2.5.1 Basics of the Screw Compressor
The screw compressor is a positive displacement rotary compressor. As shown in Figure 2-3 Compressor Mechanism, the refrigerant (gas) is continuously compressed by changing the volume between the casing and the male and female meshed screw rotors, which have different profiles. The rotor with 4 protruding lobe sections is called the M rotor (male rotor), and the rotor with 6 lobe depressions is called the F rotor (female rotor). Throughout this manual they are referred to as the M rotor and F rotor. The compressor M rotor shaft is driven by the two-pole or four-pole motor via the speed increaser gear.

2.5.2 Suction Process
As shown in Figure 2-4 Suction Process, the rotors’ different profiles mesh together. Also the volume enclosed between the M and F rotor lobes and compressor casing increases from the suction side as the rotors turn. As rotations continue, at a certain point the volume reaches its maximum, the rotors start to trap the gas between the lobes and compressor casing thereby isolating the gas from the suction port.

Figure 2-4 Suction Process
2202L5JE-DA-C5-N_2015.05.2 Compressor Specifications and Structure Compound 2-stage Screw Compressor 2.5 Mechanisms 1612LSC Speed Increaser Type 2-7

2.5.3 Compression Process
As the rotors further rotate, the sealing line between them moves toward the discharge side and the volume between the rotor lobes decreases and compresses the trapped gas. Figure 2-5 Compression Process Figure 2-6 Discharge Process

2.5.4 Discharge Process
Through the compression process, the volume between rotor lobes decreases to a predetermined value at the discharge port. Following rotor rotation, the compressed refrigerant gas is pushed out of the discharge port.

2.5.5 About Volume Ratio (Vi)
Volume ratios (Vi) of C-series screw compressors are indicated in performance tables or catalogs by using port symbols L and M. The volume ratio represented by each symbol is as follows: L=2.63, M=3.65.
Which volume ratio (L or M) should be used is decided according to operating conditions. If the compressor is used with a volume ratio that does not match operating conditions, operation will go inefficiently wasting the power. The relationship between volume ratios and generally used compression ratios is as follows: (Vi) κ= πi = Pd/Ps κ= Cp/Cv of refrigerant gas Vi = designed volume ratio πi = designed compression ratio The constant of the refrigerant gas also a factor, and the Vi value for the compression ratio will change according to the refrigerant gas used.

Figure 2-7 Volume Ratio Explanation
2202L5JE-DA-C5-N_2015.05.2 Compressor Specifications and Structure Compound 2-stage Screw Compressor 2.5 Mechanisms 1612LSC Speed Increaser Type 2-8
(A) When Vi matches operation conditions The required compression ratio and Vi are both low The required compression ratio and Vi are both high
(B) When Vi does not match operation conditions Vi is too low compared to the required compression ratio Vi is too high compared to the required compression ratio Figure 2-8 Relationship between volume ratio (Vi) and operation conditions 2202L5JE-DA-C5-N_2015.05.2 Compressor Specifications and Structure Compound 2-stage Screw Compressor 2.5 Mechanisms 1612LSC Speed Increaser Type 2-9

2.5.6 Capacity Control Mechanism
The capacity control structure involves the moving of a slide valve, bypassing suction gas just before compression on the suction side, which shortens the portion of the rotor used for compression. The slide valve is at the bottom of the casing where the rotors mesh together, and is constructed to move parallel to the rotor’s axis. This movement is changed by a cam mechanism into rotation movement, and as the position (capacity control ratio) is indicated externally, the electrical resistance value changes to provide feedback to the automatic control circuit.

Figure 2-9 Capacity Control Mechanism
The 1612LSC speed increaser type has capacity control on the low-stage block only. 2.5.7 Bearings and Balance Piston For the load created on the rotor perpendicular to the axle, a white metal-lined sleeve-type bearing is used. The bearing uses surface fitted ball bearings with angular contact for loads along the axis direction. In particular, axial load for the M rotor, which has one type of helical gear, is comparatively larger than that of the F rotor because of the thrust load from discharge pressure. This load for the M rotor is reduced by the use of a thrust bearing, along with a balance piston providing opposing hydraulic pressure.

2.5.8 Shaft Seal
To prevent refrigerant gas and oil leakage, a reliable mechanical seal assembly is used for the shaft seal of the speed increaser gear spindle. Mechanical seal assembly is mainly composed of "rotating ring" installed on the rotor shaft and "stationary ring" installed in the seal cover. Rotating ring rotates with the shaft, and slides each other with the stationary ring while maintaining a micron class gap. The sliding each other place is called as the sliding surface. As an example, for the BBSE (Balanced Bellows Single Seal)-type, which is a standard seal currently in use, the fixed ring (mating ring) is cast iron, and the rotating ring is carbon, with an O-ring for the packing.

