JJ-CCR CE Edition User manual

JJ-CCR ApS 2017
www.JJ-CCR.com
2017 JJ-CCR ApS – 2.00 / Revision 06
1
USER INSTRUCTIONS
JJ-CCR Rebreather
(Version 2.00 / Revision 06)
Reproduction and changes of this document and its content is prohibited without
written approval from JJ-CCR ApS.
All information in this document has been carefully analyzed and is believed to be accurate.
However, it is not possible to guarantee its accuracy and all liability is excluded. Cited companies
and/ or product names are trademarks belonging to the respective companies.
Photography copyright: Sami Paakkarinen 2012
DiveCAN
®

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General cautionary notes and warnings
• Never use the JJ-CCR Rebreather without receiving specific equipment training
(basic course or crossover). It is essential receiving training from a factory ap-
proved instructor and from a factory approved training agency.
• These user instructions do not replace training with the equipment and are not
directions for diving with closed circuit equipment.
• As with other equipment, it is possible that a Rebreather may fail at any time!
It is therefore essential that an autonomous bailout system, independent of the
equipment, be taken by the diver on every dive. The bailout system must be
configured such that the dive can be terminated without difficulty in the event
of a malfunction.
• Your knowledge and practical exercises are the best prerequisites for avoiding
accidents.
• Modifications to the equipment result in the CE being voided immediately and it
is no longer possible to guarantee a safe dive. This is also the case in the event
of a failure to observe the service and maintenance intervals.
• Modifications to the equipment result in the warranty being invalidated. If mod-
ified equipment and/or parts are returned for repairs or maintenance then the
equipment will be restored to its original format in the factory. Any parts and
work required in order to do so will be billed for.
• Replacement parts, repairs and maintenance may only be carried out / shall only
be supplied if the owner is able to provide verification that he possesses the
requisite equipment-specific training.
• It is highly recommended that the user take the time to read through these user
instructions in full.
• If you do not concur with the warnings provided then you should not dive with
a JJ-CCR Rebreather.

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1 Table of contents
1 Table of contents 3
1.1 Revisions and changes in documentation 7
1.2 Manufacturer 7
1.3 EC type examination 7
2 Introduction 8
3 JJ-CCR overview 9
3.1 JJ-CCR Scope of functionality 9
3.2 Technical specifications 10
3.2.1 Vertical head down position 11
3.2.2 Temperature conditions 11
3.2.3 Work rates 11
3.2.4 High-pressure oxygen 11
3.2.5 Expected inspired gas concentrations 12
3.2.6 Visibility 12
3.2.7 Use of high oxygen content gases 12
3.2.8 Potential long term health effects 12
4 Assembly of the JJ-CCR 13
4.1 Base unit 13
4.2 Handle 14
4.3 Stand 14
4.3.1 Attaching the stand to the base unit 15
4.4 1st stages and hoses 16
4.5 Wing 17
4.6 Back-mounted counter lungs (BMCL) 17
4.7 Backplate and harness 18
4.7.1 Adjust the harness 19
4.8 Connecting the supplemental valves 20
4.9 Connecting the ADV 21
4.10 Connecting the wing inflator 21
4.11 Soda lime canister (axial) 22
4.12 Soda lime canister (radial) 23
4.13 Lid 24
4.14 Breathing hose with DSV (Dive Surface Valve) 26
5 Main components 27
5.1 Lid 27
5.1.1 Battery compartment 27
5.1.2 Oxygen sensors 28
5.1.3 Solenoid 28
5.1.4 Breathing hoses 28
5.2 Controller 29
5.3 HUD (Head Up Display) 29
5.3.1 Overview 30
5.3.2 PPO2 Display 31
5.3.3 Basic Commands 32

