16SYSTEM OPERATING CONDITIONSOPERATING RANGE MIN / MAX °F (°C)COOLING HEATINGOutdoor DB -4~122 (-20~50) -22~86 (-30~30)NOTE: If the air conditioner is used beyond the aboveconditions, certain safety protection features may engageand cause the unit to operate abnormally.ELECTRONIC FUNCTIONSMain ProtectionThree Minute Delay for Compressor RestartLess than a 1 minute delay for the initial start−up and a 3 minutedelay for subsequent starts.Compressor Top Temperature ProtectionThe unit stops working when the compressor top temp. protectorcuts off, and restarts after the compressor top temp. protectorrestarts.Compressor Discharge Temperature ProtectionWhen the compressor discharge temp. increases, the runningfrequency is limited per the following rules: Compressor discharge temp. T5>239° F(115° C) for 5s,compressor stops and restarts up until T5<194° F (90° C) 110° F(115° C), decrease the frequency to thelower level every 2 minutes. 221° F(105° C)° F(110° C), keep running at thecurrent frequency. T5<221° F(105° C), no limit for frequency.Fan Speed is Out of ControlWhen the indoor fan speed remains low (lower than 300RPM) for50s, the indoor fan shuts off and restarts 30s later. If the protectionmode engages 3 times when the fan motor restarts continuously,the unit stops and the LED displays the failure.When the outdoor fan speed remains low (lower than 100RPM) ortoo high (higher than 1500RPM) for 60s, the unit stops and theLED displays the failure. The malfunction clears 30s later.Inverter Module ProtectionThe inverter module has a protection function for current, voltage andtemperature. If any of these protections engage, the correspondingcode displays on the indoor unit and the unit stops working.Indoor Fan Delayed Open FunctionWhen the unit starts up, the louver is active immediately and theindoor fan opens 10s later. If the unit is running in the Heating mode,the indoor fan is controlled also by the anti−cold wind function.Compressor Preheating FunctionsPreheating Permitting Condition:If T4＜37.4° F(3° C) and the machine connects to power supply newlywithin 5 seconds or if T4＜37.4° F(3° C) and the compressor hasstopped for over 3 hours, the compressor heating cable will work.Preheating Mode:A weak current flow through the compressor coil from thecompressor wiring terminal, then the compressor is heated withoutoperation.Preheating Release Condition:If T4≥41° F(5° C) or the compressor starts running, the preheatingfunction stops.Condenser High Temperature T3 Protection: 131° F(55° C)° F(60° C), the compressorfrequency decreases to the lower level until to F1 andthen runs at F1. If T3<129.2° F(54° C), the compressorkeeps running at the current frequency. T3<125.6° F(52° C), the compressor does not limit thefrequency and resumes the former frequency. T3>140° F(60° C) for 5 seconds, the compressor stopsuntil T3<125.6° F(52° C).Evaporator Low Temperature T2 Protection: T2<32° F(0° C), the compressor stops and restarts whenT2≥41° F(5° C). 32° F(0° C)≦T2<39.2° F(4° C), the compressor frequencyis limited and decreases to the lower level 39.2° F(4° C)≤T2<44.6° F(7° C), the compressor retainsthe current frequency T2>44.6° F(7° C), the compressor frequency is notlimited.Operation Modes and FunctionsFan Mode1 Outdoor fan and compressor stop.2 Temperature setting function is disabled and no settingtemperature is displayed.3 Indoor fan can be set to high/med/low/auto.4 The louver operates the same as in cooling mode.5 Auto fanFig. 12 – Fan Mode7A DC_FAN_HI_SPD_ADDB DC_FAN_MID_SPD_ADDC DC_FAN_MIN_SPD_ADDD DC_FAN_SLOW_SPD_ADDE DC_FAN_SSLOW_SPD_ADD28ć(82.4°F)19ć(66.2°F)17ć(62.6°F)26ć(78.8°F)25ć(77°F)23ć(73.4°F)22ć(71.6°F)20ć(69°F)ABCDEADDDDDDDDDDDDDDD_AAAADDDDDDDDDDD_ADDDDDDDDDDDDDDPD_AAAADDDDDDDDDDDDSPD_AAAAAAAAADDDDDDDDDDDDDDDDDDDDDDFig. 13 – Outdoor Fan Running Rules
