FIGURE 6.40 Schematic diagram of heat pump with solid-state defrost contral L1 L2 240 V/10/60 Hz. (Outdoor unit) COMP DT DB1 AVS DB2 R SHR1 SHR2 DB3 ODT BR Legend Contactor COMP Compressor OFM Outdoor fan motor BM DB Defrost board BR Defrost thermostat Reversing valve solenoid Strip heat relay a1 Strip heat relay a2 Blower relay DT RVS SHR1 SHR2 BR SHR1 SHT1 SH1 SHT1 SHT2 Strip heat thermostat 2 SH1 SH2 Strip heat thermostat 1 Strip heater 1 Strip heater 2 Outdoor thermostat Blower motor SHR2 SHT2 SH2 ODT (Indoor unit) BM 240 V/10/60 Hz- L1 12

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