View of throttle valve
To start up the unit for the first time or after a long period of standstill, proceed as follows:
1. Check if U-tube is filled halfway with water. If not, continue as follows:
• Close the valves (9 and 10) and open valve (6).
• Remove the plugs (8) of the two vent valves (7) of the delta P indicator and open the valves.
• Fill the U-tube halfway with water, close the valves (7) and refit the plugs.
2. On compressors equipped with a PDP sensor, close valve (11) to this sensor.
3. For dryers with low load option: Check that circuit breaker (F 32, compressor cubicle) is in the "I" position.
4. Close the manual drain valve of the aftercooler drain trap of the compressor.
5. On ZR compressors, check for water flow.
6. Switch on the voltage at the mains.
7. Start and load the compressor.
8. Open the valve (if installed) to the air net or air receiver and blow off some air from the air net to keep
the compressor running loaded.
9. Open valves (9 and 10). Open valve (6) slightly, while monitoring the water levels in the U-tube.
There are two possible conditions:
• The water level in the leg marked (+) rises. Close valve (6) at once, decrease the regeneration air inlet
pressure (see next step). 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 (6) at once, as there is a risk that the
water will escape the U-tube and disappear into the pressure vessel. Increase the regeneration air inlet
pressure (see next step) and open valve (6) again.
10. Once the water column has stabilised, adjust the pressure differential as follows:
• Remove the protective cap from the adjusting screw of throttle valve (12).
• Loosen its check nut (13) and turn the screw to alter the pressure differential.
• Monitor the water level for about 10 minutes.
• Tighten the check nut and reinstall the protective cap.
11. Check the dryer connections for air leaks.
12. On compressors equipped with a PDP sensor, open valve (11) to the PDP sensor 15 minutes after the dryer
is in operation.
Instruction book
106
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