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The following is a list of the required recovery levels (in • inches of mercury) for Type 11 appliances: RECEIVE[ MAY 18 2015 AMENTAL t1FnAQTMFNT After reaching the desired vacuum, the technician should wait a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil. Appliances can be evacuated to atmospheric pressure (O psig) if leaks make evacuation to the prescribed level unattainable. The technician must isolate a parallel compressor system in order to recover refrigerant. Failure to isolate a parallel compressor system will cause an open equalization connection that will prevent refrigerant recovery. System -dependant recovery equipment cannot be used on appliances containing more than 15 pounds of refrigerant. Under EPA regulations, a "major repair" means any maintenance, service or repair involving the removal of any or all of the following components: the compressor, the condenser, the evaporator or an auxiliary heat exchanger coil. REFRIGERA TION NOTES (Review vapor/compression system in introduction) For many years, the most common refrigerant used in residential split air conditioning systems was R-22, but with the current changes in the industry, read the nameplate to determine the type of refrigerant used. Filter driers will remove moisture from the refrigerant in a system, but there is a limit to their capacity. Some systems are equipped with a moisture indicating sight glass. When the sight glass changes color, the system contains excessive moisture and will need to be evacuated. The filter -drier should be replaced anytime a system is opened for servicing. If a strong odor is detected during the recovery process, a compressor bum -out has likely occurred. When recovering refrigerant from a system that experienced a compressor burn -out, watch for signs of contamination in the oil. A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of low ambient temperature. Refrigerant in the oil will cause oil foaming in the compressor at start-up. When evacuating a vapor compression system, the vacuum pump should be capable of pulling 500 microns (29.90" hg.) of vacuum. The more accurate and preferred method of measuring a deep vacuum is in nucrons. Warning: A hermetic compressor's motor winding could be damaged if energized when under a deep vacuum. The use of a large vacuum pump could cause trapped water to freeze. During evacuation of systems with large amounts of water, it may be necessary to increase pressure by introducing nitrogen to counteract freezing. Equipment Manufacture Date NFAIT Type of Appliance Before 11/15/93 After 11/15/93 HCFC -22 appliances or isolated components 0 0 of such appliances normally containing less than 200 lbs. of refrigerant. HCFC -22 appliances or isolated components 4 10 of such appliances normally containing more than 200 lbs. of refrigerant. Other, high pressure appliances or isolatec 'such 4 10 component of appliance normal) containing less than 200 lbs. of refrigerant. Other high pressure appliances or isolated 4 15 component of such appliance normal) containing more thith 200 lbs. of refrigerant. Very high pressure appliances 0 0 AMENTAL t1FnAQTMFNT After reaching the desired vacuum, the technician should wait a few minutes to see if the system pressure rises, indicating that there is still refrigerant in liquid form or in the oil. Appliances can be evacuated to atmospheric pressure (O psig) if leaks make evacuation to the prescribed level unattainable. The technician must isolate a parallel compressor system in order to recover refrigerant. Failure to isolate a parallel compressor system will cause an open equalization connection that will prevent refrigerant recovery. System -dependant recovery equipment cannot be used on appliances containing more than 15 pounds of refrigerant. Under EPA regulations, a "major repair" means any maintenance, service or repair involving the removal of any or all of the following components: the compressor, the condenser, the evaporator or an auxiliary heat exchanger coil. REFRIGERA TION NOTES (Review vapor/compression system in introduction) For many years, the most common refrigerant used in residential split air conditioning systems was R-22, but with the current changes in the industry, read the nameplate to determine the type of refrigerant used. Filter driers will remove moisture from the refrigerant in a system, but there is a limit to their capacity. Some systems are equipped with a moisture indicating sight glass. When the sight glass changes color, the system contains excessive moisture and will need to be evacuated. The filter -drier should be replaced anytime a system is opened for servicing. If a strong odor is detected during the recovery process, a compressor bum -out has likely occurred. When recovering refrigerant from a system that experienced a compressor burn -out, watch for signs of contamination in the oil. A crankcase heater is often used to prevent refrigerant from migrating to the oil during periods of low ambient temperature. Refrigerant in the oil will cause oil foaming in the compressor at start-up. When evacuating a vapor compression system, the vacuum pump should be capable of pulling 500 microns (29.90" hg.) of vacuum. The more accurate and preferred method of measuring a deep vacuum is in nucrons. Warning: A hermetic compressor's motor winding could be damaged if energized when under a deep vacuum. The use of a large vacuum pump could cause trapped water to freeze. During evacuation of systems with large amounts of water, it may be necessary to increase pressure by introducing nitrogen to counteract freezing.