Check Connection; Check Winding Resistance; Check Cause Of Protector Operation - Fujitsu Airstage V-II Service Manual

SERVICE PARTS INFORMATION 2
Constant Speed Compressor
Check Point 1 : Check Connection
Check terminal connection of Compressor (loose or incorrect wiring)
Terminal cover opened
U (R)
(RED)
Check Point 2 : Check Winding Resistance
Check winding resistance of each terminal
If the resistance value is 0
(Check again after several minutes because the protector may be
operated.)
W (C)
V (S)
Internal Protector
Check Point 3 : Check Cause of Protector Operation
Due to unstable power supply, Compressor is causing an abnormall
>> Check Power Voltage once again.
Due to missing phase, Compressor is causing an abnormally high t
>> Check loose or open connection cable once again.
Due to less refrigerant, the cooling effect inside Compressor is
>> Check if there is a gas leak or less refrigerant.
W (C)
(BLACK)
V (S)
(WHITE)
or infinite, replace Compressor.
1.884
Resistance
Value
1.835
1.865
U (R)
Check connection of magnet relay (Loose or incorrect wiring)
Magnetic relay
Attention!!
The constant speed compressor is equipped with a
protector. It detects the inside temperature and the
current value, and if it detects an over current or too
high temperature, the protector is operated to stop
operation of Compressor. (Protector operates within
the range in the following graph, and it is released
when the temperature becomes lower than approx.
80°C.
(25°C)
40
30
20
10
0
50 60 70 80
y high temperature.
emperature.
decreased.
04-99
terminal
BLACK
RED
WHITE
R S T
U V W
RED
WHITE BLACK
compressor
Protector operation range
90 100 110 120 130 140 150 160 170
Temperature [°C]