Table of Contents
UD-series Screw Compressors
vii
2.4.5
Shaft Seal ......................................................................................................... 2-17
2.4.6
Capacity Control ............................................................................................... 2-17
2.4.7
Oil Supply Route ............................................................................................... 2-17
Chapter 3 Installation
3.1 General Installation Precautions ............................................................... 3-1
3.2 Installation Works....................................................................................... 3-1
3.2.1
Unpacking ........................................................................................................... 3-1
3.2.2
Storage ............................................................................................................... 3-1
3.2.3
Transportation ..................................................................................................... 3-1
3.2.4
Preparation for Installation .................................................................................. 3-3
3.2.5
Installation ........................................................................................................... 3-7
3.2.6
Airtightness Test ................................................................................................. 3-9
3.2.7
Vacuuming .......................................................................................................... 3-9
3.2.8
Lubricating Oil Charge ........................................................................................ 3-9
3.2.9
Charge of Refrigerant ......................................................................................... 3-9
3.2.10
Checkout
after Installation
..........................................................................................
3-9
Chapter 4 Compressor and Package Unit Operation
4.1 Lubricating Oil (Refrigerant Oil) ................................................................ 4-1
4.1.1
Precautions for Selecting the Lubricating Oil ...................................................... 4-1
4.1.2
Change of Lubricating Oil Brand......................................................................... 4-2
4.1.3
Precautions for Handling lubricating Oil ............................................................. 4-2
4.1.4
Lubricating Oil Control Criteria ............................................................................ 4-3
4.1.5
Lubricating Oil Replacement Timing ................................................................... 4-4
4.2 Precautions for Operation ......................................................................... 4-5
4.2.1
Prevention of Liquid Flow-back Operation .......................................................... 4-5
4.2.2
Purging of Non Condensable Gases .................................................................. 4-5
4.3 When Stopping the Compressor for a Long Time .................................... 4-6
Chapter 5 Maintenance and Inspection
5.1 Precautions for Maintenance and Inspection ........................................... 5-1
5.2 Maintenance and Inspection List .............................................................. 5-3
5.2.1
Daily Management .............................................................................................. 5-3
5.2.2
Periodic Inspection ............................................................................................. 5-5
5.2.3
Guidelines for the Timing of Compressor Overhaul ........................................... 5-6
5.3 Compressor Disassembly Preparation ..................................................... 5-7
5.3.1
Disassembly Tools and Workplace .................................................................... 5-7
5.3.2
Replacement Parts ............................................................................................. 5-8
5.3.3
Refrigerant Gas Recovery ................................................................................ 5-10
5.3.4
Removal of Connections to the Unit ................................................................. 5-10
5.3.5
Removal of the Compressor from Base Flame ................................................ 5-12
5.3.6
Compressor Disassembly Order....................................................................... 5-13
5.4 Disassembly and Inspection ................................................................... 5-14
