Hitachi SAMURAI Series Service Manual page 130
Condenserless water chillers
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Also See for SAMURAI Series:
- Service manual (174 pages) ,
- Service manual (140 pages) ,
- Manual (118 pages)
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4. Troubleshooting
Analysis and countermeasure of abnormalities
Phenomenon
Discharge
gas over-
increase is
activated
Activation
of over-
current
protection
control for
compres-
sor.
Activation
Chiller
of com-
unit stops
pressor
during
cooling
internal
operation
thermo
Activation
of overcur-
rent relay
for pump
Activation
of anti-
freezing
thermo
123
SMGB0097 rev.0 - 07/2015
Cause
Suction gas temperature is
too high (excessive super
heat)
Failure of thermistor for
control of discharge gas
Single phase operation
Excessive Compressor
operating current
Single phase operation
Faulty compressor bearing
Insulation failure of
compressor motor
Pump locked
Inappropriate RC value of
overcurrent relay for pump
Faulty overcurrent relay for
pump
Insufficient volume of water
Pump inverse rotation
Thermistor abnormality
Faulty frost-proof thermostat
Check Item
Malfunction of check valve
Clogging of expansion valve
Malfunction of the expansion valve
Check connection with a tester
Check electromagnetic switch
Power supply voltage too high or
too low
Phase unbalance in power supply
voltage
Discharge pressure too high
Power source fuse blown
Loosening of terminal-type screws
of power source
Check rough contact of
electromagnetic contactor of
compressor motor
It becomes locked.
Measure insulation resistance
Check frozen water, clogging by
foreign bodies, etc.
Check RC value and pump
operating current
Press reset button.
Check running current
Check cold water inlet/outlet
temperature difference
Check rotational direction
Check cold water inlet temp
Check cold water outlet temp
Action · Countermeasure
Replace check valve
Remove clogging
Replace expansion valve
Replace thermistor for
control of discharge gas
Replace electromagnetic
switch
4
Set voltage during operation
to rated voltage
Measure voltage between
each phase, and consult with
the power company
Investigation to determine
the cause
Replace power source fuse
Retighten screws.
Replace contact
Compressor replacement
Remove
Change RC value or replace
electromagnetic switch
Replace electromagnetic
switch
Increase volume of water.
Fix to correct direction.
Replace Thermistor
Replace frost-proof
thermostat
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