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0 0 RECOVERY REQUIREMENTS Refrigerant Recovery and/or Recycling equipment manufactured after November 15, 1993, must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards. All equipment must have low loss fittings to minimize refrigerant loss when hoses are disconnected. The following is a list of the required levels of evacuation for Low Pressure appliances: Using recovery or recycling equipment manufactured or imported before Nov. 15, 1993 25 inches Hg Using recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 25 mm Hg absolute Once the required vacuum has been achieved, the technician should wait for a few minutes and monitor the system pressure. If the pressure rises, indicating that there is refrigerant remaining in the system, recovery must be repeated. When leaks in an appliance make evacuation to the prescribed level unattainable, the appliance should be evacuated to the lowest attainable level prior to a major repair. REFRIGERA TION NOTES (Review vapor/compression system in introduction) 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. If a strong odor is detected during the recovery process, a compressor burn -out has likely occurred. When recovering refrigerant from a system that experienced a compressor bum -out, watch for signs of contamination in the oil. Because chillers using refrigerants such as CFC -11 and HCFC -123 operate below atmospheric pressure, they require a purge unit. The primary purpose of a purge unit is to remove non-condensables from the system. A centrifugal chiller's purge condensing unit takes its suction from the top of the condenser, removes air and other non-condensables from the system, and returns refrigerant to the evaporator. Although a high efficiency purge unit discharges a low percentage of refrigerant with the air they remove, frequent purging and subsequent refrigerant loss can indicate that a leak is allowing air into the system. High discharge pressure is also an indication of air in the system Excessive moisture collection in the purge unit can indicate tube leakage. To protect the system from over -pressurization, low-pressure chillers typically use a rupture disc mounted on the evaporator housing. The typical design burst pressure for a rupture disc is 15 psig. SAFETY (Additional Safety and shipping information is covered in the core section of this manual.) ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLV -TWA, (threshold limit value — time weighted average). A refrigerant monitor is required for all ASHRAE refrigerant safety groups. CFC -12, CFC -11, and HFC -134a are code grouped as A-1. R-123 is code grouped as B-1. All refrigeration systems must be protected by a pressure relief valve (s) (must not be installed in series). Additional Safety and shipping information is covered in the core section of this manual gg;EW �� MpY l a 2015 eWkRONME�TAT