Acson international A4AC100C, Technical Manual

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11. TROUBLESHOOTING
When any malfunction is occurred, immediately switch off the power supply to the unit, and contact the
local dealer, if necessary. Some simple troubleshooting tips are given below:
Phase Proctector (Optional)
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device
(phase proctector) is fitted to prevent incorrect wiring of the electrical phases. When the three phases
are not connected correctly, the phase protector operates, and the unit will not start. This devise is located
in the control box of model AMAC/ A4AC80~150C/CR.
The following tables shows the LED indicator light for phase proctector under normal operation and fault
coonditions.
Notes: 1. “+” indicates additional for PP01 phase proctector.
2. When R phase missing. no LED or buzzer will indicate the error, but relay 71 and 81 will cut off.
LED PW P_R P_S P_T
Description (Red) (Yellow) (Yellow) (Yellow)
Normal operation
○ ● ● ●
-
Reverse phase
◑ ◑ ◑ ◑
Swith off the unit. Check the 3 phase wiring.
T phase missing
◑
● ●
◑
Swith off the unit. Check the 3 phase wiring.
S phase missing
◑
●
◑
●
Swith off the unit. Check the 3 phase wiring.
R phase missing
● ● ● ●
Swith off the unit. Check the 3 phase wiring.
S & T phase missing
+
◑
●
◑ ◑
Swith off the unit. Check the 3 phase wiring.
Overload
+
◑
● ● ●
High discharge temperature. Check the refrigerant system.
Sensor missing
+
◑
○ ○ ○
Swtich off the unit. Plug in sensor.
Actions
○
On
●
Off
◑
Fast Blink
SYMPTONS PROBLEM CAUSES REMEDIAL ACTION
1. Compressor does
not start.
•
No power supply.
• Fuses blown or automatic circuit
break down open.
•
Defective contactor or coil.
• Unit is stopped because safety
device has tripped.
•
Loose wires.
• Compressor faulty.
•
Check power supply.
• Look for short circuit or grounded
wires in motor windings. Replace
fuses and reset circuit breakers
when the fault has been corrected.
Check tightness and soundness of
all electrical connections.
•
Repair or replace.
• Determine the type of safety shut
down and correct the default before
the unit is restarted.
• Check wire connections and
tighten terminal screws.
•
Contact local dealer.
2. Fan does not work. • No power supply.
•
Fan motor faulty.
• Check power supply.
•
Contact local dealer
3. Unit does work, but
insufficient cooling.
• Thermostats setting too high.
•
Condenser coil dirty.
• Obstacle blocking air inlet or
outlet of the unit.
•
Insufficient refrigerant in the
system.
• Improper water flow rate,
•
Water in the system is
contaminated.
• Reset thermostat.
•
Contact local dealer.
•
Remove obstacles.
•
Contact local dealer.
• Contact local dealer.
•
Contact local dealer.
4. Flow switch error. •
No water in the system.
• Low water level in the system.
• Phase missing or phase reversed
•
Check water supply.
• Check water supply.
• Check phase protector