Electronic Control Function - Carrier 38QUS014D8S2-1 Service Manual

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Electronic control function

17.1 Abbreviation
For AG:
T1: Indoor room temperature
T2: Coil temperature of evaporator
T3: Coil temperature of condenser
T4: Outdoor ambient temperature
Tp: Compressor discharge temperature
Tsc: Ajusted setting temperature
For other models:
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet(This sensor is located in outdoor unit)
T3: Coil temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
Ts: Setting temperature
17.2 Electric control working environment.
1. Input voltage: 198V~264V.
2. Input power frequency:50Hz.
3. Indoor fan normal working amp. is less than 1A.
4. Outdoor fan. normal working amp. is less than 1.5A.
5. Four-way valve normal working amp. is less than 1A.
17.3 Outdoor unit's digital display tube
There is a digital display tube in outdoor PCB.
Digital display tube display function
 In standby , the LED displays "- -"
 In compressor operation, the LED display the running frequency,
 In defrosting mode, The LED displays "dF" or alternative displays between running frequency and
"dF"(each displays 0.5s)
 In compressor pre-heating, The LED displays "PH" or alternative displays between running frequency
and "PH"(each displays 0.5s)
 During the oil return process, The LED displays "RO" or alternative displays between running
frequency and "RO"(each displays 0.5s)
 In low ambient cooling mode, the LED displays "LC" or alternative displays between running
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