Hermetic Compressor - Tecumseh

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76 SERVICE HANDBOOK Refrigerant Line Sizes R-12, R-134a and R-404A Refrigerant Line Sizes for Remote Systems Commercial Refrigeration Refer to Tables 5-1 through 5-8. The recommended suction line sizes are based on a pressure drop no greater than the equivalent of a 1.5°F change in saturation temperature. The resulting pressure drop should provide sufficient refrigerant velocities necessary for proper oil return for suction lines up to 100 ft in length. Suction line sizes that provide a minimum 1500 ft/min velocity are provided as a reference when sizing risers. On heat pump systems, the lines serving as both a discharge line and suction line should be sized as a suction line. Refer to these installation considerations for good oil return on commercial systems. • Slope horizontal suction line downwards in the direction of the compressor at least ½” fall per 10 feet of line. • For systems using a thermostatic expansion valve (TEV), the valve should be set to its proper setting. A typical superheat setting for commercial refrigeration applications is 6°F to 8°F. For low temperature refrigeration, a superheat setting of 4°F to 6°F is usually appropriate. • In the case of a flooded type evaporator (bottom feed, top suction header, large internal volume, low refrigerant/oil velocities), it is necessary to maintain a liquid spillover into the suction line so as to return the oil with the liquid refrigerant and to minimize oil trapping in the evaporator. If because of the spillover, the return gas is “wet” at the compressor, a suction line accumulator should be installed adjacent to the compressor. • Install a suction accumulator to prevent liquid refrigerant from entering the compressor, particularly when long suction lines are being used. • On multiple evaporator systems, prevent oil and refrigerant from collecting in an idle coil. If the evaporator coils are to operate independently of each other, each should have its own suction riser sized to the coil’s capacity. • Insulate suction lines. • Suction lines longer than 100 ft are not recommended. The recommended discharge line sizes are based on a pressure drop no greater than the equivalent of a 1.5°F change in saturation temperature. Discharge line sizes that provide a minimum 1500 ft/min velocity are provided as a reference when sizing risers. The recommended liquid line sizes are based on a pressure drop no greater than the equivalent of a 1°F change in saturation temperature. Liquid lines sizes that provide a minimum 100 ft/min velocity are provided as a reference.
77 Table 5-1: R-22 Refrigerant Line Sizes, 45°F Evap Temp, 65°F Suction Vapor Temp, 105°F Condensing and Liquid Temp Cond. Unit CAPACITY (Btu/h) Line Size, Type L Copper OD (in) SUCTION LINE SIZE OD (in) Line Length, Equivalent Feet Velocity = 1500 fpm* LIQUID LINE SIZE OD (in) Line Length, Equivalent Feet Velocity = 100 fpm* DISCHARGE LINE SIZE OD (in) Line Length, Equivalent Feet 10 25 50 100 10 25 50 100 10 25 50 100 Velocity = 1500 fpm* 1,000 1/4 1/4 5/16 5/16 3/16 3/16 3/16 3/16 3/16 ~ 3/16 3/16 1/4 1/4 ~ 2,000 1/4 5/16 5/16 3/8 1/4 3/16 3/16 3/16 1/4 ~ 1/4 1/4 1/4 5/16 3/16 3,000 5/16 5/16 3/8 1/2 5/16 3/16 3/16 1/4 1/4 3/16 1/4 1/4 5/16 3/8 3/16 4,000 5/16 3/8 3/8 1/2 5/16 3/16 1/4 1/4 1/4 3/16 1/4 5/16 5/16 3/8 1/4 6,000 3/8 3/8 1/2 1/2 3/8 3/16 1/4 1/4 5/16 1/4 5/16 5/16 3/8 1/2 5/16 8,000 3/8 1/2 1/2 5/8 3/8 1/4 1/4 5/16 5/16 1/4 5/16 3/8 1/2 1/2 5/16 10,000 1/2 1/2 1/2 5/8 1/2 1/4 1/4 5/16 5/16 5/16 3/8 3/8 1/2 1/2 3/8 12,000 1/2 1/2 5/8 5/8 1/2 1/4 5/16 5/16 3/8 5/16 3/8 1/2 1/2 1/2 3/8 18,000 1/2 5/8 5/8 3/4 5/8 1/4 5/16 3/8 3/8 3/8 3/8 1/2 1/2 5/8 3/8 24,000 5/8 5/8 3/4 7/8 3/4 5/16 3/8 3/8 1/2 3/8 1/2 1/2 5/8 5/8 1/2 30,000 5/8 3/4 7/8 7/8 3/4 5/16 3/8 1/2 1/2 1/2 1/2 5/8 5/8 3/4 5/8 36,000 5/8 3/4 7/8 1 1/8 7/8 5/16 3/8 1/2 1/2 1/2 1/2 5/8 3/4 3/4 5/8 48,000 3/4 7/8 1 1/8 1 1/8 7/8 3/8 1/2 1/2 5/8 5/8 5/8 5/8 3/4 7/8 3/4 60,000 3/4 7/8 1 1/8 1 1/8 1 1/8 3/8 1/2 1/2 5/8 5/8 5/8 3/4 7/8 7/8 3/4 72,000 7/8 7/8 1 1/8 1 3/8 1 1/8 1/2 1/2 5/8 5/8 3/4 5/8 3/4 7/8 1-1/8 7/8 * Largest line size that will maintain the stated refrigerant velocity. Please consult industry references such as the ASHRAE Refrigeration Handbook for additional information regarding how to properly size suction and discharge line risers and condenser to receiver condensate lines.
