SB-520-2
28
5.2.2
Motor safety and protection devices
Provide motor safety and protection devices according
to the regulations of the motor manufacturer or the dir-
ectives on the protection of drive motors.
5.2.3
High pressure switches
A pressure limiter and a safety pressure limiter are re-
quired for securing the compressor's application range
in order to avoid unacceptable operating conditions.
The low pressure can be secured using the built-in low
pressure transmitter, see Technical Information
ST-150.
6
Commissioning
The compressor has been carefully dried, checked for
tightness and filled with a holding charge (N
2
) before
leaving the factory.
DANGER
Risk of explosion!
Never pressurize the compressor with oxygen
(O
2
) or other industrial gases!
WARNING
Risk of bursting!
A critical shift of the refrigerant ignition limit is
possible in case of excess pressure.
Do not add a refrigerant (e.g. as a leak indic-
ator) to the test gas (N
2
or air).
Environmental pollution in case of leakage and
when deflating!
!
!
NOTICE
Risk of oil oxidation!
Check the entire system for strength pressure
and tightness, preferably using dried nitrogen
(N
2
).
When using dried air: Remove the compressor
from the circuit – make sure to keep the shut-off
valves closed.
6.1
Checking the strength pressure
Check the refrigerant circuit (assembly) according to
EN 378-2 (or other applicable equivalent safety stand-
ards). The compressor has already been tested in the
factory for pressure strength. A tightness test is there-
fore sufficient (see chapter Checking tightness, page
28).
If you still wish to perform a pressure strength test for
the entire assembly:
DANGER
Risk of bursting due to excessive pressure!
The pressure applied during the test must never
exceed the maximum permitted values!
Test pressure: 1.1-fold of the maximum allow-
able pressure (see name plate). Make a distinc-
tion between the high-pressure and low-pres-
sure sides!
6.2
Checking tightness
Check the refrigerant circuit (assembly) for tightness,
as a whole or in parts, according to EN 378-2 (or other
applicable equivalent safety standards). For this, create
an overpressure, preferably using dried nitrogen.
Observe test pressures and safety reference, see
chapter Checking the strength pressure, page 28.
6.3
Charging with oil
Oil type: see chapter Application ranges, page 23. Ob-
serve information in manual SH-510.
Charged quantity:
Quantity required for the operation
of oil separator and oil cooler plus the volume of the oil
lines. The additional quantity for oil circulation in the re-
frigerant circuit is approx. 1 .. 2% of the refrigerant
charge; in systems with flooded evaporators the share
of the additional quantity may be greater.
To prevent dry running of the shaft seal during the com-
pressor start, charge approx. 1 l oil in the connection
for oil injection (see figure 2, page 26, pos. 5).
Before evacuation, charge oil directly in oil separator
and oil cooler. Open shut-off valves of oil separator / oil
cooler. The filling level in the oil separator must be
within the sight glass area.
Information
The compressor module controls the solenoid
valve in the oil injection line, see Technical In-
formation ST-150.
