It is important not to exceed ______ when the leak testing a low pressure system because the rupture disc, located on the evaporator, might fail:

Once certified, EPA Section 608 certification has ______ expiration date.

5-ton is ______ BTU/hour

Whenever you evacuate a system to sub-ambient pressures, always break the vacuum with _______ before opening the system to the air

Only self-contained recovery devices can be used with ______ systems

Which of the following has higher initial cost and increased maintenance costs:

In which of the following system, a separate receiver is not necessary

Liquid receiver is located typically just after the condenser and before the expansion device

If you plan on reusing it in the system (either recycled or simply recovered and replaced), it should be tested for purity with an _____ purity test

The ARI-certified, tested refrigerant-to-air-emission ratio should be below _____ of refrigerant per pound of air purged