Daikin DCG Series, Installation And Maintenance Manual

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

48”
Min.

48”

Min.

36”; minimum
roof overhang

48”

UNIT CLEARANCES

Adequate clearance around the unit should be kept for safety, ser-
vice, maintenance, and proper unit operation.  A total clearance
of 75” around this 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 be-
neath 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
DCG unit, a flue extension (MF# 220-GX-03) needs be to installed
to prevent flue gas recirculation.

 .

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.

P

ROTRUSION

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.

RIGGING DETAILS

T

O

PREVENT

PROPERTY

DAMAGE

, 

THE

UNIT

SHOULD

REMAIN

IN

AN

UPRIGHT

POSITION

DURING

ALL

RIGGING

AND

MOVING

OPERATIONS

. 

T

O

FACILITATE

LIFTING

AND

MOVING

WHEN

A

CRANE

IS

USED

, 

PLACE

THE

UNIT

IN

AN

ADEQUATE

CABLE

SLING

. 

WARNING