Table of Contents
[8-11 Control Circuit ]
8-11-2
Troubleshooting Problems with Outdoor Unit Transmission Power Supply
Circuit
1) PURY-P200 - P500YLM-A(1), PURY-EP200 - EP450YLM-A
Check the voltage at the indoor/outdoor
transmission terminal block (TB3) of outdoor unit.
Check the voltage at TB3 after removing transmission line from TB3.
Check whether the male connector is connected to
the female power supply connector (CN40).
NO
Check voltage of terminal block for centralized control (TB7).
Check voltage of TB7 by removing transmission line from TB7.
Check the voltage between No.1 and No.2 pins of the
CNS2 on the control board.
Check the voltage between No.1 and No.2 pins of the
CN102 on the M-NET board for the transmission line.
Check the voltage between No.1 and No.3 pins of
the noise filter CN4.
Check the voltage between No.1 and No.3 pins of
the noise filter CN5.
Check the noise filter F4 fuse.
Check the voltages among TB22 and TB24 on the
noise filter.
Check the voltage between L2 and N at the power supply
terminal block TB1.
HWE1314A
YES
24 ~ 30 VDC
NO
YES
24 ~ 30 VDC
NO
Connected
YES
YES
DC
24
~
30 V
NO
NO
YES
DC
24
~
30 V
NO
YES
24
~
30 V
DC
NO
YES
24
~
30 V
DC
NO
NO
YES
DC
279
~
374 V
NO
YES
DC
279
~
374 V
NO
YES
F4 blown
NO
YES
198
~
264 VAC
NO
YES
198
~
264 VAC
NO
Check whether the transmission line is disconnected,
check for contact failure, and repair the problem.
Check if the indoor/outdoor transmission line is not
short-circuited, and repair the problem.
Check the wiring between the control board and M-NET board
for the transmission line (CN62, CNPS, CN102 and CNIT),
and check for proper connection of connectors.
YES
Is there a wiring
Fix the wiring and connector
error or a connector
disconnection.
disconnection?
Check for shorted transmission
line or power feed collision for
centralized control.
Replace the control board.
YES
Is there a connector
Fix the connector disconnection.
disconnection?
NO
Check the voltage between No.5 and No.2 pins of
the CNPS on the control board.
YES
Is the voltage
Replace the M-NET board
measurement between
4.5 and 5.2 VDC?
Replace the control board.
Replace the M-NET board
Disconnect the noise filters CN4 and CN5, and then
replace F4, then turn the power on.
YES
F4 blown
Replace the noise filter.
NO
Connect the noise filter CN4, and then turn the power on.
YES
Replace the control board.
F4 blown
NO
Replace the M-NET board
Replace the noise filter.
Replace the noise filter.
Check and fix any power supply wiring and main power
supply problems found.
- 351 -
Turn on the
power again.
GB
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