Connect the hoses from your manifold gauge to the pressure taps on the liquid and suction service valves. Safety Issues Safety, of course, is an essential part of working with any refrigerant. If provided by the manufacturer and the system is new and or completely clean, the system can be accurately charged by measuring the suction pressure, measuring outdoor air temperature and then adding charge until the liquid pressure is at the chart requirement.
If the exact charge is known, use a high accuracy high resolution digital scale to weigh in the entire charge. A proper evacuation is critical to proper performance. The blower must be capable of moving the correct amount of air.
When a system is equipped with a fixed metering device or capillary tubes, the total superheat varies with the outdoor air temperature and the heat load on the evaporator air temperature and humidity. Inspect the coils, blower wheels and the blower motor speed to insure they are operating properly.
Set the required airflow. Service valve locations can be found anywhere within the outside cabinet, but generally they are located near the coil.
In order to verify charge by the approach method, the evaporator airflow must be properly set, and the evaporator coil and condenser coil completely clean. Place the attachment approximately 6 inches from the liquid service valve.
Turn the cylinder upside-down to recharge the system.
Subscribe Connect. Then check the system's performance. Click image to enlarge! After the charge has been set, avoid installing the gauges as part of regular service.
Normal Running Pressures for R134A. Edwards, Alan. How to Measure Conductivity. Need help with this process go HERE!
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