McQuay Skyline IM777, Руководство по установке и обслуживанию

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IM777 Page 7
Figure 10. Opening fan section door
Duct Connections
Flexible connectors should be used on the outlet and inlet
duct connections of all units. Do not position down flow fans
over air ducts that are routed down into the building. A dis-
charge plenum is recommended when bottom connections
are necessary.
See Figure 11.
Figure 11. Discharge plenum
If the unit has a top mixing box or economizer damper, or a
top duct connection, flashing must be field fabricated and
installed to divert moisture from the connection. The flashing
must lap over the standing seams of the top panels. The
flashing must also lap over the side edges of the unit.
See
Figure 12.
Figure 12. Flashing over top panels and sides of units
Dampers and Hoods
Side dampers may be provided in the mixing box and econo-
mizer sections of units. When dampers are provided, a
removable panel is located above the weather hood to pro-
vide access to the damper drive shaft. Other access may be
available depending on the specific construction of the unit.
See Figure 13 .
Figure 13. Filler panel over the weather hood
When units are ordered with exhaust hoods and intake hoods
adjacent to each other, a field supplied barrier is recom-
mended to prevent re-circulation of exhaust air into the
intake openings.
See Figure 14.
OPEN
View from inside door
Jam
Nuts
Do Not Rotate Cup
D i s c h a r g e
P l e n u m
F l a s h i n g
D u c t
F l a s h i n g
U n i t t o p
p a n e l
F l a s h i n g
D u c t
F l a s h i n g
Remove screws
and panel to access
damper control shaft.
Hood