OPERATING INSTRUCTIONS
CO
2
/NH
3
CASCADE UNIT
250 - 1000 KW
16 _551511_om_kas_gbr_1_.doc
Danger!
Circuit Item No. charging valve
An oil pressure adjusted too high or too
low can lead also after short operation
time to serious compressor damages or
even to a total breakdown of the
compressor!
NH 2865
3
CO 6865
2
The location of these charging valves is given in the
P+I flow diagram.
In comparison to normal operation conditions the oil
differential pressure can be (at identical opening
level of the valve) slightly higher if only the oil pump
is operated (service mode) or in case the operating
temperature is not reached yet.
Caution!
Mixing even the smallest quantities of
NH
and CO
3 2
in the refrigerant cycles
must be avoided under all circumstances!
In this case the oil differential pressure should be
readjusted (according to the value in the P+I
diagram) after start of the unit and reaching of the
operation temperature.
Use top quality (specially cleaned and
dried) NH
and CO only!
3 2
1.6.2.7 Mounting the coupling
Whenever work is carried out on the parts of the
refrigerating system carrying refrigerant or oil,
extreme caution is required as leaking refrigerant
can cause hazards. Note and observe the refrigerant
safety data sheets.
1. The electric switchgear is secured to prevent it
from being switched on accidentally.
2. Mount the coupling, observe instructions of
separate documentation.
For health and safety reasons, safety goggles and
protective gloves must be worn.
3. The values for radial and angular deviations
given in the coupling documentation must be
checked and if necessary corrected.
Refrigerant charging procedure
Equipment required:
4. The real values have to record at data sheet of
coupling documentation. Please send back a
copy of the filled data sheet to:
— Refrigerant filling cylinder with liquid connection
— Weighing scales for refrigerant cylinder
Grasso GmbH RT
— Special filling hose with cylinder connection
Holzhauser Straße 165
— Shut-off valve with connection adapter for the
charging valve
13509 Berlin, GERMANY
Fax: +49 (0)30 - 43 592 759
When charging for the first time, weigh the quantity
of refrigerant given on the cascade's name plate. To
do this, place the refrigerant cylinder with sufficient
refrigerant on weighing scales. Before starting to
charge, determine the weight of the cylinder.
Caution!
Pay attention to maintenance
instructions!
Regreasing the coupling (if provided for
in the maintenance instructions for the
coupling)!
Connect the filling hose to the refrigerant cylinder.
Warning!
The compressor must be ready for
refrigerant charging!
1.6.2.8 Refrigerant charging
After evacuating the refrigerant circuits, the system
can be charged with refrigerant via the refrigerant
charging valve and then the vacuum can be broken.
1. Connect the refrigerant reservoir to the charging
valve.
2. Open the charging valve.
The refrigerant circuits are only charged via the
charging valves of the respective circuit.
3. Carefully open the reservoir valve and equalize
the pressure.
4. Close the valve.
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