Roof Curb Mounting - Greenheck HRE-20 Installation, operationand Maintenance Manual

ROOF CURB MOUNTING

Rooftop units require curbs to be mounted first . The duct connections must be located so they will be clear of
structural members of the building .
1. Factory Supplied Roof Curbs
Roof curbs are Model GKD, which are shipped in a
knockdown kit (includes duct adapter) and require field
assembly (by others) . Assembly instructions are included
with the curb .
2. Install Curb
Locate curb over roof opening and fasten in place . (Refer
to Recommended Roof Openings) . Check that the diagonal
dimensions are within ±1/8 inch of each other and adjust as
necessary . For proper coil drainage and unit operation, it is
important that the installation be level . Shim as required to
level .
3. Install Ductwork
Installation of all ducts should be done in accordance with
SMACNA and AMCA guidelines. Duct adapter provided to
support ducts prior to setting the unit .
4. Set the Unit
Lift unit to a point directly above the curb and duct
openings . Guide unit while lowering to align with duct
openings . Roof curbs fit inside the unit base . Make sure the
unit is properly seated on the curb and is level .
Curb Cap Dimensions
Model
A B
HRE-20 2 .00 2 .00
HRE-45 2 .00 4 .25
HRE-55
2 .00 4 .25
HRE-90 2 .00 4 .25
All dimensions shown are in inches .
4
C D E
1 .00 0 .88 0 .75
2 .00 1 .31 0 .50
2 .00 1 .31 0 .50
2 .00 1 .31 0 .50
Roof curb details, including duct location
dimensions, are available on HRE roof curb
assembly instructions.
Curb Outside Dimensions
Curb Outside Dimensions
Model
HRE-20
HRE-45
HRE-55
HRE-90
All dimensions shown are in inches .
SIDE OF UNIT
A
B
C
D
E
ROOF CURB
Curb CAP Details for Factory Supplied Roof Curbs
L
W
Weight
L W
93 51 280
100 .5 60 .63 355
112 .75 71 .5 450
125 .75 90 .75 625
BASE
1 INCH INSULATION