McQuay 5ACV 30 CR, Installation Manual

Page: 24 / 100

1-7
1. Compressor does
not start.
2. Fan does not work.
3. Unit does work,
but insufficient
cooling.
4. Flow Switch Error
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:
SYMPTOMS POSSIBLE CAUSES REMEDIAL ACTION
• 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.
• No power supply.
• Fan motor faulty.
• Thermostat 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.
• No water in the system.
• Low water level in the system.
• 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.
• Check power supply.
• Contact local dealer.
• Reset thermostat.
• Contact local dealer.
• Remove the obstacle.
• Contact local dealer.
• Contact local dealer.
• Contact local dealer.
• Check water supply.
• Check water supply.
! !
! !
!
CAUTION
• Troubleshooting must be performed by qualified personnel.
ISOLATOR FIELD INSTALLATION
The isolator does not come as standard item in the chiller units. It is field installed indoor. To install an isolator, wire it to the
terminal block. See Figure 14.