3-2
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Master Filter
Change the master filter when the moisture indicator is violet or
when the hour meter has accumulated 20 additional hours since
the last master filter change. Any hours already showing on the
meter when unit is originally un-boxed and setup should be
noted on the next page as the first entry. These should not be
included in the first filter change interval, but considered the
starting point. Refer to the Moisture Indicator Chart below.
Complete the Master Filter Maintenance Schedule on the
following two pages to track when to change master filter.
Moisture Indicator
Figure 3-1: Moisture Indicator Chart
Moisture Indicator Chart
Indicator Color Model Temperature
75°F/24°C 100°F/38°C 125°F/52°C
Purple R-12 1.4 ppm 2.5 ppm 4 ppm
Very Dry R-134a 20 ppm 35 ppm 60 ppm
Violet R-12 5 ppm 9 ppm 15 ppm
Dry/Caution R-134a 35 ppm 55 ppm 85 ppm
Pink R-12 15 ppm 27 ppm 45 ppm
Caution/Wet R-134a 90 ppm 120 ppm 150 ppm
Orange R-12 25 ppm 43 ppm 70 ppm
Very Wet R-134a 130 ppm 160 ppm 190 ppm
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