Liberty Systems CCR Liberty User manual

MANUAL
Liberty
LIBERTY USER MANUAL
Date of issue: 14 March 2019; rev. 2.11
CU HW rev.1.4, HS HW rev. 3.0, FW 2.11
Authors: Adam Procháska, Jakub Šimánek, Aleš Procháska
Published by Liberty systems s.r.o., CCRLiberty.com
LIBERTY MANUAL

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Content
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Use of this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Responsibility of the CCR Liberty user . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
System of documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
User support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Depth limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Water temperature limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CO2scrubber duration limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Technical design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.1 Basic schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.2 Dive/surface valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.1 Inhalation valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.2 Exhalation valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.2.3 Mouthpiece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.2.4 Usage with a full face mask . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.3 Corrugated hoses and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.1 Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.2 Attachment to the head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.3 Connection to the breathing bags . . . . . . . . . . . . . . . . . . . . . . . . . 15
1.3.4 Attachment of the DSV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4 Inhalation bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4.1 Automatic diluent valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1.4.2 Manual diluent bypass valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.5 Exhalation bag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.5.1 Manual oxygen bypass valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
1.5.2 Overpressure valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.6 Oxygen tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.6.1 Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
1.6.2 Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.6.3 Reduction valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.6.4 Pressure reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.7 Diluent tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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1.7.1 Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1.7.2 Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.7.3 Reduction valve and pressure reading . . . . . . . . . . . . . . . . . . . . . . . 20
1.7.4 Backup regulator (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.8 CO2scrubber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
1.9 Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.9.1 Control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
1.9.2 Direct measurement of ppO2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1.9.3 Measurement of He content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
1.9.4 Pressure and depth measurement . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.9.5 Temperature measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.9.6 Solenoids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.9.7 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
1.10 Visual display units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.10.1 Handsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.10.2 Head-up display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.10.3 Buddy display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
1.11 Backplate and mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
1.12 Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
1.13 Buoyancy compensator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.14 Ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
1.15 Weights of individual parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2. Control-unit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.1 Control elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2.1.1 Meanings of inputs in surface modes . . . . . . . . . . . . . . . . . . . . . . . 31
2.1.2 Meanings of inputs in dive modes . . . . . . . . . . . . . . . . . . . . . . . . . 32
2.1.3 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.2 Switching on the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.2.1 Activation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
2.3 Surface mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.3.1 Entering surface mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.3.2 Surface mode primary screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2.3.3 Surface mode O2sensors screen . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.3.4 Switching to other modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
2.3.5 ppO2control in surface mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4 Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
2.4.1 Editor use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.4.2 Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2.4.3 Mixtures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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2.4.4 Decompression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
2.4.5 Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
2.4.6 Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
2.4.7 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
2.4.8 Faulty sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
2.4.9 Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
2.5 Dive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2.5.1 Detailed screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
2.5.2 Synoptic screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2.5.3 Big Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
2.5.4 Dive profile screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2.5.5 Sensors screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
2.5.6 TTS Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
2.6 CCR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
2.6.1 Entering CCR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
2.6.2 Switching to other modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
2.6.3 ppO2regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
2.6.4 Decompression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.6.5 Specific handset control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.7 Manual CCR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.7.1 Entering manual CCR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.7.2 Switching to other modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.7.3 ppO2regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
2.7.4 Decompression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.8 Bailout OC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.8.1 Entering bailout OC mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.8.2 Switching to other modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.8.3 Mixture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
2.8.4 Decompression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.8.5 Specific handset control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.9 Ascent plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
2.10 Setup in Dive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
2.11 Games . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2.11.1 Sokoban . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
2.11.2 Snake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
3. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.1 Dive plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.1.1 Planner settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
3.1.2 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

