When the outdoor unit is shut down, the valve is opened completely for 2 minutes, and then
begin initialization.
The scope of refrigerationg valve 90-----480 steps
The scope of heating valve 70-----480 steps
The valves are adjusted according to the degree of superheat
SHa SHa.
7.1.2 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 stoped for 2 minutes, and then
close the four-way valve.
7.1.3 Protection function
7.1.3.1 TTC high temperature-preventing protection
Once the machine is started, it can run TTC overheating protection of air-blowing, but air-blowing
sensor malfunction must alarmafter10minutes during which the compressor is started (during the
course of self-detection, there’s no such limitation)
TTC
TTC>=116 lasts for 20 seconds. Overheating protection of air-blowing,
alarm malfunction to the indoor, others don’t last.
TC high temperature-preventing control of the indoor heating unit
Tpg_indoor is the highest value of the effective indoor unit (start it and it is in accord with the
running state).
The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If the
temperature is higher than 54
, decrease the rotate speed of the compressor and do the high
temperature-preventing protection of the indoor heat exchanger; if the temperature of the indoor
heat exchanger is lower than 44
, recover to the normal control.
7.1.3.2
Functions and control
Domestic air conditioner
18
abnormal stop
Maintain current frequency
Electric control contact (normal operation)
compressor stops for
more than 3 minutes
TTC< 92℃
Compressor start to restore normal control
If there are three failures in three minutes,
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