Gardner Denver Screw Air Compressor ESM75

Perform filter mat change as follows:

a) Filter mat, cooling-air inlet

• Remove fixing screws (- 2 - Fig. 27).

• Remove filter mat (- 1 - Fig. 27) and clean, exchange if damaged.

• Re-insert filter mat in sound insulating panel (- 3 - Fig. 27).

• Secure filter mat by means of fixing screws.

b) Filter mat of optional dryer

• Remove fixing screws (-5- Fig. 27) and remove cover plate (-4- Fig. 27).

• Loosen locknuts and remove filter mat of optional dryer (-6- Fig. 27) and clean or, in the case of damage, replace.

Danger: Danger of electric shock! Work on the control cabinet may only be carried out by electrotechnical specialist personnel.

When carrying out adjustment work on the control power transformer, the unit must be electrically isolated and locked off.

Only VS 55-VS 75: Danger of electric shock from loaded condensers! Please always first disconnect the system from the power supply and wait another 10 minutes before touching the electrical components.

Important: A wrong setting of the control-power transformer jeopardizes the trouble-free operation of compressor units and can result in malfunction or damage.

The verification of the control-power transformer setting is a must during commissioning and periodic inspection/ maintenance, as the voltage supply conditions may vary.

The connecting terminals in the switch cabinet have to be checked and, if required, re-tightened during first commissioning and later on in line with the maintenance schedule.

Switch the unit on as described in Chapter 7.4.

Check the control transformer output voltages while operating under load. Several tapping points are provided for this purpose (see circuit diagram).

Switch the unit off as described in Chapter 7.6.

Warning: Only change the oil when the screw compressor unit is out of operation, depressurized, and secured from being switched on again! Be careful when draining hot oil: Danger of scalding!

Important: Remove oil residues and other deposits from unit parts and from the coolers of compressors, which are exposed to hot compressed air, according to the operating instructions.

Note: Collect the waste oil, do not allow it to seep into the ground! Disposal in accordance with the regulations! Do not spill oil! Check for leakage!

With these compressors, the oil change intervals strongly depend on the degree of contamination of the circulating oil.

When changing the oil, the waste oil is to be drained completely, since used oil reduces the service life of the new oil fill considerably.

Do not mix lubricating oils of different makes.

When changing over to a new oil type, the oil in the oil circuit must be drained completely.

For the oil change intervals, see maintenance schedule.

Switch the screw compressor unit off and ensure that it is depressurized, electrically isolate and locked off.

The valve should be tested on a separate compressed air line in accordance with local legislation.

Operate the safety valve (- 1 - Fig. 24), depending on the type of valve:

• Slightly turn the valve cap (-2- Fig. 24) (1-2 turns), and then re-close it.

• Actuation of the bleeding lever/pulling ring

Never operate a screw compressor system with a defective safety valve or without safety valve!;

Warning: Only replace the oil filter cartridge when the screw compressor unit is out of operation, depressurized, and secured from being switched on again! Be careful with hot oil: Danger of scalding!

Note: Dispose of the oil filter cartridge in line with the regulations - special waste! Check for leakage!

Screw compressor unit off and depressurized

Waited at least 5 minutes for the oil to settle and for the air to disperse

Oil filter cartridge unscrewed using an appropriate tool

Oil filter cartridge disposed according to the regulations

Gasket of the new oil filter cartridge slightly oiled

New oil filter cartridge screwed on and tightened manually