mycom 200VMD User Manual

2205Q2JE-HO-S6-N_2020.01.
Table of Contents
SCV-series Screw Compressors
ix
5.4.7 Suction Cover and Side Bearings ..................................................................... 5-26
5.4.7.1 Disassembly ............................................................................................ 5-26
5.4.7.2 Inspection .................................................................................................. 5-27
5.4.8 Thrust Bearing Block ........................................................................................ 5-28
5.4.8.1 Disassembly ............................................................................................ 5-28
5.4.8.2 Inspection .................................................................................................. 5-29
5.4.9 Rotors and Main Rotor Casing ......................................................................... 5-30
5.4.9.1 Disassembly ............................................................................................ 5-30
5.4.3.2 Inspection .................................................................................................. 5-30
5.4.10 Variable Vi Auxiliary Slide Valve and Unloader Slide Valve ............................. 5-31
5.4.10.1 Disassembly ............................................................................................ 5-31
5.4.10.2 Inspection .................................................................................................. 5-32
5.4.11 Bearing Head and Main Bearings ..................................................................... 5-33
5.4.11.1 Disassembly ............................................................................................ 5-33
5.4.11.2 Inspection .................................................................................................. 5-33
5.5 Reassembly .............................................................................................. 5-34
5.5.1 Bearing Head and Main Bearings ..................................................................... 5-35
5.5.2 Unloader Slide Valve ........................................................................................ 5-36
5.5.3 Installing the Rotors .......................................................................................... 5-37
5.5.4 Suction Cover and Side Bearings ................................................................... 5-38
5.5.5 Balance Piston Sleeve ...................................................................................... 5-38
5.5.6 Installing the Suction Cover .............................................................................. 5-39
5.5.7 Thrust Bearing Block ........................................................................................ 5-40
5.5.7.1 End Clearance Measurement ................................................................... 5-42
5.5.7.2 End Clearance Adjustment Procedure ...................................................... 5-43
5.5.7.3 Tightening after Finishing the End Clearance Adjustment ........................ 5-44
5.5.7.4 Installing the Balance Piston ..................................................................... 5-44
5.5.8 Balance Piston Cover and Unloader Cylinder .................................................. 5-45
5.5.9 Unloader Cover ................................................................................................. 5-48
5.5.10 Bearing Cover ................................................................................................... 5-49
5.5.11 Shaft Seal Block................................................................................................ 5-50
5.5.12 Unloader Indicator ............................................................................................ 5-53
5.5.12.1 Potentiometer ............................................................................................ 5-53
5.5.12.2 Micro-switches and Micro-switch Cam ...................................................... 5-54
5.5.12.3 Reassembly............................................................................................... 5-54
Chapter 6 Troubleshooting
01: Compressor does not start up.................................................................................... 6-1
02: Compressor stops immediately after startup ............................................................. 6-1
03: Abnormally low pressure ............................................................................................ 6-2
04: Low oil-supply pressure ............................................................................................. 6-2
05: Abnormal high pressure. ............................................................................................ 6-3
06: Abnormally high discharge temperature .................................................................... 6-4
07: Leak from mechanical seal ........................................................................................ 6-5
08: Squeaking sound from mechanical seal part ............................................................. 6-6
09: Faulty indication of capacity control position ............................................................. 6-7
10: Capacity control malfunction ...................................................................................... 6-7
11: Compressor generates abnormal vibration and/or sound ......................................... 6-8

mycom 200VMD Specifications

General

Brand	mycom
Model	200VMD
Category	Air Compressor
Language	English