ZB scroll compressor configuration of the built-in pressure relief valve type compressor discharge temperature protection discharge check valve motor protection ZB15-ZB45IPRTOD there midpoint protector ZB50-ZB88 no ASTP midpoint protector has no built-row ZB92-ZB11M No external air temperature sensor motor protection module + built-in sensor ZB Series Series Application Guide built-pressure relief valve (IPR valve) Built-pressure relief valve is located between the high side and low side of the compressor, the pressure when the high side and low side between turned difference exceeds 26 ~ 32bar. When the built-in pressure relief valve after the open, the exhaust gas heat of contact temperature sensing motor protector parts, motor protection tripped midpoint, when the three-phase motor winding open, the compressor must be sufficiently cooled, the midpoint of the motor protection device will reset. ZB58KQ ~ ZB88KQ and ZB92KC ~ ZB11MC not set the built-in pressure relief valve, in order to ensure safe operation of the system should be configured to a set pressure of not more than 30bar (gauge) of the high pressure switch in any application. The internal temperature protection TOD or ASTP is set in the vortex vent temperature fast acting valve piece. When the exhaust temperature is too high it will open so that the high temperature exhaust gas back and contact motor protection, which protects the compressor. Motor protection module ZB92 and ZB11M motor protection system includes an external motor protection module, which is connected with four embedded motor windings are connected in series and is located inside the scroll chamber fifth thermistor discharge. If the motor temperature or exhaust gas temperature exceeds a set value of any one, the module will trip and held for 30 minutes. (Note: The module power is off, it will reset at once). Module is a 30-minute delay to allow sufficient cooling time vortex. Once again the opportunity to start the temperature rise caused by compression of the scroll compressor internal destructive, absolutely do not do this module power and control circuit together.