![Haier 3U19FS2ERA Service Manual Manual pdf 55 page image](https://manuals-archive2.s3.amazonaws.com/5131676/8c5cd5942769c90255ed1399cb2d95ff55f.jpg)
the system will enter the remote setting status.7.1.19 Test programFirst, connect the test program terminal on the mainboard, then connect the system to the powercircuit. The test program will operate as follows.HV series display: The buzzer rings for one time—the signal will be sent to outdoor system for 0.5second— the violet is sent for 0.5-- the background light turns to white—the back ground light turns towhite—the background light turns to white—the background light is fully lighted for 0.5 second—LEDscreen lights for 0.5 second— the step-in motor fully output for 0.5 second—then the motor doesn’toutput for 0.5 second—the motor fully output again for 0.5 second. The test program finishes.7.1.20 Time cutting function:connect the test program terminal on the mainboard after connecting the system to the power circuit.The CPU of the main control will be 60 times faster.7.2 The control system of outdoor unit7.2.1 The operation frequency of outdoor unit and its control7.2.1.1 The operation frequency control of compressorThe operation frequency scope of compressorMode Minimun operation frequency Maximun operation frequencyzH69zH43gnitaeHzH27zH43noitaregirfeR7.2.1.2 The starting of compressorWhen the compressor is started for the first time, it must be kept under the conditions of58Hz,88Hz for one minute (the overheating protection of the outdoor unit air-blowing temperature,immediately decrease the frequency when the compressor is overflowing and releasing thepressure) then it can be operated towards the target frequency. When the machine runs normally,there’s no such process. After starting the compressor for operation, the compressor should runaccording to the calculated frequency, and every determined frequency for protection should be priorto the calculated frequency.7.2.1.3 The speeds of increasing or decreasing the frequency of the compressorThe speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/secondThe speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds7.2.1.4 The calculation of the compressor’s frequency1 The minimum/maximum frequency limitationA While refrigerating: is the maximum operation frequency of the compressor;Functions and ControlDomestic air conditioner242