Daikin RoofPak RPS Series, Installation And Maintenance Manual

Page: 21 / 130

Mechanical Installation
www.DaikinApplied.com 21 IM 926-3 • ROOFPAK APPLIED SYSTEMS
IBC Seismic Compliant Units
CAUTION
When welding unit to the curb, do not damage wiring (control
panel side). Weld ONLY in the specified zone in the acceptable
weld zone (see Figure 31 on page 22 ). Welding must
comply with weld fillet size, etc. as indicated in Figure 31 .
It is important to follow these installation instructions for all IBC
Seismic compliant Daikin Rooftop units.
IBC Seismic compliant Daikin Rooftop units can be mounted to
either a roof curb or a post and rail setup. If using a roof curb, it
must be specifically designed for seismic restraint and be IBC
seismic compliant (spring isolated or non-isolated type seismic
roof curbs are available). Typical construction of a seismic
rated roof curb is from structural steel framing and contains
seismic hold down brackets for attachment of the rooftop unit
(see Figure 30 ). Post and rail arrangements rated for seismic
applications are also available (spring isolated or non-isolated).
IMPORTANT: An acceptable IBC seismic installation
provides a direct positive attachment to both the building
structure and the roof mounted equipment .
Refer to the roof curb manufacturer’s submittal drawings for
actual roof curb assembly, attachment details and rigging
instructions for both roof curb and post and rail arrangements.
Roof Curb Arrangement
1. Set the rooftop unit on the roof curb (Daikin Rooftop units
are designed to overhang from the roof curb).
2. Adjust the seismic hold down brackets so they come into
contact with the unit base per Figure 31 and Figure 32
on page 22 .
a. The seismic hold down brackets should be
adjustable and accommodate the overhang of the
rooftop unit.
b. If the hold down bracket cannot reach the unit
base, use a shim spacer. See Figure 32 .
3. Weld each seismic hold down bracket (and shim spacer,
if required) to the unit base as shown in the acceptable
weld zone detail in Figure 31 .
NOTE:
High temperature insulation is installed at the factory
to allow for field welding along the lower front edge
region of the unit base.
Figure 30: Typical Seismic Roof Curb (Spring Isolated)
Seismic hold down brackets
Seismic hold down brackets
Structural steel frame
Spring
isolator
Duct opening