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117
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'14 • KX-SM-221
Precautions for Safety
●
Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows:
WARNING
Indicates an imminently hazardous situation which will result in death or serious injury
if proper safety procedures and instructions are not adhered to.
CAUTION
Indicates a potentially hazardous situation which may result in minor or moderate injury
if proper safety procedures and instructions are not adhered to.
WARNING
●
Securely exchange the PCB according to this procedure.
If the PCB is incorrectly exchanged, it will cause an electric shock or fire.
●
Be sure to check that the power source for the outdoor unit is turned OFF before exchanging the substrate.
The PCB exchange under current-carrying will cause an electric shock or fire.
●
After finishing the PCB exchange, check that wiring is correctly connected with the PCB before power
distribution. If the PCB is incorrectly exchanged, it will cause an electric shock or fire.
CAUTION
●
Band the wiring so as not to tense because it will cause an electric shock.
.
Exchange the inverter PCB (Fig.1) according to the following procedure.
1
. Exchange the PCB
after elapsing 3 minutes from power OFF
.
2
. In the situation that harnesses are connected to control PCB,
be sure to measure voltage (DC) of two places ((A), (B))
and check that
the voltage is discharged sufficiently. (
Refer to Fig.2)
3
. Remove the harnesses from bands, clips and connectors on the control PCB. Then, remove the appointed screws (4 places)
of a controller.(Refer to Fig.3)
4
. Open main layer and
measure voltage (DC) of a place (C)
and check that
the voltage is discharged sufficiently.
(Refer to Fig.4)
5
. Disconnect connectors from the inverter PCB (Refer to Fig.1), remove a snubber capacitor (Refer to Fig.4)
and harnesses (”P”,”N”,”U”,”V” and ”W”), and exchange the inverter PCB then..
In the situation of being opening main layer, do not press the controller from above.. It will cause the product deformation or injury.
6
. Match the setting of switches (JSW10, 11) of new PCB with former PCB.
7
. After exchanging the inverter PCB, install the snubber capacitor to power transistor (Refer to Fig.5), and reconnect
the connectors and the harnesses as before. (Confirm the
connectors are not half inserted
.)
Be careful not to pinch the wiring at the time of closing main layer. The wiring is damaged, and it will cause a short circuit or fire.
!
Fig.1 Parts arrangement view of inverter PCB
CNI2
CNR
JSW10,11
Connectors are not half inserted
After elapsing 3 minutes from
power OFF
CNA
Parts No
.
PCB012D057A
2.5 Outdoor unit inverter PCB replacement procedure
