Front

Most commercial refrigeration evaporators are _____ evaporators.

Back

forced-draft

Front

The three variables by which defrost timers operate include all of the following, except _____: humidity, pressure, temperature, time.

Back

humidity

Front

Excess moisture produced by a defrosting evaporator may be removed from a conditioned space or cabinet using a _____ when the available drain is elevated or at a remote location.

Back

condensate pump

Front

Evaporator defrosting that involves pumping refrigerant directly from the compressor discharge line into the evaporator tubing describes a(n) _____ defrost.

Back

hot-gas

Front

Evaporator defrosting that involves circulating a heated solution in tubing near and around the evaporator during the Off cycle describes a _____ defrost.

Back

nonfreezing solution

Front

Evaporator defrosting that involves running tap water over the evaporator when the refrigeration system is off describes a(n) _____ defrost.

Back

water

Front

An evaporator defrosting system that circulates air from the conditioned space over the evaporator during the Off cycle is a(n) _____ defrost.

Back

off-cycle

Front

For _____ defrost, refrigerant is removed from the evaporator to increase heat transfer to ice and frost buildup.

Back

pump-down

Front

Which of the following statements about air-cooled condensers is not true? Short cycling must be designed into air-cooled condensers. The condensing unit must be weatherproof. Head pressure control is needed if the unit is outdoors.

Back

A method of diluting compressor oil with refrigerant must be designed into air-cooled condensers.

Front

The primary need for head pressure control in commercial refrigeration systems is due to _____: high winds, low ambient temperature, rain, refrigerant overcharge.

Back

low ambient temperature