15
2 Set-up and connection
2.1 Connect the pressure reducer
•
Turn setting knob as far as it will go in direction "-" (CO
2
supply
shut off).
•
Check whether the washer in the connection socket of the pres-
sure reducer and the sealing surface of the cylinder valve are
clean.
•
Screw pressure reducer slowly into place without canting, until a
slight resistance becomes noticeable: This indicates that the pin
in the connection socket of the pressure reducer has established
contact with the cylinder valve. Then swiftly turn the pressure re-
ducer by roughly a further half-turn and tighten finger-tight. A
brief hiss may occur at this point.
Quantum
: The cylinder pressure manometer will now indicate
approx. 60 bar (at 20 °C).
•
The pressure reducer can be unscrewed again at any time – the
cylinder valve closes automatically. A brief hissing sound may
also occur when unscrewing the pressure reducer – it is thus ad-
visable to unscrew the pressure reducer swiftly at the beginning.
2.2 Connect solenoid valve (Special Edition only)
•
Cut a piece of approx. 50 cm in length from the CO
2
hose, ensuring
that the cut is straight.
•
Connect the pressure reducer and solenoid valve with the hose.
IMPORTANT: The arrow on the solenoid valve must point in the
CO
2
flow direction!
•
Slide each end of the hose as far as they will go onto the hose
connectors and fix with coupling rings.
Primus
: Secure hose with clip (to open, push the ends of the clip
apart at the side).
•
The solenoid valve can be secured on the base cabinet with the
aid of the holding bracket.
Connect the solenoid valve to the time switch. The time switch is
used to cut off the CO
2
supply at night, as plants do not consume
any CO
2
during the night.
Tip
: Simply connect the solenoid valve
and lighting to the same time switch.
Control states:
Power ON = solenoid valve open
Power OFF = solenoid valve closed
2.3 Fitting the check valve
•
Cut a piece of approx. 10 cm in length from the CO
2
hose,
ensuring that the cut is straight.
•
Connect the short hose to the entrance of the check valve, and the
long hose to the exit. Slide hoses as far as they will go onto the
hose connectors and fix with coupling rings.
IMPORTANT: The arrow on the check valve must point in the CO
2
flow direction, i.e. from the CO
2
source to the diffusor (Flipper)!
•
Connect the short hose to the pressure reducer
or the sole-
noid valve (for Special Edition)
and secure with coupling ring.
Primus
: Secure hose with clip (to open, push the ends of the clip
apart at the side).
2.4 Connect CO
2
Flipper
•
Rinse Flipper with warm tap water (no detergents!).
•
Moisten the hose connector slightly and fit the CO
2
supply hose.
•
Choose a spot in the aquarium which is as dark as possible (to
prevent algae growth) and where the water movement is good.
•
Fix Flipper in vertical position, at least 5 cm below the surface of
the water.
Your CO
2
fertilizer system is now ready for use.
3 Setting the amount of CO
2
(number of bubbles)
3.1 The right amount of CO
2
For lush plant growth, Dennerle recommends a CO
2
level in the aquarium
of approx.
20 to 25 mg/l
.
Levels of CO
2
above 30 mg/l are not necessary for healthy plant
growth and should be avoided, so as to ensure that fish and other
creatures living in the aquarium are not subjected to any unnecessary
stress. The CO
2
content can be determined by means of the CO
2
long-
term test (see 4) or by measuring carbonate hardness and pH value
(see 4.7).
3.2 Setting the number of bubbles
The required number of bubbles is dependent on various factors, such
as the stock of plants, water movement and lighting intensity. The ap-
propriate CO
2
supply level thus requires to be determined individually
for the specific aquarium concerned.
Rule of thumb for the basic setting:
Begin at approx. 10 bubbles
per minute per 100 l of aquarium water, i.e. 2 x 10 = 20 bubbles per
minute for a 200 l aquarium.
Adjust the CO
2
supply to the desired CO
2
content in small steps spread
over several days. Please note: The more vigorously the surface of
the water is set in motion, the more CO
2
will be expelled from the
aquarium again.
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