Figure 2-10 Slide Valve in the
Rotor Casing 2202L5JE-DA-C5-N_2015.05. 2 Compressor Specifications and Structure Compound 2-stage Screw Compressor 2.6 Gas and Oil Flow 1612LSC Speed Increaser Type 2-10 2.6 Gas and Oil Flow The screw compressor’s compression process is described earlier in this manual. Gas for the compound speed increaser type 1612LSC compressor passes from the evaporator and through the suction strainer and check valve, and is sucked into the center part of the compressor ①, and it is compressed at the low-stage ② .Then the compressed gas is discharged at ③. ③ and ④ are connected by piping through which gas used for super cooling is mixed in from the liquid cooler. Lubricating oil injected at the low-stage is, while kept mixed with gas, suctioned from ④ into the high-stage. After being compressed at ⑤, the gas mixed with lubricating oil is discharged from ⑥ to the oil separator, and then sent to the condenser. The oil is cooled even without intermediate gas cooling, so the high-stage discharge temperature can be maintained at below 90 °C. Oil Supply Route Lubricating oil is split into 4 flows as shown in Figure 2-12, and after providing lubrication, it is mixed with discharge gas and leaves the compressor. In standard configurations, oil injection is not performed at the high-stage.

5.2 Maintenance and Inspection List

5.2.1 Daily Management
As daily management, check the items listed in Table 5-1 "Daily Inspection Items" and record the results. Logging these operation data on a daily basis aid in finding out any abnormal conditions of the
compressor. This is significantly effective in preventing compressor failures. It is particularly important to check whether the temperature/pressure correlations related to the refrigerant evaporation and condensation is proper. This makes it possible to quickly find out problems in the compressor or the system. If a failure or accident should occur in the compressor or the system, the operation logbook will help determine the cause and take prompt and proper actions.

Daily Maintenance Items

1. Lubrication oil level
When the oil level in the oil separator reaches the lower limit, charge lubricating oil by referring to the instruction manual of the unit.

2. Replacing oil filter element
When the differential pressure between the inlet and out let ports of the oil filter exceeds 0.1 MPa, replace the oil filter element. At the beginning of the operation, the differential pressure of the oil filter may increase quickly.

3. Cleaning of suction strainer
When the compressor operating hours exceeds 500, check the suction strainer. If a temporary filter is installed for the initial stage of operation, remove it. At the beginning of the operation or after periodical check, the differential pressure between the front and back of the suction strainer may increase quickly. If the differential pressure becomes large, check and clean the suction strainer.

4. Lubricating oil leak rate from mechanical seal
If much oil leaks from the mechanical seal, determine the leak rate per hour. The following table shows guidelines for allowable leak rate and the rate at which inspection must be done. If any problem (damage, etc.) is found in mechanical seal, replace the mechanical seal.

5. Contamination on the cooling water side of the cooling pipes of condenser and oil cooler
Clogging and contamination of the cooling pipe is largely affected by the quality of cooling water. When the oil temperature and discharge pressure gradually rise during the initial stage of operation, inspect and clean the cooling water side of oil cooler and condenser even when the time has not yet come at which inspection must be done.

