Fedders R407C service manual Heat Mode Heat Pump Unit only

Models: R407C

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If the room temperature >=31°C, compressor off, outdoor fan off and 4-way valve remains on, indoor fan runs according to following table:

ID Room Temp., Tr

Tr<=31°C

31°C<Tr<32°C

Tr>=32°C

ID Fan

SET

*

LOW

*Maintain current state

The heating cycle starts and stops according to the result of set temperature - room temperature comparison:

ID Room Temp.

< Set pt-1°C

= Set pt-1°C

= Set pt.

=Set pt+1°C

> Set pt+1°C

Heat Mode Cycle

Start

Start

*

Stop

Stop

*Maintain current state

The 4-way valve will always be on in this mode except during de-icing, while the indoor fan will be turned on or off in accordance to cool air prevention requirement.

4.Auto Mode

Depending on the room temperature, the air-con controller will automatically select cool, dry or heat mode when this mode is first selected. The selected mode of operation will not be exited until Auto mode is de-selected. If automatic operation is chosen, auto mode will be automatically selected.

Room Temperature Range

Mode of Operation That Will Be Entered if Auto Mode

 

Is Selected

Room Temp. >24ºC

Cool Mode

19 ºC < Room Temp. ≤ 24ºC

Dry Mode

Room Temp. ≤ 19ºC

Heat Mode (Heat Pump Unit only)

Mode selection rule in Auto mode

The set temperature is internally set at 22ºC. In manual operation, the user can change it in

steps of 2ºC to 20ºC or 24ºC by pressing "" or "" button on the hand-held transmitter. Conversely, this is not possible in automatic operation.

5.Fan Mode

Only indoor fan and the vane operate in this mode.

The user can select the desired indoor fan speed and vane position, but auto fan speed selection is not available.

F8

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Fedders R407C service manual Heat Mode Heat Pump Unit only

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.