Gardner Denver EAH99C - Figure 4-9 - Control Schematic - Compressor Unloaded - Low Demand Mode or Auto Mode

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Figure 4-9 – CONTROL SCHEMATIC – COMPRESSOR UNLOADED – LOW DEMAND MODE OR AUTO MODE

ERH, EBH, EBM & EBP UNITS ONLY

227ECM797-B

(Ref. Drawing)

Main Page

Maintain Compressor Reliability and Performance with 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 Flow19
Figure 2-6 - Aftercooler Approximate Water Flow20
Figure 2-7 - Series Piping21
Figure 2-8 - Parallel Piping21
Section 3, Starting & Operating Procedures24
Section 4, Controls & Instrumentation27
Figure 4-1 - Schematic Tubing Diagram28
Figure 4-2 - Blowdown Valve29
Figure 4-3 - Minimum Discharge Pressure/Check Valve29
Figure 4-4 - Inlet Valve30
Figure 4-5 - Shuttle Valve31
Figure 4-6 - Turn Valve - Electra-Saver Only32
Figure 4-7 - Control Schematic - Compressor Unloaded - Constant Speed Mode35
Figure 4-8 - Control Schematic - Compressor at Full Load - Constant Speed Mode36
Figure 4-9 - Control Schematic - Compressor Unloaded - Low Demand Mode or Auto Mode37
Figure 4-10 - Control Schematic - Compressor at Full Load38
Figure 4-11 - Control Schematic - Compressor Fully Unloaded - Low Demand Mode Switch off39
Figure 4-12 - Control Schematic - Compressor Fully Loaded - Low Demand Mode Switch on40
Figure 4-13 - Wiring Diagram - Wye Delta41
Figure 4-14 - Wiring Diagram - Full Voltage42
Figure 4-15 - Wiring Diagram - Wye Delta43
Figure 4-16 - Wiring Diagram - Full Voltage44
Section 5, Lubrication, Oil Cooler, Oil Filter & Separator45
Figure 5-1 - Dew Point Chart °F47
Figure 5-2 - Dew Point Chart °C47
Figure 5-3 - Flow Diagram - Air/Oil System48
Figure 5-4 - Oil Flow Diagram - Remote Overhead Mounted Cooler49
Figure 5-5 - Cooler Drain Detail50
Figure 5-6 - Oil Level Gauge53
Figure 5-7 - Oil Change Interval54
Figure 5-8 - Approximate Oil System Capacities55
Figure 5-9 - Thermostatic Mixing Valve Element57
Figure 5-10 - Water Control Valve58
Figure 5-11 - Dew Point Temperature Vs. Ambient Temperature59
Figure 5-12 - Oil Separator60
Section 6, Air Filter64
Figure 6-1 - Heavy Duty Air Filter64
Section 7, Coupling66
Figure 7-1 - Installation of Coupling Cushions66
Section 8, Maintenance Schedule69
Section 9, Troubleshooting71

Gardner Denver EAH99C - Figure 4-9 - Control Schematic - Compressor Unloaded - Low Demand Mode or Auto Mode

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