GEA Bock FK50 - 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 capacity regulators are used, the limits of application can
move.
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
X50/775 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 6.5.