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| User Manual
Maintenance and repair of the dryer
K-MT 1-8/D3
39
Replace solenoid valves
Solenoid valves are wear parts and must thus be replaced every 48 months, even if no dam-
age is visible.
Release pressure from dryer and shut down
the unit (see page 31 ).
Preparation for the replacement of all four
solenoid valves:
Check the specifi cations of the valves:
— The rated voltage of the solenoids (1) must
correspond to that indicated on the type plate
of the dryer.
— Solenoid valves Y1/Y2 at the dryer rear
must be open when not energised (valve piston
without notch, 2).
— Solenoid valves Y3/Y4 at the dryer front
must be closed when not energised (valve
piston with notch, 2).
Position the new solenoid valves at the
points at which they are to be mounted in order
to prevent any confusion at a later stage.
For each solenoid valve, proceed as follows:
Remove solenoid valve from the holder (3).
Remove the valve together with the solenoid
and the diaphragm (4).
Insert new diaphragm with guide (4) and
secure it to the holder (3).
Position new solenoid (1) onto the armature
and secure it to the spring bracket (5).
Solenoid valve
If no other maintenance work is to be carried out: Restart the dryer (see page 32
).
Replace perforated plates, demisters and drying agent
To complete the following maintenance tasks, you must dismantle the plates and the vessels.
We therefore recommend that you carry out these tasks together.
Replace upper perforated plates
Perforated plates are fi tted under the check valve plate and over the solenoid valve plate;
these retain the drying agent. If these perforated plates become blocked, a dam pressure
is generated which can cause compressed air fl uctuations in the compressed air system. In
order to remove the upper perforated plates, the check valve plate must be removed.
Risk of falls!
The dryer must not be misused as a climbing aid! The components have not
been designed for such loads and could fracture.
Only use approved climbing aids when disassembling the check valve plate.
