Overhead Clearance; Roof Curb Assembly And Installation - Daikin DPS005 Installation And Maintenance Manual

Overhead Clearance

1 . Unit(s) surrounded by screens or solid walls must have
no overhead obstructions over any part of the unit. For
heat pump models overhead obstructions could allow the
formation of dangerous ice cycles.
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:
a . There must be no overhead obstructions above the
furnace flue, or within 9" (229 mm) of the flue box.
b . Overhead obstructions must be no less than 96"
(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 24" (610 mm) from the side of the unit.
IM 1125-7 • REBEL ROOFTOPS

Roof Curb Assembly and Installation

Mold can cause personal injury . Some materials such
as gypsum wall board can promote mold growth when
damp. Such materials must be protected from moisture
that can enter units during maintenance or normal
operation .
Locate the roof curb and unit on a portion of the roof that can
support the weight of the unit. The unit must be supported to
prevent bending or twisting of the machine.
If building construction allows sound and vibration into
the occupied space, locate the unit over a non-critical
area . It is the responsibility of the system designer to
make adequate provisions for noise and vibration in the
occupied space .
Install the curb and unit level to allow the condensate drain to
flow properly and allow service access doors to open and close
without binding.
The gasketed top surface of the curb seals against the unit
when it is set on the curb. These flanges must not support
the total weight of the duct work. See
page 13 for details on duct connections. It is critical that
the condensate drain side of the unit be no higher than the
opposite side .
Assembly Instructions
Assembly of a typical roof curb is shown in
on page 8 and Figure 4 on page
1 . Set curbing parts A thru G per dimensions shown over roof
opening or on a level surface. Note location of supply air
opening. Check alignment of all mating screw holes.
2 . Screw curbing parts together using fasteners provided.
Leave all screws loose until curb is checked to be square.
3 . Square entire curbing assembly and securely tighten all
screws.
4 . Position curb assembly over roof openings. Curb must
be level within 0.25 inches from side to side and 1.50
inches over its length. Check that top surface of curb is
flat with no bowing or sagging.
5 . Weld curb assembly in place. Caulk all seams watertight.
Remove backing from 0.25 × 1.50 wide gasket and apply
to surfaces shown by crosshatching.
6 . Check that electrical connections are coordinated.
6
M I
eChanICal nsTallaTIon
WARNING
Installing Ductwork on
Figure 2, Figure 3
9 .
www.DaikinApplied.com