Stulz CQO 1102 ASF, Оригинальное руководство пользователя

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© STULZ GmbH – all rights reserved EN/06.2018/G42
cybercool 2 scroll original insTrUcTions
Green --> ok.
Yellow --> humidity critical.
With too much humidity in the circuit, the expansion valve can freeze.
In addition to this, the ester oil in the compressor, which gets in
touch with the refrigerant, takes up humidity and loses its ability to
lubricate.
• Take an oil sample, determine the humidity content and exchange
the oil in case of excessive humidity content.
• In this case evacuate the refrigerant completely and recharge it
according to the above described evacuation instruction.
Sight glass
Exchange of the filter drier
To exchange the filter drier it is sufficient to evacuate the pipe section in
which the filter drier is installed.
• Close the shut off valve at the liquid receiver and the valve in the liquid
line upstream the expansion valve.
• By the service valve on the lid of the filter drier, you can evacuate the
refrigerant from the section.
• Remove eight M8 screws at the front side and pull out the cartridge.
• Introduce a new cartridge and refill the evacuated refrigerant.
• Open the shut off valves.
Filter drier, service valve
HP switch
(high pressure limiter)
When the HP limiter triggers, the compressor is switched off without delay. Before the restart and after the
elimination of the error, the HP switch must be reset by pressing the red reset button.
A check of the tripping function of the high pressure limiter (e.g. by cutting down the condenser fan and forc
-
ing a high pressure) is not possible without difficulties, as there are, on behalf of the C7000 controller, further
monitoring functions via the high pressure sensor, which intervene in the compressor control (high pressure
management).
LP switch
Check the correct function of the low pressure switch by stepwise closing the expansion valve of one refriger -
ant circuit using the manual mode of the C7000 controller, while the compressor is running. Check by means
of a pressure gauge connected at the low pressure side in the compressor section, whether the low pressure
switch trips at 3 bar. When the LP switch trips, the compressor is switched off without delay.
After the compressor pause (default setting: 180 sec.) has elapsed the compressor is restarted. During the
evaluation delay (default setting: 120 sec., possibly raise on 300 sec.) you can stepwise open the expansion
valve in manual mode, until you reach a suction pressure of 6 bar (check by suction pressure gauge).