appears on screen. This icon will not be dismissed until maintenance has been performed. If the service icon 
is on standby the system has sensed an abnormal condition.
goes away.
illuminates when the compressor lockout is active. Whenever the compressor shuts off, system pressures must be allowed to equalize. At this time, an internal timer begins a 
displays letting you know that the compressor will not operate until the 
is off. Once the timer has cleared, the air conditioner will heat or cool based on the temperature setting. Electric heat is not affected by this timer.
button delays the freeze protection function
will be inserted before other messages such as “COOL”. If the Low Battery 
alert is on, the battery in the control unit must be changed. Refer to the changing the battery procedure. Once the battery is changed, the alert message will go off. Refer to Troubleshooting Tips. Under normal conditions the battery life should be greater than 7 years.
– The front panel push buttons can be locked to prevent inadvertent operation. To lock the front panel, press and hold the 
buttons for three (3) seconds. A double beep indicates your mode change was successful and a 
icon appears on the display. To unlock
buttons for three (3) seconds. The 
icon will no longer be visible.
icon displays, the timer may be reset by pressing
button for three (3) seconds. A beep indicates the
system timer was reset and the 
icon and the word " 
for 3 seconds, the TIME
(UP) or 
(DOWN) buttons to scroll
button to enter the displayed function. If left inactive for 15 minutes the User Menu display will no longer be visible and it returns to normal operation mode display. To manually
button.
or 
to move the dot left or right (respectively) along the week. The user
to loop back to the hours setting. To exit the
key which will go to the time screen.
to loop back to the hours setting. To exit the selection process and accept the changes, the user presses the 
.
until the hours
(UP) or (DOWN) to advance
. The day of the week
(UP) or 
(DOWN) to select the current
key to save and go back to the TIME screen.
(UP) to go to the next menu 1224.
button again will exit the user menu function mode. Or simply leave the control inactive for 15 minutes and the control will return back to normal operation.
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.