Haier HSU-09HEG03/R2(DB) Service Manual page 29

5.2.5.2 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).
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 117°F , recover to the normal control.
TC
Fgh_t1 2
Fgh_t2 2
Fgh_t3 2
Fgh_t4—2
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
5.2.5.3 The control of preventing the overcurrent of the compressor
During the starting process of the compressor, if the curren of the compressor is greater than 17A
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 the power is off.
During the starting process of the compressor, if the AC current is greater than 12A, 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 10A, the frequency
of the compressor decreases at the speed of 0.1HZ/second.
During the starting process of the compressor, if the AC current is greater than 9A, the frequency of
the compressor increases at the prohibited speed.
During the starting process of the compressor, if the AC current is greater than 8A, the frequency of
the compressor increases at the speed of no faster than 0.1HZ/second.
The compressor stops
N Decreasing the frequency rapidly
P Decreasing the frequency slowly
Q Prohibiting increasing the frequency Fgh_t4
R Increasing slowly
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Wiring Diagrams
Fgh_t1 149°F
Fgh_t2 138°F
Fgh_t3 135°F
124°F
Fgh_t5 117°F
Domestic Air Conditioner