The EPA requires that all comfort cooling systems with more than 50lb of refrigerant be repaired when the annual leak rate exceeds ______ :

The easiest way to leak test a low pressure system is to add warm water over the coil to raise the pressure to _______:

When a electronic leak detector is used to test a water box for leaks, test at the drain valve after the water has been removed:

A purge unit is used on high pressure chillers to remove the non condensables from the system:

To prevent a _____ pressure system from freezing during evacuation, water is commonly run through the chiller tubes:

Absorption chillers have a _______ Coefficient of Performance in cooling (COPc)

When the refrigerant flow is substantially reduced once the system is evacuated, the motor could:

Open-drive compressors are typically ______ compressors

If a liquid receiver is used, it is located downstream of the ______

The air ducts are smaller and less expensive to install compared to water lines leading to each section of the building or refrigerant lines to individual sections