Code
number
Category Type of abnormality Main cause
b1
Number setting
Incorrect setting address or refrigerant cycle Over 64 indoor units setting by number or indoor unit address.
b5
Incorrect setting of indoor unit number for
H-LINK type
The number of indoor units connected to the H-LINK II of one
system is 17 or higher.
Alarms for LCD
Alarm
Code
Retry
Stop
Code
Yutaki
S/SC
Yutaki
S80
Yutaki
M
Origin Detail of Abnormality Main Factors
202 (o) (o) (o) LCD Wrong settings of PC-ARFHE
203 (o) (o) (o) LCD
Slave PC-ARFHE stops answering
to Master PC-ARFHE
Loose, disconnected, broken or
short-circuited connector
204 (o) (o) (o) LCD
Indoor unit stops answering to
Master PC-ARFH
Loose, disconnected, broken or
short-circuited connector
205 (o) (o) (o) LCD Central Alarm, no Central message
Loose, disconnected, broken or
short-circuited connector
10 MAINTENANCE
10.1 MAINTENANCE WORK
! CAUTION
• All inspections and checks have to be carried out by a licensed technician and never by the user itself.
• Before any inspection and check the unit main power supply has to be switched OFF.
• Wait a minimum off 10 minutes from all power supply have been turned OFF.
• Take care with the crankcase heater. It could operate even when compressor is OFF.
• Take care with the electrical box components. Some of them could remain hot after switching OFF the unit.
? NOTE
All these maintenance operations must be done with appropriate materials and following this manual.
10.1.1 General maintenance procedure for the outdoor unit
1 Fan and fan motor
• Lubrication: All the fan motors are pre-lubricated and sealed at factory. Therefore no lubrication maintenance is required.
• Sound and vibration: Check for abnormal sounds and vibrations.
• Rotation: Check the clockwise rotation and the rotating speed.
• Insulation: Check the electrical insulation resistance.
2 Heat exchanger
• Clog: Inspect the heat exchanger at regular intervals and remove any accumulated dirt and any accumulated dust from the heat
exchanger. Other obstacles must be removed such as the growing grass and the pieces of paper which might restrict the airow.
3 Refrigerant piping connection
• Leakage: Check for the refrigerant leakage at the piping connection between the outdoor and the indoor unit.
• Pressure: On split system, check the R-410A refrigerant pressure using the check joints of the outdoor unit.
4 Cabinet
• Stain: Check for any stain and remove it cleaning if it is the case.
• Fixing screw: Check for any loosened screw or any lost screw. Fix the loosened screws and the lost screws.
• Insulation material: Check for any peeled thermal insulator on the cabinet. Repair the thermal insulator.
5 Electrical equipment
• Activation: Check for an abnormal activation of the magnetic contactor, the auxiliary relay, the PCB and others.
• Line condition: Pay attention to the working voltage, the working amperage and the working phase balance. Check for any faulty
MAINTENANCE
PMML0335A rev.1 - 04/2016
174
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