Functions and control
15 Domestic air conditioner
7. Functions and control
7.1 Main functions and control specification
7.1.1 The operation frequency of outdoor unit and its control
7.1.1.1 The operation frequency control of compressor
The operation frequency scope of compressor˖
Mode Minimum operation frequency Maximum operation frequency
Heating˄18K/24K˅
24 Hz /20Hz 103 Hz /100Hz
Refrigeration˄18K/24K˅
20 Hz /20Hz 85 Hz /85Hz
7.1.1.2 The starting of compressor
When the compressor is started for the first time, it must be kept under the conditions of
38Hz,58Hz,88Hz for 30second,one minute, one minute (the overheating protection of the outdoor unit
air-blowing temperature, immediately decrease the frequency when the compressor is overflowing and
releasing the pressure)ˈthen 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
run according to the calculated frequency, and every determined frequency for protection should be
prior to the calculated frequency.
7.1.1.3 The speeds of increasing or decreasing the frequency of the compressor
The speed of increasing or decreasing the frequency rapidly 1 -----------1HZ/second
The speed of increasing or decreasing the frequency slowly 2 -----------1HZ/10seconds
7.1.1.4 The calculation of the compressor’s frequency
Refrigeration/dehumidification mode:
Pn=(Nh_c- S_c)*10ı50 outdoor environment control
Pn=(Nh_c- S_c) *10˘50 PID control
Heating mode:
Pn=(S_c
-Nh_c) *10ı60 outdoor environment control
Pn=(S_c
-Nh_c) *10˘60 PID control
(Nh_c=indoor environment temperature S_c=setting temperature)
1˅The minimum/maximum frequency limitation
AˊWhile refrigerating: F-MAX-r is the maximum operation frequency of the compressor; F-MIN-r is the
minimum operation frequency of the compressor.
BˊWhile heating: F-MAX-d is the maximum operation frequency of the compressor; F-MIN-d is the
minimum operation frequency of the compressor.
2˅The frequency limitation which is affected by the environment temperature.
(Wh_c= environment temperature)
Heating mode:
Serial No. Temperature scope
Frequency limitation˄18K/24K˅
1 Wh_c<-12 Max_hz1 103HZ/87 HZ
2 Wh_c<-8 Max_hz2 103HZ/87 HZ
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