Coolant Passes; Commissioning; Checking Tightness; Charging Refrigerant - Bitzer K033N Série Mode D'emploi

4.10 Coolant passes

Depending on the end covers, the coolant passes the
pressure vessel 2, 3, 4, or 6 times.
K573H(B) .. K4803T(B): 4-pass end covers are moun-
ted as standard. Alternative: 2-pass end cover
At all other devices it can be chosen between 4 or 2
and 6 or 3 passes at the same end cover. This de-
pends the positions to which the coolant pipes are
mounted.
Fig. 6: K033N/H(P)(B) .. K373H(P)(B): 4 or 2 passes at the same
cover is possible depending on the connection, OW781(B) ..
OW941(B): 6 or 3 passes at the same cover is possible depending on
the connection
Fig. 7: K573H(P)(B) .. K4803T(P)(B): different end covers for 4 or 2
passes
Fig. 8: OW781(B) .. OW941(B): 6 or 3 passes at the same cover is
possible depending on connection

5 Commissioning

The pressure equipment was tested in the factory as a
single unit. After installation, the tightness of the con-
nections and of the piping system must be tested
again.

5.1 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.
12
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!

5.2 Charging refrigerant

Use only allowed refrigerants, see chapter Application
ranges, page 5.
DANGER
Risk of bursting of components and pipelines
due to hydraulic excess pressure while feeding
liquid.
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 during liquid feeding!
Measure out extremely precise quantities!
Keep the oil temperature above 40°C.
◦ Before charging with refrigerant: Put the coolant cir-
cuit into operation. Otherwise the coolant might
freeze.
◦ Check the oil level in the compressor.
• Charge condenser or receiver, on systems with
flooded evaporator, maybe also the evaporator dir-
ectly with liquid refrigerant.
• Blends must be taken out of the charging cylinder as
a solid liquid.
• After commissioning, it may be necessary to add re-
frigerant: While the compressor is running, charge
with refrigerant on the suction side, preferably at the
evaporator inlet.

5.3 Coolant

The maximum permitted coolant volume flow is indic-
ated in the BITZER SOFTWARE. This value refers to
clean and gas-free water with a flow velocity of 2.5 m/s.
The pressure vessel can be operated with water con-
taining a slight amount of solids or gases with a flow
DB-200-5