Troubleshooting Guide

13 | Page

9. Move a temperature/humidity measuring instrument to the outlet of the dehumidifier.

10. Allow time for the measuring instrument to get a good, stable reading.

11. Record the outlet air temperature and RH.

12. Find the outlet air moisture content in Graph 2 below. Locate the outlet air temperature at the

bottom of the curve and draw a straight line up until you meet the outlet air RH curve then read

the moisture content where the two intersect at the left (.72 ppd/CFM @ 115°, 12% RH example

shown).

13. Subtract the outlet air moisture content from the inlet air moisture content to determine the

amount of moisture being removed by the dehumidifier.

EXAMPLE:

Measured Static Pressure = 0.2”w.c.

Airflow From Table 1 or 2 = 120 CFM

Inlet Air Temperature = 80°F

Inlet Air %RH = 60%

Inlet Air Moisture Content (Graph 1) = 1.31 ppd/CFM

10%

15%

20%

25%

30%

35%

40%

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

1.10

1.20

75 80 85 90 95 100 105 110 115

Outlet Air Moisture (ppd/CFM)

Outlet Air Temperature (°F)

Graph 2

Outlet Air Moisture Content