or 
to toggle the format between 12HR and 24HR display. To exit the selection process and accept the
key.
or 
to toggle between Emergency Heat On
key to accept the change and exit the selection process.
key then press 
(UP) or 
(DOWN) to toggle between 12 hr and 24 hr clock. To accept the change, press the
key to return to the 1224 screen. Press the 
(UP) to go to the next menu BEEP.
or 
to toggle between Beep On and Beep
key to accept the change and exit the selection process.
key then press 
(UP)
(DOWN) to toggle between ON and OFF. To accept the change,
key to return to the BEEP screen. Press the 
(UP) to go to the next menu EMHT on Kühl+ models or F C for Kühl models.
or 
to select between AUTO, DM 20, OFF.
key to accept the change and exit the selection process.
key then press 
(UP) or 
(DOWN) to toggle between ON and OFF.
key to return to the EMHT screen.
(UP) to go to the next menu BAND.
or 
key to adjust. The adjust range is 3 to 10.
key then press 
(UP) or 
(DOWN) to toggle between
key to return to the BAND
(UP) to go to the next menu F C.
or 
at the same time to toggle between Fahrenheit or Celsius as their temperature unit of choice.
key to accept the change and exit the selection process.
key then
(UP) or 
(DOWN) to toggle between F and C. To accept the
key to return to the F C screen. Press the 
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.