Carrier 38QUS014DS2 series, Service Manual

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17
Electronic control function
17.1 Abbreviation
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.
17.2.1 Input voltage: 198V~264V.
17.2.2 Input power frequency:50Hz.
17.2.3 Indoor fan normal working amp. is less than 1A.
17.2.4 Outdoor fan. normal working amp. is less than 1.5A.
17.2.5 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 d
isplays “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
frequency and “LC”(each displays 0.5s)

In forced cooling mode, the L
ED displays “FC” or alternative displays between running frequency and
“FC”(each displays 0.5s)

When PFC module protection occurs three times within 15 minutes,
the LED displays “E6” or
alternative displays between running frequency and “E6”(each displays 0.5s)

In protection or malfunction, the LED displays error code or protection code.