P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
1-1 Main Rotor Casing (1) CS00100-200L 200L** 1 1 1 - - -
1-1 Main Rotor Casing (1) CS00100-200M 200M** - - - 1 1 -
1-1 Main Rotor Casing (1) CS00100-200S 200S** - - - - - 1
1-2 Main Rotor Casing (2) CS00100-160L 160L** 1 - - - - -
1-2 Main Rotor Casing (2) CS00100-160M 160M** - 1 - 1 - -
1-2 Main Rotor Casing (2) CS00100-160S 160S** - - 1 - 1 1
2-1 Hexagon Socket Head Cap Screw NB35416-050 M16×50 50 50 50 50 50 50
2-2 Hexagon Socket Head Cap Screw NB35412-040 M12×40 52 52 52 52 52 52
3-1 Alignment Pin NE2016-055 Φ16×55 4 4 4 4 4 4
3-2 Alignment Pin NE2013-040 Φ13×40 4 4 4 4 4 4
4-1 Eye Bolt NB600-020 M20 1 1 1 1 1 1
4-2 Eye Bolt NB600-016 M16 1 1 1 1 1 1
5-1 Suction Cover (1) CS00500-2016C1 2016**C 1 1 1 1 1 1
5-2 Suction Cover (2) CS00500-2016C2 2016**C 1 1 1 1 1 1
6-1 Gasket, Suction Cover (1) CS00600-200N 200*** 1 1 1 1 1 1
6-2 Gasket, Suction Cover (2) CS00600-160N 160*** 1 1 1 1 1 1
7 Eye Bolt NB600-012 M12 2 2 2 2 2 2
8-1 Spring Pin (1) NE3206-012 Φ6×12 2 2 2 2 2 2
8-2 Spring Pin (2) NE3204-010 Φ4×10 2 2 2 2 2 2
9 O-ring PA11-030 JIS B 2401 P30 1 1 1 1 1 1
10-1A Plug NF06-010 R3/8 1 1 1 1 1 1
10-1B Plug NF06-015 R1/2 1 1 1 1 1 1
10-2A Plug NF06-008 R1/4 1 1 1 1 1 1
10-2B Plug NF06-008 R1/4 1 1 1 1 1 1
10-2C Plug NF06-010 R3/8 1 1 1 1 1 1
11-1 Bearing Head (1) CS01100-2016C1 2016**C 1 1 1 1 1 1
11-2 Bearing Head (2) CS01100-2016C2 2016**C 1 1 1 1 1 1
12-1 Gasket, Bearing Head (1) CS01200-200N 200*** 1 1 1 1 1 1
12-2 Gasket, Bearing Head (2) CS01200-160N 160*** 1 1 1 1 1 1
13 Eye Bolt NB600-024 M24 2 2 2 2 2 2
14-1 Spring Pin NE320G-012 Φ6×12 2 2 2 2 2 2
14-2 Spring Pin NE3204-010 Φ4×10 2 2 2 2 2 2
15-1A Plug NF06-015 R1/2 1 1 1 1 1 1
15-1B Plug NF06-010 R3/8 1 1 1 1 1 1
16 Bearing Cover CS01600-2016C 2016**C 1 1 1 1 1 1
17-1 Gasket, Bearing Cover (1) CS01700-2016C1N 2016**C 1 1 1 1 1 1
17-2 Gasket, Bearing Cover (2) CS01700-2016C2N 2016**C 1 1 1 1 1 1
18-1 Hexagon Socket Head Cap Screw NB35416-050 M16×50 18 18 18 18 18 18
18-2 Hexagon Socket Head Cap Screw NB35416-055 M16×55 25 25 25 25 25 25 2201LZJE-HO-C6-N_2015.05. Chapter 7 Related Documents

Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-14
P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
19-1 Alignment Pin NE2010-050 Φ10×50 2 2 2 2 2 2
19-2 Alignment Pin NE2016-055 Φ16×55 2 2 2 2 2 2
20 Spring Pin NE3203-010 Φ3×10 1 1 1 1 1 1
21 Plug NF06-004 R1/8 1 1 1 1 1 1
22 Balance Piston Cover CS02202-160VD 160*** 1 1 1 1 1 1
23 Gasket, Balance Piston Cover CS02300-160N 160*** 1 1 1 1 1 1
24 Hexagon Socket Head Cap Screw NB35410-025 M10×25 11 11 11 1 11 11
25-1 Male Rotor (1) CS02520-2016LC1 2016L*C 1 1 1 - - -
26-1 Female Rotor (1)
25-1 Male Rotor (1) CS02520-2016MC1 2016M*C - - - 1 1 -
26-1 Female Rotor (1)
25-1 Male Rotor (1) CS02520-2016SC1 2016S*C - - - - - 1
26-1 Female Rotor (1)
25-2 Male Rotor (2) CS02520-2016LC2 2016*LC 1 - - - - -
26-2 Female Rotor (2)
25-2 Male Rotor (2) CS02520-2016MC2 2016*MC - 1 - 1 - -
26-2 Female Rotor (2)
25-2 Male Rotor (2) CS02520-2016SC2 2016*SC - 1 -- 1 1-
26-2 Female Rotor (2)
27-1 Main bearing (1) CS0270-ERT 200*** 2 2 2 2 2 2
27-2 Main bearing (2) CS0270-DRT 160*** 2 2 2 2 2 2
28-1 Side bearing (1) CS0280-ERT 200*** 2 2 2 2 2 2
28-2 Side bearing (2) CS0280-DRT 160*** 2 2 2 2 2 2
29-1 Stop Ring (1) NG11-130 H130 4 4 4 4 4 4
29-2 Stop Ring (2) NG11-102 H102 4 4 4 4 4 4
30 Balance Piston CS03000-160 160*** 1 1 1 1 1 1
31 Key, Balance Piston CS03100-160 160*** 1 1 1 1 1 1
32 Stop Ring NG12-050 S50 1 1 1 1 1 1
33 Sleeve, Balance Piston CS03300-160 160*** 1 1 1 1 1 1
34 Set Screw NA83606-015 M6×15 2 2 2 2 2 2
35 O-ring PA12-095 JIS B 2401 G95 1 1 1 1 1 1
36 Spacer, O-ring CS03600-160 160*** 1 1 1 1 1 1
37 Stop Ring NG11-102 H102 2 2 2 2 2 2
38-1 Thrust Bearing (1) CS03800-200P 7313B 2 2 2 2 2 2
38-2 Thrust Bearing (2) CS03800-160P 7212B 2 2 2 2 2 2
39-1 Lock Nut (1) NG31-013 AN13 2 2 2 2 2 2
39-2 Lock Nut (2) NG31-012 AN12 2 2 2 2 2 2
40-1 Lock Washer (1) NG32-013 AW13 2 2 2 2 2 2
40-2 Lock Washer (2) NG32-012 AW12 2 2 2 2 2 2
41-1 Spacer, Thrust Bearing (1) CS04100-200 200*** 2 2 2 2 2 2
41-2 Spacer, Thrust Bearing (2) CS04100-160 160*** 2 2 2 2 2 2
42-1 Spacer, Thrust Alignment (1) CS04200B200 200*** 2 2 2 2 2 2
42-2 Spacer, Thrust Alignment (2) CS04200-160 160*** 2 2 2 2 2 2 2201LZJE-HO-C6-N_2015.05.

