2202G1JE-DA-M-N_2010.01.
1 Safety
Reciprocating Compressor M Series
1.4 Safety Devices
1-13
Settings
Specify the settings of Low oil pressure failure protection equipment (OP), High pressure protection
equipment (HP), and Low pressure control equipment (LP) referring to the table below, and make sure to
provide the users of this compressor with the information.
Table 1-3 Settings (example)
Compressor
failure
Compressor
enabled
Timer
Recovery
Low oil pressure failure
protection (OP)
Suction pressure
+0.10 MPa
Suction pressure
+0.12 MPa
30 seconds
Manual reset
High pressure protection
(HP)
2.7 MPaG or
lower*
―
None Manual
reset
Low pressure control (LP)
Depends on refrigerant and system in use
Automatic reset
For high pressure protection (HP), set value lower than the safety relief valve. Set the value to
protection equipment to detect an error immediately. Measure pressure electrically and generate
an alarm by a control circuit, to generate a pre-alarm when the pressure is approaching the
abnormal value.
Inspection
Method/Cycle
Each compressor’s protection equipment requires operational test and for function and accuracy. Specify the
inspection methods/cycle of respective compressor protective equipment, and make sure to provide users of
this compressor with them.
If operation test of high pressure protection equipment (HP) is performed at the
setting value, it may cause explosion of devices. Make sure to perform the test at
the normal operation pressure or below.
For operational test, use devices such as pressurize tester to check that alarms
and switches operate normally. Do not operate the compressor with all the valves
closed, or in any other dangerous conditions.
If low oil pressure failure protection (OP) or high pressure protection (HP)
shutdown the system, make sure to eliminate the cause of it before resetting the
compressor.