Manual version: 2.15
CU HW rev 1.0
HS HW rev 3.0
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 training course prerequisites are set by cooperating agencies.
Responsibility of the CCR Liberty user
Strong emphasis was placed on reliability during the development of the CCR Liberty. Internal parts are individually separated to minimize the impact that a failure of any given part may have on the rebreather’s basic functionality. Several systems have multiple backups. The logic behind the CCR Liberty is that the controls will never prohibit the start of a dive, even if malfunctions are detected. The system never locks out the diver; instead, the system will indicate the status of the unit in light of any damage if able to do so. 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.
It is always the user’s responsibility to decide whether he/she switches to a backup apparatus or chooses to begin a dive with a partially malfunctioning rebreather.
A CCR Liberty user must accept the fact that diving involves risk. Following everything the user has learned by reading the CCR Liberty’s technical manual and during their training on the rebreather can only reduce the risk. Diver safety is increased through by regular training, methodical education, and following good diving practices. Diving with a rebreather requires a far greater degree of discipline and awareness compared to diving with an open-circuit apparatus.
If you do not accept this 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 the 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.
The technical documents are subjected to a process of continual development and improvement. Therefore, please regularly check the website at divesoft.com for updates.
This manual provides operating instructions for the hardware and software (firmware) version of the CCR Liberty written on the tittle page.
The manufacturer can issue technical guidelines. It is strongly recommended that the user regularly checks divesoft.com for new guidelines. Registered users will receive notifications by e-mail.
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.
Registered users are entitled to technical support. The extent of free support can be limited. The technical support department at Divesoft 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 trimix rebreather diving and the CCR Liberty technical documents available for free
The maximum depth for which the CCR Liberty meets the requirements of the Harmonized Standard EN 14143:2013 is 100 m.
The Liberty rebreather is depth limited at 170m (557ft) due to the use of the Apeks DST4 Environmentally sealed 1st stage regulators. It is recommended that to dive beyond 170M (557ft) the Apeks DST4 1st stages MUST be changed with the Apeks UST4 kit. This does not apply to the Sidemount version, which uses first stages without a dry chamber.
Diluent / Max. depth
tmx (heliox) : 10/90 > 78 m
Additional depth limits depend on the diluent used, see section 3.2.5 Cylinder filling – Diluent.
All components are subjected to a pressure of 6 MPa (depth 600 m). The depth gauge is checked and calibrated to a pressure of 3.5 MPa (depth 350 m). EC Type-examination was performed to a simulated depth of 100 m.
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 CO2 scrubber duration tests, which are performed at 4 °C.
CO2 scrubber 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 CO2 were added to the breathing loop with a ventilation rate of 40 l/min and an exhalation temperature of 32±4 °C; the unit was submerged in 4° C water to a depth of 40 m with a ppCO2 of 5mBar.
The sorbent’s actual maximum operating period can differ depending on the sorbent, temperature, depth, and the diver’s physical effort.
Under normal conditions, scrubber duration ranges from 4 h in deep cold water with moderate work to 6 hours for a minimal working dive. For details see section 3.2.1 Sorbent service life.
The total ready-to-dive weight of The CCR Liberty (including scrubber), is approx. 37 kg.
For details see part 1.15 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.