EPA 608 Type 2 High Pressure National Trademan

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

oil

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

change filter and compressor oil if any.

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

local municipal water supply

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.

4 inches of Hg vacuum

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

30 F

R-410a requires recovery tanks rated for at least

400 psig

The recovery rate can be increased by

packing the recovery vessel in ice.

Oil foaming usually occurs in the

compressor

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

can probably be charged back into the system

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

-15 F

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

30%

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

R-22

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

excessive superheat

System-dependent recovery equipment CANNOT be used when

the appliance contains over 15 pounds of refrigerant.

When a refrigerant trace gas becomes absolutely necessary to use, which of the available refrigerants should be used to identify a leak?

HCFC-22

After refrigerant liquid has been recovered from a system, any remaining vapor is

condensed by the recovery system.

The backseating of a suction shut-off valve will close the

gauge port

R-410a requires certified recovery and recycling equipment rated for at least

400psig

A compressor heater is used to

reduce the amount of refrigerant in the lubricating oil

Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled?

Recover as much of the R-502 as possible from the recovery machine, change the filter, and evacuate

A deep vacuum is usually measured in

microns

To recover liquid refrigerant, you must connect one hose to the

liquid line

The refrigerant pressure inside an R-12 unit which is at room temperature (72F) and not operating is

approximately 74 psig