To improve reliability of a high pressure rise preventing means of an existing connecting piping and to improve versatility to enable use in both cooling operation and heating operation, in regard to an engine drive type heat pump in transferring to HFC refrigerant.
This engine drive type heat pump 1 having a compressor 10 by driving of an engine, a receiver 14 for storing a liquid refrigerant, and a four-way valve 20 capable of connecting a discharge path with an outdoor heat exchanger or an indoor heat exchanger, further comprises a bypass path 66 provided with a bypass solenoid valve 32 on the way, connected with the discharge path 60 at its one end, and connected with a suction path 61 at the other end, a first pressure switch 97 disposed on a path connecting the four-way valve 20 and the indoor heat exchanger 13, a second pressure switch 96 disposed on a path connecting the receiver and the indoor heat exchanger, and a high pressure rise preventing means opening the bypass solenoid valve 32 when the first pressure switch 97 or the second pressure switch 96 becomes more than a prescribed value.
MASUDA TAKAHIKO
SAWADA HIROSHI
SHINOMIYA MASAFUMI
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