Parker Zander WVM 1080, Operating Manual

Page: 41 / 56

EN | Operating manual Maintenance and repair of the dryer
WVM 40 -1450 41
Cleaning
Remove dust with dry cloth; use moist cloth, if necessary.
Clean all surfaces, e.g. at the operating panel, with a moist cloth.
Daily maintenance tasks
Complete visual inspection and function test of the entire dryer
Inspect dryer for visual damage and unusual noises.
If your dryer is not connected to a fault signalling system (see page 28), check whether
there is an error message on the display at the switch cabinet. Assess any existing fault mes-
sages (heed the malfunction table in the controller manual!).
Check whether compressed air has reached the set pressure dewpoint. In units equipped
with dewpoint-dependent control (optional), the dewpoint is shown at the display.
Check dam pressure
If, following depressurisation of a vessel, e.g. after the expansion phase, the overpressure
has not decreased to < 0,5 bar, then there is a residual pressure, designated as dam pres-
sure, in the vessel.
Check for dam pressure: if the dryer functions correctly, the respective pressure gauge
indicates < 0,5 bar. Then there is no dam pressure.
If the dam pressure is greater than < 0,5 bar:
Depressurise the dryer and shut it down (see page „Depressurising and shutting down the
dryer“ 37).
Dam pressure can be caused by:
◊ a blocked muffl er,
◊ a malfunction of the expansion valve,
◊ a leaking pressure build-up valve.
The respective necessary maintenance measures are described in the following sections.
Monthly maintenance
Inspect intake opening for regeneration gas
The regeneration gas is fed to the system through an intake opening at the heater.
Wait until the dryer has reached the stand-by phase (see page „Stand-by-phase (for
dewpoint measurement option)“ 17).
Work with care and do not touch hot surfaces:
— ...After the vacuum pump has stopped, inspect screws at the intake opening and retigh-
ten, if necessary.
— ...Remove dirt from the screen covering the opening, using a suitable tool (e.g. soft wire
brush).
Note:
It is feasible to install an intake fi lter or to supply the regeneration air to the
dryer via an air duct if the ambient air is heavily soiled. Please note the respec-
tive hints in sections Options.
Six-monthly maintenance work
Check the screw and clamp connections
After six months at the latest, all the switch cabinet’s screw and clamp connections must be
checked to ensure that they are secure. The maintenance interval should be reduced in the
case of a vibrating substrate or a vibrating compressor feed line.
De-pressurize the dryer and shut it down (see page 37).