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INSTALLER’S GUIDE

    

Be certain to cap the ends of the cut YL/RD and YL wires that 

are not being connected to an accessory or the unit to reduce 

the risk of a short.

CAUTION

4. Install Economizer Assembly

1.  A

pply two gaskets to horizontal economizer mounting  

flanges. See Figure 2 on page 3.

2a. 

Small Cabinet - BAYECON203AA/AB/AC

 

(*WCZ, YCZ, DCZ - 024, 036)

 

Set the horizontal economizer over the horizontal return air 

opening on the unit. The notches in the bottom flange of the 

economizer clear the two existing screws below the return 

air opening of the unit.

2b. 

Medium Cabinet - BAYECON204AA/AB/AC

 

(*WCZ, YCZ, DCZ - 048, 060)

 

A

pply a gasket to the economizer and slide the topflange of 

the economizer under the lip between the top and bottom 

sections of the unit. Mate the notches on the top flange of 

the economizer with the existing screws between the top and 

bottom sections of the unit. The notches on the bottom flange 

of the economizer clear the two existing screws below the 

return air opening of the unit. 

3.  Drill three (3) 9/64” holes through the mating holes in the top 

flange of economizer and into the unit. Then, drive three (3) 

#10 sheet metal screws to secure the top.

4.  Drill three (3) 9/64” engagement holes on each side of the 

economizer. Then, drive three (3) #10 sheet metal screws 

into each side of the economizer to the unit.

5.  Mount the Mixed Air sensor to the left Blower partition 

using two sheet metal screws. See Figure 4, page 4. The 

Yellow and Yellow/Black wires will connect to the Econo

-

mizer wiring harness in a later step. Install any economizer 

options at this time per instructions provided with the sen-

sor.

6.  A

pply a gasket to the Rain Hood flanges. See Figure 2, page 

3.

7.  Place the Rain Hood over the horizontal return air opening 

of the economizer. See Figure 2, page 3. Use the #10 sheet 

metal screws provided to attach the hood to the economizer.

8.  Route the main wiring harness. From the Economizer as-

sembly, route the main wiring harness to the Mixed Air sensor 

and to the Control Box. See Figure 3, page 4.

9.  Connect the two (2) Mixed Air Sensor wires (pulled from har-

ness) to the mating pigtail wires (with female quick connects) 

from the Mixed Air Sensor.  

10.  In the Control Box, locate the ICMC Board in the upper left 

hand corner of the Control Box. Find the YL/RD and YL wires 

in the 12 pin connector. Leaving enough length of these wires 

so that the ends going to the ICMC Board can be stripped, 

cut these wires in two. Strip the cut end of the wires going 

to the ICMC Board and connect to economizer wires as per 

hookup diagrams on pages 6 and 7. Cap the ends of the 

Yellow and Yellow/Red wires not being hooked up. Secure 

all wires with wire ties so that there is no interference with 

any moving parts in the unit.

11.  In the Control Box, complete the wiring connections per the 

appropriate wiring diagram on pages 6 and 7. Secure all 

wires so that there is no interference with any moving parts 

in the unit.

12.  Attach the return duct to the economizer.
13.  P

ower the economizer and run the checkout procedure on 

page 8. Make desired adjustments to the controller: set the 

minimum occupied damper position, set the outside air (if 

enthalpy used).

14.  Replace the unit Coil access panel, the Blower access panel, 

and the Control Box access panel.

Sequence Of Operation - Units Equipped With 

Honeywell W7459 Logic

NOTE: 

 A (G) signal is required for the economizer to operate. 

As shipped, the economizer will not operate when there is a 

signal for Heating Modes utilizing gas heat. 

Fan Only (G):  

When the thermostat sends a signal for fan only 

(G), the economizer will open to the minimum position setting 

regardless of the outdoor air conditions and the indoor blower 

will operate at approximately 50% airflow.

Heating (W1), (W2), (Y1, Y2 on Heat Pump or Dual Fuel 

Models):

  When the thermostat sends a signal for auxiliary heat 

(G) +(W1) or first stage heat (G) + (Y1,Y2), the economizer 

will open to the minimum position setting. When the ambient 

temperature may be below 70F, the economizer will not fully 

open to the economizing position, when there is a signal for 

heat. In order to receive fresh air and open the dampers to the 

minimum position setting, you must provide a G signal to the 

unit from the thermostat or comfort control being used.

