Limits Of Application - GEA Bock EX-HG88e Series Assembly Instructions Manual

3 | Areas of application

3.4 Limits of application

ATTENTION Compressor operation is possible within the operating limits.
These can be found in GEA Bock compressor selection tool (VAP)
under vap.gea.com. Observe the information given there.
- Max. permissible discharge end temperature 140 °C.
- Max. permissible switching frequency 12 x / h.
- A minimum running time of 3 min. steady-state condition
(continuous operation) must be achieved.
Suction gas overheating ∆t
The correct setting of the suction gas overheating temperature
∆t
at the compressor entrance is of decisive importance:
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Too low ∆t => danger of liquid operation
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Too high ∆t
=> danger of compressor overheating
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∆t
min = 7 - 10 K, individual adjustment required.
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Permissible ambient temperature range −20 °C to +60 °C.
Permissible ambient temperature range when using a capacity
regulator: −20 °C bis +50 °C.
Avoid continuous operation near the limits.
For operation with capacity regulator:
- Continuous operation, when the capacity regulator is activated,
is not permissible and can cause damage to the compressor.
- The suction gas superheat temperature may need to be reduced
or set individually when operating near to the threshold.
- When the capacity regulator is activated, the gas velocity in the
system can not under certain circumstances ensure that suf-
ficient oil is transported back to the compressor.
For operation with frequency converter:
- the maximum current and power consumption may not
be exceeded. During operation above the mains frequency
the application limit can be restricted.
Variable frequency range: 25 - 60 Hz.
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
temperature as well as shifting of the refrigerant ignition limit into
the critical range. Avoid absolutely any entry of air!
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