Checking And Repairing Of Electric Parts - Carrier 42HWG009 Technical Data & Service Manual

9

CHECKING AND REPAIRING OF ELECTRIC PARTS

Operating Procedure
1) Measuring insulation resistance of indoor fan
motor
Remove the fan motor connector from PCB.
a
b Connect clip to the ground terminal
connecting Green/Yellow line.
c M e a s u r e i n s u l a t i o n r e s i s t a n c e b y c o n n e c t i n g
terminal of insulation ohmmeter to the arbitrary
fan motor connector. (Refer to fig. 1)
d It is normal that insualtion resistance is over
1MΩ.
2) Checking the winding of compressor motor
a. After removing terminal cover of compressor
motor, set the range of resistance measurement
of multimeter to "x1Ω".
b. Among the terminals, check the disconnection
between two terminals (C
in fig. 2.
c . C h e c k t h e d i s c o n n e c t i o n b e t w e e n t w o t e r m i n a l s
(1 3) of Overload-protector of compressor motor.
d. It is normal if there is no disconnections.
3) Checking PCB for control by operating voltage
of fan motor
a. Remove the connector between PCB and fan
m o t o r .
b. Assure that other parts are not short before
supplying power to the unit.
c. Operate the unit and change fan speed by remote
controller.
d. It is normal that the voltage between the
connector pin (CN3,
over (line voltage - 50VAC). But, this test has to be
done within 1 minute.
R, C S)as shown
) is measured as
55
Photos
Green/Yellow
Ground terminal
F i g . 1
S
C
R
1
3
OLP
Compressor terminal
F i g . 2
Multimeter