Section 7
43
DHL HEATLESS REGENERATIVE DRYER
MAINTENANCE, TROUBLESHOOTING, SPARES AND DISMANTLING
7.1 CONTROLS AND MAINTENANCE
The maintenance operations must be worked out by qualified personnel.
Before any intervention, verify that:
• No part of the machine is powered and that it cannot be connected to the main
power supply.
• No part of the machine is under pressure and that it cannot be connected to the
compressed air system.
The user that intervenes to the machine must wear hearing protection before to operate into the dryer.
Each employee must select proper PPD (Personal Protection Device) hearing protector (earmuffs, ear
canal caps and earplugs) in order to prevent any uneasiness that could cause dangerous situation for
him.
DAILY
• Check if the inlet filter condensate drain works regularly.
• Check the clogging state of the filters by reading the differential pressure gauge installed.
• Check that the tower switching operation takes place correctly and in the set cycle times.
• Check that the differential pressure gauge, of the regenerating tower, indicates 0 bar.
YEARLY – 3000 HOURS
• Replace the inlet and outlet filter cartridge.
• Clean the silencers or if necessary replace them.
• Check if the regeneration drain solenoid valves (PVA e PVB) work regularly.
• Check if all screws of the electrical wiring are correctly tightened.
• After the checking operating, control the working of the dryer.
EVERY 2 YEARS – 6000 HOURS
In addition to the programmed maintenance, every year:
• Replace the membrane of the regeneration drain solenoid valves (PVA and PVB).
• Replace the techno-polymer of the shuttle spool valves.
• After the control operation, control the working of the dryer.
EVERY 3 YEARS – 9000 HOURS
• Replace the adsorption material. The estimated average life of the adsorption
material is 3-5 years, with 10-minute cycle times and 3000 hours/year in any case
it depends on the quality and temperature of the inlet air and on the correct pro-
grammed maintenance.
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