| 摘要 |
PURPOSE: To suppress abnormal overheating of a refrigerant heater by controlling a gas supply controller based on the temperature difference between temperature sensors disposed on the inlet side and the outlet side. CONSTITUTION: A refrigeration cycle couples the delivery side 1a of a compressor 1 with a refrigerant heater 3 through an indoor heat exchanger 2 and refrigerant temperature sensors 4, 5 are provided on the inlet side 3a and the outlet side 3b of the refrigerant heater 3. The gas supply unit 6 of the heater 3 is provided with a gas supply controller 7 which is controlled based on the temperature difference between temperature sensors 4, 5 disposed on the inlet side and the outlet side of the heater 3. Detection signals from the sensors 4, 5 are delivered to a microcomputer and compares each other. When the differenceΔTS exceeds a preset level, movement of a gas proportion valve of the controller 7 is controlled by a control signal to decrease gas combustion quickly thus suppress abnormal overheating of the refrigerant heater.
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