Daikin GYEQ20AN, Руководство по обслуживанию

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SiAUY361411EA Inspecting the Outdoor Unit
Parts Inspection 176
1.5 Inspecting the Ignition System
„
Output voltage
∗
This should be tested approximately 10 minutes after stopping (because the voltage
immediately after stopping will be the same as while running).
1. Using a tester, check if the output voltage requirements specified above are met.
2. If the voltage is significantly different than specified above, stop the system using the
onboard checker and wait for 5 minutes; then, with the power OFF, check the harness for
continuity and the junction connectors for contact failure using a tester.
3. If the harnesses and connectors are OK, then check each component.
„
Inspecting the ignition timing
• With the engine running, clip the plug cord of cylinder No.1 with the timing light clip. The timing
light will begin flashing. Point the flashing light to the flywheel circumference and you will be
able to determine the ignition timing of cylinder No.1 based on the position where the flywheel
tick mark comes to rest.
• Check the ignition timing of other cylinders by repeating this procedure.
[If the ignition timing significantly differs:]
• Check the crank pulse sensor and cam pulse sensor for any gap; the harnesses and
connectors for contact failure; and the signal lines for any noise due to their overlap with the
power supply lines.
• Make sure that the main CPU is correct for the current model.
[If the timing light fails to flash:]
If no problems are found after checking the above, replace the main circuit board and/or power
supply circuit board.
Parts to inspect Measuring points
During
system
stop
∗
While system is running
(with actuator check
CH1 ON)
Ignition
power
supply
Primary side
Between starter transformer's
input terminals
0 V 200 V AC
Secondary
side
Between main circuit board's
CN20-5 and -6
0 V 14 V DC
Between power supply circuit
board's CN105-1 and -3
0 V 14 V AC
Between power supply circuit
board's CN107-1 and -2
0 V 14 V DC
Clip the ignition coil plug
cord.
Point the timing light to
the flywheel circumference.
025944-00E
TDC
bTDC10°
bTDC40°
1