Friedrich R-410A service manual Control Panel Operation

Page 12

Control Panel Operation

Let’s check out how to control your air conditioner. On the control panel, just to the left of the POWER , is a liquid crystal display (LCD). All of the control panel function buttons and mode icons can be viewed in Figure 1.

Power On – Press the button to turn on the air conditioner. The power button will illuminate to indicate the power is on. The backlight on the power switch will automatically dim to 20% intensity after 120 seconds of inactivity. The remote control can also be used to turn power ON / OFF (See Remote Control).

Display – light. The back light has an automatic two (2) step dim function. After 120 seconds of inactivity, the display dims to 20% intensity. After an additional 120 seconds, the display switches off. Touching buttons will automatically bring the display to full brightness.

There are four control push buttons on each side of the display.

SYSTEM Button – Allows the user to sequentially select, Cool

, HEAT , and FAN ONLY operation. Press the button and the display advances to the next mode. A new icon appears. At the same time, the mode displays for two (2) seconds, then returns the display to the temperature set point for modes other than FAN. Note that on cool

only units, there are no HEAT and modes.

FAN MODE Button – Selects between automatic or

operation. In the mode, the fan only turns on and off when the compressor operates or the heat function is enabled.

In the SYSTEM FAN ONLY Mode, is not available. In the

mode, fans speed is determined by your selection on the button.

Figure 1

FAN SPEED Button – Used to sequentially select between fan speeds. Depending on your model, you can select between LOW, MED, HIGH, and MAX and AUTO. Max setting not available on SL and Kuhl+ models.

When the button is pressed, the fan speed is temporarily displayed in the display window, plus a fan speed icon (triangle) changes to indicate the new speed level. When auto is selected, fan speed automatically varies depending on the set temperature on the control panel and the actual room temperature. Let me explain. Say for example you’re working in your garage and you need to open the big door for several minutes. The air conditioner will sense a wide difference between the set temperature and the actual room temperature when this occurs the system fan speed increases to MAX. The fan speed decreases (in step) as the temperature difference decreases. When the set point temperature is reached the FAN speed returns to the original setting.

SCHEDULE Button – The button turns the schedule function on and off. The current day of the week is indicated as a dot underneath

the day symbol. Pressing the button a second time turns the schedule function off. The schedule function comes preprogrammed with recommended energy savings values (Addendum 1). The values may be changed through the schedule program function (See Programmable Thermostat).

UP and DOWN arrows – Pressing either (UP) or (DOWN) button changes the desired room temperature. The factory preset lower and upper limits are 63° F (16° C) and 99° F (37° C). These buttons are also used to navigate between function options when using the User Menu or Maintenance Mode.

BACK Button – This button is used after a menu item has been selected. It takes the user back to the previous menu level and to save and exit.

DISPLAY/ENTER Button – This button is used in conjunction with User Menu and Maintenance Mode operation to select items. This button may also be used to alternatively display the ROOM TEMPERATURE, OUTDOOR TEMPERATURE, and TIME. If the display is left inactive for 10 seconds it will reset to the TEMPERATURE SET POINT.

AUTO

COOL

HEAT

 

FAN

 

 

MAINTENANCE

FRONT

FILTER

 

 

 

ONLY

 

 

PANE L

 

 

MODE

MODE

MODE

 

MODE

 

REQUIRED

LOCK

MAINTENANCE

WAIT

 

SYSTEM

 

 

AU TO

 

 

 

 

 

 

CHECK

ON

EXIT

BACK

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FI LT ER

OFF

RESET

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FA N

 

 

AU TO

 

 

 

 

OUTDOOR

TEMP

 

 

 

 

 

 

 

 

 

 

 

ROOM TEMP

HE AT -> SET POINT

<- COOL

 

 

MODE

 

 

 

 

 

 

 

 

 

 

 

CONTINUOUS

 

 

 

 

 

 

 

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A

 

 

FA N

 

 

AU TO

 

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

P

 

 

SPEED

 

 

 

 

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M T

W

T F

S

S

 

 

 

 

C

 

 

SCHEDULE

 

WAKE

AWAY

R E T URN

NIGHT

DISPLAY

POWER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENTER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BUTTONS

SCHEDULE

 

 

 

 

 

SCHEDULE

 

 

BUTTONS

 

 

 

ON/OFF

 

 

 

 

 

 

PERIODS

 

 

 

 

11

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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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