Pioneer LISAS-B-1403 Service Manual

Electrical Control Function104 Electrical Control System1. Electrical Control FunctionDefinitionT1: Indoor room temperatureT2: Coil temperature of indoor heat exchanger middle.T2B: Coil temperature of indoor heat exchanger outlet.T3: Coil temperature of condenserT4: Outdoor ambient temperatureT5: Compressor discharge temperature1.2 Main Protection1.2.1 Time delay at restart for compressor.1.2.2 Temperature protection of compressor topThe unit will stop working when the compressor top temp. protector cut off, and will restart after thecompressor top temp. protector restart.1.2.3 Temperature protection of compressor dischargeWhen the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:For 12K-18K units & MUE-24HRFN1-MW, MTB-24HRFN1-MW, MCD-24HRFN1-MW：---Compressor discharge temp. T5>115℃ for 5s, compressor stops.---108℃, decrease the frequency to the lower level every 3 minutes till F1.---90℃, keep running at the current frequency.----T5<90℃, no limit for frequency.For other units:----If 102℃℃, decrease the frequency to the lower level every 2 minutes till to F1.---If T5>115℃ for 10 seconds, the compressor will stop and restart till T5<90℃.1.2.4 Sensor protection at open circuit and breaking disconnection.1.2.5 Indoor fan delayed open functionWhen the unit starts up, the louver will be active immediately and the indoor fan will open 10s later.If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function.1.2.6 Fan speed is out of controlWhen Indoor Fan Speed keeps too low for 50s, the unit will stop and the LED will display the failure