Protection Function - Haier HSU09 VHG(DB)-G&W Service Manual

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
110
100
98
93
90
TTC>=110
indoor, others don't last.
HSU09VHG(DB)-SM
Abnormal stop
Decreasing the frequency rapidly 1HZ/second
Decreasing the frequency slowly (1HZ/10seconds)
The frequency doesn't change.
Increasing the frequency (1HZ/10second)
Increasing the frequency 1HZ/1second
lasts for 20 seconds. Overheating protection of air-blowing, alarm malfunction to the
25
Functions and control
Domestic Air Conditioner