2205B0JE-DA-J-N_2014.05.
Screw Compressor J-series
Appendix 1.1 Precautions for Design of the Compressor Package
Appendix1-4
Oil
Pump
When using booster to make minimum differential oil pressure (the differential pressure between oil
supply pressure and suction pressure) should be more than 0.5MPa, an oil pump which can refill all
oil volume should be provided.
Under high pressure conditions; discharge pressure is more than 2.2Mpa or suction pressure is
more than 0.8MPa, to make thrust bearing service life longer, an oil pump which can refill all oil
volume should be provided.
The oil pump is also required for lubrication before start-up and to move capacity control slide valve
and the variable Vi slide valve when the compressor is stopped.
The oil pump must be installed after the oil filter.
Oil
Filter
To eliminate contaminants in the lubricant, an oil filter (main filter) must be installed in the oil line.
According to the requirements of the use of the package unit or the standard to apply, install an oil
filter of appropriate filtration precision in the lubrication system of the compressor.
In the case of general applications such as closed-cycle refrigeration systems, we recommend to
use an oil filter with beta ratio in the range of
β
20
≥
150 that conforms to requirements of NAS 1638
class 8 or ISO 4406 17/15/13.
When the package unit requires API 619 4th/5th edition conformity, use an oil filter with beta ratio in
the range of
β
10
≥
200.
Any contaminants in the lubricant may cause damage to important components
such as bearings and shaft seal.
Economizer
Piping
To install economizer piping, follow the instructions below.
1) When an economizer is used, the E plug (728) must be removed. Refer to Sectional View 3/3.
2) For 170J-series, remove the blind flange for the economizer (ANSI #300 1") to access the E
plug. The E plug head is exposed and a tool (socket, size 18) can be fitted to the head of the E
plug. Use a wrench to remove the E plug.
For 220J/280J-series, first remove the E plug flange (728-3). Then remove the E plug gland
(728-2) and the E plug in this order by using the eye bolt (M8).
3) For 170J-series, insert a R3/4 hexagon socket headless tapered pipe plug after removing the
E plug.
The plug must be a metric taper screw plug. (Do not use a NPT plug.) After attaching the R3/4
plug, apply anticorrosive paint to the plug head and the counter bore. Applying grease
additionally is more effective for rust proofing.
For 220J/280J-series, reattach the E plug flange and the E plug gland after removing the E
plug.
4) To connect the pipe for the economizer port, use ANSI #300 flanges. The flange size is 1B for
170J, 1 1/2B for 220J, and 2 1/2B for 280J.
5) While installing the pipes, take sufficient care not to allow any contamination such as spatters
to remain in the piping and enter the compressor.
