Functions and control
Adjust frequency:
If |SH|=0, 60s/1 step
If |SH|≥3, and ΔSH=0,10s/ 1 step.
If 3≥ |SH|≥0,30s/ 1 step
ΔSH=current SH-last SH
SH=Ts (suction temp.)-Tc1 (indoor coil temp.) - Tsh (fixed data, depend on different models,-1~2)
5.2.4 Four way control
For the details of defrosting four-way valve control, see the defrosting process.
Four way working in other ways:
Under the mode of heating, open the four-way valve, when the compressor is not started or changed to
non-heating mode, make sure the compressor is stopped for 2 minutes, and then close the four-way valve.
5.2.5 Protection function
When Tpg_indoor begins to rise again, and ice_temp_2≤Tpg_indoor≤ ice_temp_3ć, the frequency of the
compressor doesn’t change.
When ice_temp_3LJTpg_indoorLJice_temp_3+3ć, the frequency of the compressor increases at the speed
of 1HZ/10seconds.
For
example, Tpg_indoor≤0ćˈ
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> ice_temp_3+2ć, the compressor
recovers.
5.2.6 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.
5.2.7 Temperature protection of the outdoor refrigerating coil
When the defrosting temperature and the sensor’s temperature are higher than 68ć, the frequency of the
compressor decreases 1hz/10seconds. Keep the frequency until it decreases to the lowest frequency. When
the temperatures are lower than 68ć and higher than 61ć, keep the frequency of the compressor. When
the temperatures are lower than 61ć, relieve the defrosting temperature protection.
5.2.8 Malfunction display and malfunction handling
a) For the complete appliance’s malfunctions˖Annex 2
If there’s malfunction with the outdoor unit, the light of the outdoor unit will flash and its frequency is
1HZ, the number of times is according to the table, when a round of flashing is finished, the light
should be off for 5 seconds.
Domestic air conditioner
26
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