Chapter 7 Related Documents
Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-15 P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
43-1 Thrust Bearing Gland (1) CS04300-200S 200*** 2 2 2 2 2 2
43-2 Thrust Bearing Gland (2) CS043002016C2B 2016**C 2 2 2 2 2 2
45-1 Hexagon Head Bolt NB111012-035 M12×35 8 8 8 8 8 8
45-2 Hexagon Head Bolt NB111010-030 M10×30 8 8 8 8 8 8
46-1 Lock Washer (1) ND150-012 200*** 8 8 8 8 8 8
46-2 Lock Washer (2) ND150-010 160*** 8 8 8 8 8 8
48 Retainer, Oil Seal CS04800-200VDS 200*** 1 1 1 1 1 1
49 O-ring PA12-115 JIS B 2401 G115 1 1 1 1 1 1
50 Oil Seal CS05010-200VD SA1J 65×85×12 1 1 1 1 1 1
51 Seal Cover CS05100-200 200*** 1 1 1 1 1 1
52 Gasket, Seal Cover CS05200-200N 200*** 1 1 1 1 1 1
53 Hexagon Socket Head Cap Screw NB35410-025 M10×25 8 8 8 8 8 8
54-1 Unloader Slide Valve (1-1) (L port) CS05400-2016**** 2016LSC 1 1 1 - - -
54-1 Unloader Slide Valve (1-1) (M port) 2016LSC 1 1 1 - - -
54-1 Unloader Slide Valve (1-1) (L port) 2016MSC - - - 1 1 -
54-1 Unloader Slide Valve (1-1) (M port) 2016MSC - - - 1 1 -
54-1 Unloader Slide Valve (1-1) (L port) 2016SSC - - - - - 1
54-1 Unloader Slide Valve (1-1) (M port) 2016SSC - - - - - 1
54-2 Unloader Slide Valve (1-2) (L port) 2016*SC - - 1 - 1 1
54-2 Unloader Slide Valve (1-2) (M port) 2016*SC - - 1 - 1 1
54-2 Unloader Slide Valve (1-2) (H port) 2016MSC - - - - 1 -
54-2 Unloader Slide Valve (1-2) (L port) 2016LLC 1 - - - - -
54-2 Unloader Slide Valve (1-2) (M port) 2016*LC 1 - - - - -
54-2 Unloader Slide Valve (1-2) (L port) 2016LMC - 1 - 1 - -
54-2 Unloader Slide Valve (1-2) (M port) 2016*MC - 1 - 1 - -
55-1 Unloader Slide Valve (2-1) 200L** 1 1 1 - - -
55-1 Unloader Slide Valve (2-1) 200M** - - - 1 1 -
55-1 Unloader Slide Valve (2-1) 200S** - - - - - 1
55-2 Unloader Slide Valve (2-2) 160L** 1 - - - - -
55-2 Unloader Slide Valve (2-2) 160M** - 1 - 1 - -
55-2 Unloader Slide Valve (2-2) 160S** - - 1 - 1 1
58-1 Hexagon Socket Head Cap Screw NB35410-030 M10×30 4 4 4 4 4 4
58-2 Hexagon Socket Head Cap Screw NB35408-025 M8×25 4 4 4 4 4 4
59 O-ring PA11-020 JIS B 2401 P20 1 1 1 1 1 1
60-1 Unloader Cylinder CS06000-2016C 2016LSC 1 1 1 1 1 1 2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-16 P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
60-2 Unloader Cylinder CS06000-160L 160L** 1 - - - - -
60-2 Unloader Cylinder CS06000-160M 160M** - 1 - 1 - -
60-2 Unloader Cylinder CS06000-160S 160S** - - 1 - 1 1
61 Hexagon Socket HeadCap Screw NB35410-025 M10×25 2 2 2 2 2 2
62-1 Hexagon Socket Head Cap Screw NB35410-110 M10×110 8 8 8 8 8 8
62-2 Hexagon Socket Head Cap Screw NB35410-065 M10×65 6 6 6 6 6 6
63 O-ring PA12-125 JIS B 2401 G125 2 2 2 2 2 2
64-1 Unloader Piston (1) CS06400-2016T 2016LSC 1 1 1 1 1 1
64-2 Unloader Piston (2) CS06400-160T 160*** 1 1 1 1 1 1
65 O-ring PA11-100 JIS B 2401 P100 2 2 2 2 2 2
66 Cap Seal CS06600-160 BE100 2 2 2 2 2 2
67-1 Push Rod, Unloader Slide Valve (1) CS06700-2016C1 2016LSC 1 1 1 1 1 -
67-1 Push Rod, Unloader Slide Valve (1) CS06700-2016SSC 2016SSC - - - - - 1
67-2 Push Rod, Unloader Slide Valve (2) CS06700-2016C2 2016LSC - - 1 - 1 1
67-2 Push Rod, Unloader Slide Valve (2) CS06700-2016LLC 2016LLC 1 - - - - -
67-2 Push Rod, Unloader Slide Valve (2) CS06700-2016LMC 2016LMC - 1 - 1 - -
68-1 Guide Pin NE2505-012 Φ5×12 1 1 1 1 1 1
68-2 Guide Pin NE2503-008 Φ3×8 1 1 1 1 1 1
69-1 Lock Nut (1) NG31-007 AN07 1 1 1 1 1 1
69-2 Lock Nut (2) NG31-005 AN05 1 1 1 1 1 1
70-1 Lock Washer (1) NG32-007 AW07 1 1 1 1 1 1
70-2 Lock Washer (2) NG32-005 AW05 1 1 1 1 1 1
71-1 Lock Nut (1) NG31-007 AN07 1 1 1 1 1 1
71-2 Lock Nut (2) NG31-005 AN05 1 1 1 1 1 1
72-1 Lock Washer (1) NG32-007 AW07 1 1 1 1 1 1
72-2 Lock Washer (2) NG32-005 AW05 1 1 1 1 1 1
73-1 O-ring PA12-030 JIS B 2401 G30 1 1 1 1 1 1
73-2 O-ring PA11-021 JIS B 2401 P21 1 1 1 1 1 1
74-1 Unloader Cover (1) CS07400-2016S 2016LSC 1 1 1 - - 1
74-1 Unloader Cover (1) CS07400-2016MSC 2016MSC - - - 1 1 -
74-2 Unloader Cover (2) CS07400-160S 160*** 1 1 1 1 1 1
75 O-ring PA12-110 JIS B 2401 G110 2 2 2 2 2 2
