Evacuation; Refrigerant Charge - Danfoss BOCK HRX CO2 T H Translation Of The Original Instructions

6 | Commissioning

6.4 Evacuation

ATTENTION
First evacuate the system and then include the compressor in the evacuation process.
Relieve the compressor pressure.
Evacuate the suction and discharge pressure sides using the vacuum pump.
The vacuum has to be broken with nitrogen several times between the evacuation.
At the end of the evacuation process, the vacuum should be < 1.5 mbar when the pump is switched off.
Repeat this process as often as is required.

6.5 Refrigerant charge

CAUTION
INFO
Filling the liquid refrigerant: It is recommended that the system first be filled at standstill
with gas on the high-pressure side up to a system pressure of at least 5.2 bar (if it is filled
below 5.2 bar with liquid, there is a risk of dry ice formation). Further filling according to
system.
To eliminate the possibility of dry ice formation when the system is operating (during and
after the filling process), the shut-off point of the low-pressure switch should be set to a
value of at least 5.2 bar.
WARNING
A refrigerant supplement, which may become necessary after start-up, can be topped up
in vapour form on the suction side.
ATTENTION
© Danfoss | Climate Solutions | 2023.06
Do not start the compressor if it is under vacuum. Do not apply
any voltage - even for test purposes (must only be operated with
refrigerant).
Under vacuum, the spark-over and creepage current distances of the
terminal board connection bolts shorten; this can result in winding and
terminal board damage.
Wear personal protective clothing such as goggles and protective
gloves!
Depending upon design of the CO
(with/without tubing) CO
gaseously.
Use only high-dried CO
Never exceed the max. permissible pressures while charging.
Precautions must be taken in time.
Avoid overfilling the machine with refrigerant!
Do not charge liquid refrigerant into the suction-side on the
compressor.
Do not mix additives with the oil and refrigerant.
refrigerant filling bottle
2
can be filled in liquid after weight or
2
quality (see chapter 3.1)!
2
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