Service manual

54
MUZ-A09/12/15/17 MUY-A15/17
K Check of current-limiting resistor
MUZ-A24 MUY-A24 MUZ-GA24 MUY-GA24
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
Replace the power P.C.
board or the inverter P.C.
board.
Does LED on the
inverter P.C. board
light up?
Does the rush current
limiting relay (X64) work
properly? (Normally it
closes 1 second after
outdoor unit power ON.)
Is the resistance of current-
limiting resistor (R64A or
R64B) on the power P.C.
board normal?
(Normal resistance: 5 Ω ±5%)
No
Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.
Yes
Turn ON the power
supply and press
EMERGENCY
OPERATION switch.
Replace the inverter P.C.
board or the compressor.
Replace the power P.C. board.
Replace the power P.C. board.
Yes
Yes
No
No
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
Replace the noise fi lter
P.C. board or the outdoor
electronic control P.C.
board.
Does LED on the
outdoor electronic
P.C. board light up?
Does the rush current
limiting relay (X64) work
properly? (Normally it
closes 1 second after
outdoor unit power ON.)
Is the resistance of current-
limiting resistor (R64A or
R64B) on the noise fi lter P.C.
board normal?
(Normal resistance: 5 Ω ±5%)
No
● Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.
Yes
Turn ON the power
supply and press
EMERGENCY
OPERATION switch.
Replace the outdoor
electronic control P.C.
board or power P.C.
board or the compressor.
Replace the noise fi lter P.C.
board.
Replace the noise fi lter P.C. board.
Yes
Yes
No
No