Haier AB122ACERA Service Manual - Page 38

Commercial Air Conditioner Model: AU122AEERA AB122ACERA AC122ACERA AD122ALERA and LED1 are black out. 1.9 Time shorting function Time shorting function: If the time shorting port is in short circuit after electrifying CJ601, the unit will perform a 1/60 time shorting control. 1.10 Additional functions 1.10.1 The interval between compressor stop and startup again is 3 minutes, which can protection compressor. If being electrified for the first time, compressor will start up only when the valve opens to the normal operation angle. 1.10.2 Ttc high temperature protection Ttc discharg temp. over-heat protection can be executed once the unit is ON, but the discharge temp. sensor can only alarm after the compressor has started up for 4 minutes. Discharging temp. Ttc 114℃ 111℃ 108℃ 105℃ 95℃ 90℃ quick reduce FQY 2HZ/S quick reduce FQY 1HZ/S slow reduce FQY 1HZ/10S keep FQY slow rise FQY 1HZ/10S If Ttc>=115 keeping for 10s, the discharge temp. over-heat protection excutes and unit stops, resumable after quit the protection. If in 60 minutes the protection occurs for 3 times, the failure can be sent to indoor unit. 1.10.3 In heating indoor Tc high temperature protection Indoor heat exchanger temp. sensor will check the indoor coil temperature, if it is over 55℃, the unit will reduce the compressor motor speed to perform the indoor heat exchanger temp. overhigh protection. If it is below 48℃, the unit will resume to be normal control. P: reduce at the speed of 1Hz/10s Q: remain the previous value R: rise at the speed of 1Hz/10s TC 55℃ 52℃ 48℃ P reduce slowly Q remaining R rise slowly 1.10.4 Over current protection: 38