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5.3.4 Turning On 32
5.3.5 Entering Commands 32
5.3.6 Turn-Off Command 33
5.3.7 Calibrate PPO2 Command 33
5.3.8 Alarm and Error messages 34
5.3.9 Advanced Options 35
5.3.10 Color Blind Code 36
5.3.11 Flip orientation 36
5.4 ADV (Automatic Diluent Valve) 37
5.5 Manual supplemental oxygen valve 37
5.6 Manual supplemental diluent valve 37
5.7 DSV (Dive Surface Valve) 37
6 Controller 38
6.1 Overview 38
6.2 Functionality 39
6.3 DiveCAN Architecture 40
6.4 Turning on the controller 41
6.5 Left and right buttons 41
6.5.1 Left (MENU) 41
6.5.2 Right (SELECT) 42
6.5.3 Overview of the button functions 42
6.6 The main display 43
6.7 Compass 46
6.7.1 Mark Heading (Compass) 47
6.8 Menu structure 48
6.9 Menu reference 49
6.10 Turn Off 49
6.11 Calibrate (calibration of the O2 sensors) 50
6.11.1 PPO2 monitoring 51
6.11.2 Checking calibration during a dive 52
6.12 End Dive 52
6.13 Switch Setpoint 52
6.14 Select Gas 53
6.15 Switch CC/BO (Between Closed and Open Circuit Bailout Mode) 54
6.16 Dive Setup 54
6.16.1 Low SP (Low Setpoint) 55
6.16.2 High SP (High Setpoint) 55
6.16.3 Define Gas 56
6.16.4 Dive Planner 58
6.16.5 Conserv. 61
6.16.6 NDL Display (GF99, CEIL, NDL, @+5 or ∆+5 display) 62
6.16.7 Brightness 63
6.17 Start Bluetooth 64
6.18 Dive Log 64
6.18.1 Display Log / Edit Log 64
6.18.2 Next Log 66
6.18.3 Restore Mode Off 66
6.18.4 Delete All Logs 66
6.19 Setpoint -> .19 67
6.20 System Setup 67

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6.20.1 Mode Setup 68
6.20.2 Salinity (Mode Setup) 68
6.20.3 Low Setpoint (Mode Setup) 68
6.20.4 High Setpoint (Mode Setup) 69
6.20.5 Deco Setup (Overview) 69
6.20.6 Conserv. (Deco Setup) 69
6.20.7 Last Stop (Deco Setup) 70
6.20.8 NDL Display (Deco Setup) 70
6.20.9 BO Gases 71
6.20.10 CC Gases 72
6.20.11 O2 Setup (Overview) 73
6.20.12 Cal. FO2 (O2 Setup) 73
6.20.13 Sensor Disp (O2 Setup) 74
6.20.14 Auto SP Switch 74
6.20.15 Display Setup (Overview) 76
6.20.16 Depth Units (Display Setup) 76
6.20.17 Temp. Units (Display Setup) 76
6.20.18 Brightness (Display Setup) 76
6.20.19 Altitude (Display Setup) 77
6.20.20 Flip Screen (Display Setup) 77
6.20.21 Compass (Overview) 78
6.20.22 Compass View (Compass) 78
6.20.23 Calibrate (Compass) 79
6.20.24 True North (Compass) 79
6.20.25 System Setup (Overview) 79
6.20.26 Date (System Setup) 79
6.20.27 Clock (System Setup) 80
6.20.28 Unlock (System Setup) 80
6.20.29 Reset to Defaults (System Setup) 80
6.20.30 Advanced Config (Overview) 81
6.20.31 System Info (Advanced Config) 81
6.20.32 Battery Info (Advanced Config) 81
6.20.33 Main Color (Advanced Config 1) 82
6.20.34 Title Color (Advanced Config 1) 82
6.20.35 End Dive Delay (Advanced Config 1) 82
6.20.36 Bat Icon (Advanced Config 1) 82
6.20.37 Gas Select (Advanced Config 1) 83
6.20.38 Advanced Config 2 (Overview) 83
6.21 Bus Devices 83
6.21.1 SRI Petrel (Bus Devices) 84
6.21.2 SRI SOLO (Bus Devices) 84
6.22 Info Screens 85
6.23 Alarm, error and info messages 88
6.24 Changing the battery 93
6.24.1 Battery Types 95
6.25 Firmware Update 96
6.26 Step-by-step Firmware Update 96
6.27 Controller Personalization (Start-Up Text) 97

