Daikin RDT Installation And Maintenance Manual page 20

Ventilation Clearance
Below are minimum ventilation clearance recommendations.
The system designer must consider each application and
provide adequate ventilation. If this is not done, the unit will not
perform properly.
Unit(s) surrounded by a screen or a fence:
1. The bottom of the screen or fence should be at least 1 ft.
(305 mm) above the roof surface.
2. The distance between the unit and a screen or fence
should be as described in
19. See also Figure 21.
3. The distance between any two units within a screen or
fence should be at least 120ʺ (3048 mm).
Unit(s) surrounded by solid walls:
1. If there are walls on one or two adjacent sides of the unit,
the walls may be any height. If there are walls on more
than two adjacent sides of the unit, the walls should not
be higher than the unit.
2. The distance between the unit and the wall should be at
least 96ʺ (2438 mm) on all sides of the unit.
3. The distance between any two units within the walls
should be at least 120ʺ (3048 mm).
Figure 22: Overhead Clearance
24" (610 mm)
maximum
96" (2438 mm)
minimum,
top of unit to
permanent
overhead
obstruction
IM 893-10 • ROOFPAK SINGLEZONE UNITS
Service Clearance on page
Overhead
canopy
24" (610 mm)
maximum
Do not locate outside air intakes near exhaust vents or other
sources of contaminated air.
If the unit is installed where windy conditions are common,
install wind screens around the unit, maintaining the
clearances specified (see
important to prevent blowing snow from entering outside air
intake and to maintain adequate head pressure control when
mechanical cooling is required at low outdoor air temperatures.
For pad-mounted units, it is recommended that the condenser
section be lifted a minimum of 12ʺ off the ground for proper
underside ventilation. This clearance allows for proper airflow,
optimal condenser performance and to prevent any minor
reductions in performance.
Overhead Clearance
1. Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit.
2. The area above the condenser must be unobstructed in
all installations to allow vertical air discharge.
3. The following restrictions must be observed for overhead
obstructions above the air handler section (see
22):
a. There must be no overhead obstructions above the
furnace flue, or within 9ʺ (229 mm) of the flue box.
b. Overhead obstructions must be no less than 96ʺ
(2438 mm) above the top of the unit.
c. There must be no overhead obstructions in the
areas above the outside air and exhaust dampers
that are farther than 24ʺ (610 mm) from the side of
the unit.
Flue box
20
M I
eChanICal nsTallaTIon
Figure 21). This is particularly
9" (229 mm)
minimum to flue box,
typical all sides
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Figure