Dennerle CarboNIGHT M400, Operating Instructions Manual

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7.3 Checking the CO2 check valve
The check valve protects your valuable pressure reducer or magnet valve against corrosion by returning water. As dirt particles
can settle on the sealing surfaces over time, the check valve should be checked at least once a year and should be replaced
every 2-3 years.
Tip: Temporarily install a transparent test hose between the check valve and the pressure reducer or magnet valve and switch
off the CO2 supply for 24 hours (close pressure reducer or magnet valve). If there is water in the test hose after this time, the
check valve is leaking.
It is only possible to perform a continuity test of the check valve with CO2, as the minimum pressure for opening is approx. 0.3
bar. A „blow through“ test is not possible.
Important note: Only use check valves that are designed for operation with CO2, such as the
Dennerle CO2 special check
valve. Standard air check valves can become brittle through contact with CO2 in a short time, which leads to leakage.
7.4 Replacing the seal in the pressure reducer
There is a long-life seal in the connection piece of the pressure reducer. Replacement during the service life of the pressure
reducer is generally not necessary. The seal can only be replaced with special tools: Please send the pressure reducer to
Dennerle After-Sales Service.
7.5 Replacing the seal in the adapter
We recommend that the seal (part no. 3056) in the adapter for connection to reusable bottles be replaced regularly to ensure a
tight bottle connection at all times.
7.6 Cleaning and recalibrating the needle valve
The hose connection of the pressure reducer contains a factory-calibrated needle valve. If no CO2 extraction is possible
despite the fact that the bottle is full and the control knob is turned all the way open, the needle valve is probably blocked or
misaligned. If this is the case, then:
• Turn the control knob all the way open
• Use the enclosed screwdriver (edge size 2 - 2.5 x 0.5 mm) to turn the valve 1-2 turns counterclockwise and turn the
control knob all the way open to create a CO2 „rinse“. .
CAUTION: Do not fully unscrew the valve! [24]
• Turn the valve back 1-2 turns and set it to approx. 2-3 bubbles/second. Use a piece of hose and a water glass to check the
bubble count. [25]
• The valve is factory-calibrated to approx. 120 bubbles / minute when the control knob is opened all the way. If necessary,
it can be recalibrated by carefully turning it inward or outward in steps of approx. 1/8 turn.
7.7 Removing the CO2 hose
After a long period of operation, the CO2 hose can get very tight on the connection points of the pressure reducer and other CO2
devices. To remove the hose, it is best to lever it off with a small screwdriver. Do not force off or cut open with a knife to avoid
damage to the hose connections! [26]
7.8 Cleaning the CO2 flipper
• Pull the CO2 collection tank straight upwards. [27]
• Place the flipper in your hand so that the suction cups point to the right.
Move the front side wall of the flipper approx. 2 cm upwards. [28]
• Fold out the side wall. [29]
• Extract the CO2 tube, do not pull it out. [30]
• Clean all parts with warm water and a soft sponge. Do not use cleaning agents.
• Reassemble the flipper in reverse order.
CAUTION: Insert the CO2 tube into the side wall so that the end is at the bottom stop.