Gardner Denver EBU99E

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13-21-602 Page 37

COMPRESSOR CAPACITY CONTROL - TURN VALVE UNITS ONLY

The capacity of the compressor is controlled by the action of the turn valve and the compressor inlet

valve.

The turn valve controls compressor delivery to match demands of 40% to 100% of the compressor’s

maximum capacity. The inlet valve throttles to control compressor delivery to match demands of 0% to

40% of the compressors maximum capacity.

Example with normal setting of 100 PSIG:

Compressor Delivery

Capacity

Inlet Valve Position Turn Valve Position Discharge Manifold

Pressure (psi)

Full

Open

Closed

100

70%

Open

50% Open

100

40%

Open

Full Open

100

30%

Closing

Full Open

103

20%

Closing

Full Open

103

Closed

Full Open

103

Main Page

Maintain Compressor Reliability and Performance with2
Genuine Gardner Denver Compressor Parts and Support Services2
Instructions for Ordering Repair Parts/Remanufactured Airends2
Warning - Prohibition - Mandatory Label Information3
Safety Precautions5
Table of Contents6
Index7
List of Illustrations9
Section 1, General Information10
Figure 1-1 - Compression Cycle10
Figure 1-2 - Starter Box11
Figure 1-3 - Control Box11
Figure 1-4 - Compressor / Motor Side12
Figure 1-5 - Cooler / Reservoir Side12
Figure 1-6 - Air/Oil Flow Diagram13
Section 2, Installation14
Figure 2-1 - Typical Compressor Room15
Figure 2-2 - Air Flow Chart15
Figure 2-3 - Cold Weather Installation17
Figure 2-4 - Inlet Line Lengths18
Figure 2-5 - Heat Exchanger (Oil Cooler) Approximate Water Flow20
Figure 2-6 - Aftercooler Approximate Water Flow20
Figure 2-7 - Series Piping22
Figure 2-8 - Parallel Piping22
Section 3, Starting & Operating Procedures25
Section 4, Controls & Instrumentation30
Figure 4-1 - Key Pad31
Figure 4-2 - Schematic Tubing Diagram32
Figure 4-3 - Blowdown Valve33
Figure 4-4 - Minmum Discharge Pressure/Check Valve33
Figure 4-5 - Inlet Valve34
Figure 4-6 - Shuttle Valve35
Figure 4-7 - Turn Valve - Electra-Saver Only36
Figure 4-8 - Control Schematic - Compressor Unloaded - Constant Speed Mode39
Figure 4-9 - Control Schematic - Compressor at Full Load - Constant Speed Mode40
Figure 4-10 - Control Schematic - Compressor Unloaded - Low Demand Mode or Auto Mode41
Figure 4-11 - Control Schematic - Compressor at Full Load42
Figure 4-12 - Control Schematic - Compressor Fully Unloaded - Low Demand Mode Switch off43
Figure 4-13- Control Schematic - Compressor Fully Loaded - Low Demand Mode Switch on44
Figure 4-14 - Wiring Diagram - Wye Delta45
Figure 4-15 - Wiring Diagram - Less Starter47
Section 5, Lubrication, Oil Cooler, Oil Filter & Separator49
Figure 5-1 - Dew Point Chart °F51
Figure 5-2 - Dew Point Chart °C51
Figure 5-3 - Flow Diagram - Air/Oil System52
Figure 5-4 - Oil Flow Diagram - Remote Overhead Mounted Cooler53
Figure 5-5 - Cooler Drain Detail54
Figure 5-6 - Oil Level Gauge57
Figure 5-7 - Oil Change Interval58
Figure 5-8 - Approximate Oil System Capacities59
Figure 5-9 - Thermostatic Mixing Valve Element61
Figure 5-10 - Water Control Valve62
Figure 5-11 - Oil Separator64
Section 6, Air Filter67
Figure 6-1 - Heavy Duty Air Filter67
Section 7, Coupling69
Figure 7-1 - Installation of Coupling Cushions69
Section 8, Maintenance Schedule72
Section 9, Troubleshooting74

Gardner Denver EBU99E - Page 38

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