Hitachi Utopia RPI-2.5HRG - Page 24

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TROUBLESHOOTING
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Activation of
High Pressure
Switch due to
Excessively
High Discharge
Pressure
Check for clogging. Remove clogging.
Check connecting
wiring and connectors.
Replace connector.
Check operating sound
from coil.
Replace coil.
Check discharge gas
thermistor.
Check attaching
state of discharge
gas thermistor.
Replace thermistor.
Reattach thermistor.
Faulty or Malfunction of
Expansion Valve
Check cycle operating
temp. and expansion
valve opening.
Charge refrigerant
correctly.
Overcharged Refrigerant
Check ambient temp.
and pressure.
Recharge refrigerant
after vacuum pumping.
Mixture of Non-Condensable
Gas in Refrigerant Cycle
Check for clogging. Remove clogging.Clogging of Discharge Piping
Check stop valves. Fully open stop valve.
Liquid Line Stop Valve or
Gas Line Stop Valve are
not in Operation