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7 Gas Select (New / Classic) 98
7.1 Gas Select (New Style) 98
7.2 Define Gas (New Style) 99
8 VPM-B / VPM-GFS decompression model 99
8.1 Deco Model 99
8.2 Conserv. (VPM) 100
9 Checklist prior to diving 101
9.1 Preparations on land 101
9.2 Shortly prior to diving 102
9.3 Shortly after entering the water 102
10 Diving 103
11 After the Dive 103
12 Cleaning 103
12.1 “Quick” Cleaning 103
12.2 “Complete” Cleaning 104
13 Storage 104
14 Maintenance 105
14.1 General Care 105
14.2 Maximum Service Life 105
14.3 Approved care products 105
14.4 Care Intervals 106
14.4.1 Prior every dive 106
14.4.2 After every dive 106
14.5 Maintenance Intervals 106
14.5.1 Every 12 months 107
14.5.2 Every 24 months 107
14.5.3 Every 60 Months 107

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1.1 Revisions and changes in documentation
Revision Description Author
00 JJ-CCR Rebreather (DiveCAN®) - CE Edition Dietmar Inäbnit
01
Wrong chapter numbers corrected
Changed the on board gas calculation from 1.0 liter oxygen
consumption to 1.78 (EN14143 section 6.6.3)
Added chapter 3.2.1 - “Vertical head down position”
Dietmar Inäbnit
02 Updated for controller firmware v18
Some minor text changes and corrected typo Dietmar Inäbnit
03 Updated for controller firmware v21 Dietmar Inäbnit
04 Updated for controller firmware v27
The compass requires mainboard v3.4.0 or higher Dietmar Inäbnit
05
Updated for controller firmware v44
CE and International Edition user instructions merged into
one document.
Some minor text changes and corrrected typo
Dietmar Inäbnit
06 Some minor text changes and corrected typo Dietmar Inäbnit
1.2 Manufacturer
The JJ-CCR Rebreather is proudly manufactured in Denmark by:
JJ-CCR ApS, Dyrlevvej 1, 4720 Presto / www.jj-ccr.com
1.3 EC type examination
EC type examination conducted by SGS United Kingdom Ltd, SGS United Kingdom Limited: 202b, Worle
Parkway, Weston-super-Mare, BS22 6WA, United Kingdom. Notified Body 0120.

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2 Introduction
Congratulations on purchasing the JJ-CCR Rebreather. We are certain that you will experience many un-
forgettable dives using this equipment.
The development and testing of the JJ-CCR Rebreather started back in 2006. During this period the equip-
ment was able to demonstrate exceptional reliability over more than 1500 diving hours at a wide range
of locations around the world prior the first public release.
The product development philosophy is aligned with the following criteria:
• Strict application of the KISS principle: ”Keep It Simple Stupid”.
• The Rebreather must be extremely solid, versatile and reliable.
• The Rebreather must be very simple to use, maintain and service.
• The use of easy to obtain parts, enabling on-site repairs at any time.
• The support of a wide range of tank sizes without requiring any special adjustments to the
equipment.
• The supply of fully operational equipment and not basic equipment with numerous different
options.
• The equipment must be configured to include a very high level of redundancy. For example,
separate batteries for the controller, HUD and solenoid. No batteries are permitted within the
circuit. And it must be possible at all times to manually operate the Rebreather in the event
of the controller failing.
• The use of simple and above all reliable electronics. No use of any high tech gimmicks and
strict avoidance of an ”autopilot effect”. The diver retains full control of the Rebreather and
not vice versa.
• Availability of scientific test records in order to verify the equipment performance.
• Always on the search for new ways of further improving the equipment.

