Friedrich R-410A service manual Cooling only Room AIR Conditioners Troubleshooting Tips

Page 60

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Problem

Possible Cause

Possible Solution

 

Low voltage

Check voltage at compressor. 115V & 230V

 

units will operate at 10% voltage variance

 

 

 

Temperature not set cold enough or

Set temperature to lower than ambient position.

 

room air thermistor inoperative

Test thermistor and replace if inoperative.

 

 

 

Compressor

Compressor hums but cuts off on

Hard start compressor. Direct test compressor.

overload

If compressor starts, add starting components

does not run

Open or shorted compressor

Check for continuity & resistance

 

 

windings

 

 

 

Open overload

Test overload protector & replace if inoperative

 

Open capacitor

Test capacitor & replace if inoperative

 

Inoperative system button

Test for continuity in all positions. Replace if

 

inoperative switch or electronic board.

 

 

 

Broken, loose or incorrect wiring

Refer to appropriate wiring diagrams to check

 

wiring. Correct as needed.

 

 

Problem

Possible Cause

Possible Solution

 

Inoperative system button

Test button & replace user interface if inoperative

 

Broken, loose or incorrect wiring

Refer to applicable wiring diagram

Fan motor

Open capacitor

Test capacitor & replace if inoperative

does not run

Fan speed button defective

Replace user interface if inoperative

 

Inoperative fan motor

Test fan motor & replace if inoperative (be sure

 

internal overload has had time to reset)

 

 

Problem

Possible Cause

Possible Solution

 

Undersized unit

Refer to industry standard sizing chart

 

Indoor ambient thermistor open

See alarms and replace thermistor if needed.

 

or shorted

 

 

 

Dirty filter

Clean as recommended in Owner’s Manual

 

Dirty or restricted condenser or

Use pressure wash or biodegradable cleaning

Does not cool or

evaporator coil

agent to clean

only cools slightly

Poor air circulation

Adjust discharge louvers. Use high fan speed

 

Fresh air or exhaust air door open

Close doors. Instruct customer on use of this

 

feature

 

 

 

Low capacity - undercharge

Check for leak & make repair

 

Compressor not pumping properly

Check amperage draw against nameplate. If

 

not conclusive, make pressure test

 

 

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Contents Cool Only Cool with Electric HeatHeat Pump with Electric Heat Heat Pump Volt YS10M10Table Of Contents Important Safety Information Your safety and the safety of others are very importantRefrigeration System Repair Hazards Property Damage Hazards Introduction Model and Serial Number LocationUnit Identification Specifications Performance DataInstallation Information / Sleeve Dimensions Electrical Data Electric Shock HazardFire Hazard Make sure the wiring is adequate for your unit Control Panel Operation Special Functions System Exit Back FAN Mode Speed Display Schedule Enter Digital Control Panels Access Codes Summary Key Sequence ActionRemote Control Operation Remote Control Operation Electronic Control System Maintenance IntroductionElectronic Control System Maintenance Operation Test mode Bypasses Following functions Can be TestedTo Clear Error Codes’ History Factory USE onlyUnit Operation Front PanelCOOL-HEAT SET Points System Set Point Mapping FigureElectronic Control Sequence of Operation Compressor OperationHeating Mode Control Operation Heat Control Heat Pump OnlyHeat Pump With Electric Heat Operation ConditionElectric Heat Operation in Cool with Electric Heat Units Compressor Lock Out Time Fan Mapping During Heat Mode Unit Operation with a WALL-STATRemoving the Front Cover Replacing the Indoor Coil Thermistor Swing OutConnecting a Remote Wall Thermostat Remote Wall Thermostat Location Components Testing CapacitorsCapacitor Check with Capacitor Analyzer Capacitor ConnectionsTesting the Heating Element Electric Shock Hazard Heating ElementHeating Element Heat Pump Models Drain PAN ValveRefrigeration Sequence of Operation 410A Sealed System Repair Considerations Refrigeration system under high pressure410A Sealed Refrigeration System Repairs Equipment RequiredEquipment Must be Capable Risk of Electric ShockMethod Of Charging / Repairs Burn HazardFreeze Hazard Undercharged Refrigerant Systems Overcharged Refrigerant SystemsRestricted Refrigerant System Hermetic Components Check Metering DeviceCheck Valve Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Testing the Reversing Valve Solenoid Coil Reversing Valve in Heating ModeChecking the Reversing Valve Procedure For Changing Reversing Valve Touch Test in Heating/Cooling CycleExplosion Hazard Compressor Checks Single Phase Resistance Test Ground TestChecking Compressor Efficiency Compressor Replacement Recommended procedure for compressor replacementHigh Temperatures High Pressure Hazard Routine Maintenance Sleeve / Drain Decorative Front CoverClearances Standard Filter Cleaning Installation Instructions Control Panel Battery Change Procedure Battery type Lithium, 3 Volts, #CR2450Service and Assistance Room AIR Conditioner Unit Performance Test Data Sheet Error Codes and Alarm Status IconTroubleshooting Tips Problem Possible Cause Possible SolutionTroubleshooting Tips Cooling only Room AIR Conditioners Troubleshooting Tips Problem Possible Cause Possible SolutionReplace fuse, reset breaker. If repeats, check Possible Cause Possible Solution Problem Possible Cause Possible Solution Heat / Cool only Room AIR Conditioners Troubleshooting Tips Bad outdoor coil thermistor Replace thermistorHeat Pump Room AIR Conditioners Trouble Shooting Tips Troubleshooting Chart Heat PumpProblem Possible Cause Action Electrical Troubleshooting Chart Heat Pump System Cools When Heating is DesiredHeat Pump YESNormal Function of Valve Malfunction of ValveElectronic Control Board Components Identification DischargeRemote Wall Thermostat Wiring Diagrams Cool W/O Electric HeatSchematic Kuhl Electronic Control Cool only ModelsSL28M30A, SL36M30A KUHL+ Electronic Control Cool with Electric Heat Models ES12M33A, ES15M33A EM18M34A, EM24M34AKUHL+ Electronic Control Cool with Electric Heat Model EL36M35AKUHL+ Electronic Control Heat Pump only Model YS10M10AHeat KUHL+ Electronic Control Heat Pump with Electric Heat Model YL24M35ATHERMISTORS’ Resistance Values This Table Applies to All ThermistorsReplacement Remote Control Configuration Instructions Checking the Remote Control’s OPT # Code Replacement Instructions Aham PUB. NO. RAC-1 Cooling Load Estimate Form Heat Gain from Quantity FactorsDAY Following is an example using the heat load form Heat Load FormHeating Load Form Friedrich Room Unit Heat Pumps Windows & Doors Area, sq. ftInfiltration Windows & Doors AVG 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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