Functions and control
Domestic air conditioner
TTC（°F）
Abnormal stop
230
Decreasing the frequency rapidly（1HZ/second）
215.6
Decreasing the frequency slowly (1HZ/10seconds)
208.4
The frequency doesn’t change.
199.4
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.
7.1.4.2 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). TC=indoor coil temp.
The indoor heat exchanger sensor tests the temperature of the indoor heat exchanger. If the
temperature is higher than 131°F, 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 116.6°F, recover to the normal control.
TC(°F) The compressor stops Fgh_t1 149°F
Fgh_t1－2
Fgh_t2－2 N Decreasing the frequency rapidly Fgh_t2 138.2°F
P Decreasing the frequency slowly Fgh_t3 131°F
Fgh_t3－2
Fgh_t4—2 Q Prohibiting increasing the frequency Fgh_t4 123.8°F
R Increasing slowly Fgh_t5 116.6°F
Fgh_t5—2
Normal
N：Decreasing at the speed of 1HZ/1 second
P：Decreasing at the speed of 1Hz/10 seconds
Q：Continue to keep the last-time instruction cycle
R：Increasing at the speed of 1Hz/10seconds
Remarks: the outdoor unit
7.1.4.3 The control of preventing the over current of the compressor:
During the starting process of the compressor, if the current of the compressor is greater than 11A for
3 seconds, stop the compressor and alarm, after 3 minutes, start it again, if
such state appears 3
times in 20 minutes, stop the compressor and alarm, and confirm the malfunction. Then continue to
run it only after the power is off.
During the starting process of the compressor, if the AC current is greater than 8.5A, the frequency of
the compressor decreases at the speed of 1HZ/second.
During the starting process of the compressor, if the AC current is greater than 8A, the frequency of
the compressor decreases at the speed of 0.1HZ/second.
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