McQuay M4AC 080 C, Руководство пользователя

Страница: 64 / 68

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 Protector (Optional)
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device
(phase protector) 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 the outdoor unit.
LED
Description
PW
(Red)
P_R
(Yellow)
P_S
(Yellow)
P_T
(Yellow)
Actions
Normal operation -
Reverse phase Switch off the unit. Check the 3 phase wiring.
T phase missing Switch off the unit. Check the 3 phase wiring.
S phase missing Switch off the unit. Check the 3 phase wiring.
R phase missing Switch off the unit. Check the 3 phase wiring.
S &T phase missing
+
Switch off the unit. Check the 3 phase wiring.
Overload
+
High discharge temperature. Check the refrigerant system.
Sensor missing
+
Switch off the unit. Plug in sensor.
The following table shows the LED indicator liuht for phase protector under normal operation and fault conditions.
SYMPTOMS POSSIBLE CAUSES REMEDIAL ACTION
1. Compressor
does not start.
x
No power supply.
x
Fuses blown or automatic circuit break-
down open.
x
Defective contactor or coil.
x
Unit is stopped because safety device
has tripped.
x
Loose wires.
x
Compressor faulty
x
Check power supply.
x
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.
x
Repair or replace.
x
Determine the type of safety shutdown
and correct the default before the unit is
restarted.
x
Check wire connections and tighten
terminal screws.
x
Contact local dealer.
2. Fan does not
work
x
No power supply.
x
Fan motor faulty.
x
Check power supply.
x
Contact local dealer.
3. Unit does work,
but insufficient
cooling.
x
Thermostat setting too high.
x
Condenser coil dirty.
x
Obstacle blocking air inlet or outlet of
the unit.
x
Insufficient refrigerant in the system.
x
Improper water flow rate.
x
Water in the system is contaminated.
x
Reset thermostat.
x
Contact local dealer.
x
Remove the obstacle.
x
Contact local dealer.
x
Contact local dealer.
x
Contact local dealer.
On Off Fast Blink
Notes: 1. “+” indicates additional functions for PP01 phase protector.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 and 81 will out off.
63