Harmonic Filter Evaluation - Daikin MAGNITUDE WMT Installation Operation & Maintenance

STARTUP AND MAINTENANCE
Clean and Leak Test
evaporator tubes
Eddy Current Test - tube
wall thickness
Seasonal Protection
Clean Flow Sensor
V . Chiller Unit
Run Test/Performance
Evaluation
Leak Test entire unit
General Appearance:
1. Paint/Corrosion
2. Insulation
VI . Electrical
Check and record line
voltage
Inspect power com-
ponents for signs of
overheating
Check and tighten unit
electrical components
Check all panels for
cleanliness - remove
dust and debris from
electrical boards and
connections
VII . Purge Unit
Check purge unit panel
O
for faults
Check and record purge
unit pump-out times and O
purge count
Check electrical con-
nections
Check for normal op-
eration
Key:
O = Performed by owner personnel
X = Performed by qualified service personnel
* = 5 year recommendation
IOM 1297
X
X
X
X
X
X X
X
X
X
X
X
X
X
X
X
X

Harmonic Filter Evaluation

If the optional harmonic filter is provided with the chiller,
measuring the current in each of the three phases of the
capacitor circuit may help determine the condition of the
capacitors. If the input phase currents are within a 5% match to
each other and approximately 30% of filter current rating, the
capacitors can be assumed to be in good working condition.
Phase currents that are imbalanced, may indicate a capacitor
failure. Testing should be done whenever the unit appears to be
operating in an abnormal state.
When the unit is off, the harmonic filter may be checked for
resistance levels. Using a multi-meter (set to read 100K ohms) to
check the phase-to-phase isolation, the reading should be about
40K (total equivalent bleeder resistance value) and should be the
same for each phase. Open circuit or very low readings indicate
X
an issue. Also check phase-to-chassis resistance as low readings
indicate a ground fault problem.
X
X
X
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