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WSV6 VERTICAL SERIES - IOM
WSV6 Vertical Series – IOM 23
INSTALLATION CONTINUED
DISCHARGE DUCTING
All ductwork should conform to industry standards of good
practice as described in ASHRAE System Guide. A field
supplied discharge duct system will normally consist of
flexible connector at the unit, a non-insulated transition
piece to the full duct size, a short run of duct, an elbow
without vanes and a trunk duct teeing into a branch circuit
with discharge diffusers as shown in
FIGURE 11 – Discharge
Ducting. The transition piece must not have an angle
greater than 30° or severe loss of air performance may
result.
DO NOT connect the full duct size to the unit discharge
collar without using a transition piece down to the size of
the unit discharge collar. With metal material, the sides of
the elbow and entire branch duct should be internally lined
with acoustic insulation for sound attenuation. Glass Fiber
duct board material is more absorbing and may permit
omission of the flexible connector. The ductwork should be
laid out so that there is no line of sight between the unit
discharge and the distribution diffusers.
RETURN AIR DUCTING
Return air duct can be brought in through a wall grille and
then to the unit. The return duct system will normally
consist of flexible connector at the unit and a trunk duct to
the return air grille. With metal duct material, the return air
duct should be internally lined with acoustic insulation for
sound attenuation. Glass Fiber duct board material is more
absorbing and may permit omission of the flexible
connector. A 1-inch air duct collar flange is included on the
filter rack for ducted return air application. A flexible duct
collar can then be attached between a duct transition and
the return air ductwork. The return air duct transition must
be the same size as the return air coil face area. See
FIGURE
12 – Return Air Ducting.
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Follow the filter rack kit installation instructions &
recommendations carefully.
FIGURE 12 – Return Air Ducting