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18
HE-Series Outdoor
ERV
INSTALLATION
5.0 INSTALLATION
Basic Requirements:
Always connect an RA and an FA duct to each Rooftop unit.
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With Rooftop units, the RA and FA ducts cannot be interchanged.
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With RTV units, both ducts are inside the building. In other units, such as the RTR, RTF and
RTH, at least one of the ducts is outside and must be weatherized.
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Any weatherized duct must be thermally insulated to prevent condensation on the inside or
outside of the duct. The duct lining must be vapor-sealed, and the duct exterior must be rain
tight. Duct(s) connected to the bottom of the HE1.5XRT are generally installed at this time.
Install (2) ducts with HE1.5XRTV, (1) duct with HE1.5XRTR or RTF.
Drop duct(s) into openings in top of roof curb.
Install appropriate gasket on top of Roof Curb and edges of ducts.
5.2.1 Inside Ductwork System
Follow Engineer’s Ductwork Design; Ductwork should be designed by an engineer to allow the
unit to provide the required airflow.
5.2 DUCTWORK
Tape both inner and outer
vapor barriers of insulated
duct to collars on duct
adapters. This is critical to
prevent migration of mois-
ture into insulation. Build-up
of moisture can result in
failure of the duct system
and/or frost in the insula-
tion. Make sure any tears
in the inner and outer vapor
barriers are sealed.
CAUTION
5.1 CURB SPECIFICATIONS
NOTE: Ducts inside
a building that are
connected to the
outside must be
insulated with a sealed
vapor barrier on both the
inside and the outside of
the insulation.
For all rooftop curbs, the curb is to be placed in a location specified by the Architect/Engineer
as being capable of supporting all known loads. Curbs are to be installed using Industry Best
Practices. For installation guidelines, see the current National Roofing Contractors Association
(NRCA) manuals.
For metal roofs that are supported by structural steel, the supporting structural steel must
be located so that it supports the entire perimeter of the curb. Ideally, the curb will be placed
directly on the structural steel and the metal roof decking is to be fitted around the curb. It
is acceptable to place the metal roof decking on the structural steel and then place the curb
on top of the metal roof decking. When this is done, wood fillers must be installed in the
decking corrugations to provide complete support for the curb bottom flanges.
In all cases, all
four bottom flanges of the curb must bear directly on or over the structural steel roof
supports.
For pre-stressed concrete roofs, the location of the curb must be approved by an engineer as
being capable of supporting all known loads.
Curbs are shipped knocked-down and include all necessary assembly hardware, to include
foam gasketing tape. To assemble the curb, assemble the four sides of the curb with the
provided hardware, but leave the hardware loose. When the four curb sides are assembled,
install the provided mid-rails within the curb walls and then tighten all fasteners. See Dimension
Drawings on pages 5 and 6 for curb dimensions.
Curb clips are available as an optional accessory and can be installed as needed. Install foam
gasketing (provided) on all bearing surfaces on the curb.
Optional installation of owner-provided rails (HE1.5XRTH only):
RenewAire recommends that all HE1.5XRT units be installed on a RenewAire-supplied curb that
is manufactured to match individual units. The only unit that may be installed on owner-supplied
mountings rails is the HE1.5XRTH. When owner-supplied mounting rails are used, RenewAire
cannot provide installation instructions and it is the responsibility of the installer to verify
compliance with all local building codes and structural integrity of the installation. Any such
installation on owner-provided rails must be reviewed and approved by an engineer.
