Daikin JEHSCU0500CM3 [9/216] Decommissioning disposal

Daikin JEHSCU0200CM3 [9/216] Decommissioning disposal
4 Decommissioning & Disposal
5. Checklist
6. Service and Maintaintenance
O-CU06-AUG17-3
All specifications are subjected to change by the manufacturer without prior notice. The English text is the original instruction.
Other languages are the translations of the original instructions.
9
The condensing units are designed to give long life operation with
minimum maintenance. However, they should be routinely checked
and the following service schedule is recommended under normal
circumstances:
The removal of the top, side and front panels ensures that all parts
are accessible.
1. Compressor – Inspect at regular intervals
Check for refrigerant leaks on all joints and fittings.
Ensure that no abnormal noise or vibration is detected
during test run.
Check the compressor oil levels and top up if required. The
oil level should not be lower than quarter of the compressor
oil sight glass. Not applicable to AE/AJ compressor.
2. Condenser Coil – Clean and inspect at regular intervals
Remove surface dirt, leaves, fibers, etc. with a vacuum
cleaner (preferably with a brush or other soft attachment
rather than a metal tube), compressed air blown from the
inside out, and/or a soft bristle (not wire!) brush. Do not
impact or scrape the coil with the vacuum tube, air nozzle,
etc. It may be beneficial to blow or vacuum out the rinse
water from MCHE to speed drying and prevent pooling.
3. Power Supply – Inspect at regular intervals
Check the running current and voltage for the condensing
unit.
Check the electrical wiring and tighten the wires onto the
terminal blocks if necessary.
Under normal circumstances:
Clean condenser coil every three months
To assure no leakage
Check and verify operation of all safety devices every three
months, ensure crankcase heater is operational
Check sight glass and operating conditions
Check security of compressor mountings and the bolts that
hold down the unit each year
4. Compact Brazed Heat Exchanger (BPHE)
** For JEHSCU0950CL3 EVI Unit ONLY
Any soldering process done on the heat exchanger needs
to be brazed with minimum 45% silver solder at maximum
450°C ( 840°F) when soft soldering and 450-800°C
(840-1470°F) when hard soldering.
Do not direct flame at BPHE and use wet rag to avoid
overheating of BPHE.
At the end of the unit’s useful life, a suitably qualified engineer should
decommission it. The refrigerant and compressor oil are classed as
hazardous waste and as such must be reclaimed and disposed of in
the correct manner, including completion of waste transfer
paperwork. The unit components must be disposed of or recycled as
appropriate in the correct manner.
Ensure the high low pressure controls are configured properly.
Ensure crankcase heater is energized minimum 12 hours prior
to start up and permanently energized.
Check the refrigerant is correct for intended use.
Check all electrical connections.
Check all electrical termination and circuits are correct.
Check compressor oil level via compressor sight glass, the oil
level should not be lower than quarter of sight glass.
Check the TXV capacity sizing based on indoor unit capacity.
Check TXV applicable refrigerant. Check position and condition
of the sensing bulb fixing
Observed the system pressures during the charging and initial
operation process.
Ensure that suction pressure will decrease, discharge pressure
will increase. No abnormal noise from the compressor.
Continue to charge the system until sight glass is clear. Make
sure that high pressure is > 14 barg for R404A and > 8 barg for
R134a when doing this charge adjustment operation.
Continuous flow of clear refrigerant through the sight glass, with
perhaps an occasional bubble at very high temperature
indicates the refrigerant is at optimum.
Check the compressor’s discharge and suction pressure, to
ensure it is within operating range. Discharge temperature
should be within 50 to 90 °C and pressure should be around 15
to 26 barg (for system charged with R404A) and 8 to 16 barg (for
system charged with R134a).
Check the current of condensing unit and ensure it is below the
motor circuit breaker setting value.
Check condenser fan, ensure warm air blowing off the
condenser coil.
Check evaporator blower, ensure it’s discharging cool air.
Check suction superheat and adjust expansion valve to prevent
liquid flood back to the compressor. Recommended 5 to 20 K of
suction superheat.
Do not leave the system unattended until the system has
reached its normal operating condition and the oil charge has
properly adjusted itself to maintain the proper level in the sight
glass.
Check periodically the compressor performance and all the
moving components during the first day of operation.
Check the liquid line sight glass and expansion valve operation.
If there is an indication that the system is low on refrigerant,
thoroughly check the system for leaks before adding refrigerant.
Important Note
Warning! – Disconnect the mains electrical supply before
servicing or opening the unit
Warning! – Ensure there is no refrigerant in refrigerant circuit
before dismantle it
Warning! – If the supply cord is damaged, it must be
replaced by the qualified service agent in order to avoid a
hazard.
Important Note
For scroll compressor: wiring for 3 phases must be
controlled. Supply phase sequence L1, L2 and L3 will affect
the rotating direction of scroll compressor and damage the
compressor.
Service technician should be present at initial start- up to
verify that the supply power is properly phased and that
compressor is rotating in the correct direction.
ENGLISH

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