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UNM STS/STL
GB
ball valve (item 04), open it and drain
used oil completely.
3. Close the mini ball valve.
4. Add the prescribed quantity of oil.
5. Check the oil level, correct if necessary.
Insert the oil filler plug or hose.
6. Dispose of used oil according to applica-
ble regulations.
L
Recommendation: mineral oil Art. No.
B111002, synthetic oil Art. No. B111006.
No guarantee can be provided if the
wrong oils are used.
Do
not
mix synthetic and mineral oil:
compressor damage is possible!
2.6.6 Check screw fittings
1. Check all screw connections for tight fit
and retighten if necessary.
2. Observe the tightening torques (tighten-
ing torques calculated according to VDI
2230).
2.6.7 Cleaning the intake filter
1. Unscrew the intake filter. (Fig. 5a)
2. Clean the filter insert using the blow gun,
exchange the filter insert if necessary.
3. Screw the intake filter back on.
L
Do not purge the intake opening. No for-
eign objects may enter.
Never operate the compressor without an
intake filter.
2.6.8 Clean the silencer insert
On compressors with a silencer:
See instruction manual, part 1.
2.6.9 Checking, setting and adjusting
the V-belt tension
Preparation:
Turn all mounting plugs 45° and remove,
then take off the belt guard grating.
Checking V-belt tension:
Press down on the V-belt at the top using
your thumb, halfway between the V-belt
discs. It may not give more the width of the
V-belt (Figure 7a).
Setting/Adjusting V-belt tension:
See instruction manual, part 1.
2.6.10 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.
2.6.11 Replacing the safety valve
1. Detach the safety valve (item 11) by un-
screwing it anticlockwise.
2. Apply Loctite® 243 to the thread of the
new safety valve or wind Teflon tape
around the valve.
3. Screw the new safety valve into place by
screwing it clockwise.
2.7 Decommissioning
Observe the safety instructions!
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.
1. Replace oil with corrosion inhibitor oil
(viscosity SAE 30). See Chap. 2.6.5.
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 temper-
ature fluctuations.
2.7.2 Disposal
Dispose of the unit and packaging materials
according to applicable regulations.
Summary of Contents for UNM STS 1000-10-270
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