Refrigeration Manual - HVAC and Refrigeration Information Links

Part IIREFRIGERATION SYSTEM COMPONENTSSection 4. COMPRESSORSReciprocating Compressors.............................. 4-1Open Type Compressors.................................. 4-2Accessible-Hermetic Motor-Compressors........ 4-2Welded Hermetic Motor-Compressors.............. 4-2Compressor Speed........................................... 4-2Basic Compressor Operation............................ 4-4Suction and Discharge Valves.......................... 4-4Compressor Displacement................................ 4-4Clearance Volume............................................. 4-4Lubrication........................................................ 4-5Dry Air Holding Charge..................................... 4-6Compressor Cooling......................................... 4-6Compressor Capacity....................................... 4-6Two Stage Compressors................................... 4-6Compressors with Unloaders .......................... 4-7Tandem Compressors....................................... 4-7Section 5. CONDENSERSAir Cooled Condensers..................................... 5-1Water Cooled Condensers................................ 5-2Evaporative Condensers................................... 5-4Condenser Capacity......................................... 5-5Condensing Temperature.................................. 5-5Non-Condensable Gases.................................. 5-5Condensing Temperature Difference................ 5-6Section 6. EVAPORATORSTypes of Evaporators........................................ 6-1Blower Coil Construction................................... 6-1Pressure Drop and Other Factorsin Evaporator Design................................. 6-2Evaporator Capacity......................................... 6-2Temperature Difference andDehumidification........................................ 6-2Defrosting of Blower Coils................................. 6-3Section 7. CONTROL DEVICES, REFRIGERANTThermostatic Expansion Valves........................ 7- 1Other Types of Expansion Valves..................... 7- 2Distributors........................................................ 7- 2Capillary Tubes................................................. 7- 2Float Valves....................................................... 7- 8Solenoid Valves................................................. 7- 8Crankcase Pressure Regulating Valves............ 7- 9Evaporator Pressure Regulating Valve............. 7- 9Hot Gas Bypass Valves..................................... 7- 9Reversing Valves.............................................. 7-10Check Valves.................................................... 7-10Manual Shut-Off Valves.................................... 7-11Compressor Service Valves.............................. 7-11Schrader Type Valve......................................... 7-11Pressure Relief Valves...................................... 7-12Fusible Plugs.................................................... 7-12Water Regulating Valves................................... 7-12Section 8. CONTROL DEVICES, ELECTRICALControl Differential............................................ 8-1Line Voltage and Low Voltage Controls............ 8-1Low Pressure and High Pressure Controls....... 8-1Condenser Fan Cycling Control........................ 8-2Thermostats...................................................... 8-2Oil Pressure Safety Control.............................. 8-2Time Clocks...................................................... 8-2Relays............................................................... 8-3Time Delay Relay.............................................. 8-3Transformers..................................................... 8-31© 1967 Emerson Climate Technologies, Inc.All rights reserved.