When a refrigeration system is being topped off with a small amount of refrigerant through the low side with the compressor running, what should be done?
• Safe charging practices for refrigeration systems on the low side • Differences between charging liquid vs vapor refrigerant • Function/position of suction and discharge service valves during charging
• Think about what happens if liquid refrigerant enters the compressor directly while it is running. Is that desirable or dangerous? Why? • Which service valve positions allow refrigerant to enter the system safely without blocking normal flow? • When topping off only a small amount on the low side, is it more common to add refrigerant as a liquid or as a vapor?
• Confirm which method of adding refrigerant helps avoid liquid slugging of the compressor • Review what front seated and back seated mean for service valves (which position stops, which allows, which cracks flow) • Verify which charging cylinder orientation corresponds to feeding liquid versus vapor refrigerant into the system
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