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3 JJ-CCR overview
3.1 JJ-CCR Scope of functionality
• Highly robust aluminium housing to which it is possible to secure up to 4 diving tanks
(2 – 12 litre) using conventional tank belts.
• Self-filling soda lime canister (axial).
• Heavy duty stand.
• Integrated handle.
• Back-mounted counter lungs.
• Redundant power supply: One battery for the controller, one battery for the HUD and
two parallel batteries for the solenoid. None of the batteries are integrated into the
circuit.
• Integrated ADV (Automatic Diluent Valve).
• DSV (Dive Surface Valve).
• Manual supplemental O2 and diluent valves with the option of feeding in external
gases.
• Independent HUD (Head Up Display) with real-time display of PPO2 for all three oxygen
sensors.
• Reliable controller with an integrated multi-gas decompression computer (based on the
Shearwater Petrel 2).

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3.2 Technical specifications
Dimensions 70cm x 40cm x 26cm including the handle
Weight 34.2kg – Ready for operation with 2 x 3 litre tanks
19,8kg – Without tanks and soda lime
Soda lime canister
Type: Axial
Soda lime: Average 2.5kg (Sofnolime 797)
Running time: 180 min with dive profile (40 m)
180 min with dive profile (100 m)
Dive profile: 40 min at 40 m, 5 min at 15 m, 9 m
(40 m) for the remaining time
Dive profile: 10 min at 100 m, 1 min at 39 m, 1 min
(100 m) at 36 m, 2 min at 33 m, 2 min at 30 m,
2 min at 27 m, 3 min at 24 m, 4 min at 21 m,
4 min at 18 m, 6 min at 15m, 7 min at 12 m,
10 min at 9 m, 6 m for the remaining time
Test parameter: 40l/min air, 1.6l/min CO2,
4°C water temperature
Used diluent: 40 m - Air
100 m - Trimix 11/65
Soda lime The only supported soda lime is: Sofnolime® 797 manufactured by Molecular
Products.
Oxygen Cylinder 3 Liter steel cylinder (200 bar)
Diluent Cylinder 3 Liter steel cylinder (200 bar)
On board gas duration
Oxygen: The on board oxygen supply will last 252 minutes, if the diver consumes
1.78 liter of oxygen per minute.
3 liter x 200 bar = 600 liter - 25% reserve = 450 liter
Diluent: The duration depends on the depth and activity of the diver.
3 liter x 200 bar = 600 liter
Batteries
2 x 3.6v lithium (SAFT 14500). One battery for the
controller and one battery for the HUD.
2 x 9v block lithium
(Parallel operation for the solenoid)
Volume of the counter lungs 8 litres
Maximum application depth
Max. 40 m with air as diluent
Max. 100 m with trimix as diluent
Warning:
Dives exceeding a depth of 100 m are associated with numerous additional risks
Purity of the gases
Air: DIN EN 12021
Oxygen: >99.5% (medicinal oxygen)
Helium: >99.996
Atmospheric pressure range 800 – 1050mbar

