Hitachi Utopia PAS-3HVRG, Руководство по обслуживанию

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1-15
TROUBLESHOOTING
(1.1.6 Abnormalities of Devices)
Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Excessively
High
Discharge
Pressure
Insufficient
Heating
Operation
Check whether or not
short-circuited air exists. Remove cause of
short-circuited air.
Excessively
High Air
Temp. to
Indoor Unit
Heat
Exchanger
Check expansion valve
opening. Correctly charge
refrigerant.
Excessively
Charged
Refrigerant
Check for clogging. Remove clogging.
Clogging of
Discharge
Pr. Piping
Check each temp.
and pressure. Recharge refrigerant
after vacuum pumping.
Non-
Condensate
Gas in Ref.
Cycle
Check for filter clogging. Remove clogging.
Check for any obstacles
at inlet or outlet of
indoor unit.
Remove obstacles.
Check indoor fan speed. Replace fan motor.
Insufficient
Air Flow to
Indoor Unit
Heat
Exchanger
Check temp. difference
between inlet and outlet
of 4-way valve. Excessively
High Suction
Pressure
Replace failed
expansion valve of
indoor unit.
Replace 4-way valve.
Malfunction
or Internal
Leakage of
4-Way Valve
Check temp. difference
between inlet and outlet
of 4-way valve.
Replace 4-way valve.
Malfunction or Internal
Leakage of 4-Way Valve
Check temp. difference
between inlet and outlet
of check valve.
Replace check valve.
Malfunction of Check Valve
of Outdoor Unit
Check for expansion
valve of indoor unit in
the same system.
Discharge Temp. of
Indoor Unit is Unstable.