High Pressure Switches; Commissioning; Checking The Strength Pressure; Checking Tightness - Biber OSKA9563 Instructions De Service

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
leaving the factory.
DANGER
Risk of explosion!
Never pressurize the compressor with oxygen
(O ) or other industrial gases!
2
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
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 had been already tested in the
factory for strength pressure. A tightness test is there-
fore sufficient, see chapter Checking tightness, page
10.
If you still wish to perform a strength pressure test for
the entire assembly:
10
) before
2
or air).
2
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 10.

6.3 Charging with oil

Oil type: see chapter Application ranges, page 5. 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 8, 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 control module controls the
solenoid valve in the oil injection line, see Tech-
nical Information ST-150.

6.4 Evacuation

Switch on oil heater in the oil separator.
Open the shut-off valves. Keep the shut-off valve in the
oil injection line closed. Use a vacuum pump to evacu-
ate the entire system, including the compressor, on the
low and the high pressure sides. With the vacuum
pump shut off, a "standing vacuum" lower than
1.5 mbar must be achieved. Repeat the operation sev-
eral times if necessary. After the evacuation, open the
shut-off valve in the oil injection line.
SB-520-1