SECTION 3 - HANDLING, STORAGE, AND INSTALLATION
PACE
│
Installation & Assembly Manual
Issue Date: 07/03/2018
24
Form PA102.20-N1
Figure 12 -
Minimum Service Clearances
LD6326-4
MIN. CLEARANCE DIMENSIONS
A
B
C
D
E
F
G
H
Fan Section
Coil Section
Face and Bypass Damper Section
Filter Section - Door should open 180°
Inlet Section
Rain Hood (add unit width or length)
Pipe Chase Enclosure (add to unit width)
Coil Access Panel on Outdoor Unit
(allow clearance = to unit width)
A
B C D
E
F
G
H
24"
24"
24"
UNIT WIDTH + 6 IN.
Assembling the PACE Provided Curb
The curb, which supports the AHU, will be shipped un-
assembled, and requires assembly on the job site. As-
sembly drawings and a hardware package, which in-
cludes a nailer and gasket
,
are shipped with each curb.
All other parts such as wood or fiber cant strips, roofing
felts and material, caulking, and curb-to-roof fasteners
are field supplied.
If there are questions about the number of curb parts
or assembling the curb, notify a PACE Field Service
Office immediately.
Use the following instructions to assemble the curb:
1. Unpack the shipping package. Layout the parts
according to the exploded views.
2. Layout all channel pieces as shown in
.
Make certain that all channel
tabs are located on inside of the mating channel.
and that all curb walls, accessories, and flanges,
which may have been distorted in handling, are
straightened before assembly.
3. Attach the curb walls together to form rectangular
perimeter as shown, leaving bolts loose. After the
curb is set in place, ensure proper consideration
has been given to the air duct openings through
the roof.
4. The curb installation drawing shows a gasket
that is mounted between the curb and the unit as
shown in
. This gasket is
shipped with the curb parts. Install the curb gasket
before setting the AHU on the curb. The gasket
forms an air seal between the AHU and the curb
and serves as a dampener, preventing metal-to-
metal contact between the AHU and curb. How-
ever, the gasket should not be used as a vibration
isolator where the prevention of noise and vibra-
tion transmission into the building is critical.
When the AHU is shipped in skids,
replace the curb gasket with the caulk
provided by contractor.
5. After verifying the curb is square and level, tighten
all bolts, and then anchor appropriately. DO NOT
tighten the bolts after anchoring because the curb
will be pulled, twisted, and torqued out of square.
6. Mark the exact location for the pipe chase curb.
Drill and assemble the pipe chase curb. The job
submittal drawing package contains a curb draw-
ing that shows the dimensions of the curb and
pipe chase.
7. Insulate and roof the curb as required. Refer to
Sheet Metal and Air Conditioning Contractors Na-
tional Association (SMACNA)
for counter flash in-
formation.
Steel Frame
When a steel frame is used to support the AHU, it must
be level, flat without uneven steel frame joints, and
support the AHU around the full perimeter. As a gen-
eral rule, cross members should be placed every 96
in., in addition to each shipping split.
