Hermetic Compressor - Tecumseh

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24 SERVICE HANDBOOK FIGURE 3-16: Potential type relay mounting positions. Selecting Capacitors Never use a capacitor with a lower voltage rating than that specified. A higher voltage rating than that specified is acceptable. Start Capacitor Bleeder Resistors Modern high power factor, low current single-phase compressor motors which required start and run capacitors used with potential type relays can created electrical circuits which could cause starting relay damage resulting in compressor failure. The high voltage stored in the start capacitor could discharge across the contacts of the starting relay thus welding them and preventing the relay from functioning. Capacitor failure and/or starting winding failure could result. To eliminate this, Tecumseh Products Company start capacitors are equipped with bleeder resistors wired across the capacitor terminals. No start capacitor used in conjunction with a potential relay and run capacitor should be installed without such a bleeder resistor. In an emergency where no bleeder resistor equipped capacitors are available, a two watt 15,000 ohm resistor can be obtained and soldered across the capacitor terminals. See Figure 3-17. Start Capacitor Substitution If the specified start capacitor is not available, the next larger sized MFD capacitor at the same or higher voltage rating may be used. Do not add excessive starting capacitance.
25 FIGURE 3-18: 15000 OHMS 2 WATT ± 20% bleeder resistor wired across capacitor terminals. Run Capacitors Since January 1979, capacitors provided by Tecumseh have contained non-PCB oils or have been constructed using non-PCB impregnated metallized paper electrodes and polypropylene dielectric. These capacitors are protected against case rupture by a device within the capacitor can if failure occurs. The operation of this safety device could cause the terminal end to bulge outward ½”. Suitable head space and/or rubber caps should be provided when installing such capacitors. In some instances, for reasons of both space and economics, it is advantageous to use two capacitors whose MFD values add up to the total amount specified. In these cases, the capacitors should be connected in parallel. Rated voltage for each should not be less than that specified. The tolerance on a run capacitor is 10%, and therefore only one rating figure is given. You should not go below this figure on any application. You may exceed this figure by a small amount, and the limits are shown in Table 3-5: Remember the voltage rating of all capacitors must be the same or greater than the original rating. If the voltage rating is not known, use 370 volt capacitors on 115 volt units and 440 volt capacitors on 230 volt units. Table 3-6 lists useful information regarding capacitors. Table 3-5: Limits for Run Capacitor Ratings Specific Rating Maximum Addition 10 to 20 MFD + 2 ½ MFD 20 to 50 MFD + 5 MFD Over 50 MFD + 10 MFD Table 3-6: Facts about Capacitors Capacitor Type Compressor Motor Type Characteristics Start Capacitor CSIR and CSR • Designed to operate for only a few seconds during start • Taken out of start winding circuit by relay • Excessive start capacitor MFD increases start winding current, increases start winding temperature, and may reduce start torque • Capacitors in CSR motors should have 15,000 ohm, 2 watt bleed resistor across terminals • Capacitor rated voltage must be equal to or more than that specified • Capacitor MFD should not be more than that specified Table 3-5: Facts about Capacitors continued on next page
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
Page 21: 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 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 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 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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