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3.2 Dive preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.2.1 Replacement of CO2sorbent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3.2.2 Assembling the rebreather body . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3.2.3 Mounting the rebreather body . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
3.2.4 Attaching the counterlungs and hoses . . . . . . . . . . . . . . . . . . . . . . 71
3.2.5 Tank filling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
3.2.6 Battery charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.2.7 Helium sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
3.2.8 Calibration of the oxygen sensors . . . . . . . . . . . . . . . . . . . . . . . . . 75
3.2.9 Preparing the bailout apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . 76
3.2.10 Setting parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
3.2.11 Directional valve check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
3.2.12 Physical inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.3 Pre-dive inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
3.3.1 Internal testing of the control units . . . . . . . . . . . . . . . . . . . . . . . . 78
3.3.2 Pressure sensor test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
3.3.3 Comparison of oxygen sensors and their calibration . . . . . . . . . . . . . . 79
3.3.4 Helium-sensor test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
3.3.5 Battery testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.3.6 Solenoid testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.3.7 HUD inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
3.3.8 BD inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.3.9 Negative pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
3.3.10 Positive pressure test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.3.11 Predive checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
3.3.12 Prebreathe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
3.4 Diving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
3.4.1 Breathing high oxygen content gases . . . . . . . . . . . . . . . . . . . . . . . 85
3.4.2 Putting on the apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
3.4.3 Using the DSV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
3.4.4 Monitoring of devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
3.4.5 Switching to CCR mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
3.4.6 Water entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
3.4.7 Submersion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3.4.8 In-water check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3.4.9 Descent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
3.4.10 Controlling buoyancy and trim . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
3.4.11 Mask clearing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
3.4.12 Increased physical exertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
3.4.13 Ascent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

5
3.5 Post-dive procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
3.5.1 Immediately after surfacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
3.5.2 CO2scrubber maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
3.5.3 Cleaning and disinfection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
3.5.4 Battery care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
3.5.5 Dive log download . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
3.5.6 Long-term storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
3.6 Emergency procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
3.6.1 Emergency ascent (bailout) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
3.6.2 Oxygen-source malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
3.6.3 Diluent-source malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
3.6.4 Scrubber malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
3.6.5 Inadvertent release of the mouthpiece . . . . . . . . . . . . . . . . . . . . . 100
3.6.6 Flooding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
3.6.7 Loss of buoyancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3.6.8 Rescue on the surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3.6.9 Malfunction of oxygen-concentration measuring . . . . . . . . . . . . . . . 102
3.7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.7.1 Tools and replacement parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.7.2 Detection of leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3.7.3 Regular service inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3.7.4 Long-term maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3.7.5 Firmware update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
3.8 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
3.8.1 By car . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
3.8.2 By boat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
3.8.3 By plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

6
Introduction
Use of this manual
This user manual is part of the CCR Liberty documentation.
The CCR Liberty is intended to be used exclusively by a trained person who is capable of fully
understanding the instructions contained in this manual or is in the process of training with
the CCR Liberty in a course accredited by the manufacturer. The initial requirements of such
a training course include qualification for diving with trimix recognized by a training agency
and sufficient experience with technical diving.
Responsibility of the CCR Liberty user
Strong emphasis was placed on reliability during the development of the CCR Liberty. Individual
internal parts are separated in order to minimize the impact that failure of any given part
may have on the rebreather’s basic functionality. A number of systems have multiple backups.
The logic of the CCR Liberty’s control never prohibits the start of a dive even in the event that
malfunctions are detected; it only indicates the status if able to do so in light of the damage.
When cave diving, the inability to submerge can mean not being able to return from a dive;
therefore, the CCR Liberty does not impede submersion.
The user must always decide responsibly whether he/she switches to a backup apparatus or
even starts a dive with a partially malfunctioning rebreather.
A CCR Liberty user must accept the fact that diving involves risk. Following everything that
the user has learned in the CCR Liberty’s technical documentation and in training on diving
with this rebreather can reduce the risk but cannot eliminate it. Safety when diving is further
improved by regular training, methodical education and following good diving practices. Diving
with a rebreather requires a far higher degree of carefulness and discipline than diving with an
open-circuit apparatus.
If you do not accept the risk and you are not a trained, careful and disciplined diver, do not dive
with the CCR Liberty.
The manufacturer does not bear any responsibility for use of the CCR Liberty if the apparatus
has been modified in any way that is not stated in this manual or in the technical guidelines
issued by the manufacturer.

