Hermetic Compressor - Tecumseh

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16 SERVICE HANDBOOK Single-phase Compressor Motor Types Tecumseh hermetic compressors contain motors designed Compressor for - Unit specific requirements of starting Ground torque and running efficiency. There are four general types of single-phase motors, R each distinctly different from the others. Each type of motor may have two to four different PTC configurations Relay depending on the compressor components. Resistance Start — Induction Run (RSIR) This motor, also known as a splitphase motor, is used on many small hermetic compressors up through 1/3 HP. The motor has low starting torque and must be applied to Line 1 complete self-equalizing capillary Line 1 tube systems such as household Line 2 refrigerators, freezers, small water coolers, and dehumidifiers. This Line 2 motor has a high resistance start Ground winding which is not designed Ground to remain in the circuit after the motor has come up to speed (see Figure 3-1). A relay is necessary to perform the function of disconnecting the start winding as the motor comes up to design speed. Three types of relays are used with this motor: • a current relay, • a wired-in Positive Temperature Coefficient (PTC) relay (see Figure 3-2), or • a module Positive Temperature Coefficient (PTC) relay. Capacitor Start — Induction Run (CSIR) The CSIR motor is similar to RSIR except a start capacitor is included in series with start winding to produce a higher starting torque (see Figure 3-3). This is commonly used on commercial refrigeration systems through ¾ HP. Two types of relays are used with this motor: • a current relay, or • a potential relay. Capacitor Start and Run (CSR) This motor arrangement uses a start capacitor and a run capacitor in parallel with each other and in series with the motor start winding (see Figure 3-4). This motor has high starting torque, runs efficiently, and is used on many refrigeration and air conditioning applications through 5 HP. A Line 1 Line 2 (115 Volt Only - Neutral) Ground Control Alt. 3/4" Thermal Protector Control 4 T M Thermal Protector Control Identified Conductor (115 Volt Only - Neutral) (115 Volt Only - Neutral) Compressor - Unit Ground Compressor - Unit Ground FIGURE 3-1: Ground Line 2 Ground (115 Compressor Volt Only - Neutral) - Unit Ground Ground Compressor - Unit Compressor Ground - Unit Ground FIGURE 3-2: FIGURE 3-3: External Thermal Protector C C Relay - Current RSIR motor diagram with current relay External Thermal Alt. 3/4" Thermal Control Protector External Protector Thermal C Protector Control Line 1 C 4 T M Thermal Protector Line 1 Control Relay - CurrentC Line 2 Relay - Current S (115 Start Volt Capacitor Only - Neutral) S Line 2 S Line 1 Control Control Line Alt. 3/4" 1 Thermal Protector 4 T M Thermal Protector Start Capacitor 1 Control Line 2 Line (1152Volt Only - Neutral) Line 2 Identified Conductor (115 Volt Only - Neutral) Ground Ground Compressor - Unit - Unit Compressor Ground - Unit Ground RSIR motor diagram with wired-in PTC relay C S S R R R CSIR motor diagram S Relay - Current Relay Current Start Winding Star t Winding Start Winding Start Winding Start Star Winding t Winding Main Winding R PTC Relay External Thermal External Protector Thermal Protector C C S Star t Winding Main Winding R PTC Relay R PTC Relay S R Start Winding Main Winding Main Winding Main Winding Main Main Winding Winding Main Winding External Thermal Protector External Thermal
17 potential relay removes the start capacitor from the circuit after the motor is up to speed. This motor may use either: • an external thermal protector, or • an internal thermal protector. Permanent Split Capacitor (PSC) Here a run capacitor is in series with the start winding. Both run capacitor and start winding remain in the circuit during start and after motor is up to speed (see Figure 3-5). This normal starting torque motor is sufficient for capillary and other self-equalizing system. No start capacitor or relay is necessary. For additional starting torque, a proper start assist kit may be added (see Figure 3-6). Some start assist kits may include: • a wired-in Positive Temperature Coefficient (PTC) relay, or • a module Positive Temperature Coefficient (PTC) relay. This motor may use either: • an external thermal protector, or • an internal thermal protector. PSC motors are basically air conditioning compressor motors and are very common up through 5 HP. PSC Motor Starting Tecumseh Products Company pioneered the development of Permanent Split Capacitor compressor motors. This type of motor eliminates the need for potentially troublesome and costly extra electrical components, e.g., start capacitors and potential motor starting relays (see Figure 3-5). To fully realize the capabilities of this simplified type of compressor motor, it is necessary to understand its starting and operating characteristics and the field conditions that can affect it. The following conditions affect PSC motor starting: • Low voltage: Reduces motor starting and running torque. A 10% voltage drop reduces a motor’s starting ability by 19%. Low voltage can cause no start, hard start, light flicker, and TV screen flip flop. Line 1 Line 2 Ground Control Compressor - Unit Ground FIGURE 3-4: FIGURE 3-5: FIGURE Line 1 3-6: Line 2 Control Ground Compressor - Unit Ground Control Line 1 Relay - Potential External or Internal Thermal Protector CSR motor diagram Start Winding Main Winding External or Internal Thermal Protector Line 1 Control C Line 2 S Ground Compressor - External R or Internal Unit Ground Thermal Protector Run Capacitor Control Line 1 C Line 2 PSC motor diagram S Ground Compressor - R Unit Ground Thermal Protector Line 1 C Run Capacitor Plug-In C Run Capacitor C2 S PTC Relay (115 Volt Only - Neutral) (115 Volt Only - Neutral) C1 Line 2 N Line 1 C Ground Plug-In Run Compressor Capacitor - Unit Ground C2 (115 Volt Only - Neutral) Line 2 N Ground Compressor - Unit Ground (115 Volt Only - Neutral) Line 2 C1 Thermal Protector PTC Starting and Protector Package PSC motor diagram C with start assist Relay kit -that includes a module PTC Potential relay C S R PTC Starting and Protector Package External or Internal Thermal Protector Relay - Potential PTC Relay Start Winding External or Internal Thermal Protector S RC R C S R inding Start Winding Start Winding Main Winding Main Winding Start Winding Main Winding Start Winding Main Winding Main Winding ding
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 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 75 and 76:
67 Step 1: Before Continuing with T
Page 77 and 78:
69 Step 1: Before Continuing with T
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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Hermetic Compressor - Tecumseh

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