www.DaikinApplied.com 29 IM 1287-6 • REBEL APPLIED ROOFTOP
Roof Curb Assembly and
Installation
WARNING
Mold can cause serious illness and property damage. 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
ow properly and allow service access doors to open and close
without binding.
NOTE: It is critical that the condensate drain side of the unit
be no higher than the opposite side.
Integral supply and return air duct anges are provided with the
DPSA factory-provided roof curb, allowing connection of duct
work to the curb before the unit is set.
The gasketed top surface of the duct anges seals against the
unit when it is set on the curb.
These anges must not support the total weight of the
ductwork. Assembly of a typical DPSA roof curb is shown in
Figure 40. Assembly of a typical DPSA plenum curb is shown
in Figure 41 and can also have a full perimeter variation.
Curb Assembly instructions
1. Set curbing parts in accordance with assembly
instructions provided with unit. Take careful note of the
location of return and supply air openings or plenum
divider. Refer to submittal drawing for order-specic
details.
2. If applicable, set other curbing parts in place making
sure that the orientation complies with the assembly
instructions. Check alignment of all mating bolt holes.
See Figure 42, Detail A.
3. Bolt curbing parts together using fasteners provided.
Tighten all bolts nger tight.
4. Square entire curbing assembly and securely tighten all
bolts.
5. Position curb assembly over roof openings. Curb must
be level from side to side and over its length. Check that
top surface of the curb is at with no bowing or sagging.
6. Weld curbing in place. Caulk all seams watertight.
Remove backing from 0.25ʺ (6 mm) thick × 1.50ʺ (38
mm) wide gasketing and apply to surfaces shown by the
shaded areas in Figure 40 and Figure 41 on page 30.
7. Flash curbing into roof as shown in Figure 42, Detail A.
8. Be sure that electrical connection are coordinated (see
Figure 44).
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