Risk of uncontrolled condensation. Can cause property damage.
Improper design, installation, and/or operation can lead to uncontrolled condensation of water,
with associated property damage.
Dectron, Inc. March 2012
DECTRON
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Air Distribution Installation
Data subject to change without notice.
79
Recommended Minimum Temperatures for Interior Surfaces
Relative Room Dry Bulb Temperature °F
Humidity % 72 76 80 84 88
Recommended Interior Surface Temperature to Prevent Condensation (°F)
40 51 55 59 62 65
50 57 61 65 68 72
60 62 66 70 73 77
OUTSIDE WALL
ΔΔ
Prevent Condensation
The quantity of supply air and the air velocity from the
air distribution system must be sufficient to blanket
areas of low R-values, especially exterior glass com-
ponents, with warm, dry air.
The design goal is to keep all surfaces at least 5°F
above the room dew-point temperature. (See table
below.) In order to prevent condensation, supply air
must be blown directly onto the entire surface of the
glass using linear diffusers.
For windows mounted high on walls, supply air must
be directed at the glass surface from close range
(register throws less than twelve inches to the closest
portion of the glass). Air quantity and velocity must be
large enough to blanket the entire glass surface with
warm dry supply air. Pool rooms with a number of high
windows on the wall and/or skylights should have a
perimeter type air distribution located high up as well.
Where installed for a natatorium:
ΔΔ
Reduce evaporation
Do not blow supply air directly across the pool
surface or wet deck. The air velocity directly above
and close to the pool water surface should be in the 10
to 50 feet per minute range. Higher air velocities can
increase the evaporation rate of the pool, greatly
reducing humidity control efficiency and increasing
energy consumption.
ΔΔ
Improve bather comfort
Due to wind chill, bather comfort is also increased by
keeping air velocity near the pool as low as possible,
(subject to above requirements) especially for
swimmers just leaving the pool water.
Δ If a ceiling fan is used in a natatorium, locate it over
the pool deck only and use up-flow operation. Other
operation may greatly increase pool
evaporation.
WINDOW
SUPPLY DUCT
DIFFUSER
POOL, if any
Never blow supply air directly
across a pool surface.
12 inches
or less
Allow 3 - 5 CFM
of air per square
foot of glass.
WINDOW
Ceiling Fan
Ceiling Fan
Direct air at
windows at a sharp
angle. See “Coanda
Effect” in ASHRAE
Fundamentals.
INSTALLATION
NOTICE
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