Page 1:
Hermetic Compressor Service Handboo
Page 5 and 6:
Handbook Purpose and Description Te
Page 7:
Table of Contents Servicing 29 Intr
Page 10 and 11:
2 SERVICE HANDBOOK Introduction Tec
Page 12 and 13:
4 SERVICE HANDBOOK Refrigerants and
Page 14 and 15:
6 SERVICE HANDBOOK Prevention of Wa
Page 17 and 18:
Model and Application Chapter 2
Page 19 and 20:
11 AEA4440YXA XC Condensing Unit Mo
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13 Table 2-1: Serial Label Month Id
Page 24 and 25:
16 SERVICE HANDBOOK Single-phase Co
Page 26 and 27:
18 SERVICE HANDBOOK Minimum startin
Page 28 and 29:
20 SERVICE HANDBOOK External Line-B
Page 30 and 31:
22 SERVICE HANDBOOK Relay Type Tabl
Page 32 and 33:
24 SERVICE HANDBOOK FIGURE 3-16: Po
Page 34 and 35: 26 SERVICE HANDBOOK Capacitor Type
Page 37 and 38: Servicing Chapter 4
Page 39 and 40: Servicing 31 Introduction to Servic
Page 41 and 42: 33 Step 1: Check for a Ground Fault
Page 43 and 44: 35 Table 4-1: Troubleshooting Chart
Page 45 and 46: 37 Table 4-1: Troubleshooting Chart
Page 47 and 48: 39 Complaint Possible Causes Respon
Page 49 and 50: 41 electrocution, always follow the
Page 51 and 52: 43 Checking for Other Electrical Pr
Page 53 and 54: 45 Step 1: Before Continuing with T
Page 55 and 56: 47 Step 1: Before Continuing Troubl
Page 61 and 62: 53 This CSIR compressor has the fol
Page 63 and 64: 55 Step 6: Check Start Capacitor CA
Page 67 and 68: 59 This CSR compressor has the foll
Page 69 and 70: 61 to the OEM service information.
Page 81 and 82: Installation and Replacement Chapte
Page 83: 75 Discharge Tube Discharge Tube AK
Page 87 and 88: 79 Table 5-4: R-134a Refrigerant Li
Page 89 and 90: 81 Table 5-7: R-404A Refrigerant Li
Page 91 and 92: 83 7. If a suction line accumulator
Page 93 and 94: 85 WARNING! Never use a compressor
Page 95: 87 Replacing Compressors in Water-U
Page 98 and 99: 90 SERVICE HANDBOOK Control of Liqu
Page 100 and 101: 92 SERVICE HANDBOOK Crankcase Heate
Page 102 and 103: 94 SERVICE HANDBOOK Starting a Syst
Page 104 and 105: 96 SERVICE HANDBOOK FIGURE 6-10: Li
Page 106 and 107: 98 SERVICE HANDBOOK Accumulator Sel
Page 109 and 110: Appendix
Page 111 and 112: 103 Condenser Fan Receiver Tank Hea
Page 113 and 114: 105 Reciprocating Compressor FIGURE
Page 115 and 116: 107 Table A-1: continued Capillary
Page 117 and 118: 109 Source Table A-4: Most Common O
Page 120: When it comes to compressors... Thi
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Hermetic Compressor - Tecumseh

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