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1st stage ”oxygen” CE Edition - Connection: M26x2 - medium pressure: 7.0 to 7.5 bar
International Edition - Connection: DIN 5/8” - medium pressure: 7.0 to 7.5 bar
1st stage ”diluent” CE Edition - Connection: DIN 5/8”- medium pressure: 9.0 to 10.0 bar
International Edition - Connection: DIN 5/8”- medium pressure: 9.0 to 10.0 bar
Oxygen control Two oxygen setpoints (low and high). Can be switched
as many times as required, also changeable under water.
Oxygen setpoint range From 0.4 to 1.5 bar (low and high)
Oxygen warnings Low 0.4 bar
High 1.6 bar
Oxygen sensors 3 galvanic cells (type: R17JJ-CCR) - Output: 9-13 mV
Shelf live: 3 months / Max. operating life 12 months after installation
Operating temperatures
When diving: +4°C to +34°C
Short-term (air): -10°C to +50°C
Long-term (storage) +5°C to +20°C
3.2.1 Vertical head down position
The JJ-CCR does not meet the requirements of EN 14143 section 5.6.1.4 (Hydrostatic imbalance test)
with a pitch of -90 degrees (Vertical head down position). A vertical head down position during a dive is
an extremely unusual position for a diver and normally never used when not absolutely necessary. Within
a vertical head down position an unintentional activation or freeflow of the ADV can possibly occur. To
avoid it when the diver is forced to a vertical head down position he can close the in line shut-off valve
on the ADV and use the manual diluent adding valve to maintain an optimized loop.
3.2.2 Temperature conditions
The JJ-CCR is intended for use on dives involving low to moderate work rates (E.g. normal recreational
and technical diving activities). Although it is capable of sustaining divers operating with high work rates,
this is not its intended purpose. At higher work rates the divers needs to take into account a reduced en-
durance. This is caused by a higher oxygen consumption and a higher CO2 production which will reduce
the running time of the soda lime. Additionally the diver needs to take into account, that a higher work
rate can have an impact on the decompression and some additional safety margin should be added. Each
body of course is different and reacts differently. Therefore it is not possible to specify exact numbers.
3.2.3 Work rates
The JJ-CCR uses high pressure oxygen as one of its supply gas mixtures. The related parts has been cleaned
and prepared specifically for use with high-pressure oxygen. The diver must taken special care. Especially
when filling the oxygen cylinder. Very important is a proper maintenance and oxygen-compatbile cleanless
for all components exposed to high-pressure oxygen. Service and/or repair work for components exposed
to high-pressure oxygen must be carried out by the manufacturer or by a service centre approved by JJ-
CCR ApS. Failure to comply with these instructions could lead to an oxygen fire and may cause serious
injury or death.
3.2.4 High-pressure oxygen
The operating temperature for the JJ-CCR is between a minimum of 4°Celsius, and a maximum of 34°
Celsius. Operation at temperatures outside of this range may lead to unreliable function.

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3.2.5 Expected inspired gas concentrations
The oxygen setpoint range of the JJ-CCR is from 0.4 to 1.5 bar (low and high). The setpoint range cre-
ates breathing gas mixture representing an inspired oxygen partial pressure between 0.4 bar and 1.5 bar.
The default setpoints are 0.7 (low) and 1.3 (high) and they are user selectable within the listed setpoint
range. The oxygen fraction of the mixture depends upon depth and set point. The following table shows
the oxygen and nitrogen fraction with diluent “Air” and setpoint 0.7 and 1.3 to a depth of 50 meters.
Depth (m) Abs. Pressure (bar) Setpoint PPO2 (bar) O2 (%) ppN2 (Bar) N2 (%)
0 1.0 0.7 0.70 70 0.3 30
3 1.3 1.3 1.3 100 0 0
6 1.6 1.3 1.3 81 0.3 19
10 2.0 1.3 1.3 65 0.7 35
20 3.0 1.3 1.3 43 1.7 57
30 4.0 1.3 1.3 32 2.7 68
40 5.0 1.3 1.3 26 3.7 74
50 6.0 1.3 1.3 21 4.7 79
The nitrogen fraction will vary depending upon the selected diluent for a dive. To reach the maximum
operating depth of 100 meters a trimix diluent is required. Diving deeper than the maximal recreational
depth of 40 meters requires additional training, increases the over all risk and should only be carried out
by trained divers.
3.2.6 Visibility
During a dive it is essential that the diver can read the information from the setpoint controller display
and HUD. Therefore the JJ-CCR should only be used when the visbility in water exceeds approximately
30 centimeters. Using the JJ-CCR in visibility conditions that prohibit viewing of the setpoint controller
display and HUD poses increased risks of operation.
3.2.7 Use of high oxygen content gases
There are no long term studies available for using a rebreather. It is the responsible of the diver to inform
himself of the consequences of CNS, OTU’s and the effect of decompression, emerged in water.
3.2.8 Potential long term health effects
CNS = Central Nervous System Oxygen Toxicity. Oxygen toxicity is a combination of oxygen pressure and
time. The training for the JJ rebreather will cover CNS oxygen toxicity and the NOAA exposure limits.
Prolonged exposure to oxygen in excess of 0.5 bar can lead to pulmonary toxicity, affecting the whole
body. Pulmonary toxicity is tracked using Oxygen Toxicity Units, known as OTUs for short. One OTU is
earned by breathing 100% oxygen at one bar for one minute. The most conservative limit sets a maximum
of 300 OTUs per day for multi day diving trips.

