ch 55

Which of the following statements regarding water-cooled condenser service is false? 1

Increased head pressure is often a sign that the water flow rate is too high.

Which of the following statements regarding hermetic compressor removal is false?

After power has been locked into the closed position, the technician should label and disconnect the compressor wires.

Which of the following statements regarding water-cooled condensers is true?

All of the above. A water-cooled condenser should be cleaned at least annually, depending on its usage. Scale accumulation in the water tubes reduces heat transfer from the refrigerant to the water. Water softeners and additional filters should be used with well water to remove minerals.

When using the system's compressor to add oil to a refrigeration system, ____

None of the above.

Which of the following statements regarding cooling tower service is false?

None of the above.

Which of the following statements regarding open-drive compressor removal is false?

None of the above.

Which of the following statements regarding recovered refrigerant is true?

Recovered refrigerant may be stored temporarily if facilities are available for distilling it. Some larger companies save recovered refrigerant, redistill it, and process it for further use. Refrigerant that is to be returned to a system may be temporarily stored. Correct! All of the above.

Which of the following statements regarding water-cooled condensers is false? 3

Repairing a water-cooled condenser is usually less expensive and more reliable than replacing it.

Which of the following statements regarding water-cooled condenser removal is false? 2

Water from the water circuit should be circulated through the refrigerant loop to flush out any impurities.

To isolate the largest possible amount of the refrigerant circuit from the refrigerant charge at the end of a pump down, close the valve between the ____ and liquid receiver.

condenser

When recovering refrigerant into a cylinder using an open-drive compressor, ____.

do not open any part of the refrigerant circuit until the pressure in the system is raised to atmospheric pressure

A burned out hermetic compressor may be reconditioned by flushing it with nitrogen.

false

A water valve with rubber or plastic seals that is leaking and not operating properly should be disassembled, worked with sandpaper or emery cloth, reassembled, and placed back into service.

false

Dust, dirt, and grease accumulations on a motor should be cleaned with an acid wash.

false

If a pressure-operated water valve is used with a water-cooled condenser, it should always be removed before the condenser is removed.

false

When dismantling part of a commercial system's refrigerant circuit, the release of refrigerant into the atmosphere can be minimized by pumping down the refrigerant charge into the ____.

liquid receiver

When a sight glass and moisture indicator are installed between the filter-drier and the refrigerant metering device, the ____.

moisture indicator will show a rising level of moisture once the filter-drier is full filter-drier will absorb moisture before it reaches the moisture indicator sight glass will indicate possible unintentional pressure drops along the liquid line Correct! All of the above.

When pumping down a refrigerant charge, it is important to ____.

properly adjust the service valves for the pump down process Correct! All of the above. monitor gauge manifold readings run the compressor to perform the pump down process

After adding oil to a refrigeration system using the compressor, ____.

run the system for a couple of minutes and listen for noises Correct! All of the above. more oil should be added if the system is making noises stop compressor operation if chugging sounds are heard

During refrigeration system reassembly, filter-driers should be installed ____.

to capture any matter that may have entered the system

A low pressure is needed to evaporate and remove refrigerant from any part of a system being dismantled for service.

true

A pressure-operated water valve should also be tested for leaks while it is being adjusted using a portable air cylinder.

true

Any electrical connections that are removed when preparing an air-cooled condenser for removal should be marked with tape, a marker, or wire tags.

true

Before removing a water-cooled condenser, the water drain valve should be opened.

true

During refrigerant recovery, one method of avoiding high head pressure is by running the compressor intermittently.

true

Glass containers are used when adding oil to a system in order to observe how much oil has been added.

true

When servicing a system with a burned out motor in its hermetic compressor, ____.

use a refrigerant recovery machine to triple evacuate the system to 500 microns

Inadequate water flow in a water-cooled condenser ____.

will not remove as much heat as it should