Hitachi RCUE100AG2 User Manual

SMGB0003 rev.0 - 01/2007
pag. 144
Troubleshooting
Unit is running,
but the cooling
capacity is
insuffi cient
The heat load is bigger than cooling capacity
The heat load is bigger than cooling capacity
The heat load is bigger than cooling capacity
The heat load is bigger than cooling capacity
Calculate heat load
Calculate heat load
Calculate heat load
Replace to larger unit
Replace to larger unit
Low pressure is excessively
low.
(Low-pressure control is
activated)
(▪ ▪ ▪ ▪ ▪ )~(▪ ▪ ▪ ▪ ▪
alarm)
Gas leakage or shortage
Gas leakage or shortage
of refrigerant
of refrigerant
Check super-heat.
Charge correct quantity after
Charge correct quantity after
checking gas leakage
checking gas leakage
Expansion Valve
Clogging
Clogging
Check clogging
Remove clogging
Strainer Clogging
Check to make sure that no difference
Check to make sure that no difference
of temperature before and after of the
strainer exists.
strainer exists.
Replace strainer
Low pressure Piping
Clogging
Clogging
Check to make sure that no difference
Check to make sure that no difference
of temperature between piping exists.
of temperature between piping exists.
Remove clogging
Check Valve Malfunction
Check to make sure that no difference
Check to make sure that no difference
of temperature before and after of
check valve exists.
check valve exists.
Replace check valve
Shortage of water fl ow
Check the difference of temperature
Check the difference of temperature
between inlet and outlet of chilled
water
water
Increase water fl ow
Clogging of Water Strainer
Clogging of Water Strainer
Clogging of Water Strainer
Replace or clean the strainer
Replace or clean the strainer
Pump Reverse Rotation
Pump Reverse Rotation
Check the rotation direction
Check the rotation direction
Check the rotation direction
Repair to the correct direction
Repair to the correct direction
Air Mixed
Air Mixed
Open the air vent valve
Open the air vent valve
Open the air vent valve
Evacuate the air
Evacuate the air
Deposits on water cooler
plates
plates
Check the scales inside of water cooler
Clean water cooler
High pressure is
excessively high
(High-pressure switch is
activated)
(▪ ▪ ▪ ▪ ▪ )~(▪ ▪ ▪ ▪ ▪
alarm)
Air fl ow shortage in air-
side heat exchanger
Excessive dust in air-side heat
exchanger
exchanger
Remove it.
Inlet or outlet of air-side heat
Inlet or outlet of air-side heat
exchanger is clogged
exchanger is clogged
Shortage of Service Space for chiller
Shortage of Service Space for chiller
unit
unit
Secure the service space
Reverse Rotation of Fan Motor
Reverse Rotation of Fan Motor
Reverse Rotation of Fan Motor
Correct the wiring of fan motor
Correct the wiring of fan motor
Correct the wiring of fan motor
Air temperature through
air-side heat exchanger
is high
Air Short-circuits in Chiller Unit
Repair short-circuit.
Another Heat Source around the
Another Heat Source around the
Chiller Unit
Chiller Unit
Remove heat source
Refrigerant Excessive
Refrigerant Excessive
charge
charge
Check cycle temperature
Charge the correct quantity
Non-condensable Gas in
the Refrigerant Cycle.
Turn off the unit and check the relation
between water temperature and
pressure
pressure
Evacuate and charge
refrigerant again
High Pressure Pipe
Clogging
Clogging
Check clogging
Remove clogging
Expansion Valve
Clogging
Clogging
Check clogging
Strainer Clogging
Check to make sure that no difference
Check to make sure that no difference
of temperature before and after
strainer exists
strainer exists
Replace strainer.
Check valve mal-function
Check to make sure that no difference
Check to make sure that no difference
of temperature before and after check
valve exists.
valve exists.
Replace check valve.
Compressor Failure
Check pressure, cycle temperature,
and current
Replace compressor.
Unit is running,
and it makes a
noise.
Propeller-fan contacts with shroud
Investigate
Adjust the position of propeller
Adjust the position of propeller
fan
fan
Noise from compressor
Installation error or
loose bolt
loose bolt
Check each bolt if loosen
Tighten up.
Liquid Compression
Check suction gas temperature,
Check suction gas temperature,
pressure
pressure
Ensure superheat
Oil hammer
Check suction gas temperature and
Check suction gas temperature and
oil level
oil level
Replace compressor
No-current to oil heater
at compressor stopping
at compressor stopping
Check the current to oil heater.
Replace oil heater.
Worn or damaged part in
the compressor
the compressor
Noise from inside of compressor
Replace compressor.
Beats of magnetic contactor
Beats of magnetic contactor
Beats of magnetic contactor
Beats of magnetic contactor
Beats of magnetic contactor
Beats of magnetic contactor
Beats of magnetic contactor
Check the roughness of contact
Check the roughness of contact
Check the roughness of contact
Replace contact points
Replace contact points
Vibration of cabinet
Vibration of cabinet
Vibration of cabinet
Vibration of cabinet
Vibration of cabinet
Vibration of cabinet
Vibration of cabinet
Check screws if loosen
Check screws if loosen
Check screws if loosen
Tighten up
Tighten up

Hitachi RCUE100AG2 Specifications

General

Brand	Hitachi
Model	RCUE100AG2
Category	Chiller
Language	English