REFRIGERATION DIVISION
V SERIES
SCREW COMPRESSOR HANDLING MANUAL
Supersedes all previous version. This information is for reference use only and subject to change without notice
Revision 2 (June 05,2000) Page 11 of 61
H port ĺ M port H port ĺ L port
H ĺ M 160VS* 160VM* 160VL* H ĺ L 160VS* 160VM* 160VL*
Distance
No. of Turns
18mm
7.2
23mm
9.9
27mm
10.8
Distance
No. of Turns
37mm
14.0
45mm
18.0
55mm
22.0
H ĺ M 200VS* 200VM* 200VL* H ĺ L 200VS* 200VM* 200VL*
Distance
No. of Turns
23mm
6.6
28mm
8.0
34mm
9.7
Distance
No. of Turns
46mm
13.0
57mm
16.0
69mm
19.0
H ĺ M 250VS* 250VM* 250VL* H ĺ L 250VS* 250VM* 250VL*
Distance
No. of Turns
29mm
7.3
36.5mm
9.1
43mm
10.8
Distance
No. of Turns
58mm
14
72.5mm
18
87mm
21
H ĺ M 320VS* 320VM* 320VL* H ĺ L 320VS* 320VM* 320VL*
Distance
No. of Turns
59mm
13
50mm
11
47mm
10
Distance
No. of Turns
98mm
21.5
98mm
21.5
105mm
23
Fig. 13 Vi Changing Rod Adjustment By Model
Reference:
Dimensions of screw used to change Vi.
Accordingly:
Number of turns x pitch = Variable Vi slide valve distance change
160v**
M20 x P2.5
200v**
M30 x P3.5
250v**
M36 x P4
Precautions when changing Vi.
1. The Vi should be changed only when the compressor is stopped and the capacity control
mechanism is set to the no-load position.
2. Unreasonable force should not be applied to the mechanism provided on L port and M port
compressors.
3. If the Vi needs to be positioned midway between two different ports, select the best port
referring to the capacity chart. Do not use variable Vi except for L, M and H ports.
4. The Vi should not be changed frequently in an attempt to adjust to small changes in the
compression ratio, which may arise during normal operations. If no substantial change in
operating conditions (e.g., a change in evaporative temperature) is required, the Vi should be
changed only in the autumn and spring following the respective summer and winter seasons.
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