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4 Assembly of the JJ-CCR
This chapter deals with the basic assembly of the JJ-CCR Rebreather. The equipment is fully assembled at
the time of delivery. This chapter is primarily intended to show how the basic assembly takes place. At
the same time, it acts as a guideline for correctly reassembling the equipment if it proves necessary to
disassemble it for any reason (e.g. transportation for a dive trip).
The base unit of the JJ-CCR consists of a highly
stable aluminium housing. The guide rails shown
in the image hold the selected diving tanks in the
correct position and they are also used to attach
the tank belts.
The following image shows how the screw (lock screw M8x30) is inserted in the screw retainer. Both
screw retainer openings are arranged such that an unintentional loosening of a connection will not
result in the base unit falling off. The plastic section of the screw forms a galvanic partition between
the aluminium of the base unit and the rustproof steel of the screw. This prevents corrosion. The wing,
counter lung and back plate are secured on the screws later.
On the front side it is possible to see two screw re-
tainers and a tube on both the right and left hand
side respectively.
4.1 Base unit



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4.2 Handle
The following image shows the handle, which is
screwed into the two tubes on the base unit. The
handle facilitates easy lifting of the JJ-CCR under
all circumstances. The two tubes can be used for
an additional trim weight. Important: Regardless
of whether trim weights are used in the tubes
or not, the overall trim of the JJ-CCR will not
change! The only difference is the required quan-
tity of lead on the diver’s lead belt.
The heavy duty stand is secured to the base plate of the base unit with 4 lock screws. The stand prevents
the JJ-CCR from falling and can also be used as a fastening point for stages, wheels, buoys, etc. whilst
diving.
It is possible to use two types of trim weights.
One can either opt for lead shot or lead bars. If
lead shot is used then it is first necessary to insert
a small piece of sponge into the tubes. This pre-
vents the lead shot from falling out. At the same
time, the sponge allows the water to run out.



4.3 Stand

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4.3.1 Attaching the stand to the base unit
When attaching the stand it is first necessary
to insert the base plate into the base unit from
above. Before inserting the base plate it is nec-
essary to ensure that the sealing surfaces of the
base unit are clean. Carefully check the two base
plate O-rings and re-grease these if necessary.
When doing so, do not use excessive grease but
simply apply a light coating. It must be possible to
insert the base plate without applying force and
without excessive effort.
During the next step the four lock screws are in-
serted into the base plate. Afterwards, attach the
two blocks. An arrow is marked on the base unit
and a notch is visible on the block. These serve
to ensure the correct alignment of the stand. The
stand is now secured. Important: Do not tight-
en the four nuts yet because it is first necessary
to align the stand correctly. The stand is properly
aligned if the arrow on the base unit points pre-
cisely to the notch in the block. It is now possible
to tighten the self-locking nuts. The following im-
age shows the stand correctly attached.






All parts are shown once again here in overview.

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4.4 1st stages and hoses
The next assembly step concerns the 1st stages and hoses (low pressure and high pressure). When de-
veloping the JJ-CCR, extensive value was placed on clear and simple hose guidance. A further primary
objective was to ensure that the equipment was fitted with the minimum possible number of hoses.
The 1st stage with the M26x2 connection and the green pressure gauge is used for oxygen. A low pressure
hose line delivers the oxygen for the solenoid and the second hose is connected with the manual supple-
mental oxygen valve. The oxygen pressure relief valve triggers if the medium pressure rises to 10 bar, and
thereby prevents the hoses from rupturing if, for example, icing up should occur. The 1st stage with the
DIN 5/8” connection and the black pressure gauge is used for diluent. From the 1st stage a hose goes to
a small 3-way manifold. Here, the three hoses are connected with the ADV, manual supplemental diluent
valve and wing inflator. The diluent pressure relief valve triggers if the medium pressure rises to 15 bar,
and thereby prevents the hoses from rupturing if, for example, icing up should occur.

