8
See the manual shipped with the roof curb for assembly
and installation instructions.
CLEARANCES
Unit Clearances
Figure 1
*In situations that have multiple units, a 48'' minimum
clearance is required between the condenser coils.
Clearance in accordance with local installation codes, the
requirements of the gas supplier and the manufacturer’s
installation instructions.
Adequate clearance around the unit should be kept for
safety, service, maintenance, and proper unit operation. A
clearance of 48" is recommended on all sides of the unit
to facilitate possible parts replacement, to allow service
access and to insure proper ventilation and condenser
airflow. The top of the unit should be completely
unobstructed. If units are to be located under an overhang,
there should be a minimum of 48” clearance and provisions
made to deflect the warm discharge air out from the
overhang. The unit should be installed remote from all
building exhausts to inhibit ingestion of exhaust air into the
unit fresh air intake.
NOTE: If the 48" minimum clearance is used on the
control panel side of a DFG unit, a flue extension
kit needs be to installed to prevent flue gas
recirculation. See table below for the kit selection.
Model size
Kit part number
7.5, 8.5, & 10 T
HEFLUE090120
12.5 T
HEFLUE150
Flue Extension Kits
Roof Curb Installation
Figure 2
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.
Knocked Down Roof Curbs
UNIT TONNAGE DESCRIPTION
PART NUMBER
7.5 to 12.5
Curb 14" Tall
0270L01153
Curb 24" Tall
0270L01154
Protrusion
Inspect curb to ensure that none of the utility services
(electric) routed through the curb protrude above the curb.
CAUTION
If protrusions exist, do not attempt to set unit
on curb.
ROOF TOP DUCT CONNECTIONS
Install all duct connections on the unit before placing the
unit on rooftop.
Horizontal Discharge
Refer to IOD-7082 included in the literature pack for
installing horizontal duct covers.
Flexible duct connectors between the unit and ducts are
recommended. Insulate and weatherproof all external
ductwork and joints as required and in accordance with
local codes.
