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© Danfoss | Climate Solutions | 2023.06
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Areas of application at HC and LG compressors
5.3 Operating limits
ATTENTION Compressor operation is possible within the operating limits.
These can be found in Bock compressor selection tool
(VAP) under
vap.bock.de.
Observe the information given there and the follo
-
wing notes:
-
The final compression temperature must be at least 20K above
the condensing temperature (dew point). If necessary, an inter
-
nal heat exchanger IHX must be provided for this purpose.
- Min. oil temperature
≥
30°C.
- Operation in the vacuum range is not permitted.
During operation in the vacuum range, there is a danger of air
entering on the suction side. This can cause chemical reactions,
pressure rise in the condenser and an excessive pressure gas tem
-
perature as well as shifting of the refrigerant ignition limit into the
critical range. Avoid absolutely any entry of air!
Use a low pressure switch! Select a shut-off point min. 50 Pa higher
than the prevailing surrounding pressure!
5.1 Refrigerants
• Hydrocarbons:
R290, R1270 (Recommendation quality 2.5 (< 50 ppm H
2
O))
• HFO refrigerants:
R1234ze, R1234yf, R455A, R454C
5.2 Oil charge
The compressors are factory-charged with the following oil type:
• HC compressors:
BOCK lub G68
• LG compressors:
BOCK lub E55
BOCK lub E85
(from
t
O
> 15°C, must be specified in the order)
Maximum permissible operating
pressure
(LP/HP)
1)
: 19/32 bar
1)
LP = Low pressure HP = High pressure
