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2WAY SYSTEM
Trouble Diagnosis
6
3. 2WAY Alarm Codes
3WAY SYSTEM
Trouble Diagnosis
4. 3WAY Alarm Codes
H06 Alarm
Alarm code H06
Alarm meaning Abnormal decrease of low-pressure
Alarm conditions
Probable cause (1) Low-pressure sensor failure
(1) Low-pressure sensor failure
(1) Replacement of low-pressure sensor
(2) Correct malfunction of refrigerant cycle.
(2) Failure to open the service valve of the outdoor unit
(4) Insufficiency of refrigerant gas
(5) Refrigerant is accumulated in a state of stop mode of the outdoor units.
(2) Failure to open the service valve of the outdoor unit
(3) Clogged refrigerant circuit
(4) Insufficiency of refrigerant gas amount
(5) Refrigerant is accumulated into the stopped outdoor units.
Check
•
Correction
When replacing a low-pressure sensor, carry out after refrigerant recovering of outdoor unit.
Example
Low-pressure sensor detects lower than 0.06MPa continuously for 2 minutes or lower than 0.02MPa
for just a moment.
•
The alarm had occurred because of refrigerant insufficiency due to gas leak.•
The alarm had occurred when the liquid, suction and discharge tubes were clogged together.•
Remove the socket of low-pressure sensor from the Outdoor Unit Control PCB and measure the
resistance of each wire (×3) and between the outdoor unit and earth.
If this resistance is more than 1MΩ, it indicates normal. If not, replace the sensor.
• Connect a gauge to the low-pressure outlet and check for changes in the value displayed by the
monitoring software, and for large deviation of the gauge pressure.
Check the open/closed status of the service valve.
(3) Check for clogging of the refrigerant circuit.
When clogging in the refrigerant circuit occurs, refrigerant does not return to the compressor.
As a result, low-pressure may occasionally decrease abnormally.
When insufficiency of refrigerant charge amount or of refrigerant amount in the system caused by
gas leakage occurs, low-pressure may occasionally decrease abnormally.
Leakage of expansion valve and solenoid valve in the outdoor unit in stop mode, etc.
Solenoid valve, expansion valve, fleezing caused by contaminated water inside the circuit, etc.
Then check the following points:
Open valve of outdoor unit.
Correct clogging.
•
•
Dissolve insufficiency of refrigerant gas
(Correction of gas leakage area, additional refrigerant, etc.)
•
When charging additionally because of refrigerant insufficiency, add each 500g of refrigerant
little by little.
SM830228-003WAYECO-iSYSTEM.in1818 2013/03/1618:25:21
H07 Alarm
Alarm code H07
Alarm meaning Low oil alarm
Alarm conditions This alarm occurs when oil does not flow for a specified amount of time in tubing where oil
flow constantly. (The presence of oil is detected by a temperature sensor.)
Probable cause Insufficient amount of oil in the system
(1) The length of system tubing exceeds the allowable tubing length.
(2) The difference in height between system units exceeds the allowable value.
(3) A large amount of oil was drained when a compressor was replaced.
(4) Oil has accumulated in a stopped outdoor unit and has not returned, as a result of refrigerant
circuit clogging or valve leakage at the stopped outdoor unit.
(5) A valve (ORVR, ACV, BPV) in the oil circuit has malfunctioned, or there is clogging of the
circuit (capillaries) which returns oil from the oil separator to the compressor.
(6) If an excessive amount or liquid returns to the compressor, oil foaming may increase oil
discharge. The same occurs when the refrigerant proportion in the compressor is high at start,
due to an open circuit in the crank case heater.
(7) Oil sensor disconnected or open circuit
Check (1) Check the tubing length and height differences.
(2) Check the operation of system circuit valves.
(3) Check that there is not an excessive amount of liquid return. (Check that there is no
mechanical valve leakage.)
(4) Check the crank case heater (wintertime).
(5) Check that the oil sensor is not disconnected, and that the circuit is not open.
Correction (1) If insufficient oil is a possibility, then charge with additional oil.
(2) If it is clear that a valve failure has occurred, replace the valve.
Example
Notes
H08, H27 Alarm
Alarm code H08, H27
Alarm meaning H08 : Compressor 1 oil sensor (connection) trouble
H27 : Compressor 2 oil sensor (connection) trouble
Alarm conditions This alarm occurs when a connector connection (pins 1 and 2 for compressor 1, and pins 4
and 5 for compressor 2) is open.
Probable cause Disconnected connector
Check Check that the connector is securely connected.
Correction (1) Connect the connector.
(2) Correct the connection at connector pins 1 and 2, or pins 3 and 4.
Example —
Notes
SM830253-00_欧州2way7_SM-TRSM.indb 17 16/08/02 14:02:50
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