Haier HSU24VHG(DB)-G&W, Service Manual

Page: 28 / 98

Domestic Air Conditioner
27
protection.
5.3 Value of Thermistor
5.3.1 intdoor Unit
Room sensor and Pipe Sensor
Functions and Control
5.2.5.6 The frequency limitation of modification rate
In the field which is controlled by high frequency, if the modification rate is not high enough, the
control-driven chip will enter into weak magnetic control, this will help to relieve the problem of
modification rate. If during the course of weak magnetic control, the modification rate is still not high
enough, enter into the control of decreasing frequency until the alarm of modification rate is relieved.
5.2.5.7 Temperature protection of the outdoor refrigerating coil
When the defrosting temperature and the sensor’s temperature are higher than 217 ,the frequency of
the compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowest
frequency. When the temperatures are lower than and higher than , keep the frequency of
the compressor. When the temperatures are lower than , relieve the defrosting temperature
When Tpg_indoor begins to rise again, and ice_temp_15≤ Tpg_indoor ≤ ice_temp_19 the frequency
of thecompressor doesn’t change.
When ice_temp_3 LJ Tpg_indoor LJ ice19 ,the frequency of the compressor increases at the
speed of 1HZ/10seconds.
For example, Tpg_indoor ≤ 9 ˈ last for 2 minutes, and then the outdoor unit will stop, and report
underload malfunction, but don’t send malfunction report to the indoor.
The compressor stops for more than 3 minutes, Tpg_indoor> ice19 , the compressor
recovers.
R 89 = 10K
¡f
3%
B89 / 169 = 3700K
f
3%
217 201
201
°F
°F
°F
°F
°F
°F
°F
°F
°F
°F
°F