2.1B In Humid Area, Duct inlet and/or Outlet
If the humid area is very large or has high ceilings,
dehumidification can be improved by adding an inlet and/
or outlet duct to circulate and destratify stagnant areas.
For a large area, add inlet or outlet ducting to create flow
across the area’s greatest length.
For areas with ceilings higher than 12’, use an inlet
duct to draw warm, moist air from near the ceiling. See
section 2.4 for attaching duct collars & ducting.
2.1C In Remote Area, Duct Inlet & Outlet
It is often desirable, especially in pool rooms and
finished areas, to install the HI-E Dry in an adjacent
equipment room or unfinished area. Air is transferred
between the humid room and the unit via ducting.
The factory mounted humidity control on the HI-E Dry
cabinet may not sense the humidity in the humid room
accurately enough with this installation method. If so, an
additional humidity control can be mounted in the humid
room and wired to the HI-E Dry. Local electrical codes
must be followed when wiring the control.
2.1D In Remote Area, Duct Outlet Only
A simpler remote installation method than the one above
uses ducting only between the HI-E Dry discharge and
the humid room; the HI-E Dry inlet draws air from the
room in which it’s located. This works well if there is an
adequate air flow path between the two rooms; e.g., high
door undercut, louvered door or wall grill. This eliminates
the need to remote mount the humidity control. There are
several potential disadvantages to using this method.
First, humid air is drawn into the room where the HI-E
Dry is located. Second, to accurately sense humidity,
the blower in the HI-E Dry may need to run continuously
to draw air from the humid room into the HI-E Dry room.
Third, a slight negative pressure is created in the room
with the HI-E Dry which could back draft open combustion
devices located there. If such devices are present, call
the factory for specific instructions before using this
installation method or consider the option below.
2.1E In Remote Area, Duct Inlet Only
When the HI-E Dry is located in a room separate from
the main area to be dehumidified, it may be desirable
to dehumidify and/or slightly pressurize that room.
Pressurization assures that open combustion devices
do not back draft as would be the case if the room was
sufficiently de-pressurized. This can be accomplished
by installing a duct from the humid room to the HI-E
Dry inlet and by allowing the HI-E Dry to discharge the
dehumidified air into the room in which it’s located. An
adequate air flow path must exist between the two rooms
for this method to work well. An additional humidity
control may need to be mounted in the humid area and
wired to the HI-E Dry to accurately maintain the desired
humidity. Local electrical codes must be followed when
wiring the control.
2.2 Electrical Requirements
The HI-E Dry plugs into a common grounded outlet on a
15 Amp circuit. It draws between 6 and 7 Amps under
normal operating conditions. If used in a wet area (pool,
spa room, or basement prone to flooding), a ground fault
interrupter protected circuit is required.
If an extension cord is required, it must have a minimum
of 16 gauge conductors if less than 25 feet long and 14
gauge if greater than 25 feet.
2.3 Condensate Removal
The HI-E Dry is equipped with a condensate pump
to remove the water that is condensed during
dehumidification. This allows the condensate to be
disposed of at a distant location, or to be pumped to
a level above the HI-E Dry. The condensate pump is
mounted inside the HI-E Dry as an integral part of the
unit. If the condensate must be pumped more than 18
feet above the unit, a second pump must be added to
relay the condensate.
2.4 Ducting
2.4A Optional Ducting
An inlet shroud with a 8” round collar and an 8” round
exhaust collar are available from the factory that will
allow round ducting to be attached to the inlet and/or
outlet of the HI-E Dry.
2.4B Ducting for Dehumidification
Ducting the HI-E Dry as mentioned in sections 2.1B-2.1E
requires consideration of the following points.
Duct Sizing:
For total duct lengths up to 25’, use a
minimum 8” diameter round or equivalent rectangular.
For longer lengths, use a minimum 10” diameter or
equivalent. Grills or diffusers on the duct ends must not
excessively restrict air flow.
Isolated Areas:
Effective dehumidification may require
that ducting be branched to isolated, stagnant areas.
Use 6” diameter branch ducting to each of two or three
areas; use 4” to each of four or more areas.
2.4C Ducting for Fresh Air
Fresh air can be brought into the structure continuously
by connecting a duct from outside to the HI-E Dry inlet
and by turning on the fan switch. Advantages of this form
of ventilation include:
1. Outside air is filtered before entering the building.
2. Outside air will be dehumidified before entering if the
HI-E Dry is running.
3. Drawing air from outside and blowing inside aids
in pressurizing the structure. This helps prevent
unfiltered and undehumidified air from entering
elsewhere. It also reduces the potential for
carcinogenic radon gas to enter.
4. The need for an alternate ventilation device may be
eliminated.
2
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