76-1 Hexagon Socket Head Cap Screw NB35408-030 M8×30 8 8 8 8 8 8
76-2 Hexagon Socket Head Cap Screw NB35408-025 M8×25 8 8 8 8 8 8
77-1 Indicator Cam (1) CS07700-2016C 2016LSC 1 1 1 - - -
77-1 Indicator Cam (1) CS07700-2016MSC 2016MSC - - - 1 1 -
77-1 Indicator Cam (1) CS07700-2016SSC 2016SSC - - - - - 1
77-2 Indicator Cam (2) CS07700-160L 160L** 1 - - - - -
77-2 Indicator Cam (2) CS07700-160M 160M** - 1 - 1 - -
77-2 Indicator Cam (2) CS07700-160S 160S** - - 1 - 1 1
78 Ball Bearing CS07800-200 #6000 2 2 2 2 2 2
2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-17 P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
79 Stop Ring NG12-010 S10 2 2 2 2 2 2
80 Bearing Gland CS08000-200 200*** 2 2 2 2 2 2
81 Hexagon Socket Head Cap Screw NB35406-015 M6×15 6 6 6 6 6 6
82 V-ring CS08200-200B 20×10×12 2 2 2 2 2 2
83 Spring CS08300-200 200*** 2 2 2 2 2 2
84 Retainer, Indicator Cam Spring CS08400-200 200*** 2 2 2 2 2 2
85 Oil Injection Pipe CS08500-200LUK 200LU* 1 1 1 - - -
85 Oil Injection Pipe CS08500-2016MSC 2016MSC - - - 1 1 -
85 Oil Injection Pipe CS08500-2016SSK 2016SSC - - - - - 1
86 O-ring PA11-021 JIS B 2401 P21 1 1 1 1 1 1
87-1 Guide Block (1) CS08700-200 200*** 1 1 1 1 1 1
87-2 Guide Block (2) CS08700-160 160*** 1 1 1 1 1 1
88-1 Stem, Guide Block (1) 200&250*** 1 1 1 1 1 1
88-2 Stem, Guide Block (2) 160*** 1 1 1 1 1 1
89-1 O-ring PA11-020 JIS B 2401 P20 2 2 2 2 2 2
89-2 O-ring PA11-016 JIS B 2401 P16 2 2 2 2 2 2
91 Shaft key (1) CS09100-200 200*** 1 1 1 1 1 1
92-1 Suction Flange (1) CS71300-150 JIS 20K 150A(6") 1 1 1 1 1 1
92-2 Suction Flange (2) CS71300-100 JIS 20K 100A(4") 1 1 1 1 1 1
93-1 Gasket, Suction Flange (1) CS71200-150N JIS 20K 150A(6") 1 1 1 1 1 1
93-2 Gasket, Suction Flange (2) CS71200-100N JIS 20K 100A(4") 1 1 1 1 1 1
94-1 Hexagon Head Bolt NB12022-055 M22×55 12 12 12 12 12 12
94-2 Hexagon Head Bolt NB12020-055 M20×55 8 8 8 8 8 8
95-1 Discharge Flange (1) CS71300-100 JIS 20K 100A(4") 1 1 1 1 1 1
95-2 Discharge Flange (2) CS71300-080 JIS 20K 80A(3") 1 1 1 1 1 1
96-1 Gasket, Discharge Flange (1) CS71200-100N JIS 20K 100A(4") 1 1 1 1 1 1
96-2 Gasket, Discharge Flange (2) CS71200-080N JIS 20K 80A(3") 1 1 1 1 1 1
97-1 Hexagon Head Bolt NB12020-055 M20×55 8 8 8 8 8 8
97-2 Hexagon Head Bolt NB12020-055 M20×55 8 8 8 8 8 8
100 Mechanical Seal Assembly (BBSE) CS10002-200EBS BBS-E 1 1 1 1 1 1
120-1 Unloader Indicator Assembly (1) CS12000-1612F 1612LSC 1 1 1 1 1 1
120-2 Unloader Indicator Assembly (2) CS12000-200F 200*** 20-100 % 1 1 1 1 1 1
151 Driven Sleeve CS15100-2016 1 1 1 1 1 1
152 Drive Hub 1 1 1 1 1 1
153 Driven Hub 1 1 1 1 1 1
154 Stopper, Driven Sleeve CS15400-2016C 2 2 2 2 2 2
155 Stop Ring FRS-90 4 4 4 4 4 4
157 Key, Driven Hub CS15700-2016C 1 1 1 1 1 1
158 Key, Drive Hub CS15800-2016C 1 1 1 1 1 1
159 Set Screw NA83608-015 M8×15 knurled with anti-loosening 1 1 1 1 1 1
160 Lock Nut NG31-010 AN10 1 1 1 1 1 1
161 Lock Washer NG32-010 AW10 1 1 1 1 1 1
2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-18 P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
162 Hexagon Socket Head Cap Screw NB35406-045 M8×45 5 5 5 5 5 5
163 O-ring PA12-025 JIS B 2401 G25 1 1 1 1 1 1
164 Retainer, Oil Injection Pipe CS16400-2016C 1 1 1 1 1 1
165 O-ring PA12-025 JIS B 2401 G25 1 1 1 1 1 1
166 Hexagon Socket Head Cap Screw NB35408-030 M8×30 4 4 4 4 4 4
168 Pipe Guide, Oil Injection CS16800-2016 1 1 1 1 1 1
197 O-ring PA11-040 JIS B 2401 P40 1 1 1 1 1 1
215-1 Flange, Lubrication Oil Supply (1) CS71300-025 JIS 20K 25A(1") 1 1 1 1 1 1
215-2 Flange, Lubrication Oil Supply (2) CS71300-020 JIS 20K 20A(3/4") 1 1 1 1 1 1
216-1 Gasket, Lubrication Oil Supply Flange (1) CS71200-025N JIS 20K 25A 1 1 1 1 1 1
216-2 Gasket, Lubrication Oil Supply Flange (2) CS71200-020N JIS 20K 20A 1 1 1 1 1 1
217-1 Hexagon Head Bolt NB111016-045 M16×45 4 4 4 4 4 4
217-2 Hexagon Head Bolt NB111012-035 M12×35 4 4 4 4 4 4
218 Flange, Injection Oil Supply CS71300-015 JIS 20K 15A(1/2") 1 1 1 1 1 1
219 Gasket, Injection Oil Supply Flange CS71200-015N JIS 20K 15A 1 1 1 1 1 1
220 Hexagon Head Bolt NB111012-035 M12×35 4 4 4 4 4 4