The image to the left shows how the first two stages are connect-
ed to the diving tanks. Arrangement of the high pressure and low
pressure hoses differs! It is very important to ensure that the hoses
are arranged as shown in the image!
The image to the right shows
the correct position of the
3-way manifold, which must
lie flush with the housing.

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4.5 Wing
4.6 Back-mounted counter lungs (BMCL)
The next assembly step concerns the wing. The JJ-
CCR Rebreather is supplied with one wing, which is
optimally tailored to the equipment and has been
specially developed for it. The following image shows
the correct hose arrangement. The two high pressure
hoses must be fed through the lower opening in the
wing. All hoses from the diluent must run through
the upper opening. In the case of the oxygen, it is
only necessary to run the hose for the manual sup-
plemental oxygen valve through the upper opening.
The special position of the pressure gauges is advan-
tageous for a number of reasons. During the pre-dive
check they are very easy to read, whilst their posi-
tion is completely out of the way during the dive. If,
during a dive, it is necessary to check the tank pres-
sure (oxygen or diluent) then it is very easy to reach
both pressure gauges and to pull these forward.
Next, the back-mounted counter lungs are at-
tached. The holes permit attachment of the
back-mounted counter lungs at various heights.
The fast drain valve must be fed
through the loop on the wing.
ATTENTION: Never attempt to lift the equip-
ment using the ADV or T-piece. This can cause
serious damage to the counter lungs!

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4.7 Backplate and harness
The counter lung must be fastened to the harness. The top section of the counter lung is fitted with two
fastening straps with Velcro for this purpose. The Velcro must be opened and one strap must be fed be-
tween the harness and the shoulder padding. The second strap is then used in order to close the Velcro
fastening. The straps with Velcro must not be placed over the shoulder padding!
Counter lung Harness Shoulder padding
A washer and wing nut are attached to the backplate. From time to time it is necessary to check whether
the wing nut requires tightening, or if it has loosened at all.
The following diagram shows the correct fas-
tening of the counter lung to the harness.

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4.7.1 Adjust the harness
The harness is supplied fully assembled together with the back plate. However, it is essential that the
harness is adjusted to the physical dimensions of the diver. The JJ-CCR Rebreather must always sit as high
as possible on the diver’s back. It is also necessary to ensure that the equipment sits as tight to the back
as possible.
The following images show both correct and incorrect adjustment. The right hand image shows the har-
ness following incorrect adjustment, with the equipment sitting too low on the back. The left hand image
shows the harness following correct adjustment, with the equipment sitting in the correct position the
diver’s back.
• The JJ-CCR Rebreather is supplied with an adjustable harness. This enables very simple adjustment when
putting on, and it is also possible to make underwater re-adjustments if necessary.
• A poorly adjusted harness can have an extremely negative effect on the comfort of the wearer during
a dive.
INCORRECTCORRECT

JJ-CCR ApS 2017
www.JJ-CCR.com
2017 JJ-CCR ApS – 2.00 / Revision 06
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4.8 Connecting the supplemental valves
The JJ-CCR comes with two suplemental valves. The oxygen valve enables the manual supply of oxygen
via the t-piece into the breathing circuit. The diluent valve enables the supply of diluent via a second con-
nection on the ADV into the breathing circuit.
Connect the low pressure oxygen hose (inflator connection) with the manual supplemental oxygen valve.
It is recommended that both hoses be fed to the manual supplemental oxygen valve through the D-ring
(see image). In this way the supplemental oxygen valve always remains in the same position, even during
a dive.
Connect the longest low pressure diluent hose (inflator connection) with the the manual supplemental
diluent valve. It is recommended that both hoses be fed to the manual supplemental diluent valve through
the D-ring (see image). In this way the supplemental diluent valve always remains in the same position,
even during a dive.