Trane BAYECON102AA Assembly instructions

Installer’s Guide
September 2022 18-HE39D8-13A-EN
SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating,
and air-conditioning equipment can be hazardous and requires specific knowledge and training. Improperly installed, adjusted or
altered equipment by an unqualified person could result in death or serious injury. When working on the equipment, observe all pre-
cautions in the literature and on the tags, stickers, and labels that are attached to the equipment.
Model: Used with:
BAYECON101AA/AB/AC 2/4TC*, WC*, YC*, DC* *018-036
BAYECON102AA/AB/AC 2/4TC*, WC*, YC*, DC* *042-060
BAYRLAY004A (Relay required in WC* Units)
Note: “Graphics in this document are for
representation only. Actual model may differ
in appearance.”
Down Discharge Economizer and Rain Hood

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INSTALLER’S GUIDE
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ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT-This Document is customer property and is to remain with this unit. Please return to service information pack
upon completion of work.
Install Economizer Kit
1. Remove Power
Disconnect and verify that power is off.
2. Remove Access Panels
Remove these four (4) access panels (see Figure 3, page 3):
• Control/Heat access panel
• Blower access panel
• Coil access panel
• Horizontal Return Air panel (discard or store)
3. Install Economizer Assembly
General
The economizer is a multi-damper design. It is installed in the
return air stream and is connected to the unit low voltage supply
through wire leads. The economizer is fully accessible through the
Coil access panel.
IMPORTANT: The Economizer installation requires that you
install an air filter rack ordered separately. Use:
BAYFLTR101B for 2/4YC*, WC*, TC*, DC* *018-3036
BAYFLTR201B for 2/4YC*, WC*, TC*, DC* *042-3060.
When the economizer is installed in WC* models, relay accessory
kit BAYRLAY004A is required. Refer to the drawing on page 9 to
make your relay wiring connections in the Control Box.
Identify Economizer Kit Contents
Refer to Figures 1 and 2 on page 3 to identify the kit contents.
Inspect Contents
You must report damage and make claims to the transportation
company immediately. Report missing parts to your supplier
immediately and replace with authorized parts only.
!WARNING:
HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING
1. The economizer ships with the return air damper folded
up to allow the assembly to fit through the Coil opening
in the side of the unit, see Figures 1 and 2 on page 3.
Insert the economizer assembly into the unit through the
Coil access panel opening. See Figure 4 on page 4.
2. Swing the return air damper section down so that it rests
on the bottom of the unit. The economizer will sit com-
pletely over the return air opening in the bottom of the
unit. See Figures 5 on page 5. Screw the economizer
assembly together with one assembly screw in the side
of the economizer. Tighten the linkage rod between the
return air dampers.
3. Insert 2 screws through the holes in the front face of the
unit and into the matching attachment holes in the
economizer assembly. See Figure 6 on page 5.
4. Insert a screw through the pre-punched hole in the side
flange of the return air damper and into the mating hole
in the economizer assembly and tighten. See Figure 5
on page 5.
ELECTRIC SHOCK HAZARD
OPEN AND LOCK OUT ALL UNIT DISCONNECTS PRIOR TO
ACCESSORY INSTALLATION OR UNIT MAINTENANCE, TO PRE-
VENT INJURY OR DEATH FROM ELECTRICAL SHOCK OR CON-
TACT WITH MOVING PARTS.
WARNING!
SAFETY HAZARD
DO NOT REMOVE END COVERS FROM ECONOMIZER ACTUATOR;
THE SPRING-RETURN ASSEMBLY MAY RELEASE AND CAUSE
PERSONAL INJURY.
!WARNING
Use care when inserting the economizer in the return air compart-
ment, to prevent damaging the foil faced insulation.
CAUTION
!

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INSTALLER’S GUIDE
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Mixed Air Sensor
Economizer Assembly
Rainhood Assembly
Figure 1. Economizer Kit Components
YC*, TC*, WC*, DC* *018A to *036
Figure 2. Economizer Kit Components
YC*, TC*, WC*, DC* *042A to *060
Figure 3. Remove Panels
DC, TC, WC,
or YC Unit
Horizontal
Return Air
Panel
Down Flow
Return Air
Panel
Blower Access Panel
Control Box Access
Panel
Coil Access
Panel
Mixed Air Sensor
Economizer Assembly
Rainhood Assembly
Mist Eliminator
(Filter)
Mist Eliminator
(Filter)
Return Air Damper
Flange Screw and
two (2) Mixed Air
Sensor
Sheetmetal Screws
(not shown)
Top Sealing
Flange
Return Air Damper
Flange Screw and
two (2) Mixed Air
Sensor
Sheetmetal Screws
(not shown)

