Instruction book
2920 1472 03 46
On compressors with an IMD dryer only:
16. Open the valve (customer’s installation) to the air net.
17. Start the compressor and blow off some air from the air net to keep the compressor running
loaded.
18. Slightly open the dryer air inlet valve (7-Fig. 1.5) to pressurize the dryer. Fully open the valve
after pressurizing.
19. Open the regeneration air inlet valve (2-Fig. 1.5) fully. Open dryer air outlet valve (10-Fig. 1.5)
and close by-pass valve (9-Fig. 1.5).
20. Open valve (3-Fig. 3.2a) marked (-) of the U-tube. Slightly open valve (1-Fig. 3.2a) marked
(+), while watching the water levels in the U-tube. Two conditions are possible:
- The water level in the leg marked (+) rises. Close valve (1-Fig. 3.2a) at once, decrease
the regeneration air inlet pressure (see step 21). Do this as often as necessary, until the
water level drops.
- The water level in the leg marked (-) rises, which should normally be the case. If the level
in this leg rises 30 mm above the level in the leg marked (+), close valve (1-Fig. 3.2a) at
once, as there is a risk that the water will be ejected from the U-tube and disappear into
the pressure vessel.
Increase the regeneration air inlet pressure (see step 21) and open valve (1-Fig. 3.2a)
again.
21. Once the water column has stabilized, adjust the pressure differential as follows:
Remove the protecting cap form the adjusting screw (4-Fig. 3.2a), loosen its check nut and
turn the screw in to increase or out to decrease the pressure differential. Tighten the check nut
and reinstall the protection cap.
The average difference between both legs must be 8 ± 3 mm. (Fig. 3.2b) The level in the leg
marked (-) must always be above the level in the leg marked (+). In case of fluctuating water
levels, the average difference can be set at a maximum of 11 mm to keep the level in the leg
marked (-) at any time above the level in the leg marked (+). When the average difference is
set at 11 mm and the level in the leg marked (-) does not stay at any time above the level in
the leg marked (+), consult Atlas Copco.
22. Check the dryer connections for air leaks.
23. Check that the moisture indicator shows blue after approximately 30 minutes of operation.
24. On ZR compressors with IMD dryer: adjust the valve (5-Fig. 3.7) until the air inlet
temperature of the high pressure element is at least 25°C and maximum 30°C higher than the
water inlet temperature. The temperature can be found by taking the difference between two
readings of the Elektronikon: “Element 2 Inlet” and “Cooling Water In”.
25. Open valves (6 and 7-Fig. 3.7).
On ZR Pack compressors and compressors with ID dryer: Adjust the valve (1-Fig. 3.6) of
the oil cooler and intercooler until the temperature drop over this circuit is between 12 to 15°C.
The temperature can be found by taking the difference between two readings of the
Elektronikon: “Cooling Water In” and “Cooling Water IC Out”.
On Pack compressors:
Adjust the valve in the water circuit of the aftercooler (4-Fig. 3.6) until the temperature
difference between air outlet and water inlet is maximum 8°C. This value can be found by
taking the difference between two readings of the Elektronikon: “Compressor Outlet” and
“Cooling Water In”.
On ZR-FF compressors with ID: open the valve (4-Fig. 3.6).
On all compressors:
26. Run the compressor for a few minutes and check that it operates normally.
27. Stop the compressor. If necessary, top up the gear casing with oil to the middle of sight-glass
(SG-Fig. 3.3).
On compressors with an IMD dryer only:
28. Close the blow-off valve of the air net. Close the air outlet valve of the dryer (10-Fig. 1.5).
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