Specifications

4
Table 2 — Supply/Exhaust Fan Options Physical Data
Locate the Combination Curb
— Prior to locating the combi-
nation curb, consider the structural support required for the
rooftop system and the duct drop location in relation to the
joists. Allow sufficient space for service, clearance, and
locations of vents or other sources of air. Refer to Fig. 2 and 3
for ERV clearance requirements. Refer to the rooftop installa-
tion instructions for more information regarding location
considerations.
Prepare Roof Curb Location
— Cut a hole in the roof for duct
openings. Your local Carrier sales representative can provide a
dimensional drawing for the combination curb. See this draw-
ing for duct opening dimensions. Frame the opening to provide
adequate structural support.
Set the Combination Curb
— Set the combination curb over
the roof opening. Level the curb by placing shims under the
bottom flange of the curb. Secure the curb in place by welding
or fastening the curb to the roof.
Install Ductwork
— Ductwork will be installed in the curb for
combination curb applications. The supply duct will hang from
the top of the curb. The return duct will attach to a stub duct
provided with the combination roof curb.
NOTE: Ductwork must be installed before the RTU is set in
place.
Install Gaskets
— The combination curbs come with a gasket-
ing package to provide a seal between the RTU and ERV units
and the top perimeter of the combination curb. Install the gas-
ket around the top perimeter of the curb and around the supply
and return opening. Gasket strips must fit tightly together, leav-
ing no gaps for leakage.
Install Roofing Materials
— Insulate and add a cant strip to
the combination curb. Follow suggested and acceptable roofing
procedures for applying roofing materials. The roofing materi-
al should extend up to the wood nailer and be secured under the
counter flashing. Follow all local, national, and industry roof-
ing standards. Refer to Fig. 4 for roofing recommendations.
DROP-IN DAMPER BOX (62EB-EU Units) — The
drop-in damper box accessories are designed to fit into the re-
turn air openings of the standard factory curb of Carrier RTUs.
The damper box provides connections for return air from the
conditioned space, exhaust air to the ERV, and ventilation air
from the ERV. The ERV would be installed on a stand-alone
roof curb and field-supplied ductwork would be run between
the damper box and ERV curb. See Fig. 5. The maximum
length of the field-supplied duct is 100 equivalent feet.
FAN OPTION CODE A B C E F G H
Wheels
Qty...Width (in.)
1…5 x 4 1/8 2…5 x 4 1/8 1…15 3/4 1…19 3/4 2…19 3/4 3…19 3/4 4…19 3/4
Nominal Motor Hp
(per each fan)
0.61 0.61 1.18 3.62 3.62 3.62 3.62
FAN OPTION
CODE
JKLMNPRR
Wheels
Qty...Width (in.)
5…19 3/4 6…19 3/4 1…24 3/4 2…24 3/4 3…24 3/4 7…19 3/4 8…19 3/4 1…9 7/8
Nominal Motor Hp
(per each fan)
3.62 3.62 3.89 3.89 3.89 3.62 3.62 3.62
Fig. 1 — Typical Combination Curb
LEGEND
NOTES:
1. Return air ductwork sits 12 in. below bottom of
curb. (Stub duct provided.)
2. Dimensions shown in inches.
ERV — Energy Recovery Ventilator
RTU — Rooftop Unit