A routine maintenance task which must be performed on refrigerant recycling machines is to

Refrigerant should be removed from the condenser outlet if the

When evacuating a system, the use of a large vacuum pump could

On refrigeration units that use an open compressor, the ________ is most likely to leak if the unit is not used for several months.

The primary water source most often used for cooling the condenser of a water-cooled recovery unit is

When using recovery and recycling equipment manufactured BEFORE November 15 1993, technicians must evacuate a unit that has a normal charge of 10 pounds of CFC-500 to _______ before disposing of the system.

The evaporation temperature of R-410a at 100 psig is about

Noncondensables in a system cause a

When charging an R-410a system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _______ before switching to liquid charging.

R-410a requires recovery tanks rated for at least

The recovery rate can be increased by

Oil foaming usually occurs in the

During the evacuation of a system that contains large amounts of moisture, it may be necessary to increase pressure in the system with _______ to counteract freezing of the moisture.

Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable cylinder. The refrigerant

The evaporation temperature of R-134a at 0 psig is

When servicing a 60-ton packaged rooftop unit, the easiest way to check the type of refrigerant it uses is to

EPA regulations require that any appliances containing more than 50 pounds of refrigerant , except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds ________ of the charge per year.

EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak-rate exceeds ________ of the charge per year.

You are going to service an older residential split-system air conditioner. You would expect to find the system charged with which refrigerant?

For what refrigerant is an equipment room refrigerant monitor required under ASHRAE Standard 15?

Heat pumps that use R-134a should be leak-checked with

On a high-pressure system, ________ is an indicator of a possible leak.

System-dependent recovery equipment CANNOT be used when

Moisture is removed from a system by

Which component is not part of the low side of a system?

Soap bubble testing is used

Refrigerant leaves the receiver of a system as a

The recovery of refrigerant from a system as a vapor only will minimize the loss of

A very-high pressure appliance is one that uses a refrigerant with a liquid phase saturation pressure above 355 psia at 104F. This definition includes but is not limited to appliances using which of the refrigerants listed below?