A Shutting Down For Long Periods; A Routine Maintenance; A Special Maintenance; A Disposal - Mitsubishi Electric CLIMAVENETA BRAN2 0021M Installation, User And Maintenance Manual

SHUTTING DOWN FOR LONG PERIODS
After deactivating the chiller:
- Make sure the remote switch SA1 (if featured) is off.
- Make sure the remote keypad (if featured) shows "OFF".
- Place QF1 in the OFF position (see wiring diagram)
- Deactivate the indoor terminal units by placing the switch
of each unit in the "OFF" position.
- Close the water valves.
ROUTINE MAINTENANCE
Never perform any cleaning operations before having
disconnected the unit from the mains power supply.
Terminals 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 may be
live even when the unit has been disconnected.
Make sure power is not connected before proceeding.
Regular maintenance is fundamental to maintain the effi-
ciency of the unit both in terms of operation and energy con-
sumption.
The Technical Service maintenance plan must be observed,
with an annual service which includes the following opera-
tions and checks:
- Filling of the water circuit;
- Presence of air bubbles in the water circuit
- Efficiency of safety devices
- Power supply voltage
- Power consumption
UNSCHEDULED MAINTENANCE
Never perform any cleaning operations before having
disconnected the unit from the mains power supply.
Terminals 10, 11, 12, 13, 14, 15, 16, 17, 18 and 19 may be
live even when the unit has been disconnected.
Make sure power is not connected before proceeding
CHEMICAL WASHING
It is recommended to chemically flush the plate heat
exchanger after every 3 years of operation.
For instructions on how to carry out this operation, call the
toll free number.
REFRIGERANT GAS CONTENT
The chillers are charged with R-410A refrigerant gas and
tested in the factory.
In normal conditions, there should be no need for the Tech-
nical Service to intervene to check the refrigerant gas.
However, over time, small leaks may develop at the joints
leading to loss of refrigerant and draining of the circuit,
causing the unit to function poorly.
In this case, the leaks of refrigerant must be identified and
repaired and the refrigerant circuit recharged.
Proceed as follows:
- Empty and dry the entire refrigerant circuit using a vacuum
pump connected to the low and high pressure tap until the
vacuometer reads about 10 Pa.
Wait a couple of minutes and check that this value does
not rise to more than 50 Pa.
- Connect the refrigerant gas cylinder or a filling cylinder to
DISPOSAL
The unit must be disposed of according to the legislation in force in the country concerned.
32 BRAT2 - BRAN2 EN
If the mains switch is turned to "off" for more than four
hours, after turning it on and before reactivating the unit,
leave the power on but the unit deactivated for at least
two hours to preheat the oil in the compressor sump.
- Tightness of electrical and water connections
- Condition of the compressor contactor
- Verification of operating pressure, superheat and subcool-
ing
- Efficiency of the compressor heater
During the maintenance operations, the chiller inspection
panel may need to be removed.
If this is the case, proceed as follows:
- Open the door of the electrical panel.
- Undo the screws as shown in the figure
- Remove the inspection panel
To replace the inspection panel, repeat the procedure in
reverse.
the low pressure line pressure gauge connection.
- Charge the quantity of refrigerant indicated on the unit's
rating plate.
- Always check the superheat and subcooling values, which
should be between 5 and 10 °C and 4 and 8 °C.
- After a couple of hours operation, check that the liquid
indicator indicates a dry circuit (dry-green).
In the event of partial leaks, the circuit must be com-
pletely emptied before being recharged.
The R-410A refrigerant must only be charged in the liq-
uid state.
Operating conditions other than rated conditions may
produce considerably different values.
Tightness testing or identification of leaks must only be
carried out using -R410A refrigerant gas, checking with a
suitable leak detector.
The refrigerant circuit must not be charged with a
refrigerant other than that indicated.
The use of a different refrigerant may cause serious
damage to the compressor.
Oxygen, acetylene or other flammable or poisonous gas-
es must never be used in the refrigerant circuit as they
may cause explosion or poisoning. Oils other than those
indicated on page 16 must not be used.
The use of a different oil may cause serious damage to
the compressor.
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