44
HDK-MT350_EN_06
Cleaning muffler
Hazard caused by blocked muffler!
Blocked mufflers can cause a dangerous overpressure to build up which
may cause the mufflers to burst. Flying fragments may cause personal
injury and damage to property.
If the muffler becomes blocked, a dam pressure is generated which in extreme
cases may cause the muffler to burst. A dam pressure can also be noticed by the
increased noise development at the muffler.
► Depressurise the dryer and shut it down (see page 35).
► Remove muffler from solenoid valve block.
► Clean muffler, replace if necessary.
► Fit new muffler in the block and hand-tighten.
► Check that all screw connections are tight.
► If no other maintenance work is to be carried
out: Restart the dryer
(see page 36).
Undo muffler
Replacing inlet/expansion valves V1 - V4
The main valves in the solenoid valve block are wearing parts and should be
replaced every 12 months. Refer to the flow diagram on Page 73 for the layout of
the solenoid valve block.
Note:
We recommend removing the entire solenoid valve block where the
dryer is difficult to access and for quicker maintenance.
In this way the maintenance work can be conveniently performed on a
workbench.
Depending on the installation situation and dryer model, however, it
may be necessary to remove and tilt the entire dryer for this purpose.
Check valve
(RV5)
Expansion
valve (V3)
Check valve
(RV6)
Expansion
valve (V4)
Inlet valves
(V1/V2)
Solenoid valve block