7
System of documentation
Version
The technical documentation is subjected to a process of continual development and
improvement. Therefore, please regularly check the website at www.CCRLiberty.com for
updates.
This manual provides operating instructions for the hardware and software (firmware) version
of the CCR Liberty written on the tittle page.
Technical guidelines
The manufacturer can issue technical guidelines. It is strongly recommended that the user
regularly checks www.CCRLiberty.com for new guidelines. Registered users will receive
notifications by e-mail.
Update of printed documentation
The electronic form of the manual is always available in its complete, updated form.
The electronic and printed forms of the manual may not be completely identical. In case of
insignificant changes (correction of minor typing errors, for example), only the electronic
version is updated.
User support
Registered users are entitled to technical support. The extent of free support can be limited.
The technical support department at Liberty systems s.r.o. will provide limited support for
potential and unregistered users. Prior to submitting a question, please familiarize yourself
with the general principles of rebreather diving with trimix and the freely available CCR Liberty
technical documentation.

8
Technical data
Depth limits
The maximum depth for which The CCR Liberty meets the requirements of the Harmonized
Standard EN 14143:2013 is 100 m.
Diluent Max. depth
Air 40 m
tmx 21/35 66 m
tmx 18/45 78 m
tmx (heliox) 10/90 > 78 m
Additional limitation of depth depends on the used diluent, see 72 Tank filling – Diluent.
The CCR Liberty currently is configured with Apeks Environmentally sealed DST4 1st stages,
the Maximum Operational Depth of the unit with this 1st stage configuration is 170 m. Beyond
170 meters the gas reduction valves ie. 1st stage regulators MUST be replaced with the Apeks
UST4 Environmentally unsealed 1st stage kit.
All components are tested in overpressure 6 MPa (depth 600 m). The depth gauge is checked
and calibrated in overpressure 3.5 MPa (depth 350 m). EC Type-examination was performed to
a 100 m simulated depth.
Water temperature limits
The CCR Liberty is intended for use in water temperatures above 4 °C and below 34 °C
according to the requirements of EN 14143:2013 (Article 5.1).
The minimal temperature is determined through CO2scrubber duration tests, which are done
at 4 °C.
CO2scrubber duration limit
The maximum safe operating period of the sorbent is 168 min, determined by a test in
accordance to EN 14143:2013 (Article 6.6.2). During the test 1.6 l/min of CO2were added to the

9
Date of issue: 29. June 2018
CU HW rev. 1.4, HS HW rev. 3.0, FW 2.11
Authors: Adam Procháska, Jakub Šimánek, Aleš Procháska
Published by Liberty systems s.r.o., CCRLiberty.com
breathing loop with ventilation of 40 l/min in water with temperature 4 °C, exhaled gas with
temperature 32±4 °C, 40 m depth and limit at ppCO25 mBar.
The sorbent’s actual maximum operating period can differ depending on the sorbent,
temperature, depth and the diver’s physical effort.
In normal conditions scrubber duration is considered to range from 4 h in deep cold water with
moderate work to 6 hours for an easy dive. For details see 66 Sorbent service life.
Weight
The total weight of The CCR Liberty, readied for a dive, including fillings, is approx. 37 kg.
For details see 30 Weights of individual parts.
The recommended service intervals are at 1 year, 3 years and 5 years.
The servicing of the unit can only be performed by authorised service technician or technical
centre.
Not performing services at regular intervals may result in voiding your warranty.