237-1 Torsional Slip Washer (1) CS23700-200 200*** 2 2 2 2 2 2
237-2 Torsional Slip Washer (2) CS23700-160 160*** 2 2 2 2 2 2
245 Special Spring Washer for Hexagon Socket Head Cap Screw ND330-08 M8 5 5 5 5 5 5
250-1 Thrust Washer (1) CS25000-200 200*** 2 2 2 2 2 2
250-2 Thrust Washer (2) CS25000-160 160*** 2 2 2 2 2 2
267-1 Special Spring Washer for Hexagon Socket Head Cap Screw ND330-10 M10 4 4 4 4 4 4
267-2 Special Spring Washer for Hexagon Socket Head Cap Screw ND330-08 M8 4 4 4 4 4 4
420 Unload Spacer CS42000-160L20 For 2016*LC(2) 20 % load 1 - - - - -
420 Unload Spacer CS42000-160M20 For 2016*MC(2) 20 % load - 1 - 1 - -
420 Unload Spacer CS42000-160S20 For 2016*SC(2) 20 % load - - 1 - 1 1
421 O-ring PA12-030 JIS B 2401 G30 - - 1 - 1 1
421 O-ring PA11-030 JIS B 2401 P30 2 2 - 1 - -
423 Unload spacer Used for MSC low-stage only. - - - 1 1 -
424 Hexagon Socket Head Cap Screw NB35406-020 M6×20 Note 1 - - - 3 3 -
432-1 O-ring PA62-022 AS568A-244 (JIS W1516 G22) 4 4 4 4 4 4
432-2 O-ring PA12085 JISB2401 1A G85 4 4 4 4 4 4
433-1 O-ring PA62022 AS568A-244 (JIS W1516 G22) 4 4 4 4 4 4 2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.2 Parts Configuration Table 7-19 P/N Part name Code No. Remarks Q’ty. LLC LMC LSC MMC MSC SSC
433-2 O-ring PA12-085 JIS B 2401 G85 4 4 4 4 4 4
528 Sleeve, Oil Seal CS52809-200VD 200V** with O-ring 1 1 1 1 1 1
529 Set Screw NA83606-008 M6×8 2 2 2 2 2 2
605-1 Plug NF06-008 R3/4 1 1 1 1 1 1
605-2 Plug NF06-015 R1/2 1 1 1 1 1 1
607 Plug NF06-004 R1/8 1 1 1 1 1 1
702 O-ring PA12-100 JIS B 2401 G100 Note 1 - - - 1 1 -
744 O-ring PA12-060 JISB2401 1A G60 1 1 1 1 1 1 - O-ring Set CS7109-0K 2016C NBR - O-ring Set CS7109-5K 2016C FPM - Gasket Set CS7118-0K 2016C - Lock Nut and Washer Set CS8009-K 2016C
The part code of the O-ring except for "O-ring set 2016C FKM" is the one assigned to NBR which is standard material. When the material of the O-ring is other than NBR, a different part code is used for each material. If you are using O-rings made from other than the standard material, please contact SCS when placing an order.
Note 1: The hexagon socket head cap screw (No. 424) is used to fasten the unload spacer (No. 423), which is for the exclusive use of the MSC low-stage, to the unloader cover (No. 74-1). In April 2007, this spacer and the explosion proof type unloader piston spacer were standardized according to the design change. As a result, the use of this part is discontinued. One piece of O-ring (No.702) (JIS B 2401 G100) is used instead of this part. According to this design change, the use of the MSC unloader cover (1) with bolt hole for spacer is also discontinued. The MSC unloader cover and the LSC unloader cover are shared/standardized. 2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.3 Tightening Torques for Bolts and Nuts 7-20
7.3 Tightening Torques for Bolts and Nuts Table 7-2 List of Tightening Torques Hexagon socket head cap screw P/N What is tightened Tightening torque Q’ty. Size N·m kgf·cm
2-1 Main Rotor Casing (1) to Suction Cover (1) and Bearing Head (1) 240 2400 50 M16×50
2-2 Main Rotor Casing (2) to Suction Cover (2) and Bearing Head (2) 90 900 52 M12×40
18-1 Bearing Cover to Bearing Head (1) 240 2400 18 M16×50
18-2 Bearing Head (2) to Suction Cover (1) 240 2400 25 M16×55
24 Balance Piston Cover to Suction Cover (2) 50 500 11 M10×25
53 Seal Cover to Bearing Cover 50 500 8 M10×25
58-1 For Securing Unloader Slide Valve 50 500 4 M10×30
58-2 For Securing Unloader Slide Valve 25 250 4 M8×25
61 Unloader Cylinder (2) to Balance Piston Cover 50 500 2 M10×25
62-1 Unloader Cylinder (1) to Bearing Cover and Bearing Head (1) 50 500 8 M10×110
62-2 Unloader Cylinder (2) to Balance Piston Cover and Suction Cover 50 500 6 M10×65
76-1 Unloader Cylinder Cover (1) to Unloader Cylinder (1) 25 250 8 M8×30
76-2 Unloader Cylinder Cover (2) to Unloader Cylinder (2) 25 250 8 M8×25
81 Bearing Gland 10 100 6 M6×15
162 Push Rod, Unloader Slide Valve (1) 25 250 5 M8×45
166 Retainer, Oil Injection Pipe 25 250 4 M8×30

