Daikin EWWQ-AJYNN Service Manual page 125

ESIE07-05
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Direct Expansion ■
Water-cooled
chillers
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Part 5 – Maintenance
Check the operation of all safety devices, either by adjusting the operating conditions to cause an
alarm, or by changing the alarm setpoint.
Repeat for all other circuits, one at a time. And then with all circuits together.
When the unit is operating correctly with all circuits, and as close to design conditions as possible,
take a full log and record the final software settings. Complete the standard log sheet and return
to Daikin Europe Service Department.
Make a note of any anomalies in the operating conditions or application.
Check that the unit is acceptable to the client and establish with him that the warranty starts from
this date, preferably in writing.
IF IN DOUBT CALL DAIKIN EUROPE SERVICE DEPARTMENT
Once delivered to site, ensure that the installation instructions are followed carefully: particularly
the correct lifting and moving of the unit, spacing from walls and other chillers, pipework
connections etc.
Check the correct positioning of anti-vibration mounts (if fitted) and check that any devices for
transportation are removed.
Make a close visual inspection of the chiller for transport damage and general condition. Inform the
Daikin Europe Logistic Department in case of transport damage.
Carry out a refrigerant leak check of the whole unit, report and fix any leaks.
Check that there is a suitable strainer in the water-pipes to the evaporator and condenser and that
all pipes are full of water and purged of air. At no time must the water flow exceed 120% of the
design figure.
Check that the main power cables have been installed correctly, with the correct phase rotation,
with no mechanical strain on the terminals and correctly glanded in the electrical panel entry plate.
Opening the power and control sections of the panel, make a visual inspection for damage or
omissions. Check the tightness of all accessible cable terminations.
Remove the main compressor fuses and apply power to the panel. Check functioning of the Carel
controller. Make any required changes to default settings. Make a written record of all set-up
parameters.
Using calibrated gauges and thermometer, check the calibration of all pressure transducers and
temperature sensors. Re-calibrate as necessary.
Carry out a 'dry run' of the start sequence and check correct functionality.
Check all refrigerant service valves and ensure that they are in the correct position for normal
operation
Start evaporator pump and check for correct water flow by measuring evaporator pressure drop.
Correct as necessary by throttling the water in the evaporator outlet or by other means if available.
Check correct operation of flow switch.
Start condenser pump and check for correct water flow by measuring condenser pressure drop.
Correct as necessary by throttling the water in the condenser outlet or by other means if available.
Check correct operation of flow switch if fitted.
Check the correct functioning of whatever means the client is using to control condenser water inlet
temperature.
Check evaporator water inlet temperature. If it is above the maximum catalogue value ensure that
the 'soft-load' and/or 'high temperature start' and/or EXV MOP features are enabled to ensure safe
operation. If these features are not available, and it is not possible to reduce the water temperature,
either operate the compressor capacity control manually or consider the possibility to reduce the
water flow temporarily to ensure that the suction pressure is not too high. If in any doubt, consult
Daikin Europe Service Department.
Appendix B
1
3
6
5
6–21