Table of Contents
[4-2 Outdoor Unit Circuit Board Components ]
(2) PURY-EP500YLM-A
SC-L
CNCT4A
DC bus current input
Electric current sensor
(DC) output
(CT3)
LED5
Lit: Power is supplied to
the relay drive
Unlit: Power is not supplied
to the relay drive
CT-3
Electric current sensor
(DC bus current)
SC-L1
input(L1)
SC-L2
input(L2)
SC-L3
input(L3)
SC-B
DC bus current input
IGBT(Rear)
CT-1
Electric current sensor(U)
SC-U
Inverter output(U)
1) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that
the capacitor voltage (inverter main circuit) has dropped to 20 VDC or less. It takes about 10 minutes to discharge electricity
after the power supply is turned off.
2) Faston terminals have a locking function. Make sure the cable heads are securely locked in place. Press the tab on the ter-
minals to remove them.
3) Control box houses high temperature parts. Be well careful even after turning off the power source.
4) Perform the service after disconnecting the outdoor unit fan board connector (CNINV) and the inverter board con-
nector (CN1). Before plugging in or unplugging connectors, check that the outdoor unit fan is not rotating and that
the voltage between SC-P and SC-N on the capacitor board is 20 VDC or less. The capacitor may collect a charge and
cause an electric shock when the outdoor unit fan rotates in windy conditions. Refer to the wiring nameplate for details.
5) To connect wiring to TB7, check that the voltage is 20 VDC or below.
6) Reconnect the connector (CNINV) back to the fan board and reconnect the connector (CN1) back to the inverter board after
servicing.
7) When the power is on, the compressor or heater is energized even while the compressor is stopped. Before turning on the
power, disconnect all power supply wires from the compressor terminal block, and measure the insulation resistance of the
compressor. Check the compressor for a ground fault. If the insulation resistance is 1.0 MΩ or below, connect all power supply
wires to the compressor and turn on the power to the outdoor unit. It is energized to evaporate the liquid refrigerant that has
accumulated in the compressor.
HWE1314A
FT-R21
Bus voltage output(P)
CNRY
Inrush current limiting
relay input
CT-2
Electric current sensor(W)
SC-V
SC-W
Inverter output(V)
Inverter output(W)
SC-P
Bus voltage output(P)
R001
Oversurrent
detection resistor
F1
Fuse 250 VAC
3.15A
- 102 -
FT001
Neutral point output(P)
CN1
Bus voltage output
N
P
SC-N
Bus voltage output(N)
LED4
Microcomputer in operation
LED1
Lit: Inverter operation
Blinking: Inverter error
CN2
Serial communication
signal output
GND
17 VDC input
17 VDC input
GND
CN43
GND(Fan board)
Serial communication
signal input
CNCT4B
Electric current sensor
(DC) input
(CT-3)
CNTH
DCL thermistor input
CN5V
GND
5 VDC output
CNTYP
INV board Type
SW001
ON: No-load operation
OFF: Normal operation
OFF: Fixed
CN10
Gate power supply input
+
-
GB
Chapters
Table of Contents
Troubleshooting
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