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mycom 3225MSC User Manual
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2202MYJE-
MY
-
C8
-
N_
2018.02.
Chapter 2 Compressor Specifications and Structure
Compound 2-stage Screw Compressor 3225
**C
2.5
Mechanisms
2-
20
(A)
Properly adapted V
i to load condition
(B)
Improperly adapted V
i to load condition
Figure 2-19 Relationship
between V
olume ratio (Vi) and Ope
ration Conditions
Internal
press
ure
Change
i
n
v
ol
u
me
enc
l
os
ed
by
tooth profi
l
e
s
Suc
ti
on
Internal
press
ure
Change
i
n
v
ol
u
me
enc
l
os
ed
by
tooth profi
l
e
s
37
39
Table of Contents
Default Chapter
6
Table of Contents
6
Chapter 1 Safety
11
Strict Requirements and Prohibitions
11
Strict Requirements (Do's)
11
Do's on Operation
11
Do's on Maintenance
11
Do's on Lockout/Tagout after Shutting off the Power
11
Do's about Personal Protective Gear
12
Do's about Handling of Hazardous and Toxic Substances
12
Do's about Handling Emergency Situations
12
Do's about Waste Oil, Fluid, and Materials
12
Other Do's
12
Prohibitions (Don'ts)
13
Warnings
13
Residual Risks
14
Safety Devices
16
Emergency Stop Button
16
Breakers of Motor Main Power and Control Power (with Lockout/Tagout Mechanism)
16
Compressor Protective Devices
17
Chapter 2 Compressor Specifications and Structure
19
Overview of the 3225**C
19
Model Designation of the Compressor
19
Compressor Specifications
20
Standard Specifications
20
Operation Limits
22
Outer Dimensions
23
Structure of Compressor
35
Sectional View
35
Mechanisms
36
Basics of the Screw Compressor
36
Suction Process
36
Compression Process
37
Discharge Process
37
About Volume Ratio (VI)
37
Capacity Control Mechanism
39
Bearings and Balance Piston
39
Shaft Seal Block
39
Gas and Oil Flow
40
Chapter 3 Installation
42
General Precautions for Installation
42
Installation Works
42
Unpacking
42
Storage
42
Transportation
42
Preparation for Installation
45
Installation
46
Shaft Alignment between the Compressor and Driving Machine
46
Piping Connection
47
Equipment and Devices for Protection of the Compressor
47
Airtightness Test
48
Lubricating Oil Charge
48
Initial Charge of Lubricating Oil
48
Additional Charge of Lubricating Oil
48
Charge of Refrigerant
48
Check after Installation
48
Chapter 4 Compressor and Package Unit Operation
49
Lubricating Oil (Refrigerant Oil)
49
Precautions for Selecting the Lubricating Oil
49
Recommended Lubricating Oils
49
Recommended Lubricating Oils for Ammonia Refrigerant
49
Change of Lubricating Oil Brand
51
Precautions for Handling Lubricating Oil
52
Lubricating Oil Management Criteria
53
Lubricating Oil Replacement Timing
54
After Starting the Initial Operation
54
During Normal Operation
54
Precautions for Operation
55
Prevention of Liquid Flow-Back Operation
55
Purging of Non-Condensable Gases
55
When Stopping the Compressor for a Long Time
56
Chapter 5 Maintenance and Inspection
57
Precautions for Maintenance and Inspection
57
Maintenance and Inspection List
59
Daily Management
59
Periodic Inspection
61
Guidelines for the Timing of Compressor Overhaul
62
Compressor Disassembly Preparation
63
Disassembly Tools and Workplace
63
Replacement Parts
64
Refrigerant Gas Recovery
67
Removal of Connections to the Unit
68
Removal and Lifting the Compressor
69
Draining Oil from the Compressor
69
Disassembly and Inspection
70
Unloader Indicator
71
Disassembly
71
Inspection
73
Unloader Cover
74
Disassembly
74
Inspection
75
Unloader Piston and Unloader Cylinder
76
Disassembly
76
Inspection
77
Shaft Seal Block
78
Disassembly
78
Inspection
79
Bearing Cover
80
Disassembly
80
Separating High-Stage and Low-Stage Blocks
81
Disassembly
81
Gear Coupling
81
Inspection
82
Removing Oil Injection Pipe
83
Disassembly
83
Balance Piston
84
Disassembly
84
Inspection
84
High-Stage Suction Cover and Side Bearings
85
Disassembly
85
Inspection
86
Low-Stage Suction Cover and Side Bearings
87
Disassembly
87
Inspection
87
Thrust Bearing Block
88
Disassembly of the Low-Stage Thrust Bearing Block
89
Inspection (High-Stage and Low-Stage)
89
High-Stage Rotors and Main Rotor Casing
90
Disassembly
90
Inspection
91
Low-Stage Rotors and Main Rotor Casing
91
High-Stage Bearing Head and Main Bearings
92
Disassembly
92
Inspection
92
Low-Stage Bearing Head and Main Bearings
93
Disassembly
93
Inspection
93
Reassembly
94
Unloader Slide Valve and Guide Block
96
Bearing Head and Main Bearings
97
Bearing Head and Main Rotor Casing
98
Installing the Rotors
99
Suction Cover and Side Bearings
100
Balance Piston Sleeve
101
Installing the Suction Cover
102
Thrust Bearing Block
104
End Clearance Measurement
106
End Clearance Adjustment Procedure
107
Tightening after Finishing the End Clearance Adjustment
108
Installing the Balance Piston
109
Balance Piston Cover and High-Stage Unloader Cylinder
109
Bearing Cover
112
Shaft Seal Block
113
Low-Stage Unloader Cylinder
116
Unloader Cover
117
Coupling the High-Stage and Low-Stage Blocks
118
Unloader Indicator
120
Potentiometer
120
Micro-Switches and Micro-Switch Cam
120
Reassembly
121
Chapter 6 Troubleshooting
124
01: Compressor Does Not Start up
124
02: Compressor Stops Immediately after Startup
124
03: Unusually Low Pressure (Decrease of Suction Pressure)
125
04: Low Oil Pressure (Low Lubricating Oil Supply Pressure)
125
05: Intermediate Pressure Is Unusually High
126
06: Unusually High Pressure (Abnormal Discharge Pressure)
127
07: Discharge Temperature Is Abnormally High
128
08: Leak from Mechanical Seal
129
09: Squeaking of Mechanical Seal
130
10: Capacity Control Position Is Indicated Incorrectly
130
11: Capacity Control Malfunction
131
12: Compressor Generates Abnormal Vibration And/Or Sound
132
Chapter 7 Related Documents
135
Exploded Views, Assembly Sectional Views
135
Parts Configuration Table
161
Tightening Torques for Bolts and Nuts
168
About the O-Rings Used
170
List of O-Rings Used
170
O-Ring Materials Used for Screw Compressor
170
Tools for Disassembly
171
4
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mycom 3225MSC Specifications
General
Brand
mycom
Model
3225MSC
Category
Compressor
Language
English
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