![background image](http://html.mh-extra.com/html/midea/lsblg-mcf-series/lsblg-mcf-series_technical-and-service-manual_1790905005.webp)
Flooded type water cooled screw chiller (MIC)
MCAC-CTSM-2018-1
4
(1)
Engineers working on electric or refrigeration components must be authorized, trained and fully
qualified to do so. All refrigerant circuit repairs must be carried out by trained personnel fully
qualified to work on these units. He must have been trained and be familiar with the equipment and
the installation. All welding operations must be carried out by qualified specialists.
(2)
The insulation must be removed and heat generation must be limited using a wet cloth. Any
manipulation (opening or closing) of a shut-off valve must be carried out by a qualified and
authorized engineer. These procedures must be carried out with the unit shut-down.
NOTE:
During any handling, maintenance or service operations the engineers working on the unit must
be equipped with safety gloves, glasses, shoes and protective clothing.
(1)
Never work on a unit that is still energized.
(2)
Never work on any of the electrical components, until the general power supply to the unit has been
cut using the disconnect switch in the control box.
(3)
If any maintenance operations are carried out on the unit, lock the power supply circuit in front of the
machine.
(4)
If the work is interrupted, ensure that all circuits are de-energized before resuming work.
ATTENTION:
Even if the unit has been switched off, the power circuit remains energized, unless the unit
or circuit disconnect switch is open. Refer to the wiring diagram for further details. Attach appropriate
safety labels.
2.2 Operating checks:
Important information regarding the refrigerant used:
Refrigerant type: R134a
Periodic inspections for refrigerant leaks may be required depending on local legislation. Contact
your local dealer for more information.
During the service life of the system, inspection and tests must be carried out in accordance with
national regulations.
2.3 Safety device checks:
The safety devices and external overpressure devices (safety valves) must be checked on site
regularly.
At least once a year thoroughly inspect the protection devices (valves). If the machine operates
regularly carry out leak tests and immediately repair any leaks.
Ensure regularly that the vibration levels remain acceptable and close to those at initial unit start-up.
Before opening a refrigerant circuit, purge and check the pressure gauges.
Change the refrigerant when there are equipment failures. Follow related regulations or carry out a
refrigerant analysis in a specialist laboratory.
If the refrigerant circuit remains open for longer than a day after an intervention (such as a
component replacement), the openings must be plugged in and the circuit charged with nitrogen
(inertia principle). The objective is to prevent penetration of atmospheric humidity and resulting