Hexagon Head Bolt P/N What is tightened Tightening torque Q’ty. Size N·m kgf·cm
45-1 Thrust Bearing Gland (1) 50 500 8 M12×35
45-2 Thrust Bearing Gland (2) 40 400 8 M10×30
94-1 Suction Flange (1) JIS20K 150A 240 2400 12 M22×55
94-2 Suction Flange (intermediate pipe) (2) JIS20K 100A 180 1800 8 M20×55
97-1 Discharge Flange (intermediate pipe) (1) JIS20K 100A 180 1800 8 M20×55
97-2 Discharge Flange (2) JIS20K 80A 120 1200 8 M16×55 2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.3 Tightening Torques for Bolts and Nuts 7-21
Lock Nut P/N What is tightened Tightening torque (N·m) Q’ty. Size Standard Maximum
39-1 Thrust Bearing (1) Note 1 522 653 2 AN13
39-2 Thrust Bearing (2) Note 1 408 510 2 AN12
69-1 Unloader Piston (1) 120 - 1 AN07
69-2 Unloader Piston (2) 80 - 1 AN05
71-1 Unloader Slide Valve (1-1) 79 99 1 AN07
71-2 Unloader Slide Valve (1-2) 28 35 1 AN05
160 Gear Coupling Drive Hub Note 1 238 297 1 AN10
Note 1: When tightening a lock nut, if it is difficult to use a torque wrench, manage the tightening torque of the lock nut controlling the tightening angle range as explained below.
Tightening Angle Range of Lock Nuts for Rotors
a) After tightening the lock nut by hand, further tighten the lock nut by using a lock nut wrench until the rotor starts to turn. Take care not to over-tighten.
b) Put a mark on the lock nut at the right side edge of the rotor groove where the stopper tongue of the lock washer fits in, as shown in Figure 7-9.
c) From this marking position, tighten the lock nut in such a way that rotation can be stopped within the tightening angle range shown in Table 7-3 (2016**C【39-1】,【39-2】and【160】:
30° to 40°(first time tightening), 20° to 30°(second time tightening). When measuring the angle, use an angle gauge which is set to the diameter of rotor shaft.

