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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.
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.
Install Curb: Locate curb over roof opening and
fasten in place. Reference Installation, Unit Weights
and Recommended Roof Openings in this manual.
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.
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.
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 Outside Dimensions and Curb Weights (lbs)
Unit Size
L
ERCH-HP 20
104.88
ERCH-HP 45
115.75
ERCH-HP 55
129.88
ERCH-HP 90
148.13
All dimensions are in inches. Weights are for 12 inch high
curbs. Roof curb details, including duct locations dimensions
are available on the roof curb assembly instructions.
10
Model ERCH-HP Energy Recovery Unit
Set the Unit
W
Weight
51.00
310
60.63
400
71.50
510
90.75
720
Curb Outside Dimensions and Weights
SIDE OF UNIT
A
B
C
D
E
ROOF CURB
Curb Cap Details for Factory-Supplied Roof Curbs
Curb Cap Dimensions
Unit Size
A
ERCH-HP 20
2.00
ERCH-HP 45
2.00
ERCH-HP 55
2.00
ERCH-HP 90
2.00
All dimensions are in inches.
BASE
1 INCH INSULATION
B
C
D
2.00
1.00
0.88
4.25
2.00
1.31
4.25
2.00
1.31
4.25
2.00
1.31
E
0.75
0.50
0.50
0.50
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