ERV
HE2XRT
9
1.800.627.4499
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
RENEWAIRE.COM
INSTALLATION
INSTALLATION INSTRUCTIONS
PLANNING YOUR
INSTALLATION
MOUNTING THE UNIT ON ROOF CURBS
The base of the HE2XRT is designed for installation
on typical Roof Curbs that come with 1½" wide
wood nailers on the top edge. See figure 3 in
PLANNING YOUR INSTALLATION for appropriate
curb size.
Set HE2XRT in place. We recommend bolting
through sides of unit base into the Roof Curb to
secure the unit against high winds.
ON EQUIPMENT RAILS (HE2XRTH ONLY)
Review drawing of Roof Curb and specify
Equipment Rail to fit. Before installing HE2XRT,
apply roofing and counterflashing to Equipment
Rails as per standard practice.
BASIC REQUIREMENTS
Always connect an RA and an FA duct to each
Rooftop unit.
• With Rooftop units, the RA and FA ducts cannot
be interchanged.
• With RTV units, both ducts are inside the build-
ing. In other units, such as the RTR/RTF and
RTEC/RTH, that utilize the optional roof adapter,
at least one of the ducts is outside and must be
weatherized.
• 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 HE2XRT are
generally installed at this time. Install (2) ducts with
HE2XRTV, (1) duct with HE2XRTR or RTF.
Ducts should be insulated on the inside or the
outside:
• If insulation is applied to outside of duct, duct
should be 12" x 12", with 2" or 3" lips turned
out at the top.
• If insulation is applied to inside of duct, duct
should be 14" x 1", with 1" or 2" lips turned
out at the top.
Drop duct(s) into openings in top of roof curb.
Install appropriate gasket on top of Roof Curb
and edges of ducts.
Tape both inner and outer vapor barriers of insulated
duct to collars on duct adapters. This is critical to
prevent migration of moisture into insulation. Build-
up of moisture can result in failure of the duct system
and/or frost in the insulation. Make sure any tears in
the inner and outer vapor barriers are sealed.
CAUTION
Before bringing power to the unit check unit nameplate
to confirm it matches the voltage and phase of the
power you are supplying. Remember that your field
connections need to be accessible for inspection.
CAUTION
ELECTRICAL SPECIFICATIONS
Electrical Options are identified on the Unit Label
(located near electrical box). Find the complete
Unit Model Number in the lower left corner of the
Unit Label.
Danger of Electrical Shock when servicing an
installed unit.
ALWAYS DISCONNECT POWER SOURCE BEFORE
SERVICING!
More than one disconnect switch may
be required.
Proper Wiring Size Selection and Wiring Installation
are the Responsibility of the Electrical Contractor.
WARNING
