Dectron, Inc. March 2012
Owner’s Manual
DSH/DSV/RSH/DBH/RBH Series Dehumidifier
Data subject to change without notice.
91
General Ducts Installation
DECTRON
IMPORTANT!
This unit is not a convenience air conditioner - it is a process dehumidifier, which has been carefully
sized to balance the required dehumidification load.
To be sure that the load will be balanced, it is essential to deliver the correct amount of air evenly
distributed over the heat exchangers. Ductwork can have a marked effect on performance.
••
Failure to set the airflow rates to within 10% of the specified values will result in performance reduction.
••
Duct design must conform to the ASHRAE low-pressure, low-velocity duct standards. If there is a question
concerning duct design, sizing, choice of materials, air velocities, or static pressures, contact your Dectron
representative for assistance.
••
Air velocities should be kept low to allow good air movement and low noise. Higher static pressures result in
higher power requirements and increased noise. The maximum external static pressure is specified for each
unit. Static pressures higher than specified may reduce airflow below the minimum acceptable value.
••
Select grilles, registers, and diffusers for low static pressure loss, required throw, and specified airflow. If the
unit is to be used in a natatorium, choose hardware resistant to deterioration due to chemicals in the pool
enclosure.
ΔΔ
Duct material
••
The unit is suitable for use with any duct material, subject to the requirements of this section and standard
practice. Standard galvanized steel duct is recommended. Use external duct insulation where necessary. If
insulation must be used inside the ducts, use only moisture-resistant types.
••
Where located in areas below room temperature, ductwork must
be insulated on the outside with 2- inch fiber
glass wrap with FSK facing. All ducts must be designed to be dry. All seams must be sealed. If a below-
grade duct system is used, transite or PVC-coated round metal ductwork should be used.
ΔΔ
Flexible duct connectors
••
Use flexible duct connectors to attach the ducts to the DRY-O-TRON
®
.
••
Install the flexible duct in such a way as to prevent mechanical loads from being applied to the unit, and to
prevent unit vibration from being transmitted to the ductwork.
INSTALLATION
Arrange all ducts so as to leave adequate working
clearance and access to the unit. See Lifting and
Locating - Select Air Handler Location.
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