HEAT PUMP TYPE WATER HEATER

摘要

PROBLEM TO BE SOLVED: To raise endurance of a compressor by preventing high/low pressure difference from becoming too large in a low outdoor temperature region in a heat pump type water heater using outdoor air as a heat source. SOLUTION: In a low outdoor temperature region, the opening of a motor- operated expansion valve is controlled so as to lower a high pressure side pressure according to decrease in the outdoor temperature. The rotational speed of the inverter single stage compressor may be controlled so as to keep the compressor capacity constant.