Daikin McQuay AWS210BDS, Руководство по установке, Страница: 213 / 216

IM 1167 213
Troubleshooting Chart
Troubleshooting Chart
Table 123: Troubleshooting Chart
PROBLEM POSSIBLE CAUSES POSSIBLE CORRECTIVE STEPS
Compressor will
not run.
1.
Main power switch open.
2.
Unit system switch open.
3.
Circuit switch in pumpdown position.
4.
Chilled water flow switch not closed.
5.
Circuit breakers open.
6.
Fuse blown or circuit breakers tripped.


7.
Compressor overload tripped.

8.
Defective compressor contactor or contactor coil.
9.
System shut down by protection devices.

10.
No cooling required.
11.
Motor electrical trouble.
12.
Loose wiring.

13.
Cycle timer active
1.
Close switch.
2.
Check unit status on MicroTech III display. Close switch.
3.
Check circuit status on MicroTech III display. Close switch. Check
pump operation for flow.
4.
Check unit status on MicroTech display. Check Chilled water pump.
5.
Close circuit breakers.
6.
Check electrical circuits and motor windings for shorts or grounds.
Investigate for possible overloading. Check for loose or corroded
connections. Reset breakers or replace fuses after fault is
corrected.
7.
Overloads are manual reset. Reset overload at button on overload.
Clear alarm on Microtech III display.
8.
Check wiring. Repair or replace contactor.
9.
Determine type and cause of shutdown and correct problem before
attempting to restart.
10.
Check control settings. Wait until unit calls for cooling.
11.
See 6,7,8 above.
12.
Check circuits for voltage at required points. Tighten all power wiring
terminals.
13.
Check timer operation
Compressor Noisy
or Vibrating
1.
Compressor Internal problem.
2.
Oil injection not adequate.

3.
Liquid slugging
1.
Contact McQuayService.
2.
Check that oil sight glass has oil visible during steady operation
Check pressure drop across oil filter and oil separator sight glasses
3.
Check suction and discharge superheat
Compressor
Overload Tripped
or Circuit Breaker
Trip or Fuses
Blown
1.
Low voltage during high load condition.
2.
Loose power wiring.
3.
Power line fault causing unbalanced voltage.
4.
Defective or grounded wiring in the motor.
5.
High discharge pressure.
1.
Check supply voltage for excessive voltage drop.
2.
Check and tighten all connections.
3.
Check supply voltage.
4.
Check motor and replace if defective.
5.
See corrective steps for high discharge pressure.
Compressor Will
Not Load or
Unload 1.
Defective capacity control solenoids.
2.
Unloader mechanism defective.
1.
Check solenoids for proper operation. See capacity control section.
2.
Contact McQuayService .
High Discharge
Pressure
1.
Noncondensables in the system.
2.
Fans not running.
3.
Fan control out of adjustment.

4.
System overcharged with refrigerant.

5.
Dirty condenser coil.
6.
Air recirculation from fan outlet into unit coils.
7.
Air restriction into unit.
1.
Remove noncondensables from the condenser coil after shutdown
per EPA regulations.
2.
Check fan fuses and electrical circuits.
3.
Check that fan setup in the controller matches unit fan number.
Check Microtech III condenser pressure sensor for proper operation.
4.
Check discharge superheat and condenser subcooling. Remove the
excess charge.
5.
Clean the condenser coil.
6.
Remove the cause of recirculation.
7.
Remove obstructions near unit.
Low Discharge
Pressure
1.
Wind effect or a low ambient temperature.
2.
Condenser fan control not correct.

3.
Low suction pressure.
4.
Compressor operating unloaded.
5.
Compressor problem, not pumping properly
1.
Protect unit against excessive wind into vertical coils.
2.
Check that fan setup in the Microtech III controller matches unit fan
number. Check VFD fan on units with VFD option.
3.
See corrective steps for low suction pressure.
4.
See corrective steps for failure to load.
5.
Repair or replace compressor