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OUTSIDE TEMPERATURE IS IRRELEVANT WITH THE PROPER LOW AMBIENT CONTROLS ON THE OUTDOOR UNIT. SOME STANDARD RESIDENTIAL UNITS NEED ELEVATED TEMPERATURES TO MAINTAIN HEAD PRESSURE ABOVE A POINT WHERE THE SUCTION PRESSURE WOULD FALL BELOW THE SATURATED SUCTION TEMPERATURE OF 32 DEG.F, CAUSING ICE TO FORM ON THE INDOOR COIL. CONTROLS MAY BE ADDED TO FAKE THE SYSTEM INTO THINKING IT IS WARMER OUTSIDE. MANY A/C ONLY SYSTEMS ON EQUIPMENT ROOMS, CELLULAR TOWERS, ETC. FUNCTION DOWN TO -40 DEG.F, AS THE NEED FOR COOLING THE EQUIPMENT INSIDE THE BUILDING HAS NO RELATIONSHIP WITH THE OUTSIDE AIR TEMP. LC

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