McQuay MAC Especificaciones descargar pdf (Pagina 165)

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 MAC/ M4AC080~150C/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.

163

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.

4. Flow switch error.

• No water in the system.

• Low water level in the system.

• Check water supply.

LED PW P_R P_S P_T

Description (Red) (Yellow) (Yellow) (Yellow)

Normal operation

○●●●

Reverse phase

◑◑◑◑