4O-ring Removal (Pinch Method) Pinch Method: Using fingers, push on opposite sides to create protrusionUse only brass or plastic pics to remove o-rings, this will protect delicate seating surfacesNever reuse o-ringsP/n
11Features (Coldwater)The Kronos 2nd stage is EN 250 approved for cold water use when used with the Kronos Supreme model 1st stageDue to the Side-X exhaust, exhaled gases warm the mechanism as it goes through the baffle
12Features (Nitrox)The Kronos is nitrox (EAN) compatible to 40% out of the boxBuilt with a high level of cleanlinessEAN compatible components and lubricantsHave passed required adiabatic compression testing to ensure their safety and compatibility
13Features (Nitrox)Responsibility of the owner to maintain the cleanliness of the regulatorIf regulator will be used interchangeably with breathing air, the air should be oxygen-compatible or “hyper-filtered” whereas the condensed hydrocarbons do not exceed 0.1 mg/m3Grade E air does not necessarily meet this criterionHydrocarbons found in Grade E air can pose a risk in the presence of elevated oxygen content
14Features (Nitrox)Hydrocarbons build up over time along the passageways of the equipmentWhen hydrocarbons come in contact with high-pressure oxygen enriched air, they can pose a very real hazard that can lead to combustionIf a regulator has had use with Grade E breathing air, it should receive a standard overhaul, including ultrasonic cleaning with a detergent solution, that removes hydrocarbons, prior to being put back into nitrox service
15Features (Nitrox)Although second stage components are not exposed to high pressure EAN, Aqualung recommends that the same cleaning procedures be followed for the complete regulatorThis prevents the possibility of cross contamination and guarantees the cleanliness of the entire regulator
42Technician Features No o-ring on valve body New counter-balance chamberNew diaphragm and leverReverse thread on camWrench flats on cam that engage with venturi. This allows venturi adjustment to increase or decrease spring tension (DUAL CAM)Red clip holding venturi in placeSide-X exhaust cannot be completely removed without first removing mp hose
44Cleaning & Lubrication Go directly to Reassembly
45Cleaning Procedures Brass and Stainless Steel Parts Pre-clean in warm soapy water; nylon bristle brushUltrasonically clean with soapy water; vinegar OK on tough corrosionRinse in fresh water; use distilled water if tap water is “hard”Blow dry with lp hydrocarbon free gas (for EAN use)
46Cleaning Procedures Aluminum, Plastic & Rubber Parts ! Soak in warm, soapy waterUse soft nylon bristle brush to remove depositsRinse with fresh waterBlow dry with LP hydrocarbon free gas (for EAN use)CAUTION: DO NOT soak plastic parts in acidic solutions!
47Cleaning Procedures Regulator Hose Hose fittings - Ultrasonically clean with soapy water; vinegar OK on tough corrosionCan run soapy water through hose if neededThoroughly rinse with fresh waterBlow out hose before installing
48Lubrication Procedures Christo-lube MCG 111Light film onlyRemove visible excessIf regulator will be used with EAN, you should wear powderless, latex gloves (or equivalent) when lubricating and handling o-rings
69Adjust Lever Height Attach inline adj tool (p/n 100190) to 2nd stage Attach to a properly adjusted 1st stage or test bench, slowly Pressurize to 3000 psi
70Adjust Lever Height (max) Use the crown/lever toolPlace the tool onto the case in the max position, (larger raised part facing down)Slide tool across lever2nd stage should leak air with this testIf 2nd stage does not leak, lever is to lowRaise lever height by backing out crown slightly and recheck
71Adjust Lever Height (min) Use the crown/lever toolTurn the tool over & place onto the case slide tool across lever2nd stage should not leak air with this testIf 2nd stage does leak, lever is to highLower lever height by turning in crown slightly and recheck
72Set Adjustment ScrewWhile still under pressure, loosen adj screw until small leak is heardTurn adj screw back in 1.5 turnsDepressurize & remove inline toolCAUTION: If no leak is heard, cam was not installed correctly!
85Final TestingAttach 2nd stage to a properly adjusted 1st stage or test bench, slowly pressurize to 3000 psi (232 bar)
86Final Testing Specifications at 2500-3000 psi (160-232 bar) Medium pressure: psi (9-10 bar)Opening effort: in/H2o ( mbar)Opening Effort: in/H2o mbar
87Final Testing Check for leaks Immerse second stage U/W Look for streaming bubbles; don’t mistake trapped air for leaksNote leak source; refer to troubleshooting table in service manualNOTE: Do not confuse bubbles from trapped air with a true leak. If there is an air leak, bubbles will come out in a constant stream.
88This Concludes Servicing Of The Kronos 2nd Stage Rev 07/10/07