VACUUMING THE PIPING & THE INDOOR UNIT

•Unscrew the cap on the 2-way and 3-way valve.

•After all lines are installed and leak tested, set both the liquid and gas line valves to fully open position with the Allen Key for the unit operation, as shown.

•Reinstall the cap and torque to the specified value under Torque Table on page 10.

Restraining the piping

•

Wrap the tubing connection to

 

the unit with the insulation and

 

seal it with polyethylene tape.

•

You may connect an additional

 

drain hose. The end of the drain

 

outlet should keep a distance

 

from the ground.

•

Tape the connecting piping,

 

drain hose and wires with

 

polyethylene tape from bottom

 

upwards to the top, and secure

 

them to the wall.

•

Fill any gap in the wall that has

Using Allen Key to open fully for unit operation

Allen Key Cap

Clamp

been core drilled.

• Form a drip loop on the electri-

cal cable to prevent water

entering the electrical compart-

ment.

Drain Loop

Drain Hose

C16

Page 35 Page 37
Page 36
Image 36
Fedders R407C service manual Restraining the piping
Page 35 Page 37

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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