yellow jacket TITAN P51-870 User Manual

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14the evacuation or select a new mode of operation. If the vacuum hold timer is not desired, simplytap the Hold button until NONE is displayed.NOTE: Using the vacuum hold timer can help to ensure that all refrigerant has been evacuatedfrom the system and the system is free of non-condensables. Refrigerant and non-condensablescan cause the vacuum level to rise in a system giving a false positive during a leak test when noleak is present.Pressure Hold Mode – Pressure Decay TestOverview:The P51-870 TITAN™ can be used to monitor a system leak through a drop in positive pressure.The pressure decay test displays the current system pressure (Pc), the initial pressure (Pi), thechange in pressure (Pi-Pc), the Limit Pressure (Limit), and the Rate of Change (%/min).Figure 20: Evacuation - Pressure Hold Test Prompt