Friedrich R-410A service manual Problem Possible Cause Possible Solution

Page 63

COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS

Problem

Possible Cause

Possible Solution

 

Sublimation:

Ensure that foam gaskets are installed in

 

When unconditioned saturated,

between window panes & in between the

 

outside air mixes with conditioned

unit & the sleeve. Also, ensure that fresh

 

air, condensation forms on the

air/exhaust vents (on applicable models) are in

Water “spitting”

cooler surfaces

the closed position & are in tact

into room

Downward pitch of installation is

Follow installation instructions to ensure that

 

downward pitch of installed unit is no less than

 

too steep towards back of unit

 

1/4” & no more than 3/8”

 

 

 

Restricted coil or dirty filter

Clean & advise customer of periodic cleaning

 

& maintenance needs of entire unit

 

 

Problem

Possible Cause

Possible Solution

 

Insufficient air circulation thru area

Adjust louvers for best possible air circulation

 

to be air conditioned

Excessive

 

Oversized unit

Operate in “MoneySaver” position

moisture

Inadequate vapor barrier in building

Advise customer

 

 

structure, particularly floors

 

 

Problem

Possible Cause

Possible Solution

 

Defective thermistor

Replace thermistor or electronic control board

 

Unit oversized

See sizing chart. Correct as needed.

Unit

Chassis seal gasket not sealing or

Check gasket. Reposition or replace as

short cycles

absent causting unit to short cycle

needed

 

 

 

 

 

Restricted coil or dirty filter

Clean & advise customer of periodic cleaning

 

& maintenance needs of entire unit

 

 

Problem

Possible Cause

Possible Solution

 

Defective indoor ambient thermistor

Check alarms. Replace thermistor or electronic

Prolonged off

or electronic control board

control board

 

 

cycles

 

 

Defective remote wall t-stat

Replace t-stat

 

 

 

 

Problem

Possible Cause

Possible Solution

 

Evaporator drain pan cracked or

Repair, clean or replace as required

 

obstructed

 

 

 

Water in compressor area

Detach shroud from pan & coil. Clean &

Outside water

remove old sealer. Reseal, reinstall & check

 

leaks

Obstructed condenser coil

Use pressure wash or biodegradable cleaning

 

agent to clean

 

 

 

Fan blade/slinger ring improperly

Adjust fan blade to 1/2” of condenser coil fin

 

positioned

pack

62

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Contents Heat Pump Volt YS10M10 Cool OnlyCool with Electric Heat Heat Pump with Electric HeatTable 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 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 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 Capacitor Connections Components TestingCapacitors Capacitor Check with Capacitor AnalyzerDrain PAN Valve Testing the Heating Element Electric Shock HazardHeating Element Heating Element Heat Pump ModelsRefrigeration Sequence of Operation Refrigeration system under high pressure 410A Sealed System Repair ConsiderationsRisk of Electric Shock 410A Sealed Refrigeration System RepairsEquipment Required Equipment Must be CapableMethod Of Charging / Repairs Burn HazardFreeze Hazard Overcharged Refrigerant Systems Undercharged Refrigerant SystemsRestricted Refrigerant System Capillary Tube Systems Hermetic Components CheckMetering Device Check ValveReversing 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 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 TipsHeat Pump Room AIR Conditioners Trouble Shooting Tips Troubleshooting Chart Heat PumpProblem Possible Cause Action YES Electrical Troubleshooting Chart Heat PumpSystem Cools When Heating is Desired Heat PumpMalfunction 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 Cooling Load Estimate Form Heat Gain from Quantity FactorsDAY Heat Load Form Following is an example using the 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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