Heat Pump ESCO Questions with Verified Answers

An air-to-air heat pump has many of the same components as an air conditioning system. The major difference is that a heat pump also has an - Reversing valve A customer complains that their heat pump systems blows cool air periodically during the heat mode. This could be caused by; - A faulty defrost relay (does not energized the aux. Heat during the defrost mode.) When a heat pump is in the heating mode, which can cause frost accumulation on the outdoor coil when the ambient temperature is 45*F? - The outdoor coil is colder than the ambient air. The indoor fan on a heat pump system operates; - At the same speed for heating or cooling; The defrost cycle can be initiated by; - Time and temperature. The defrost cycle can be terminated by; - Time/temperature Movement of the piston in the reversing valve is accomplished by; - Bleeding pressure from one side of the piston to the suction side of the compressor. Some close coupled (package unit) heat pumps use an electronic expansion valve is; - Electronic expansion valves can meter refrigerant in either direction. Liquid line filter-driers that are used on heat pump system; - Must be a bi-flow design if used without check valves. When installing the heat pump outdoor unit, care should be taken to provide for drainage during the ________ cycle. - Defrost. The indoor coil is usually mounted in the air stream _______ the auxiliary electric heat strips. - Before. On Dual Fuel Systems, the indoor coil must be located; - After the heat exchanger. Air-to-air heat pumps are most practical to operate in areas where the lowest winter temperature does not go below ______ *F - +10 Air-to-air heat pumps, operating without auxiliary heat, provide air to the registers that is approximately _______ *F or less. - 100