Friedrich R-410A service manual Undercharged Refrigerant Systems, Overcharged Refrigerant Systems

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WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation.

Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

Undercharged Refrigerant Systems

A check of the amperage drawn by the compressor

An undercharged system will result in poor performance

motor should show a lower reading. (Check the Unit

(low pressures, etc.) in both the heating and cooling

Specification.) After the unit has run 10 to 15 minutes,

cycle.

check the gauge pressures. Gauges connected to system

Whenever you service a unit with an undercharge of

with an undercharge will have low head pressures and

substantially low suction pressures.

refrigerant, always suspect a leak. The leak must be

 

 

 

repaired before charging the unit.

 

 

 

 

 

 

To check for an undercharged system, turn the unit on,

 

 

 

allow the compressor to run long enough to establish

 

 

 

working pressures in the system (15 to 20 minutes).

 

 

 

During the cooling cycle you can listen carefully at the exit

 

 

 

of the metering device into the evaporator; an intermittent

 

 

 

hissing and gurgling sound indicates a low refrigerant

 

 

 

charge. Intermittent frosting and thawing of the evaporator

 

 

 

is another indication of a low charge, however, frosting

 

 

 

and thawing can also be caused by insufficient air over

 

 

 

the evaporator.

 

 

 

Checks for an undercharged system can be made at

 

 

 

 

 

 

the compressor. If the compressor seems quieter than

 

 

 

normal, it is an indication of a low refrigerant charge.

 

 

 

Overcharged Refrigerant Systems

of the evaporator will not be encountered because the

Compressor amps will be near normal or higher.

refrigerant will boil later if at all. Gauges connected to

system will usually have higher head pressure (depending

Noncondensables can also cause these symptoms. To

upon amount of over charge). Suction pressure should be

confirm, remove some of the charge, if conditions improve,

slightly higher.

system may be overcharged. If conditions don’t improve,

 

 

 

Noncondensables are indicated.

 

 

 

Whenever an overcharged system is indicated, always

 

 

 

make sure that the problem is not caused by air flow

 

 

 

problems. Improper air flow over the evaporator coil may

 

 

 

indicate some of the same symptoms as an over charged

 

 

 

system.

 

 

 

An overcharge can cause the compressor to fail, since it

 

 

 

would be “slugged” with liquid refrigerant.

 

 

 

The charge for any system is critical. When the compressor

 

 

 

is noisy, suspect an overcharge, when you are sure that

 

 

 

the air quantity over the evaporator coil is correct. Icing

 

 

 

 

 

 

 

