System Maintenance; General; Compressor Maintenance; Lubrication - Daikin EWYD-BZ Series Installation, Maintenance & Operation Manual

System maintenance

All routine and extraordinary maintenance activities on the machine must be carried out solely by qualified personnel who
are familiar with the machine characteristics, operation and maintenance procedures, and who are aware of the safety
requirements and risks involved.
The causes of repeated shutdowns deriving from triggering of safety devices must be investigated and corrected.
Re-starting the unit after simply resetting the alarm can seriously damage the equipment.
A correct refrigerant and oil charge is essential for optimal operation of the machine and for environmental protection.
Any oil and refrigerant recovery must conform to legislation in force.

General

Besides the checks suggested in the routine maintenance program, it is recommended to schedule periodical
inspections, to be carried out by qualified personnel, as follows:
4 inspections per year (1 every 3 months) for units running about 365 days per year;
2 inspections per year (1 at seasonal start-up and the second one in the middle of the season) for units running about
180 days per year with seasonal operation.
1 inspection per year for units that run for a season of approximately 90 days/year (at seasonal start-up).
It is important that during initial start-up and periodically during operation, routine verifications and checks are performed.
These must also include verification of suction and condensation pressure. Verify through the built-in microprocessor that
the machine operates within the normal superheating and subcooling values. A recommended routine maintenance
programme is shown at the end of this chapter while a form for collecting operational data can be found at the end of this
manual. Weekly recording of all the machine's operating parameters is recommended. Collecting this data will be very
useful to the technicians in the event that technical assistance is called for.

Compressor maintenance

Since the compressor is of the semi-hermetic type, it requires no scheduled maintenance. However, for granting the
highest levels of performance and efficiency and for preventing malfunctions, it is recommended that a visual check for
wear in the satellite and clearances between main screw and the satellite is carried out every 10.000 running hours.
Such inspection has to be carried out by qualified and trained personnel.
The analysis of vibrations is a good method for verifying the mechanical conditions of the compressor.
Verification of vibration readings immediately after start-up and periodically on an annual basis is recommended. The
compressor load must be similar to the previous measurement's load to ensure measurement reliability.

Lubrication

The units do not require a routine procedure for lubrication of components. The fan bearings have permanent lubrication
and no additional lubrication is therefore required.
Compressor oil is of the synthetic type and is highly hygroscopic. It is therefore advised to limit its exposure to the
atmosphere during storage and filling. It is recommended that the oil be exposed to the atmosphere for no more than
10 minutes.
The compressor oil filter is located under the oil separator (delivery side). Its replacement is advised when its pressure
drop exceeds 2.0 bar. The pressure drop across the oil filter is the difference between the compressor discharge
pressure and the oil pressure. Both these pressures can be monitored through the microprocessor for both compressors.
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WARNING
WARNING
WARNING
IMPORTANT
IMPORTANT