Panasonic R410A Service Manual

Also see for R410A: Installation instructions Service manual Installation instructions Installation instructions

Contents

Panasonic R410A Service Manual Manual pdf 21 page image

Mini VRF SYSTEMControl Functions1 - 15123546•••11-2. Inverter Compressor11-3. CT Circuit Detection Failure12. Pressure Sensor FailureThis system includes a high-pressure sensor.12-1. High-Pressure Sensor FailureConnector disconnection or displacement failure is judged according to the relationship between the high-pressuresensor temperature, which is detected by the high-pressure sensor, and the various temperature thermistors.However, if the pressure rises suddenly, a high-pressure sensor failure warning may be judged before the high-pressure sensor activates. Therefore check the following before determining that a pressure sensor failure hasoccurred:Has the service valve been left open?Is there a blocked circuit?Is there leakage of refrigerant into stopped outdoor units?Also check the difference between the high-pressure as measured by a manifold gauge and the pressure asdetected by the pressure sensor.13. 4-Way Valve Failure [L18]When a 4-way valve coil failure, coil disconnection or similar failure occurs, a judgment is made automatically fromthe operating conditions, and an alarm is output.Alarm DescriptionP16 Occurs when overcurrent (32.5 A) is detected during normaloperation.P26 Occurs under the same conditions as P16, when the invertercompressor is operating at 80 Hz or higher.P29 Occurs when a missing phase or overcurrent (48 A) is detectedwhen the inverter compressor starts.H31 Occurs when the HIC detects overcurrent (75 A), and when anabnormal temperature (302°F) is reached.The inverter current values include primary current and secondary current.Alarm judgment uses both of these current values. However, in general the secondarycurrent is higher than the primary current.Alarm DescriptionH03 Occurs when an open circuit is detected in the invertercompressor CT circuit.Alarm DescriptionF16 High-pressure sensor failureCompressor 1(inverter compressor)If the operating frequency of the inverter compressor is low, the current value is also low.As a result, this alarm is detected only when the compressor is stopped.11. Current Protection 12. Pressure Sensor Failure13. 4-Way Valve Failure [L18]