Hermetic Compressor - Tecumseh

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62 SERVICE HANDBOOK This PSC compressor has the following components: Thermal Protector Type Relay Type Capacitor Type Internal External Current Potential PTC Run Start √ √ The electrical system on this type of motor is shown in FIGURE 4-10. If replacement parts are needed, refer to the Tecumseh Electrical Service Parts Guide Book for information on proper replacement parts, or call Tecumseh Products Company at 1-800-211-3427. External Thermal Protector Line 1 Line 2 Ground Control C S Star t Winding Main Winding Compressor - Unit Ground R Run Capacitor FIGURE 4-10: PSC compressor motor with external thermal protector and run capacitor. FIGURE 4-11: PSC compressor motor with external thermal protector and a start assist kit that in cludes a potential relay.
63 Step 1: Before Continuing with Troubleshooting WARNING! All electric power should be disconnected and you should have already made sure that the compressor does not have a ground fault (see “Checking for a Ground Fault” on pages 40-41). You should have also checked the windings for continuity and proper resistance (see “Checking for Continuity and Proper Resistance” on page 42), made sure the system is getting proper voltage, and that the control, thermostat, and contactor are working properly. Step 2: Check Wiring Confirm that there is continuity between C and the protector common lead wire. Step 3: Check External Thermal Protector Check for continuity across the thermal protector (line 1 and compressor terminal connection). If there is no continuity then the thermal protector may be tripped. Wait for the protector to cool off and close. This may take more than an hour. Check continuity gain. If there is no continuity, replace the protector. Step 4: Check Run Capacitor CAUTION: using a 20,000 ohm resistor, discharge the capacitor before removing it from the system to avoid damage to measuring devices and risk of electric shock. Disconnect the run capacitor from the system. Use a capacitance meter to check capacitor. Capacitance should be 10% of the marked capacitor value. As an alternative, check the run capacitor by measuring continuity across the capacitor terminals: • Rx1 scale: If there is continuity, then the run capacitor is shorted and needs to be replaced. • Rx100,000 scale: If there is no needle deflection on an analog meter or if a digital meter indicates infinite resistance, then the run capacitor is open and needs to be replaced. Possible reasons that a run capacitor is not working properly include: • Use of incorrect run capacitor. Replace with proper run capacitor. • Line voltage is too high (greater than 100% of rated voltage). Step 5: Reconnect Run Capacitor Reconnect the run capacitor into circuit at terminals S and R. (Marked terminal should go to R.) Step 6: Add Start Assist Kit If the compressor checks out satisfactorily on all the above PSC tests but still doesn’t operate, add proper start assist kit to provide additional starting torque. See Figure 4-11 for proper wiring. Step 7: Continue Troubleshooting If all above tests prove satisfactory and unit still fails to operate properly, check for adequate compressor pumping as outlined in the procedure on page 70.
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 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: 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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