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6
•
Sufficient structural support must be determined prior to
locating and mounting the curb and package unit.
•
Ductwork must be constructed using industry guidelines.
The duct work must be placed into the roof curb before
mounting the package unit. Our full perimeter curbs
include duct connection frames to be assembled with the
curb. Cantilevered type curbs are not available from the
factory.
•
Curb insulation, cant strips, flashing and general roofing
material are furnished by the contractor.
The curbs must be supported on parallel sides by roof members.
The roof members must not penetrate supply and return duct
opening areas as damage to the unit might occur.
NOTE:
The unit and curb accessories are designed to allow vertical
duct installation before unit placement. Duct installation after unit
placement is not recommended.
A
LL
CURBS
LOOK
SIMILAR
. T
O
AVOID
INCORRECT
CURB
POSITIONING
,
CHECK
JOB
PLANS
CAREFULLY
AND
VERIFY
MARKINGS
ON
CURB
ASSEMBLY
. I
NSTRUCTIONS
MAY
VARY
IN
CURB
STYLES
AND
SUPERCEDE
INFORMATION
SHOWN
.
CAUTION
See the manual shipped with the roof curb for assembly and in-
stallation instructions.
CLEARANCES
75"
48"
48"
6"
36" MINIMUM
ROOF OVERHANG
UNIT CLEARANCES
Adequate clearance around the unit should be kept for safety,
service, maintenance, and proper unit operation. A clearance of
75” on the service side of the unit is recommended to facilitate
possible blower assembly, shaft, wheel replacement, coil, heat
exchanger, electric heat and gas furnace removal. This unit must not
be installed beneath any obstruction. This unit should be installed
remote from all building exhausts to inhibit ingestion of exhaust
air into the unit’s fresh air intake.
NOTE: If the 48” minimum is used on the control panel side of a
DBG unit, a flue extension (MF# 220-GX-03) needs be to installed
to prevent flue gas recirculation.
NOTE: 15 & 20 ton models have 3 fans.
25 ton models have 2 fans.
INSULATED
PANELS
ROOF CURB INSTALLATION
ROOF CURB POST-INSTALLATION CHECKS
After installation, check the top of the curb, duct connection frame
and duct flanges to make sure gasket has been applied properly.
Gasket should be firmly applied to the top of the curb perimeter,
duct flanges and any exposed duct connection frame. If gasket is
loose, re-apply using strong weather resistant adhesive.
Protrusion
Inspect curb to ensure that none of the utility services (electric)
routed through the curb protrude above the curb.
I
F
PROTRUSIONS
EXIST
,
DO
NOT
ATTEMPT
TO
SET
UNIT
ON
CURB
.
I
NFORMATION
SHOWN
.
CAUTION
ROOF TOP DUCT CONNECTIONS
Install all duct connections on the unit before placing the unit on
rooftop.