Roof Curb Mounting
Roof curb details including duct location dimensions,
are available on Roof Curb Assembly Instructions, Part
Number 472119.
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. The GKD ships in a knockdown kit
(includes duct adapter) and requires field assembly
(by others). Assembly instructions are included with
the GKD curbs.
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 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. Install Insulation:
One-inch deep insulation
pans were provided with the curb assembly. Install
insulation prior to setting the unit. Insulation is not
included from the factory.
5. 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.
6. Fastening:
The installer is responsible for ensuring
that the unit fastening methods are sufficient
to account for the weight and size of these
additional modules.
Unit
Size
L
W
LF
WF
Curb Weight
(lbs.)
ERVe-20 61.103
40.353
61.007
40.161
93
ERVe-35 63.353
48.478
63.353
48.286
106
ERVe-45 67.353
55.478
67.353
55.286
120
ERVe-55 78.228
65.416
78.228
65.224
148
All dimensions are in inches.
Weights are for 14-inch high GKD type curbs.
W
L
W
WF
LF
L
Curb Outside Dimensions and Weights
Handling
While this unit was constructed with quality and
dependability in mind, damage still may occur during
handling of the unit for installation. Exercise extreme
caution to prevent any damage from occurring to the
refrigerant system.
The system design and installation should follow
accepted industry practice, such as described in
the ASHRAE Handbook. Adequate space should be
left around the unit for piping coils and drains, filter
replacement, and maintenance. Sufficient space should
be provided on the side of the unit for routine service
and component removal should that become necessary.
Lifting
1. Before lifting, be sure that all shipping material has
been removed from unit.
2. To assist in determining rigging requirements,
weights are shown below.
3. Unit must be lifted by all corner lifting points
provided on base structure.
4. Rigger to use suitable mating hardware to attach to
unit corner lifting points.
5. Spreader bar(s) must span the unit to prevent
damage to the cabinet by the lift cables.
6. Always test-lift the unit to check for proper balance
and rigging before hoisting to desired location.
7. Never lift units by weatherhoods.
8. Never lift units in windy conditions.
9. Preparation of curb and roof openings should be
completed prior to lifting unit to the roof.
10. Check to be sure that gasketing (supplied by
others) has been applied to the curb prior to lifting
the unit and setting on curb.
WARNING
All factory provided lifting lugs must be used when
lifting the unit. Failure to comply with this safety
precaution could result in property damage, serious
injury or death.
Energy Recovery Ventilator
6
®
