Diaphragm pump N680 EX
Servicing
Translation of Original Operation and Installation Instruction, english, KNF 325438 02/22
35
Fitting the pump head
1. Insert the two new O-rings (
10
) in the intermediate plate (
18
).
2. Place the head plate (
3
) on the intermediate plate (
18
) according to the
felt-tip pen marking.
3. Finger-tighten the hexagon socket head cap screws (
6
).
4. Place the pump head on the housing according to the felt-tip pen mark-
ing.
5. Screw in the hexagon socket head cap screws (
1
) one to two turns.
6. Tighten the two hexagon socket head cap screws (
6
) (tightening
torque: 4 Nm).
7. Tighten the hexagon socket head cap screws (
1
) crosswise (tightening
torque: 11 Nm).
8. Tighten the hexagon socket head cap screws (
1
) crosswise again until
they are fully tightened (tightening torque: 11 Nm).
9. For two-headed pumps:
Perform steps 1 to 6 for the second pump head.
10. For two-headed pumps:
Mount the pneumatic connection between the pump heads. In doing
so, retighten the union nuts slightly above the original position (as
marked during disassembly, see Fig. 8).
11. Install the motor fan cover (see Chapter
5 Product description and func-
) according to the felt-tip pen marking.
When fitting the motor fan cover, make sure that all of the screws
are fitted again, the fan cover and the fan are undamaged, and the
fan can rotate freely. To do this, perform a function test.
12. Function test
Perform a function test in an non-explosive atmosphere.
– Connect the suction and pressure sides to the pump.
– Electrically connect the pump.
– Test the functionality of the pump.
– Disconnect the pump electrically and pneumatically again.
13. Pump integrated in application
– Connect the suction and pressure sides to the pump.
– Electrically connect the pump.
– Test the functionality of the pump.
To ensure the required gas tightness of the pump following servic-
ing, a leak test is to be performed.
WARNING
Risk of explosion from leaks
à
Before recommissioning the pump, check the
pump heads and pneumatic connections for
leaks. Leaks may lead to a risk of explosion.
