ACR-106 Unit 49 Operation, Maintenance, Troubleshooting

The first step in starting a chilled-water system is to ____.

• activate the compressor unloading system

• establish the chilled-water flow

• activate the condenser heat removal system

• start the compressor operation sequence

There should be a ____ test point at the inlet and outlet of any water heat exchanger, chiller, or condenser.

• temperature

• pressure

• vapor

• moisture

When a water-cooled chiller is operating normally, it can usually be left unattended, except for which component?

• The condenser.

• The evaporator.

• The metering device.

• The cooling tower.

Reciprocating chillers have crankcase heaters to ____.

• preheat the chilled water for better efficiency

• prevent refrigerant migration to the crankcase

• preheat the compressor bearings for longer wear

• minimize condenser subcooling

Chillers manufactured in the last few years all have ____ controls.

• electronic

• hydraulic

• pneumatic

• pressure-based

Water-cooled chillers must have water treatment to ____.

• increase the pH content of the water in the sump

• decrease the pH content of the water in the sump

• prevent minerals and algae from forming in the water circuit

• help preheat the water in the condenser water circuit

Centrifugal chillers range in size from ____ tons for a single chiller.

• 10 to 50

• 10 to 80

• 50 to 500

• 100 to 10,000

A typical chilled water system is designed to operate with a leaving water temperature of ____°F.

• 35

• 40

• 45

• 50

What may happen if a lithium-bromide absorption system is started with the cooling water too cold?

• High head pressure in the system.

• Low head pressure in the absorber.

• Removal of system load, compressor cylinders will unload.

• Crystallization occurs.

The operation of chillers involves starting, running, and stopping the system’s components in an orderly manner.

• True

• False