECOND STAGES372.1 - Second stages
Page 14 and 15: SECOND STAGES39in order not to jeop
Page 16 and 17: SECOND STAGES41To assemble the regu
Page 18 and 19: SECOND STAGES43fig. 18ENGLISHWhen t
Page 20 and 21: SECOND STAGES45als offering outstan
Page 22 and 23: 472.5 - Performance2nd stage Ellips
Page 24 and 25: 49 SECOND STAGES3 - Use and Mainten
Page 26 and 27: 513.4 - Disassembly of the Regulato
Page 28 and 29: Primi StadiFirst StagesPremiers Eta
Page 30 and 31: POS. CODICE / CODE1 HZ 7300272 HZ 7
Page 32 and 33: POS.CODICE / CODE1º Stadio a Pisto
Page 34 and 35: POS. CODICE / CODE1 HZ 8100602 HZ 8
Page 36 and 37: 2º Stadio Ellipse / 2 nd Stage Ell
Page 38: POS.CODICE / CODE1K HZ 780050 Nero1

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