Wiring Diagrams
25
Domestic Air Conditioner
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 stoped for 2 minutes, and then close the four-way
valve.
5.2.5 Protection function
5.2.5.1 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 alarm after 4 minutes during which the compressor is started (during the
course of self-detection, there’s no such limitation)
Sensor detection methods: 100 times (one cycle of procedure run is one time, and about 5ms,
detection method for each time: continuously sampling for 8 times, then order them and take the
mean value of the middle 2 values), take the mean value.
TTC
Abnormal stop
230
Decreasing the frequency rapidly
1HZ/second
212
Decreasing the frequency slowly (1HZ/10seconds)
208
The frequency doesn’t change.
199
Increasing the frequency (1HZ/10second)
194
Increasing the frequency
1HZ/1second
TTC>=230°F lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the
indoor, others don’t last.
（°F）
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