GEA Bock FK20 - Manual (Page 8)

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3| Areas of application
ATTENTION! Compressor operation is possible within the limits of application
shown in the diagrams. Please note the significance
of the shaded areas. The limits of application must
be observed. Thresholds should not be selected as design
or continuous operating points.
- Max. permissible discharge end temperature: 140°C
- Max. permissible ambient temperature: 100°C
- Max. permissible switching frequency: 12 x /h
- A minimum running time of 2 min. at equilibrium (continuous
operation) must be achieved.
Avoid continuous operation near the threshold. Should the
compressor happen to be used near the thresholds, we
recommend the use of a thermal protection thermostat
(Accessories, Chap. 7).
When operating in the vacuum range, there is a danger of air
entering on the suction side. This can cause chemical reactions,
a pressure rise in the condenser and an elevated compressed-
gas temperature. Prevent the ingress of air at all costs!
The compressors are factory-filled with the following oil type:
- for R134a, R404A/R507, R407C FUCHS Reniso Triton SE 55
- for R22 FUCHS Reniso SP 46
Compressors with ester oil charge (FUCHS Reniso Triton SE 55) are marked with an X in the type designation
(e.g. FK
X20/170 N).
3.1 Refrigerants
• HFKW / HFC:
R134a, R404A/R507, R407C
• (H)FCKW / (H)CFC: R22
3.2 Oil charge
3.3 Limits of application
INFO! For recharging, we recommend the above oil types. Alternatives are:
see lubricants table , Chapter 6.4.