SB-110-4
49
!
!
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 pressure strength
Check the refrigerant circuit (assembly) according to
EN378-2 (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
49. If you still wish to perform a strength pressure 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 EN378-2 (or other
applicable equivalent safety standards). For this, create
an excess pressure, preferably using dried nitrogen.
Observe test pressures and safety reference, see
chapter Checking pressure strength, page 49.
6.3
Evacuation
▶ Switch on the oil heater.
▶ Open all shut-off valves and solenoid valves.
▶ Use a vacuum pump to evacuate the entire system,
including the compressor, on the suction side and
the high-pressure side.
➙ With the vacuum pump shut off, a "standing vacuum"
lower than 1.5 mbar must be achieved.
▶ Repeat the operation several times if necessary.
!
!
NOTICE
Risk of damage to the motor and compressor!
Do not start the compressor while it is in a va-
cuum!
Do not apply any voltage, not even for testing!
6.4
Charging with oil
Oil type: see chapter Application ranges, page 33. Ob-
serve information in Manual SH-110.
Charged quantity: Operating charge of oil separator
and oil cooler (see Technical data in Manual SH-110)
plus the volume of the oil lines. Additional quantity for
oil circulation in the refrigerant circuit approx. 1..2% of
the refrigerant charge; this proportion may be higher for
systems with flooded evaporators.
Before evacuation, directly charge the oil separator and
the oil cooler with oil. Do not charge the compressor
directly with oil! Open shut-off valves of oil separator /
oil cooler. Close the maintenance valve (see figure 11,
page 47) in the oil injection line! The level in the oil sep-
arator must be within the sight glass range. For sys-
tems with flooded evaporators, add the additional
quantity required directly to the refrigerant.
6.5
Charging refrigerant
Use only permitted refrigerants, see Application ranges.
DANGER
Risk of bursting of components and pipes due to
liquid excess pressure while charging liquid re-
frigerant.
Serious injuries are possible.
Avoid overcharging the system with refrigerant
under all circumstances!
WARNING
Risk of bursting due to counterfeit refrigerants!
Serious injuries are possible!
Purchase refrigerants only from reputable man-
ufacturers and reliable distributors!
!
!
NOTICE
Risk of wet operation by charging liquid refriger-
ant!
Measure out extremely precise quantities!
Maintain the discharge gas temperature at least
20 K above the condensing temperature.
Before charging with refrigerant:
Do not switch the compressor on!
Switch the oil heater on.
Check the oil level in the compressor.
▶ Charge the condenser or receiver directly with liquid
refrigerant; in systems with flooded evaporator, pos-
sibly also the evaporator.
▶ Blends must be taken out of the charging cylinder as
a bubble-free liquid.
