COSTAN TECHNICAL DOCUMENTATION
REVISION STATUS
TRUE COPY
PAGE 14 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
-
shut off all those components that may be damaged (low pressure-switches, low-pressure
transducers, low-pressure meters);
-
open all taps and automatic valves and keep them open;
The minimum overpressure time for the system undergoing the pressure-resistance test is
6 hours
(system leakage check).
The pressure-tightness test may be performed, if this is considered useful, also for system sections
shut off by taps (partial tests). The pressure test is finished when both sides of the system have
been put to overpressure and no works are needed on permanent joints.
The outcome of the test must be recorded by the person in charge of the jobs.
Preparation of filters and vacuum test
When the machine is delivered, filter cores are not in place. These are supplied in air-tight
containers, in numbers appropriate for initial startup and first replacement. At first place the
supplied dryer cores Castel 4490/A on both filters (liquid and suction).
Dryer cartridges 4490/A must be placed in the filter using the appropriate holding set (mesh
inner tube, cap and spring); cartridges 4495/C (on the suction line) only use a top cap, a
bottom cap and a spring as in the instructions on the core’s packaging.
Close the circuit, connect up the vacuum pump and scavenge the system and/or affected stretches.
If the system contains a halide or hydrocarbon charge above 20 kg, the system must be dried and
scavenged to a vacuum below 270 Pa absolute (same value for both sides, high and low pressure).
Vacuum must be kept for at least 30 minutes and then dry nitrogen must be introduced. Then
scavenge again to vacuum below 270 Pa absolute. Keep the system in this condition for at least
6h. Then ensure that the pressure was actually kept and introduce the system refrigerating fluid.
The vacuum test may be performed, if this is considered necessary or useful, also for system
sections shut off by taps (partial tests).
The charge will only be filled up when the appliances fed have reached their operating
temperature.
Checking pressure switches, filling and starting up the system
The system’s safety pressure switches KP7S and KP7B have a sticker on the outside, that
indicates tripping pressure and serial number. Pressure switch KP7S is marked red and factory-set
for a pressure of 28bar whereas pressure switch KP7B is marked blue and factory-calibrated for a
pressure of 27bar. After being calibrated, the adjustment screw is sealed with lead to prevent
tampering. Both pressure switches are manual-reengagement (manual
reset
) type. to reengage
pressure switch KP7B, just remove the upper lid and push the green tab inwards; to
reset
pressure
switch KP7S it is necessary to open the pressure switch (the reset button is up in the right corner).
!
Check that the lead seals are intact; do not tamper with the adjustment screw of
safety pressure switches.
!
Prior to resetting safety switches manually (KP7S or KP7B), identify and remove the
causes that have led to system failure.
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