What precaution should be taken prior to recovering from a chiller suspected of having tube leaks?

What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?A. Leak test and repair the chiller.B. Seal the purge unit discharge line.C. Pipe purge unit back into the low side.

D. Pipe purge unit back into recovery unit.

A. Leak test and repair the chiller.

Leak testing a low pressure refrigeration system with nitrogen in excess of 10 psig could cause which of the following to fail?A: CONDENSER TUBES. B: PURGE UNIT SHELLS. C: EVAPORATOR

D: Rupture Disc

What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks

A. Drain the water sides of the evaporator and condenser

Industrial process refrigeration when the leak rate exceeds

What must a system owner do once the threshold leak rate has been exceeded on any low pressure system using an ozone depleting refrigerant?

D: Repair the applicance enough to bring the leak rate below the threshold, retrofit, or retire the applican

passed the initial verification leak test, when must a follow-up verification test be conducted

A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is

Refrigenant removal from a low-pressure system starts with

Why should the oil be removed from a low-pressure system at 103'F

B: Less refrigenant will be contained in the oil at the higher temperature

A rupture disc on a recovery vessel for low-pressure refrigeants relieves at

What is the result of raising the tempurature of the room in which a low-pressure chiller is located?

B: Faster refrigerant recovery

What is a typical advantage of a water cooled recovery unit?

Faster recovery of large quantities of refrigerant

Charging liquid R-245fa into a low-pressure refrigeration system under a vacuum greater than 18 inches. Hg vacuum can cause the

C: System water to freeze

Which of the following statements is true for recycling and recovery equipment?

It must be equiped with low-loss ball valves and flare fittings

to pressurized an R-1233zd system for the purpose of opening the system for a non-major repair?

Warming the liquid refrigerant in the system

What evacuation level must technicians recover refrigerant to before disposing a low-pressure applicane?

These system operate below atmospheric pressure

reason to take oil sample

the unit has had a compressor burnout

prevent freezing by increasing pressure using a gas such as

Pressure relief valves must NOT be installed

which of the following statements about R-1233zd is FALSE

It is SNAP approved replacement for low-pressure centrifugal systems

Continuous excessive moisture collection in the purge unit of a low-pressure refrigeration system could indicate what condition?

The condenser or the chiller barrel tubes are leaking

ASHRAE Guideline 3, check for leak

Chillers belong to which EPA leak repair category

After recovering liquid refrigerant

Recover the vapor refrigerant

What should be on/off during vapor removal from a chiller?

Water pumps, recovery compressor, recovery condenser warer should all be on

How do you determine when enough vapor has entered the refrigeration system before you charge refrigerant liqid

Refrigerant saturation temperature increases above 32'F

Replacement of Evaporator coil / Compressor /

R-123 at 14.7 PSIA will boil at

safety precautions should be adhered to for low-pressure systems

Use glove and safety goggles when working with liquid refrigerant

where should the discharge from a rupture disc be piped for venting

burst pressure for a rupture disc

Place a leak detector probe to check gas leaks into the water box with water removed

In the drain valve opening

Which of the following CANNOT be used as a reason to extend the applicance leak repair deadline

Necessary repair parts are unavailable

The use of severly oversized vacuum pump could

Cause trapped water to freeze

lowest access point on a low-pressure centrifugal air-conditioning appliance

Evaporator charging valve

indicates air in a low-pressure system

refrigerant go after it leave the purse unit of a low-pressure centrifugal system

AHREA Standard 15-2013 requires the use of sensors and alarms to detect

All refrigerant safety groups

Excessive running of a purse unit

replacement appliance used a refrigerant exempt from the venting prohibition

where is refrigerant added to a centrifugal machine

Evaporator charging valve

activate an alarm and mechanical ventilation

when the TLV-TWA Threshold Limit Value - Time Weighted Average is exceeded