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INSTALLER’S GUIDE
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4. Install Rain Hood Assembly
1. Locate the rainhood assembly, which includes the relief
damper and the mist eliminator. The back of the hood side
mating flanges need to be gasketed (gaskets included in
kit). Loosen the right two (2) screws on the unit’s top sealing
flange above the economizer. See Figure 3 on page 3.
2. Slide the top flange of the hood up underneath the unit’s top
sealing flange. Drive two self tapping screws into the keyhole
openings on the side flanges of the hood. Tighten the two (2)
screws on the top sealing flange and the screws on the hood
side flanges. See Figures 8 and 9.
5. Mount Mixed Air Sensor
1. Mount the Mixed Air sensor (with wiring) to the left Blower
partition using two sheetmetal screws. See Figure 10. The
male tabs on the two (2) yellow wires will connect to the
Economizer wiring harness in a later step.
2. Enthalpy and/or CO2 Sensor-If used, install these
options at this time per instructions provided.
Figure 4. Insert Economizer in Shipping Position
DC, TC, YC, or WC
Unit
Dry bulb outside air
temperature sensor
Insert economizer
in folded shipping
position
Economizer
actuator and
controller
6. Route Main Wiring
1. From the Economizer assembly, pass the wire harness
through the coil grommet. See Figure 10 (view A) on page
8. Continue routing the harness behind the Compressor
compartment and into the Blower compartment.
2. Continue routing the remaining harness through the grom-
met in the Control Box partition and into the Control Box.
7. Complete Installation
1. In the Control Box, complete the wiring connections per the
appropriate wiring diagram on pages 9 and 10. Secure all
wires so that there is no interference with any moving parts
in the unit.
2. Power the economizer and run the checkout procedure on
page 13. Make desired adjustments to the controller setting
the minimum occupied damper position, the outside air
setting (if enthalpy used), and the IAQ sensor (if used).
3. Replace the unit Coil access panel, the Blower access
panel, and the Control/Heat access panel.

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INSTALLER’S GUIDE
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Figure 5. Swing Down and Set Economizer Return Air Damper
Economizer
2.) Insert Assembly
screw
1.) Swing
Down
Return Air
Damper
Return Air Damper
3.) Tighten Linkage rod
Figure 6. Start Economizer’s Front Mounting Screws
Economizer outline
Install two (2)
screws into holes.
Leave extended
from unit 1/2”.
Economizer and
Return Air Damper
Apply gasket between damper assembly and hood.

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INSTALLER’S GUIDE
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1. Loosen the two
(2) screws to allow
hood to slide under
top sealing flange of
the unit.
Detail
Economizer rain
hood
Figure 7. Mounting Rain Hood
Top flange of hood
slides under HVAC
unit’s top sealing
flange HVAC unit’s top
sealing flange
Hood HVAC unit
2. Drive six (6) self
tapping screws into the
keyhole openings
on each side of hood
flanges.
Unit’s top sealing
flange
3. Tighten the two
(2) top screws and
the two (2) side
screws.

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INSTALLER’S GUIDE
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Figure 8. Rain Hood, Economizer, and Filter
Figure 9. Mount Mixed Air Sensor in Blower Compartment
View ‘A’ Approximate
Mounting Dimension
See View ‘A’
Return Duct Roofcurb
Relief damper
Mist eliminator
(filter)
Economizer rain
hood
Outside air
dampers
Return air
dampers Required filter
kit, order separately
Mount the Mixed Air
Sensor to the partition
using two (2) sheetmetal
screws. See View A for
approximate positioning.
1.80”
2.82”
A
Economizer Unit Application
Models A
BAYECON101AA/AB/AC 2/4TC*,WC*,YC*,DC*
*018-036 20.125”
BAYECON102AA/AB/AC 2/4TC*,WC*,YC*,DC*
*042-060 24.375”

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INSTALLER’S GUIDE
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Figure 10. Main Wire Harness Routing
1.) From Economizer-
Assembly, Pass Wire
Harness Through Coil
Grommet. See View A.
View ‘A’
2.) Continue
Routing Behind
Compressor
Compartment
and into Blower
Compartment.
3.) Pull the two (2) Mixed Air
Sensor Wires (with female
quick connects) from the
Harness and Route Down
Near the Mixed Air Sensor.
Connect to sensor
pigtail wire leads.
Location of
Mixed Air Sensor
4.) Continue Routing
the Remaining Harness
Through the Grommet and
into the Control Box.
Coil Grommet

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INSTALLER’S GUIDE
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A A A A
Figure 11. TC*/YC* Economizer Connection Diagram
Wiring Diagram for Economizer Using a Honeywell W7459 Logic

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INSTALLER’S GUIDE
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Figure 12. WC* Economizer Connection Diagram
Wiring Diagram for Economizer Using a Honeywell W7459 Logic