Install Instructions

81
IM-PR 566442 1114 (Design Manual)
Figure 3-5 Use of a psychrometric chart to determine the dewpoint based on drybulb and relative humidity.
To determine the dewpoint, find the drybulb temperature on the horizontal axis and then move up vertically
until you reach the corresponding sloping relative humidity line. From this intersection, move horizontally
to the left until you reach the end of the chart, where you will read the value of the dewpoint along the line
labeled “wetbulb temperature.”
Relative Humidity %
20
40
60
80100
30 40 50 60 70 80 90 100 110 120 130
30
40
50
60
70
80
Dewpoint of 42.8°F for drybulb of
68°F and 40% RH
WetBulb Temperature °F
DryBulb Temperature °F