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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 appears 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 Troubleshooting chapter (see Appendix 0).
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 appears 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 Troubleshooting
chapter (see Appendix 0).
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 Troubleshooting
chapter (see Appendix 0).
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 cladding 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.
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