Lennox LNINVE052 Service Manual page 70

Service Manual
6.Capacity charging malfunction (outdoor unit malfunction) (AP1 below means control board of outdoor unit)
Main detection points:
● Detect if the voltage of L and N terminal of XT wiring board is between 210VAC-240VAC by alternating voltage meter;
● Is reactor (L) well connected? Is connection wire loosened or pulled out? Is reactor (L) damaged?
Shut down the power and wait 20
minutes; or use DC voltmeter to
measure the voltage on the two
ends of electrolytic capacitor
until the voltage is lower than 20V
Installation and Maintenance
Turn on the unit and
wait 1 minute
Use AC voltmeter to measure
the voltage on the two ends
of electrolytic capacitor
(see fig 30)
Voltage higher
Y
than 200V?
N
Measure the voltage
input with AC voltmeter
(see fig 30)
Voltage within
N
180VAC~260VAC?
Y
Check the connection
of reactor and connection
wire
If the wiring of
N
reactor L is normal?
Y
Replace outdoor
mainboard AP1
End
Malfunction of
Replace outdoor
the outdoor
mainboard
mainboard AP1
Power supply is
abnormal; repair
the power supply
Power on and
to restore the range
restart the unit
between 180VAC
~260VAC
Connect the
connection Power on and
wire of reactor restart the unit
L correctly
N
Is the Vmalfunction
eliminated?
N
Is the Vmalfunction
eliminated?
Y
Y
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