Friedrich racservmn service manual Restricted Refrigerant System

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Restricted Refrigerant System

A quick check for either condition begins at the evaporator. With a partial restriction, there may be gurgling sounds at the metering device entrance to the evaporator. The evaporator in a partial restriction could be partially frosted or have an ice ball close to the entrance of the metering device. Frost may continue on the suction line back to the compressor.

Often a partial restriction of any type can be found by feel, as there is a temperature difference from one side of the restriction to the other.

With a complete restriction, there will be no sound at the metering device entrance. An amperage check of the compressor with a partial restriction may show normal current when compared to the unit specification. With a complete restriction the current drawn may be considerably less than normal, as the compressor is running in a deep vacuum (no load.) Much of the area of the condenser will be relatively cool since most or all of the liquid refrigerant will be stored there. The following conditions are based primarily on a system in the cooling mode.

Troubleshooting a restricted refrigerant system can be difficult. The following procedures are the more common problems and solutions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions.

A partial restriction allows some of the refrigerant to circulate through the system.

With a complete restriction there is no circulation of refrigerant in the system.

Restricted refrigerant systems display the same symptoms as a "low-charge condition."

When the unit is shut off, the gauges may equalize very slowly.

Gauges connected to a completely restricted system will run in a deep vacuum. When the unit is shut off, the gauges will not equalize at all.

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Contents 2003 Table of Contents 1st Digit Function RAC Serial Number Identification Guide00001 Page Data Evaporator AIR Operating Electrical Breaker Pressures Ratings Refrig Fuse Performance Evaporator AIR Operating Electrical Breaker Data SS10J10AR-A TEMP. DEG. F Pressures Ratings SC06H10E HeatingWY09A33F-A WY12A33F-A Heating BtuhAmps Refrigeration System Sequence of Operation Fuse/Circuit Wire SizeBreaker GroundingThermal Overload External Winding TestChecking Compressor Efficiency Terminal Overload Internal Terminal Overload TestChecking the Internal Overload FAN MotorResistor System Control Panel KQ Models Only- See Figure System Control PanelEQ Model Only See Figure System Control Panel YQ Model Only System Control Switch Test System Control Switch WE & WY Models See FigureSystem Control Panel See Figure System Control Switch KS, SS, KM, SM, SL Models See FigureHeat Pump & Electric Heat Models See Figure System Control SwitchTo Adjust Temperature To SET Mode of OperationTo Adjust FAN Speed Smart Center Electronic Control CenterTesting the Electronic Control To SET the TimerTesting the Electronic Control Error Code Listings To SET Hour ClockThermostat SQ & KQ Models See Figure TestThermostat YQ Model Only See Figure Thermostat Models ES, YS, EM, YM, EL, YL See FigureThermostat Adjustment Defrost Thermostat Heat Pump Models OnlyThermostat Bulb Location Defrost Bulb Location Heat Pump Models Only CAPACITOR, RUN See FigureCapacitor Test Heat Pumps Reversing Valve See Figure Check Valve OperationTesting Reversing Valve Solenoid Coil Heat Pump Models Only See FigureTo Test Heating Element See Figure VALVE, Drain PAN See FigureSealed Refrigeration System Repairs Equipment RequiredSpecial Procedure in the Case Compressor Motor Burnout Hermetic Component ReplacementRotary Compressor Special Troubleshooting and Service Equipment Must be CapableMethod of Charging Undercharged Refrigerant SystemsOvercharged Refrigerant Systems Restricted Refrigerant System Routine Maintenance Troubleshooting Touch Test Chart To Service Reversing Valves Problem To Correct Troubleshooting CoolingProblem Possible Cause To Correct Cycles Problem Possible Cause To Correct Troubleshooting Heating Heat pumps Problem Possible Cause To Correct Off and the electric element is energized Troubleshooting Heating Cooling/Electric Models Troubleshooting Chart Cooling YES System Cools When Heating is DesiredModels SQ06J10B-B, SQ06J10B-A, SQ08J10C-A, SQ08J10D-A Models KQ08J10B-1, KQ08J10B-A, KQ08J10C-A Schematic YQ06J10B-A ModelModel SC06H10D 619-405-06 Alternate SL28J30B-A, SL35J30-A, SL35J30-BConductor Or Brown RED Blue To Capacitor Bracket Wiring Diagram YS12J33-A, YM18J34B-A, YL24J35C-A Model EQ08J11-A, EQ08J11-B IDT Ovld Neutral WE09A33E-B, WE12A33E-A, WE15A33-A WY09A33F-A, WY12A33G-A Checking Room Temperature Testing The Electronic Control XQ Boards & QME BoardsFriedrich AIR Conditioning CO

racservmn specifications

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