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Contents Cool with Electric Heat Cool OnlyHeat Pump with Electric Heat Heat Pump Volt YS10M10Table Of Contents Your safety and the safety of others are very important Important Safety InformationRefrigeration System Repair Hazards Property Damage Hazards Model and Serial Number Location IntroductionUnit Identification Performance Data SpecificationsInstallation Information / Sleeve Dimensions Fire Hazard Electrical DataElectric Shock Hazard Make sure the wiring is adequate for your unit Control Panel Operation Special Functions System Exit Back FAN Mode Speed Display Schedule Enter Key Sequence Action Digital Control Panels Access Codes SummaryRemote Control Operation Remote Control Operation Introduction Electronic Control System MaintenanceElectronic Control System Maintenance Operation Following functions Can be Tested Test mode BypassesFactory USE only To Clear Error Codes’ HistoryFront Panel Unit OperationSystem Set Point Mapping Figure COOL-HEAT SET PointsCompressor Operation Electronic Control Sequence of OperationHeat Control Heat Pump Only Heating Mode Control OperationCondition Heat Pump With Electric Heat OperationElectric Heat Operation in Cool with Electric Heat Units Compressor Lock Out Time Fan Mapping Unit Operation with a WALL-STAT During Heat ModeRemoving the Front Cover Swing Out Replacing the Indoor Coil ThermistorConnecting a Remote Wall Thermostat Remote Wall Thermostat Location Capacitors Components TestingCapacitor Check with Capacitor Analyzer Capacitor ConnectionsHeating Element Testing the Heating Element Electric Shock HazardHeating Element Heat Pump Models Drain PAN ValveRefrigeration Sequence of Operation Refrigeration system under high pressure 410A Sealed System Repair ConsiderationsEquipment Required 410A Sealed Refrigeration System RepairsEquipment Must be Capable Risk of Electric ShockFreeze Hazard Method Of Charging / RepairsBurn Hazard Overcharged Refrigerant Systems Undercharged Refrigerant SystemsRestricted Refrigerant System Metering Device Hermetic Components CheckCheck Valve Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Checking the Reversing Valve Testing the Reversing Valve Solenoid CoilReversing Valve in Heating Mode Explosion Hazard Procedure For Changing Reversing ValveTouch Test in Heating/Cooling Cycle Compressor Checks Checking Compressor Efficiency Single Phase Resistance TestGround Test High Temperatures Compressor ReplacementRecommended procedure for compressor replacement High Pressure Hazard Routine Maintenance Clearances Sleeve / DrainDecorative Front Cover Standard Filter Cleaning Installation Instructions Battery type Lithium, 3 Volts, #CR2450 Control Panel Battery Change ProcedureService and Assistance Room AIR Conditioner Unit Performance Test Data Sheet Icon Error Codes and Alarm StatusProblem Possible Cause Possible Solution Troubleshooting TipsTroubleshooting Tips Problem Possible Cause Possible Solution Cooling only Room AIR Conditioners Troubleshooting TipsReplace fuse, reset breaker. If repeats, check Possible Cause Possible Solution Problem Possible Cause Possible Solution Bad outdoor coil thermistor Replace thermistor Heat / Cool only Room AIR Conditioners Troubleshooting TipsProblem Possible Cause Action Heat Pump Room AIR Conditioners Trouble Shooting TipsTroubleshooting Chart Heat Pump System Cools When Heating is Desired Electrical Troubleshooting Chart Heat PumpHeat Pump YESMalfunction of Valve Normal Function of ValveDischarge Electronic Control Board Components IdentificationCool W/O Electric Heat Remote Wall Thermostat Wiring DiagramsKuhl Electronic Control Cool only Models SchematicSL28M30A, SL36M30A ES12M33A, ES15M33A EM18M34A, EM24M34A KUHL+ Electronic Control Cool with Electric Heat ModelsEL36M35A KUHL+ Electronic Control Cool with Electric Heat ModelYS10M10A KUHL+ Electronic Control Heat Pump only ModelHeat YL24M35A KUHL+ Electronic Control Heat Pump with Electric Heat ModelThis Table Applies to All Thermistors THERMISTORS’ Resistance ValuesReplacement Remote Control Configuration Instructions Checking the Remote Control’s OPT # Code Replacement Instructions Aham PUB. NO. RAC-1 DAY Cooling Load Estimate FormHeat Gain from Quantity Factors Heat Load Form Following is an example using the heat load formInfiltration Windows & Doors AVG Heating Load Form Friedrich Room Unit Heat PumpsWindows & Doors Area, sq. ft Room AIR Conditioners Limited Warranty Technical Support Contact Information Friedrich AIR Conditioning CO
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R-410A specifications

Friedrich R-410A is an advanced refrigerant widely used in HVAC (Heating, Ventilation, and Air Conditioning) systems, known for its high efficiency and environmental friendliness. As a hydrofluorocarbon (HFC) blend, R-410A has become the preferred alternative to R-22, which is being phased out due to its ozone-depleting potential. One of the main features of R-410A is its high latent heat of vaporization, which allows for efficient heat transfer and improved cooling performance in air conditioning units.

Technologically, R-410A operates at higher pressures than older refrigerants, meaning systems designed for R-410A need to be built with more robust components to safely handle these pressures. This results in a more compact system design that offers enhanced performance and reliability. The dual-component nature of R-410A—composed of difluoromethane (R-32) and pentafluoroethane (R-125)—provides an optimal balance of thermodynamic properties, leading to superior energy efficiency, especially in variable speed applications.

In terms of characteristics, R-410A has a higher cooling capacity, which enables HVAC systems to effectively cool larger spaces or run more efficiently when cooling smaller areas. The refrigerant is non-toxic and non-flammable, which enhances safety during its use. In addition, R-410A has a lower global warming potential relative to other refrigerants, making it a more environmentally responsible choice for modern cooling systems.

Moreover, R-410A systems typically require less refrigerant charge due to their efficiency, contributing to reduced greenhouse gas emissions. The adoption of R-410A aligns with regulatory trends aimed at minimizing the environmental impact of refrigerants in cooling applications.

Overall, the Friedrich R-410A refrigerant embodies a combination of technology and environmental stewardship, making it a cornerstone of contemporary HVAC design. Its ability to provide effective and energy-efficient cooling solutions while being compliant with modern environmental regulations positions R-410A as the refrigerant of choice for engineers and installers focused on sustainability and performance in air conditioning systems.
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