Roof Curb Mounting

Curb Outside Dimensions and Weights

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

SIDE OF UNIT

A

B

C

D

E

BASE

1 INCH INSULATION

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

Set the Unit

 

curb and is level.

 

 

 

 

 

Curb Outside Dimensions and Curb Weights (lbs)

Unit Size

L

W

Weight

ERCH-HP 20

104.88

51.00

310

ERCH-HP 45

115.75

60.63

400

ERCH-HP 55

129.88

71.50

510

ERCH-HP 90

148.13

90.75

720

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.

10Model ERCH-HP Energy Recovery Unit

ROOF CURB

Curb Cap Details for Factory-Supplied Roof Curbs

Curb Cap Dimensions

Unit Size

A

B

C

D

E

 

 

 

 

 

 

ERCH-HP 20

2.00

2.00

1.00

0.88

0.75

 

 

 

 

 

 

ERCH-HP 45

2.00

4.25

2.00

1.31

0.50

 

 

 

 

 

 

ERCH-HP 55

2.00

4.25

2.00

1.31

0.50

 

 

 

 

 

 

ERCH-HP 90

2.00

4.25

2.00

1.31

0.50

 

 

 

 

 

 

All dimensions are in inches.

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Greenheck Fan 473501 manual Roof Curb Mounting Curb Outside Dimensions and Weights, Install Ductwork, Set the Unit Lift

473501 specifications

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