HVAC 78 Sr. NO. DONT’S REASON 1 DO NOT USE A/C WITH FRESH MODE OPEN IN DUSTY ENVIRONMENT THIS WILL LEAD TO MIXING OF OUTSIDE AIR WITH COOL AIR INSIDE THEREBY REDUCING COOLING EFFECT. 3 DO NOT OPERATE A/C WITH OUT REFRIGERANT IN THE SYSTEM. THIS WILL RESULT IN PREMATURE FAILURE OF COMPRESSOR. 4 DO NOT LEAK CHECK THE A/C SYSTEM WITH MORE THAN 20 KG/CM’ PRESSURE. HIGHER PRESSURE MAY RESULT IN DAMAGE TO A/C COMPONENTS. 5 DO NOT LEAVE A/C JOINTS OPEN. MOISTURE TENDS TO ENTER THE A/C SYSTEM IF THE JOINTS REMAIN OPEN FOR LONG TIME 6 DO NOT CHARGE REFRIGERANT IN THE A/C SYSTEM WITHOUT CARRYING OUT PROPER VACUUM. IMPROPER OR NO VACUUMING OF THE A/C SYSTEM RESULTS IN LESS COOLING CONDITIONS
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