Fedders R407C service manual LED Board

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1.1.Operation / Filter Reset Button. Operation

By pushing this button, one of the following two air-con operations are selected.

a) AUTOMATIC operation

Selecting this operation is equivalent to selecting Auto mode,

 

auto fan speed control and auto vane function in manual

 

operation. The set temperature is internally fixed at 22°C and

 

cannot be changed.

 

This operation is useful when the hand held transmitter is lost

 

or faulty.

b) OFF operation

The air-con will be switched off. The hand-held transmitter will

 

not be able to control the operation of the Air-con.

Note that the ac. power supply is still connected to the receiver module of the electronic controller although the air-con is switched off.

This reset button selection is cyclic between AUTOMATIC – OFF.

Filter Reset

Whenever the Air-con is switched on, the air filter usage time will be monitored by the microcontroller. When the period of usage reaches 500 hours, the red LED on the LED board will light up to indicate that the air filter is dirty. The filter should then be removed and cleansed.

To extinguish the red LED after cleansing and replacing the filter, press and hold the Operation / Filter reset switch for 3 seconds. A beep sound will be heard after 3 seconds to indicate that the red LED has been extinguish.

1.2.RFI Filter

This is built into the main receiver board to remove RFI from the AC power supply. RFI filter could be removed provided that the EMC test result was satisfactory.

2.LED Board

Three LEDs on the board provide the following indications :

a) Power on/Defrost (green) LED

Lights up when power on.

 

It blinks at approximately 60 times per minute

 

during de-icing.

b) Timer activated (yellow) LED

Lights up upon activation of either one or both

 

of the START/STOP timers.

F4

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Contents Fedders Page Section a Specifications Container Loading Section B Parts List and Exploded Views Fedders Large Split AIR CONDITIONERR407C Service Parts List Model Number Fedders Refrigerant Assembly Packaging Parts Page Page Page R407C Refrigerant ASSEMBLYCont Packaging Parts Page Page Page Page Section C Installation Split Type AIR Conditioner Installation Manual Contents Safety Precaution Part Lists Cutting The Pipe And The Cables Pipe Length, Elevation and refrigerant chargeFlaring of pipe Removing burrsLocating the indoor unit Installing the wall bracket & drilling the piping holeRouting the drain hose and tubing Removing The Decorative FrontSealing The Drain Hose And Tubing Drain hose Use caution When bendingAttaching The Unit To The Wall Bracket Wiring The Indoor UnitConnecting The Piping To The Indoor Unit Locating the outdoor unit Outdoor Unit InstallationConnecting The Pipe To The Outdoor Unit Installing The Outdoor UnitConnecting The Wires To The Outdoor Unit Removing air from the tubing and indoor unit Checking for gas leakageRestraining the piping Test RUN & Check Switch On The Power SupplyChecking The Unit Upon completion of installing and checking the unitSection D Trouble Shooting Page Symptom Diagnosis Remedy Section E Wiring Diagram Page Page Page Page Section F Technical Data Large Split Unit 18 / 24K Applicable on Heat Pump Unit II. Hand-held TransmitterMain Receiver Board III. Receiver ModuleLED Board LED IV. Operations of the electronic controllerStep Modes of Operation Cool Mode CycleHeat Mode Heat Pump Unit only VII. Auto Fan Function VI. Temperature Control and MeasurementIndoor Fan Speed VIII. Vane Function IX. Sleep Function Cool or auto-cool modeON-OFF-ON Operation Timer FunctionXI. Device Protection Measures Heat mode protection applicable on Heat Pump Unit onlyHeat Mode Cycle 10C Indoor coil Temperature 2C Compressor Fan Min 10 min Defrosting in Heat mode applicable on Heat Pump Unit only Defrost Time Chart Heat Overload Protection Algorithm XII. Thermistor fault indicationXIII. Self Test XIV. Memory Backup of SettingsF21 F22 F23 F24 F25 F26 F27 F28

R407C specifications

Fedders R407C is a commonly used refrigerant that has made significant strides in the air conditioning and refrigeration industries. Developed as a replacement for R22, R407C blends three refrigerants: R32, R125, and R134a. This combination gives it versatile applications and makes it a popular choice in residential and commercial systems.

One of the main features of R407C is its zero ozone depletion potential (ODP). This is crucial in an era where environmental regulations are stricter and focus on reducing substances that could harm the ozone layer. R407C also boasts a relatively low global warming potential (GWP) compared to other refrigerants, which aligns with the growing demand for low-impact environmentally friendly solutions.

Technologically, R407C is compatible with many existing systems, particularly those designed for R22, making it a favored transitional refrigerant during the phase-out of ozone-depleting substances. However, it is vital to note that R407C operates at a higher pressure than R22, meaning that certain system components may need upgrading to ensure optimal performance and safety.

In terms of thermodynamic characteristics, R407C has a refrigerating effect similar to R22, making it efficient for cooling purposes across various applications. It has good heat transfer properties, which translates to efficient energy use in both residential and commercial installations. The refrigerant operates effectively across a broad temperature range, making it an ideal choice for air conditioners, heat pumps, and chillers.

Moreover, R407C is a near-azeotropic blend, which implies that it maintains its composition during evaporation and condensation. This characteristic helps in minimizing the risks of refrigerant fractionation, allowing for consistent performance over time.

Another noteworthy aspect of Fedders R407C is its favorable safety profile. It has a lower toxicity level compared to some other refrigerants, which enhances its suitability for varied applications. Additionally, it is non-flammable under normal conditions, making it a safe option for different installations.

In conclusion, Fedders R407C is characterized by its environmental safety, excellent thermodynamic qualities, and compatibility with existing refrigeration systems. As industries strive to meet new environmental regulations, R407C serves as a reliable option, providing performance without compromising on ecological concerns. Its pivotal role in transitioning to greener alternatives makes it a critical refrigerant in today’s climate-conscious market.
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