The suction pressure of R-134a in a low-temperature deep freezer can vary depending on several factors such as the design and specifications of the freezer, the temperature inside the freezer, and the operating conditions. It is important to note that I don't have access to real-time data or specific freezer details.
However, as a general guideline, the suction pressure of R-134a in a low-temperature deep freezer typically ranges between 1 to 5 psig (pounds per square inch gauge). This pressure range corresponds to the evaporator temperature, which is typically below 0 degrees Celsius (32 degrees Fahrenheit).
It's important to consult the manufacturer's specifications or refer to the equipment's technical documentation to obtain accurate and specific information regarding the suction pressure for a particular deep freezer model.