The ideal suction pressure for a freezer using R22 refrigerant can vary depending on various factors such as the specific design of the freezer, the desired temperature range, and the operating conditions. However, I can provide you with a general guideline.
For a typical freezer operating with R22 refrigerant, the ideal suction pressure at the evaporator outlet is usually maintained within a range of 5 to 15 pounds per square inch gauge (psig). This pressure range helps ensure proper cooling and efficient operation of the freezer.
It's important to note that the ideal suction pressure may differ for different freezer models, and the manufacturer's specifications and guidelines should always be followed for optimal performance. Additionally, it's recommended to consult a qualified HVAC or refrigeration technician who can accurately assess and adjust the suction pressure based on the specific system and conditions to achieve the best results.