Figure 26-1 Large agricultural machinery, like this cotton

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Fundamentals of HVAC/R, First Edition Carter Stanfield • David Skaves

Figure 26-1 Large agricultural machinery, like this cotton picker with an air conditioned cab, is classified as an MVAC-like appliance (Compliments of John Deere)



Figure 26-2 Recovery equipment should be certified by ARI or UL



Figure 26-3 Type 2 and type 3 recovery levels



Figure 26-4 Form for registering refrigerant recovery (Environmental Protection Agency)



Figure 26-5 Decision flow chart for Type II refrigerant recovery levels



Figure 26-6 EPA certification card



Figure 26-7 A refrigerant data log is used to document the amount of refrigerant added to systems containing 50 or more poundsof refrigerant



Figure 26-8 Nonpressurized refrigerant container (Photographs used with permission from Whirlpool Corporation.)



Figure 26-9 Connection of a system dependent recovery device to a small appliance with an operational compressor



Figure 26-10 Connection of a system dependent recovery device to a small appliance with a nonoperational compressor



Figure 26-11 Connection of a system dependent recovery device using a vacuum pump



Figure 26-12 Self contained recovery devices



Figure 26-13 Most self contained recovery devices consist of a compressor, a condenser, and control valves (Courtesy of Ritchie Engineering Company, Inc.—YELLOW JACKET Products)



Figure 26-14 Hoses with low loss fittings



Figure 26-15 Short hose sections with manual shut off valves



Figure 26-16 Refrigerant recovery cylinder (Courtesy National Refrigerants, Inc.)



Figure 26-17 The cylinder specifications are stamped into the collar of the cylinder



Figure 26-18 This cylinder has a service pressure of 350 psig



Figure 26-19 The weight of the water to completely fill this cylinder is 47.6 lb



Figure 26-20 This cylinder weighs 28.1 lb empty



Figure 26-21 This cylinder was manufactured in July, 1998



Figure 26-22 The last date that this cylinder may be used is 10 years after its date of manufacture



Figure 26-23 Recovery cylinder safety relief valve



Figure 26-24 Safe fill level for common refrigerants and cylinder capacities



Figure 26-25 Some recovery cylinders have a float that shuts off the recovery unit when the cylinder is 80% full



Figure 26-26 Begin recovery at the liquid line entering the evaporation when the condenser is located above the evoporator



Figure 26-27 Begin recovery at the outlet of the condenser when the condenser is located below the receiver



Figure 26-28 The frost line on this accumulator indicates there is still liquid sitting in the bottom



Figure 26-29 Cooling the recovery cylinder in ice can speed system recovery by keeping the cylinder pressure low



Figure 26-30 Recovery unit connected to cylinder to perform active cooling on the cylinder



Figure 26-31 Recovery unit with subcooling connection for maintaining a low recovery cylinder temperature and pressure (Courtesy of Ritchie Engineering Company, Inc.—YELLOW JACKET Products)



Figure 26-32 Recovery from both sides of the system when performing vapor refrigerant recovery



Figure 26-33 Process stub on a compressor



Figure 26-34 Bolt on piercing valve installed on a system



Figure 26-35 Braze on piercing valve installed on a system



Figure 26-36 Piercing pliers



Figure 26-37 Schrader access valve on process stub of small appliance



Figure 26-38 These old “monitor top” refrigerators contain SO2; this refrigerant should not be recovered (Science Museum/Science & Society Picture Library



Figure 26-39 All the refrigerant is trapped between the compressor discharge valve and the king valve when the system is pumped down



Figure 26-40 Front seating the king valve keeps refrigerants from leaving the liquid receiver



Figure 26-41 The liquid line service valve on residential split systems can be used to pump the system down



Figure 26-42 Liquid recovery using the push-pull method (Courtesy of Bacharach, Inc.)



Figure 26-43 Recovery unit connected for direct liquid refrigerant recovery (Courtesy of Bacharach, Inc.)



Figure 26-44 The recovery unit’s valves are positioned for liquid recovery



Figure 26-45 The recovery unit’s valves are positioned for vapor recovery



Figure 26-46 Recovering to 5 in Hg vacuum will help ensure that the system pressure will stay at or below 0 psig when the recovery unit is shut off



Figure 26-47 The recovery unit valves are positioned to purge its condenser of refrigerant



Figure 26-48 Very high pressure recovery unit (Courtesy of Redi Controls, Inc. Refrigerant Mizer Model RS-503/13-C3)



Figure 26-49 Purge unit on low pressure chiller (Courtesy of Reftec International Inc. 800-214-4883.)



Figure 26-50 Circulating warm water in a low pressure chiller to raise the evaporator pressure to 0 psig (Courtesy of Reftec International Inc. 800-214-4883.)



Figure 26-51 Refrigerant escaping through a broken rupture disk on a low pressure chiller



Figure 26-52 On-site recovery vessel for large low pressure chiller (Courtesy of Reftec International Inc. 800-214-4883.)



Figure 26-53 On-site recovery vessel for large low pressure chiller (Courtesy of Reftec International Inc. 800-214-4883.)



Figure 26-54 This warning is required on all products containing ozone depleting substances



Figure 26-55 The system design pressures are shown on the data plate; the top data plate is for an R-410A unit, and the bottomdata plate is for an R-22 unit



Figure 26-56 Large leaks blow bubbles when a soapy solution is used



Figure 26-57 Small leaks create micro-bubbles that collect into a froth after several minutes



Figure 26-58 Ultrasonic leak detector (Courtesy Robinair SPX10TC)



Figure 26-59 A pressure regulator and a pressure relief valve should always be used when using nitrogen for pressure testing



Figure 26-60 Halide torch leak detector



Figure 26-61 The red-hot copper disk breaks down the refrigerant when it passes over the disk



Figure 26-62 A large stream of CFC or HCFC refrigerant will cause a bright fluorescent blue flame color



Figure 26-63 Most leaks cause a pale green flame color



Figure 26-64 Electronic leak detectors



Figure 26-65 Older style corona discharge electronic detector



Figure 26-66 Heated diode electronic leak detector



Figure 26-67 Oily spots around mechanical or brazed joints can indicate a refrigerant leak



Figure 26-68 Ultraviolet dye makes small leaks visible that might not be detected using other methods



Figure 26-69 The spray pattern makes a mess when refrigerant gauges are removed from a system containing dye; the top picture shows what the area looks like without the black light; the bottom picture shows the same area with the black light; this should be cleaned up before leaving the job

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Figure 26-1 Large agricultural machinery, like this cotton