Chiller troubleshooting

You are looking at a low pressure chiller and the chiller condenser barrel approach temperature has gradually increased to 9 degrees over a time period of 4 months on a 3 pass evaporator the likely cause is?

• The cooling tower fan is not running up to speed.

• The sump on the tower needs cleaning.

• The chiller condenser barrel has built up with contaminants and needs cleaned.

• The condenser water pump is running too slow causing an increased approach.

High pressure chillers utillizing screw compressors require what because of the high refrigerant flow?

• Oil separator

• High pressure safety

• Flow diversion valve

• Electronic expansion valve

Screw compressors control capacity with?

• Suction valve lift

• Suction solenoid valve

• Slide valve

• Inlet vanes

Screw compressors are used on low pressure chillers.

• True

• False

A high pressure chllier locked out on High pressure safety open a likely cause could be?

• Dirty chiller barrel

• Dirty condenser coil

• Low water flow on the evaporator

• Low refrigerant charge

If the fan on the cooling tower fails what is likely to happen to the range of the cooling tower?

• It will increase but the approach will decrease

• It will decrease and the approach will increase

• It will increase and the approach will increase

• It will decrease and the approach will decrease

The flow switch interlock is designed to?

• start the pump on the chiller

• stop the chiller if water flow is not present

• start the chiller when water flow starts

• stop the chiller when water flow starts

If the expansion valve is not feeding enough refrigerant what is likely to happen to the approach temperature?

• The approach temperature will remain constant

• The approach temperature will decrease

• The approach temperature will increase

• The approach temperature will fluctuate

Tags

NGSS.HS-PS3-4

If a high pressure chiller has a low water temperature alert what would you check?

• The operation of the condenser fans

• The operation of the chilled water pump

• The control set point

• the condition of the condenser coils

If a high pressure chiller is running high chilled water approach and high superheat what could be the cause?

• Low refrigerant charge

• expansion valve fault

• Clogged liquid line refrigerant filter

• All the above