17
5 Care and maintenance
5.1 Replace the CO
2
cylinder
•
The pressure reducer can be unscrewed again at any time – the
cylinder valve closes automatically.
•
Screw pressure reducer onto new disposable CO
2
cylinder (see 2.1).
The
bubble count setting will be retained
.
•
Unscrew the pressure reducer when the cylinder is to remain out
of use for a prolonged period.
5.2 Testing the CO
2
backflow check valve
The check valve protects your valuable pressure reducer/solenoid
valve from corrosion caused by back-flowing water. As dirt particles
may collect on the sealing surfaces over the course of time, the back-
flow check valve should be checked at least once a year and replaced
every 2-3 years for safety's sake.
Tip
: Install a transparent test hose temporarily between backflow
check valve and pressure reducer/solenoid valve and shut down the
CO
2
supply for 24 hours (close pressure reducer/solenoid valve). If
there is water in the test hose after this 24-hour period, this indicates
a leak on the backflow check valve.
The opening of the check valve can only be tested with CO
2
, as a mi-
nimum pressure of approx. 0.3 bar is required to open the valve. It
is not possible to "blow through" the valve with your mouth.
Important note: Use only check valves designed for use with CO
2
, such
as the
special CO
2
check
valve from Dennerle. Standard air check
valves may become brittle through contact with CO
2
within only a short
space of time, resulting in leaks.
Corrosion damage on the pressure reducer/solenoid valve
as a result of water entering into the device is excluded
from the guarantee coverage
.
5.3 Replacing the washer in the pressure reducer
There is a Longlife washer in the connection socket of the pressure reducer.
It is not normally necessary to replace this washer during the service
life of the pressure reducer. The seal can only be replaced using special
tools: Please send in the pressure reducer to Dennerle's Customer Ser-
vice department.
5.4 Cleaning and recalibrating the needle valve
There is a factory-calibrated needle valve in the hose connector of the
pressure reducer.
Should no CO
2
be supplied although the cylinder is full and the setting
knob is turned to fully open position, this indicates that the needle valve
is probably blocked. In this case:
•
Open the valve by turning by one half-turn in anti-clockwise direction
using a fine screwdriver (blade format 2 – 2.5 x 0.5 mm), then
"flush" with CO
2
for a few seconds with the setting knob in fully
open position.
Important: Do not unscrew valve completely!
•
Close valve again by one half-turn.
•
The valve is factory-set to approx. 120 bubbles per minute when
the setting knob is in fully open position. If necessary, it can be
recalibrated by carefully screwing it in or out in steps of approx.
1/8 of a turn.
5.5 Removing the CO
2
hose
After prolonged service, the CO
2
hose may be very firmly attached to
the connector of the pressure reducer and other CO
2
equipment. To
remove the hose, it is best to lever it off using a small screwdriver. Do
not pull the hose off by force or cut it open with a knife, as this may
cause damage to the hose connectors!
5.6 Clean CO
2
Flipper
•
Remove CO
2
collector by pulling straight up.
•
Place the Flipper flat in your hand so that the suction clips are
pointing to the right. Slide front side panel of the Flipper up-
wards by approx. 2 cm.
•
Fold out side panel.
•
Take out CO
2
hose, do not pull out.
•
Clean all parts with warm water and a soft sponge. Do not use
any cleaning agents.
•
Re-assemble Mini-Flipper via the reverse procedure.
IMPORTANT: Insert CO
2
hose in the side panel so that the end is
located at the bottom stop.
27
28
29
32
31
30
Too much CO
2
CO
2
correct
Not enough CO
2
pH
KH 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0 7.1 7.2 7.3 7.4 7.5
2
32
25
20
16
13
10
8
6
5
4
3
3
2
3
48
38
30
24
19
15
12 10
8
6
5
4
3
4
64
51
40
32
25
20
16 13
10
7
6
5
4
5
80
63
50
40
32
25
20 16
13
10
8
6
5
6
96
76
60
48
38
30
24 19
15
12
10
8
6
7
111 89
70
56
44
35
28 22
18
14
11
9
7
8
127 101 80
64
51
40
32 25
20
16
13
10
8
9
143 114 90
72
57
45
36 29
23
18
14
11
9
10
159 126 100 80
63
50
40 32
25
20
16
13
10
11
175 139 111 88
70
55
44 35
28
22
18
14
11
12
191 152 121 96
76
60
48 38
30
24
19
15
12
13
207 164 131 104 82
65
52 41
33
26
21
16
13
14
223 177 141 112 89
70
56 44
35
28
22
18
14
CO
2
-content in mg/l
1-09552_2972_2974_GA_EW_Primus_Quantum_Layout 1 13.08.2014 12:20 Seite 16
