Dectron, Inc. March 2012
DSH/DSV/RSH/DBH/RBH Series Dehumidifier Owner’s Manual
Data subject to change without notice.
96
Installation Ducts Return Duct
Risk of property damage.
NOTE: If it is to be used as a natatorium dehumidifier,
do not install a dehumidifier in a return-air plenum
room. Corrosive chemicals in the air may shorten
the life of the electrical components.
If a plenum room is absolutely necessary, the
user should carefully maintain pool-water
chemistry. Chemicals should never be stored in a
plenum room, or any room containing mechanical
or electrical equipment.
Outdoor air must never enter a plenum room.
NOTE: Where ducts are to be insulated, use only
moisture-resistant insulation. High moisture
levels can cause failure of fiber adhesives.
NOTE: Do not
install a duct heater in the return duct.
NOTE: Poor return-duct design can prevent proper
dehumidification by causing uneven air
distribution over the evaporator. Reduced
capacity and/or equipment damage may result.
IMPORTANT!
Allow straight length in the return duct as shown.
This straight length must be the same size as the con-
nection on the unit. There should be no elbows,
transitions, offsets, or other flow interruptions closer than
2.5 X WIDTH of the return-duct opening.
If turning vanes are not used in elbows, allow a length
of straight duct equal to at least 5 X WIDTH.
IMPORTANT!
Temporarily cover the return grille with paper or
plastic to prevent concrete or plaster dust from
entering the return duct. This cover should be
removed after all such dusts have been cleaned up
and removed.
NOTE: Do not allow any air other than room air to
enter the return duct. Do not allow outdoor
air or air mixed with outdoor air to enter the
return duct.
DECTRON
Turning Vanes
DUCT
ISOLATOR
Sample
Appearance may vary.
Sample
Appearance may vary.
Vertical Units
INSTALLATION
NOTICE
Risk of carbon-monoxide poisoning.
Can cause death.
WARNING
Never install an unducted unit in the same space with combustion equipment. The
resulting low room pressure could cause flue downdrafts.
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