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

A charged low pressure refrigeration system can be efficiently leak-checked by

The existence of air in a low pressure system causes

Which safety precaution should be adhered to for low pressure systems?

Refrigerant-11 (R-11) at 14.7 psia, will boil at about

When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system, this indicates that

ASHRAE Standard 15-1994 requires equipment room refrigerant sensors for what safety group classification?

When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells before charging with liquid?

After reaching the required recovery vacuum on a chiller, you should

A hydrostatic tube test kit is used to

When charging a chiller, refrigerant vapor is introduced into the system before charging with liquid refrigerant. This is because

When evacuating a system, the use of too large a vacuum pump can cause

On a low pressure chiller with an open-type compressor, the _________ is/are very susceptible to leaks.

What steps may be taken to prevent air accumulation into an idle low-pressure refrigeration system?

Commercial and industrial process refrigeration systems must be repaired when the leak rate exceeds ______ percent of the charge per year.

When recovering vapor from a low pressure refrigeration system,

Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system?

The purge unit takes its suction from the

Which of the following repairs would ALWAYS be considered a “major” repair unde EPA’s regulations?

Charging liquid refrigerant into a refrigeration system when it is under a 29-inch Hg vacuum can cause the

According to the EPA there is approximately ________ of refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed.

An oil sample should be taken when

Both CFC-11 and HCFC-123 chillers require purge units because

Refrigerant recovery typically starts with __________ because it is faster.

Under EPA regulations, _________ is used to pressurize a low-pressure chiller for the purpose of opening the system for a non-major repair.