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2.6.11 Cleaning/replacing the check
valve
1. Unscrew the locking screw (Figure 6a).
2. Clean insert, replace in case of damage,
squeezing or hardening.
3. Clean seat, replace complete check valve
if damaged.
2.6.12 Replacing the safety valve
1. Unscrew the safety valve (item 11) anti-
clockwise.
2. Apply medium-strength thread-locking
fluid, e.g. Loctite® 243, to the thread of
the new safety valve or wrap Teflon tape
around the valve.
3. Tightly screw the new safety valve in
clockwise.
2.7 Decommissioning
2.7.1
Preservation
Oil-lubricated compressors: compressor is
taken out of service for a long period (over 6
months) or is new from the factory and will
not be operated until much later.
2.8 Troubleshooting
Problem
A Protective
motor
switch
interrupts
power supply
B Pressure relief does
not function
C Compressor
not
start
when
switched on.
D Compressor
starts
up briefly / buzzes
and then switches
off automatically
Cause
In case of malfunctions (e.g.
overheating;
extension cable too long or
with incorrect cross-section),
the protective motor switch is
tripped.
Power failure / undervoltage in
mains
with
switched on
does
Vessel pressure is higher than
switch-on pressure.
Power supply faulty.
Protective motor switch inter-
rupts power supply.
Pressure switch defective
Mains connection cable longer
than permitted or the cross
section is too small
1. Replace oil with corrosion inhibitor oil
(viscosity SAE 30). See Chap. 2.6.7.
2. Allow the compressor to warm up, switch
it off, disconnect the power supply.
3. Drain the condensate, depressurise the
compressor.
4. Prior to returning to operation, replace
corrosion inhibiting oil with compressor
oil.
Store the compressor in a dust-free and dry
area where it is not exposed to high tem-
perature fluctuations.
2.7.2
Environment
Do not dispose of the device in
household waste! Recycle de-
vices, accessories and packaging.
Observe applicable national regu-
lations.
EU only: In accordance with European Di-
rective on waste electrical and electronic
equipment and implementation in national
law, used electric power tools must be col-
lected separately and handed in for environ-
mentally friendly recycling.
Remedy
Switch off the compressor. Wait a
low
voltage;
short while. Actuate the protec-
tive motor switch is available.
Switch on the compressor.
Protective motor switch trips
again: switch off compressor.
Disconnect the power supply.
Contact the service partner
Switch off the compressor. It de-
compressor
pressurises. Switch on the com-
pressor
Relieve pressure in the vessel
until the pressure switch is acti-
vated automatically.
Have the power supply checked
by a qualified person (service
partner).
See item A.
Have
changed by a qualified person.
Check connection cable length
and
Chap. 2.4.4)
UNM / CPM / ZPM
the
pressure
cable
cross-section
GB
switch
(see
II/11
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