Maintenance
26
© Lutz-Jesco GmbH 2021
BA-22404-02-V03
Chlorine changeover unit
C 7520
Operating instructions
Position
Description
1
Pressure screw
2
Antistatic ring
3
Pressure ring (metal)
4
Packing
5
Control rod
6
Friction disc (PTFE)
7
Ball seat
8
Ball
9
Housing seal
10
Housing
Tab. 16: Remove the seals in the ball valve
Perform the following working steps:
1.
Turn the control rod as shown in Fig. 17 „Remove the seals in the ball
valve“ on page 25.
2.
Remove the ball seat. To do so, push against the ball with a blunt ob-
ject.
4
Dismantle the ball seats.
3.
Remove the housing seals. Press into the seal with a pointed imple-
ment. Make sure that you do not damage the metal surfaces.
4
Housing seal removed.
4.
Unscrew the pressure screw.
5.
Grip the spanner flat of the control rod in a vice and pull on the hous-
ing until the control rod slides out approx. 1 mm.
6.
Pull on the housing whilst turning it anti-clockwise.
4
A thread in the ball valve interior pushes the control rod and seals
outwards.
7.
Remove the control rod with all seals from the housing. Take account
of the antistatic ring. It is fitted in a depression in the pressure screw.
4
Control rod seals removed.
ü
Seals removed.
12.4.4 Fit new seals
Perform the following working steps:
1.
Clean all parts with warm water or cleaning alcohol. Allow all compo-
nents to dry well.
2.
Check all the sealing surfaces for damage. Do not reuse damaged
parts.
3.
Fit the control rod with the parts 3 – 6 in the housing.
4.
Press the antistatic ring in the recess of the pressure screw and fit
the pressure screw with approx. 10 Nm.
5.
Turn the control rod. Tighten the pressure screw with max. 20 Nm.
4
The control rod has been fitted.
6.
Fit a ball seat in the housing. The 45° chamfer must point towards
the ball (see symbol in Fig. 17). Make sure that the ball seat does not
twist.
7.
Fit the ball in the housing. Turn the control rod so that it can slide into
the ball slot.
8.
Fit the second ball seat.
9.
Fit the housing seals. One side of the seal is flat, the other is slightly
convex. The convex surface of the seal must point outwards (see
symbol in Fig. 17).
ü
Seals fitted.
12.4.5 Assembling the ball valve
Perform the following working steps:
1.
Clean the thread of the four tension rods and oil them lightly.
2.
Fit the flange with the tension rods on the housing. Do not forget the
centring sleeves.
3.
Fit the nuts and tighten them equally by hand.
4.
Tighten the nuts with a tool equally in a number of stages (torque up
to 40 Nm).
4
Ball valve closed.
i
The centring sleeves remain movable even after the screws
have been tightened. They ensure that the housing is centred
between the screw holes.
5.
Hold the ball valve in the wall bracket from below and fit the coupling
piece between the motor and the ball valve. If necessary, correct the
switching position of the ball valve. The display on the motor and the
coupling must point in the direction of the open connection.
6.
Fix the ball valve with the four screws.
7.
Return the pressure gauge cable to the control and reconnect it.
ü
Ball valve fitted.
12.5 Cleaning the pressure gauge
PLEASE NOTE
Damage to pressure gauges
Pressure gauges are measurement devices which are adjusted by spe-
cialists when manufactured. Pressure gauges that have been disas-
sembled must be tested and readjusted by the manufacturer.
ð
Do not dismantle pressure gauges. Pressure gauges are highly
complicated which cannot be emptied entirely.
ð
Do not allow any soiling to enter the pressure gauge.
ð
Do not allow any water to enter the pressure gauge.
