Trane BAYUTIL102 is a utilities extension designed to provide easy access to electrical power, low voltage control, gas piping, and condensate drain connections for single packaged units mounted on a matching full perimeter curb. It features knockouts for condensate drain and gas piping connections, a rubber bushing for the low voltage electrical opening, and supports for supply and return duct connections.
Trane BAYUTIL102 is a utilities extension designed to provide easy access to electrical power, low voltage control, gas piping, and condensate drain connections for single packaged units mounted on a matching full perimeter curb. It features knockouts for condensate drain and gas piping connections, a rubber bushing for the low voltage electrical opening, and supports for supply and return duct connections.
Model:
BAYUTIL101
BAYUTIL102
Used with:
BAYCURB050
BAYCURB051
Installer’s Guide
Through the Base Utilities Curb Extension
18-HE38D11-3B-EN
Typical Rooftop Installation
Installer’s Guide
Page 2
General
This Installer's Guide covers the through the curb
utilities extensions listed for the 1-1/2 thru 5 ton only
single packaged units.
The BAYUTIL Utilites Extension is designed to provide
access within the curb for the electrical power, low
voltage control, gas piping, and condensate drain
connections when the single packaged unit is mounted
on its matching full perimeter curb. The unit must have
the appropriate full perimeter curb (BAYCURB 050 or
051) selected for the matching (BAYUTIL 101 or 102)
extension. The Extension provides the duct supports for
the supply and return duct connections.
The BAYUTIL through the curb utilities extension is
mounted on top of its matching full perimeter curb.
Remove the three (3) duct support pieces from the curb,
only use the duct support provided with the BAYUTIL.
See page 3.
For instructions related to the Roof Mounting Curb, refer
to the instructions provided with the curb.
For instructions related to the Single Packaged Unit,
refer to the instructions provided with the unit.
NOTE: The roof mounting curb (frame) not only
provides support for the unit, but permits easy
penetration of the roof for the connecting ductwork.
The roof mounting curb provides for proper ashing
and sealing by the roong contractor as approved by
National Roong Contractors Association
Installation
These instructions do not purport to cover all
variations in systems nor to provide for every
possible contingency to be met in connection with
installation. Should further information be required or
should particular problems arise which are not covered
suciently for the purchaser’s purposes, the matter
should be referred to the manufacturer.
Check for transportation damage after the utility curb is
uncrated. Report promptly, to the carrier, any damage
found to the utility curb.
Install and seal the BAYCURB Roof Mounting Curb per
the instructions included with the curb, including the
P.V.C. rubber gasketing materials, to provide a water
tight seal to the Utility Extension.
EXCEPTION: Do not install curb's duct supports. You
will use duct supports provided with the utility extension
curb. Mount the Utility Extension on top of the Roof
Mounting Curb.
Field fabricated ducts are to be installed from above
Utility Extension, and should be installed at this time.
See Figures 2 and 3 for illustrations.
P.V.C. tape is to be applied to extension as shown, prior
to setting the unit. P.V.C. rubber tape (supplied with the
curb and extension) must be applied in continuous strips
overlapped 1" minimum for a complete watertight seal.
The two (2) Hold Down Brackets (packed with the
extension) are used to secure the unit to the roof curb,
see Figure 5 (page 5). Each bracket is secured with four
(4) screws, one (1) existing on the unit, the other three
(3) shipped with the extension.
Application
Knockouts are provided for the condensate drain and
the gas piping connections, extra rubber bushings are
packed in the literature bag.
The low voltage electrical opening is are provided with a
rubber bushing installed.
Packaged Unit*
Gasket*
1 X 4 Nailing Strip*
Metal Cap Flashing
Roof Insulation
Composition
Flashing
Composition
Roofing
Wood Cant Strip
Insulated
Utility
Extension
Curb*
Roof
Mounting
Curb*
Roof
Insulation
Roof
Deck
*Items available
from manufacturer
Figure 1. Cross Section of Unit, Extension, Curb and Roof
Installer’s Guide
Page 3
Field Fabricated (side X side) Ducts Installed From Above Utility Extension Curb
Lower Field Fabricated Ducts into position on Duct Supports. See Figures 2 and 3. Make assembly secure with
sheet metal screws. See Figure 3.
HVAC Unit
Return Duct
Utility Extension Curb
Roof
Curb
Supply Duct
Drain
Utility
24V Supply
Single Point/Dual Point Power Utility
Gas Utility
NOTE: All holes are capped
except for 24V Supply.
Dimensional Data Ta ble
HightDimensional Data WidthLength
4.740.63 48.15BAYUTIL101
(for BAYCURB050)
4.743.63 57.87BAYUTIL102
(for BAYCURB051)
.38Flange for both
WidthLengthSupply and Return
Ducts
BAYUTIL10115.00 19.50
BAYUTIL10220.00 19.50
Figure 2. Field Fabricated Ducts and Dimensional Data
Figure 3. Positioning Ducts on Curb
Roof
Mounted
Curb
Utility Extension Curb
Return Air
Duct Supply Air
Duct
Installer’s Guide
Page 4
P.V.C. Rubber Gasket
Position on the BAYUTIL-- Extension for Unit Placement
1. Place the 1-1/2" x 1/2" P.V.C. rubber tape (gasket)
on mounting curb as illustrated in Figue 4. P.V.C.
tape to be applied to curb as shown after installation
of eld installed suppllly and return ducts and just
prior to setting unit on mounting curb.
2. P.V.C. rubber tape (supplied with curb) must be ap-
plied in continuous strips of overlapped 1" minimum
for complete watertight seal.
NOTES:
Roof Curb
Utility Curb
Gasketing (apply to perimeter
and cross members after
duct
installation)
1.
OVERLAP AND POSITION JOINTS IN P.V.C. RUBBER GASKET.
2.
AIR SEALS - APPLY P.V.C. RUBBER LAST TO INSURE THERE IS ADEQUATE P.V.C. FOR WATER SEAL.
3.
USE TYPICAL SEALING METHODS TO PREVENT
AIR
DUCT LEAKAGE AT CURB-DUCT JOINT
Figure 4. Applying P.V.C. Rubber Tape Gasketing
Installer’s Guide
Page 5
Hold Down Brackets
Position on the BAYUTIL-- Extension for Unit Placement
The 2 Hold Down Brackets (packed with the extension) are used to secure the unit to the roof curb.
Figure 5. Hold Down Brackets
HOLD DOWN
BRACKET
SEE VIEW A
HOLD DOWN
BRACKET
SEE VIEW A
PACKAGED UNIT
ROOF CURB
BAYCURB050
BAYCURB051
CURB ACCESSORY
BAYUTIL101
BAYUTIL102
HOLD DOWN BRACKET
(2-PLACES)
#12 X 3/4” LONG DRILL
SCREWS - KIT SUPPLIED
(3 PER BRACKET)
Installer’s Guide
About Trane and American Standard Heating and Air Conditioning
Trane and American Standard create comfortable, energy ecient indoor environments for residential applications.
For more information, please visit www.trane.com or www.americanstandardair.com
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specications without notice. We
are committed to using environmentally conscious print practices.
© 2023
18-HE38D11-3B-EN 14 Jul 2023
Supersedes 18-HE38D11-3A-EN (July 2020)
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Trane BAYUTIL102 is a utilities extension designed to provide easy access to electrical power, low voltage control, gas piping, and condensate drain connections for single packaged units mounted on a matching full perimeter curb. It features knockouts for condensate drain and gas piping connections, a rubber bushing for the low voltage electrical opening, and supports for supply and return duct connections.
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