Friedrich Air Conditioner Troubleshooting Tips for Wall Units
Page 64

HEAT / COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Problem

Possible Cause

Possible Solution

 

Bad indoor ambient thermistor

Check error codes. Replace as needed.

Room temperature

 

 

Fan speed too low

Set at higher fan speed.

uneven

 

 

Opened door, windows, etc.

Close doors, windows, etc.

(Heating cycle)

 

ATSF (room air sampling feature) disabled

Enable ATSF

 

 

 

Problem

Possible Cause

Possible Solution

 

Bad outdoor coil thermistor

Replace thermistor.

 

 

 

Unit will not defrost

 

• On heat pumps with electric heat: no action needed

(Heat pump

 

• On model YSM10: do not operate below 32°F/ 0°C

only models)

Temperature below 32°F/ 0°C

• If outdoor air temp is higher than freezing, check

 

 

 

reversing valve, electric coil, outdoor thermistor,

 

 

refrigerant circuits, etc.

 

 

• For proper operation: correct as needed

 

 

 

Problem

Possible Cause

Possible Solution

 

Exhaust or fresh air door open

Check if operating properly. Instruct customer on

 

proper use of control

 

 

 

Dirty filter

Clean as recommended in Owner's Manual

 

 

Check heat rise across coil. If unit operates

 

Unit undersized

efficiently, check if insulation can be added

 

to attic or walls. If insulation is adequate,

Does not heat

 

 

recommend additional unit or larger one

adequately

 

 

 

Outdoor coil thermistor or electronic control

Check alarms (error codes). Replace thermistor

 

 

board defective

or electronic control board.

 

Heater hi-limit control cycling on & off

Check for adequate fan air across heater. Check

 

for open hi-limit control.

 

 

 

 

 

 

Shorted or open supplementary heater

Do ohmmeter check.

 

 

 

 

Incorrect wiring

Check applicable wiring diagram

 

 

 

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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 Electric Shock Hazard Electrical DataFire 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 ShockBurn Hazard Method Of Charging / RepairsFreeze Hazard Undercharged Refrigerant Systems Overcharged Refrigerant SystemsRestricted Refrigerant System Hermetic Components Check Metering DeviceCheck Valve Capillary Tube SystemsReversing Valve DESCRIPTION/OPERATION Reversing Valve in Heating Mode Testing the Reversing Valve Solenoid CoilChecking the Reversing Valve Touch Test in Heating/Cooling Cycle Procedure For Changing Reversing ValveExplosion Hazard Compressor Checks Ground Test Single Phase Resistance TestChecking Compressor Efficiency Recommended procedure for compressor replacement Compressor ReplacementHigh Temperatures High Pressure Hazard Routine Maintenance Decorative Front Cover Sleeve / DrainClearances 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 thermistorTroubleshooting Chart Heat Pump Heat Pump Room AIR Conditioners Trouble Shooting TipsProblem 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 Heat Gain from Quantity Factors Cooling Load Estimate FormDAY Following is an example using the heat load form Heat Load FormWindows & Doors Area, sq. ft Heating Load Form Friedrich Room Unit Heat PumpsInfiltration 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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