Gardner Denver VS50A - SECTION 9 MINIMUM PRESSURE;CHECK VALVE; MPV Function and Inspection

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13-18-601 Page 29

Blow Down Valve (P) - This (two-way solenoid) device vents compressed air from the air/oil sump.

During compressor operation (e.g., compressors are running or they have temporarily stopped due to line

pressure reaching unload pressure); the blow down valve remains energized (closed) and the air/oil

reservoir remains pressurized. When compressor operation is halted (e.g., by use of the red “STOP”

controller button, by loss of electrical energy, or by a shutdown condition), the valve is de-energized

(normally open state) and the air/oil reservoir is blown down.

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Maintain Compressor Reliability and Performance with Genuine Gardner Denver Compressor Parts and Support Services2
Instructions for Ordering Repair Parts2
Warning - Prohibition - Mandatory Label Information3
Safety Precautions5
Table of Contents6
Index7
List of Illustrations8
Figure 1-1 - Compression Cycle9
Section 1, General Information9
Figure 1-2 - Package Illustration (Air-Cooled) - External Details10
Figure 1-3 - Package Illustration (Air-Cooled) - Internal Details11
Figure 1-4 - Package Illustration (Water-Cooled) - External Details12
Figure 1-5 - Package Illustration (Water-Cooled) - Internal Details13
Section 2, Installation14
Water-Cooled Units15
Figure 2-1 - Typical Compressor Room15
Enclosure16
Auxiliary Air Receiver17
Electrical Wiring18
Figure 2-2 - Package Maximum Current Consumption Summary18
Grounding19
Figure 2-3 - Line Reactor Sizing Recommendations19
Section 3, Starting & Operating Procedures20
Quick Start Guide22
Starting the Unit24
Stopping the Unit25
Section 4, Controls & Instrumentation27
Figure 4-1 - Electrical Enclosure Hardware28
Figure 4-2 - Piping and Instrumentation Illustration31
Figure 4-3 - Wiring Diagram - (Air-Cooled) Single-Stage VS Control32
Figure 4-4 - Wiring Diagram - (Air-Cooled) Single-Stage VS Control33
Figure 4-5 - Wiring Diagram - (Air-Cooled) Single-Stage VS Control34
Figure 4-6 - Wiring Diagram - (Air-Cooled) Single-Stage VS Control35
Figure 4-7 - Wiring Diagram - (Water-Cooled) Single-Stage VS Control36
Figure 4-8 - Wiring Diagram - (Water-Cooled) Single-Stage VS Control37
Figure 4-9 - Wiring Diagram - (Water-Cooled) Single-Stage VS Control38
Figure 4-10 - Wiring Diagram - (Water-Cooled) Single-Stage VS Control39
Section 5, Compressor Lubrication - Separation, Filtration and Controls40
- Addition of Oil between Changes41
- Draining and Cleaning42
- Figure 5-1 - Checking Oil Level43
- Figure 5-2 - Changing Oil Filter43
- Figure 5-3 - Thermostatic Mixing Valve Element44
- Oil Mixing Valve44
- Figure 5-4 - Pressure Dew Point of Compressed Air45
- Figure 5-5 - Changing Oil Coalescing Element47
Section 6 - Heat Exchangers (Oil, Air)48
Figure 6-1 - Air Flow Chart49
Figure 6-2 - Cooler Housing Side Covers50
Figure 6 3 - Water-Cooled Heat Exchanger Coolant Requirements50
Figure 6-4 - Water Control Valve52
Section 7, Air Filter54
Figure 7-1 - Air Filter (Standard)54
Section 8, Shaft Coupling56
Figure 8-1 - Coupling Components56
Figure 8-2 - Coupling Element57
Figure 8-3 - Motor Removal Hardware57
Section 9, Minimum Pressure/Check Valve59
Figure 9-1 - Minimum Discharge Pressure/Check Valve60
Section 10, Inlet Control Valve61
Figure 10-1 - Inlet Control Valve61
Section 11, Pressure Relief Valve63
Section 12, Ventilation Fans, Filters (Electrical Enclosure)65
Section 13, Motor Lubrication66
Section 14, Maintenance Schedule67
- Yearly68
Section 15, Troubleshooting69

Gardner Denver VS50A - SECTION 9 MINIMUM PRESSURE;CHECK VALVE; MPV Function and Inspection

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