Friedrich R-410A service manual Digital Control Panels Access Codes Summary, Key Sequence Action

Page 15

SYSTEM

EXIT

BACK

FAN

MODE

FAN

SPEED

DISPLAY

SCHEDULE

ENTER

User presses or to select between Freeze Protection On

&Freeze Protection Off. Press the key to accept the change and exit the selection process.

Freeze Protection – The Kühl+ models have a special feature that is designed to keep the interior space above freezing by energizing the electric heater anytime the indoor room temperature falls to 40° F (4° C). With the freeze protection feature turned on, when the unit senses the indoor temperature fall to 40° F (4° C) the unit will run the heater and high fan until the space reaches 46° F (8° C) When FRZ is displayed press

the key then press (UP) or (DOWN) to toggle between ON

and OFF. To accept the change, press the key to return to the FRZ

screen. Press the (UP) to go to the next menu TO.

SYSTEM

EXIT

BACK

FAN

MODE

FAN

SPEED

DISPLAY

SCHEDULE

ENTER

User presses or to increment/decrement the temperature offset (TO) for the room temperature sensor. (Maximum offset

=+/- 8 degrees F). Press the key to accept the change and exit the selection process

Temperature Offset – In some cases the built in thermostat on the unit may not display the temperature as it is felt in the room. This can be caused by many things including the size of the unit, the heat load on the room or other factors. Friedrich allows you to select the appropriate temperature offset to make the temperature readout as accurate as possible for your application. In many cases the factory 0° F (-18° C) offset will provide an accurate temperature readout. To change the offset follow these

instructions. When TO is displayed press the key then press

(UP) or (DOWN) to toggle between 0° F (-18° C) and 8° F (-13° C). In most instances an offset from 0° F (-18° C) to 2° F (-17° C) is all that is

necessary. To accept the change, press the key to return to the TO

screen. Press the (UP) to go to the next menu ATSF.

You may cycle through the menus using the (UP) or (DOWN) keys to access any of the menus.

F

Y

R

User presses or to select between ATSF On or Off.

Press the key to accept the change and exit the selection process.

Automatic Temperature Sampling Feature - The automatic temperature sampling feature maintains a balanced temperature throughout the room by circulating the air for 30 seconds once every 9 minutes that the unit is not running when it is set to cooling or heating mode. By circulating the air the unit can detect hot or cold areas in the room and operate the unit to cool or warm the room as necessary. This function is only available when the fan mode is set to ‘AUTO’ or in COOL or HEAT Mode. (Heating function only available on Kuhl+ units)

Y

For display only. No user selectable options.

Firmware Version - When VER is displayed press Display / Enter key. The firmware version is displayed as left digit (Major) and right digit (Minor). This version number should be used along with Model and Serial numbers for service.

DIGITAL CONTROL PANEL'S ACCESS CODES SUMMARY

14

Key Sequence

 

Action

Filter Reset

Press BACK key for 3 sec + play double beep ()

Enter User Menu

 

PressDISPLAY/ENTER key for 3 sec + play double beep ()

Enter Maintenance Menu

 

Press SYSTEM + SCHEDULE + BACK + DISPLAY/ ENTER for 3 sec + play double beep ()

Schedule ON/OFF

Press SCHEDULE once each time

Enter & Exit Schedule Programming

Press SCHEDULE for 3 sec + play double beep ()

Reset Error Codes & Error History

Press + for 3 sec + play double beep ()

Lock Control Panel

Press SCHEDULE + DISPLAY/ENTER for 3 sec + play double beep ()

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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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