Hermetic Compressor - Tecumseh

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94 SERVICE HANDBOOK Starting a System with Liquid Refrigerant in the Compressor When most air conditioning and commercial systems are started up for the first time each season, a large part of the system refrigerant charge is in the compressor. If there is no crankcase heater or the heat is not operating properly and the unit must be started at the time of the service, then follow these guidelines: • DO NOT attempt to heat the crankcase by applying a flame to the compressor. Not only is this process slow and likely to be ineffective, it may damage electrical wires, paint, and the oil. • If there is no evidence of a compressor electrical problem (for example, tripped breaker or blown fuse or reports of such), then “jog” the compressor. To “jog” the compressor, apply power for one to two seconds, then wait 1 to 2 minutes. After 3 or 4 jogs, apply power continuously. WARNING! Jogging a compressor that has an electrical problem can increase the likelihood of terminal venting. To reduce the risk of serious burns or death from terminal venting with ignition, you must FIRST check for a ground fault whenever you suspect an electrical problem. See “Identifying Compressor Electrical Problems” on pages 40-41 for additional information. Line 1 Line 2 Ground Compressor - Unit Ground L 1 Rela y - Potential L 2 T 2 5 Hi 2 Side Bleeder Fan Resistor 1 Start Capacitor Bleeder Resistor Single Pole Contactor or On - Off Switch A C B External Thermal Protector C Star t Winding Run Capacitor Single Can (Split Capacitor Optional) R Temperature Control (Room Air Conditioner) S Internal Thermal Protector (optional) Motor Main Winding Single Phase - PSC Type Single Phase - CSR Type Potential Rela y FIGURE 6-8: Wiring diagram for PSC compressor with run capacitance off-cycle heat.
95 Control of Liquid Refrigerant Floodback to the Compressor During Operation Liquid floodback during operation (see Figure 6-9) can be caused by fan failure or dirty clogged filters that can reduce the heat transfer rate to such a point that the liquid refrigerant floods through instead of vaporizing. When this situation occurs, liquid refrigerant may enter the compressor under conditions that result in separation of the oil and refrigerant. This separation may result in an accumulation of the refrigerant under the oil (see Figure 6-10). Thus, when the compressor is started, the first liquid to be pumped to the bearings will probably be refrigerant, not oil. Even if this oil-refrigerant separation does not occur, the large amount of liquid refrigerant in the crankcase will instantly vaporize and boil away the oil charge when the compressor starts (see Figure 6-11) thereby leaving the compressor oil-starved for many seconds (see Figure 6-12). High Pressure Gas High Pressure Liquid Low Pressure Liquid Low Pressure Gas Filter Fan Fan Evaporator Condenser Expansion Device Compressor FIGURE 6-9: Liquid refrigerant floodback to the compressor.
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Hermetic Compressor Service Handboo
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Handbook Purpose and Description Te
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Table of Contents Servicing 29 Intr
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2 SERVICE HANDBOOK Introduction Tec
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4 SERVICE HANDBOOK Refrigerants and
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6 SERVICE HANDBOOK Prevention of Wa
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Model and Application Chapter 2
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11 AEA4440YXA XC Condensing Unit Mo
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13 Table 2-1: Serial Label Month Id
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16 SERVICE HANDBOOK Single-phase Co
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18 SERVICE HANDBOOK Minimum startin
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20 SERVICE HANDBOOK External Line-B
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22 SERVICE HANDBOOK Relay Type Tabl
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24 SERVICE HANDBOOK FIGURE 3-16: Po
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26 SERVICE HANDBOOK Capacitor Type
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Servicing Chapter 4
Page 39 and 40:
Servicing 31 Introduction to Servic
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33 Step 1: Check for a Ground Fault
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35 Table 4-1: Troubleshooting Chart
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37 Table 4-1: Troubleshooting Chart
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39 Complaint Possible Causes Respon
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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 and 84: 75 Discharge Tube Discharge Tube AK
Page 85 and 86: 77 Table 5-1: R-22 Refrigerant Line
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 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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