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4.4.2.
High-pressure monitoring
If the high pressure in the refrigeration circuit of your machine increases to a maximum value, the
compressors are switched off via the high-pressure limiter
(see
Chapter 4.4.1 High-pressure limiter
). A
manual reset is required.
The high-pressure monitoring on the other hand reduces the compressor output before the PZH's switch-off
value is reached. This is done by successive switching off of one or more compressors. A message is output
at the control panel. When the high pressure has reduced to a minimum value of 31.5 bar, the compressors
are released once more. In most cases partial shutdown of the compressors enables operation of the chiller
to be maintained with reduced output.
If the high-pressure monitor has triggered, please follow the instructions in the Chapter Troubleshooting
(see
Appendix Fehler! Verweisquelle konnte nicht gefunden werden.
).
4.4.3.
Low-pressure monitoring
If the low-pressure in the refrigeration circuit of your system is too low for the specified cooling medium there
is a risk of freezing. For this reason the low pressure is monitored continuously and if it falls below a minimum
value, one or more compressors are switched off successively. A message is output at the control panel. If
the low pressure has increased to a minimum value the compressors are released once more. In most cases
partial shutdown of the compressors enables operation of the chiller to be maintained with reduced output.
If the low-pressure monitor has triggered, please follow the instructions in the Chapter Troubleshooting
(see
Appendix Fehler! Verweisquelle konnte nicht gefunden werden.
).
4.4.4.
Flow monitoring
If the volumetric flow of the cold water which is pumped through the evaporator is too low, there is a risk of
freezing. For this reason the flow through the evaporator is monitored continuously. If the volumetric flow
rate is only around 50 % of the nominal volumetric flow rate, the message "Flow warning" appears.
If the rate falls below the minimum value of 20 % the compressors are switched off and the message "Flow
stop" appears. In this case, please follow the instructions in the Chapter Troubleshooting
(see
Appendix
Fehler! Verweisquelle konnte nicht gefunden werden.
).
4.4.5.
Personal protective equipment when operating the machine
Operating the machine involves making settings at the control panel. During operation of the machine its
cover panels are installed, the machine is completely enclosed. No protective equipment is needed.
We recommend ear protectors be worn by persons with jobs that require them to be continuously in the
immediate vicinity of the chiller. Please refer to the sound emission information included in the technical
data.
