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COSTAN TECHNICAL DOCUMENTATION
REVISION STATUS
TRUE COPY
PAGE 15 OF 18
PRODUCT:
EPTAGLOO
ORD
DATE
CHANGE ORDER
OF THE SIGNED
DATE OF 1st ISSUE
A
18.Dec.2008
UPDATE
ORIGINAL
13/June/07
DOC. no. QSM0000406A
CHAP. No.:
040
B
28.July.2009
UPDATE
C
CHAPTER:
INSTALLATION
C
23.Feb.2010
RANGE
EXTENSION
D
11.Nov..2010
SAFETY VALVE ADDED
ISSUED BY MKT
The high pressure switches protecting the compressors are set to a trip value of 26.5bar. Set the
system/compressor safety low pressure switch.
Set the high pressure switches for fan unloaders and the electromechanical security (duty cycle)
low pressure switch.
Perform an initial charge of refrigerant in liquid condition on the line downstream from the
receiver (liquid line) using tanks with liquid-gas tap or overturning the container if this is
equipped with a standard valve. These steps are necessary to prevent any change in the relative
concentration of refrigerant components.
Before starting up the machine it is necessary to power the outer crankcase heaters (oil heater) for
at least 6-8 hours. Ensure that the discharge and suction taps are open. Then start one compressor
at a time (for multi compressor packs), supervising the relevant equipment (pressure-meter) and
operating pressure on both the discharge side (compression) and on the return side (suction).
The figure below shows the running diagram for the safety pressure switches featured in each
single compressor.
The action of pressure switches, with reference to the refrigerating diagrams in Chapter 2, can be
summarized as follows:
•
HP safety pressure switches: (HP PED pressure switch): when pressure rises above the calibration value
downstream of the compressors, then these pressure switches trip, shutting down the power supply and
consequently stopping all the compressors.
•
BP safety high-pressure switch (LP PED pressure switch): when pressure drops below the
calibration value following an excessive decrease in suction temperature, then this pressure
switch trips, which shuts down the power supply and consequently stops all the
compressors;
HP PED pressure switch:
LP PED pressure switch
Compressor pressure switch
Cut out press. switch > stop supply > stop compressors
Cut out press. switch > stop supply > stop compressors
Cut out press. switch > stop supply > stop single compressor
HP= high pressure
LP= low pressure
Pressostato compressore
Azione del pressostato > arresto alimentazione > arresto del compressore
Pressostato BP PED
Azione del pressostato > arresto alimentazione > arresto del compressore
Pressostato AP PED
Azione del pressostato > arresto alimentazione > arresto del compressore
AP= alta pressione
BP= bassa pressione
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