Panasonic WH-SDF09C3E8 Service Manual

Also see for WH-SDF09C3E8: Design handbook Operating instructions Operating instructions

Contents

Panasonic WH-SDF09C3E8 Service Manual Manual pdf 62 page image

6213.1.6 Low Frequency Protection Control 1 When the compressor continuously operates at frequency lower than 25 Hz for 240 minutes, the operationfrequency will change to 24 Hz for 2 minutes.13.1.7 Low Frequency Protection Control 2 When all the below conditions comply, the compressor frequency will change to lower frequency.Temperature, T, for: HeatingOutlet water (°C) T < 14 or T 48Outdoor air (°C) T < 4 or T 24Indoor heat exchanger (°C) T 013.1.8 High Pressure Sensor Control Purpose:- To protect the system operation. Detection period:- After compressor on for 5 minutes. Detection conditions:- When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously. After detection:- When abnormality is detected continue 5 seconds, unit stop operation.- OFF/ON control panel LED will blink (H64 error occurs).13.1.9 Outside Temperature Current Control13.1.10 Crank Case Heater Control Purpose:- For compressor protection during low outdoor ambient operation (during heating low temperature operation). Control content:a. Trigger heater START conditiono When the outdoor air temperature is 4°C or below, and discharge temperature is 11.6°C or below.b. Resetting heater STOP condition1. When the outdoor air temperature exceeds entry condition (6°C)2. When the discharge temperature exceeds entry condition (18.8°C)13.2 Protection Control for Heating Operation13.2.1 Outdoor Air Temperature ControlThe maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoidcompressor overloading.13.2.2 Deice OperationWhen outdoor pipe temperature and outdoor air temperature is low, deice operation start where outdoor fan motorstop.