Lock Nuts of Rotor
* When tightening lock nut, tightening start position differs between the first time tightening and the tightening for the second time or after. Therefore, angle ranges are specified also for the second time tightening. Figure 7-9 Position where mark is put Photo 122 Angle Gauge (example) Model Angle range 2016**C Low-stage High-stage First time tightening 30° to 40° Rotor groove (slot) Marking Second time tightening 20° to 30° where stopper tongue of the lock washer fits 2201LZJE-HO-C6-N_2015.05.

Compound 2-stage Screw Compressor 2016**C 7.4 About the O-rings Used
7-22
7.4 About the O-rings Used
7.4.1 List of O-rings Used
Table 7-4 List of O-rings Used P/N
Location nominal attached place description in functional aspect symbols
9 Suction Cover (2) Push Rod P30
35 Sleeve, Balance Piston same as left G95
49 Oil Seal Retainer same as left G115
59 Pipe Guide, Oil Injection Oil Injection Pipe P20
63 Bearing Cover, Balance Piston Cover Unloader Cylinder (1), (2) G125
65 Unloader Piston (1), (2) same as left P100
73-1 Unloader Push Rod (1) Unloader Piston (1) G30
73-2 Unloader Push Rod (2) Unloader Piston (2) P21
75 Unloader Cylinder Cover (1), (2) same as left G110
86 Oil Injection Pipe same as left P21
89-1 Stem, Guide block (1) same as left P20
89-2 Stem, Guide block (2) same as left P16
163 Unloader Slide Valve (1) same as left G25
165 Gland, Oil Injection Pipe same as left G25
197 Bearing Cover Push Rod, Unloader Slide Valve (1) P40
421 Unload Spacer 2016*SC (2) same as left G30
421 Unload Spacer 2016*LC (2), *MC (2) same as left P30
432-1 Main Bearing (1) same as left AS568A-244
432-2 Main Bearing (2) same as left G85
433-1 Side Bearing (1) same as left AS568A-244
433-2 Side Bearing (2) same as left G85
702 Unloader Spacer (used for MSC low-stage only) same as left G100
744 Sleeve, Oil Seal same as left G60
■ Designation codes are based on JIS B 2401 except AS568A-244.
■ Attached place means parts which they have grooves or with taper cutting for attaching O-ring.
7.4.2 O-ring Materials Used for Screw Compressor
Table 7-5 List of O-ring Materials Used for Screw Compressor (excluding mechanical seal)
Working fluid O-ring material Ammonia Hydrofluorocarbon (HFC) NBR CO2 FKM HNBR Trifluoromethane (R23) FKM Propane Propylene Natural gas City gas Helium