Maintenance work to be completed every 48 months
46 K-MT1-8_EN_08—2014
Replace solenoid valves
Solenoid valves are wear parts and must thus be replaced every 48 months,
even if no damage is visible.
► Release pressure from dryer and shut down the unit (see page 37).
Preparation for the replacement of all four
solenoid valves:
► Check the specifications 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).
► If no other maintenance work is to be carried out: Restart the dryer (see page
38).
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 fitted 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
fluctuations in the compressed air system. In order to remove the upper
perforated plates, the check valve plate must be removed.
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