TROUBLESHOOTING
12.
TROUBLESHOOTING
12.1
ELECTRICAL & CONTROL TROUBLESHOOTING
12.1.1
Precautions before Performing Inspection or Repair
Be cautious during installation and maintenance. Do operation following the regulations to
avoid electric shock and casualty or even death due to drop from high attitude.
*
Static maintenance
is the maintenance during de-energization of the air conditioner.
For static maintenance, make sure that the unit is de-energized and the plug is disconnected.
*
Dynamic maintenance
is the maintenance during energization of the unit. Before dynamic
maintenance, check the electricity and ensure that there is ground wire on the site. Check if
there is electricity on the housing and connection copper pipe of the air conditioner with voltage
tester. After ensure insulation place and the safety, the maintenance can be performed.
Take sufficient care to avoid directly touching any of the circuit parts without first turning off the
power. At time such as when the circuit board is to be replaced, place the circuit board
assembly in a vertical position. Normally,diagnose troubles according to the trouble diagnosis
procedure as described below.(Refer to the check points in servicing written on the wiring
diagrams attached to the indoor/outdoor units.)
Precautions when inspecting the control section of the outdoor unit
:
A large-capacity electrolytic capacitor is used in the outdoor unit controller
(inverter).Therefore,if the power supply is turned off, charge(charging voltage DC280V to
380V)remains and discharging takes a lot of time. After turning off the power source,if touching
the charging section before discharging, an electrical shock may be caused.
The outdoor unit can not be started up until the unit is de-energized for 20min
12.1.2 Confirmation
12.1.2.1 Confirmation of Power Supply Confirm that the power breaker operates(ON)
normally;
12.1.2.2 Confirmation of Power Voltage Confirm that power voltage is AC220~240V +/-
10%. If power voltage is not in this range, the unit may not operate normally.
SM HGD-009/012 1-A.1 GB
12-1
