Panasonic CU-3E19RBU-5 Service Manual

Also see for CU-3E19RBU-5: Operating instructions

Panasonic CU-3E19RBU-5 Service Manual Manual pdf 56 page image

5613.7 Extreme Low Temperature Compressor low pressure protection control(Heat) This control is to prevent low pressure drops too low during extremely low outdoor ambient temperature toimprove the compressor reliability. During heating operation, when outdoor ambient temperature is in Zone 1, this control will be activated.Compressor frequency restriction will be based on outdoor piping temperature.13.8 Deice Control When outdoor pipe temperature and outdoor air temperature is low, deice operation starts where indoor fanmotor and outdoor fan motor stop, indoor unit horizontal vane close and operation LED blink with compressor ON.13.9 Time Delay Safety Control (Restart Control) The compressor will not restart within three minutes after compressor is stopped. This control is not applicable if the power supply reset or after deice condition.13.10 30 seconds Force Operation Once the compressor starts operation, it will not stop its operation for 30 seconds in order to cycle backcompressor oil. However, it can be stopped using remote control or Auto OFF/ON button at indoor unit.13.11 Total Current Control By referring to table below, during normal (default) operation, the running current refer to Hi values and duringPower Save Mode, the running current refer to Lo values. When the outdoor unit total running current (AC) exceeds X value, compressor frequency will decrease. If the running current does not exceed X value for 5 seconds, compressor frequency will increase. However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for3 minutes.Operation Mode CU-3E19RBU-5 CU-4E24RBU-5X (A) Y (A) X (A) Y (A)Cooling/Soft Dry (A) Hi 14.017.518.0623.07Lo 9.8 12.63Cooling/Soft Dry (B) Hi 14.0 17.32Lo 9.8 12.63Heating Hi 14.0 20.33Lo 9.8 14.03Zone 023.0°F (-5°C)26.6°F (-3°C)Zone 1OD tempComp freqfreeComp freqrestrictedComp freqstop-13.0°F (-25°C)-9.4°F (-23°C)-18.4°F (-28°C)-14.8°F (-26°C)OD pipe