Refrigeration Maintenance 10-16
Unit Charging
NOTE: The electrical system must be energised throughout this procedure.
NOTE: Please take note of your refrigerant type (label on outside of unit), and make sure not to cross-contaminate.
NOTE: Before charging the system, make sure that the refrigerant lines from the gauge manifold to the refrigerant supply
bottle have been evacuated or purged.
1. Mid seat the suction service valve, the discharge service valve and receiver outlet valve remain mid-seated.
2. Weigh the tank of refrigerant.
3. Check the unit data plate for the required weight of refrigerant charge. Then subtract the amount of the charge to be input to
your unit from the total weight of the tank of refrigerant. This provides the final tank weight after the unit receives a full
system charge.
4. Set the refrigerant supply bottle for liquid. Open the gauge manifold hand valve to receiver tank and charge liquid refrigerant
into receiver tank until the system has the proper charge or until the system will take no more liquid. The remainder of the
charge will be added through the suction service valve if more refrigerant is required.
Unit Evacuation
1. Leave hand valve closed for first 5 minutes of evacuation
2. Valves to be in cracked open position
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