FREE COOLING NOT AVAILABLE:  

When the outdoor air 

conditions are not sufficient for “Free Cooling” the Economizer 

will open to the minimum position setting only and the unit will 

function

.

FREE COOLING AVAILABLE:

1

st

  Stage Cooling (Y1) + (O for Heat Pumps and Dual Fuel 

models):  

When outdoor air conditions are sufficient for “Free 

Cooling” and the thermostat sends a signal for 1st stage cooling 

(G) + (Y1) + (O for Heat Pumps and Dual Fuel models), the 

economizer will modulate accordingly and the indoor blower will 

run at approximately 70% airflow.

2nd Stage Cooling (Y1) + (Y2) + (O for Heat Pumps and 
Dual Fuel models):  

When outdoor air conditions are sufficient 

for “Free Cooling” and the thermostat sends a signal for 2nd 

stage cooling (G) + (Y1) + (Y2) + (O for Heat Pumps and Dual 

Fuel models), the economizer will modulate accordingly, the 

compressor will operate on low speed, and the indoor blower 

will operate at 100% airflow.

Unit “OFF” Mode

When the economizer is not receiving a 24V signal to the TR 

terminal, or if power is disconnected to the unit, the dampers 

will be fully closed to the outside air and fully open to the return 

air.

NOTE: 

 Free Cooling refers to the process of circulating 

unconditioned outside air, without operating the compressor, to 

cool the structure.

Summary of Contents for BAYECON203AA

Page 1: ...lock out all unit disconnects prior to ac cessory installation or unit maintenance to prevent injury or death from electrical shock or contact with moving parts SAFETY HAZARD Do not remove end covers...

Page 2: ...cure all wires with wire ties so that there is no interference with any moving parts in the unit 11 In the Control Box complete the wiring connections per the appropriate wiring diagram on pages 6 and...

Page 3: ...7 8 15 11 16 11 11 16 15 BAYECON204AA AB AC 26 22 21 32 19 17 11 16 14 11 16 21 3 8 Economizer Logic Module Logic Module not shown located inside economizer Mixed Air Sensor Duct Rain Hood Mist Elimi...

Page 4: ...ting Location of Mixed Air Sensor 1 From economizer assembly pass wire harness through coil Grommet See View A 2 Continue routing behind compressor compartment and into Blower Compartment Coil Grommet...

Page 5: ...5 INSTALLER S GUIDE Figure 5 Mount BAYRLAY006A ICMC Board Relays DFC...

Page 6: ...Figure 6 YCZ Economizer Connection Diagram IMPORTANT Retain this wiring diagram please return this document to service information pack upon completion of work Wiring Diagram for Economizer Using a Ho...

Page 7: ...gure 7 WCZ DCZ Economizer Connection Diagram IMPORTANT Retain this wiring diagram please return this document to service information pack upon completion of work Wiring Diagram for Economizer Using a...

Page 8: ...A A ACCESSORY MODELS BAYECON10 3AA AB AC BAYECON10 4AA AB AC BAYECON20 3AA AB AC BAYECON20 4AA AB AC IMPORTANT Retain this wiring diagram please return this document to service information pack upon c...

Page 9: ...A A ACCESSORY MODELS BAYECON103AA AB AC BAYECON104AA AB AC BAYECON203AA AB AC BAYECON204AA AB AC IMPORTANT Retain this wiring diagram please return this document to service information pack upon compl...

Page 10: ...representative MODEL DRIVE MOTOR OPEN DRIVE MOTOR CLOSED SPRING RETURN M7415 Power to TR and TR1 jumper T and T1 Disconnect jumper at T or T1 and disconnect P or P1 if connected Disconnect power at TR...

Page 11: ...a DC multimeter between terminal So of the W7459A and terminal S of the enthalpy sensor See Fig 11 positive meter lead to terminal S of the enthalpy sensor Multimeter indication is between 3 and 25 m...

Page 12: ...47 3 507 57 2 14 5 000 3 420 59 0 15 4 767 3 373 60 8 16 4 545 3 328 62 6 17 4 335 3 283 64 4 18 4 136 3 239 66 2 19 3 948 3 180 68 0 20 3 769 3 157 69 8 21 3 599 3 118 71 6 22 3 437 3 080 73 4 23 3 2...

Page 13: ...Fan contacts are open Disconnect devices at P and P1 Jumper P to P1 defaults to on board MIN POS potentiometer Place 5 6K ohm resistor across T and T1 Blue sleeve provides input to economizer that the...

Page 14: ...t 45 degrees open Adjust DCV MAX towards CW Motor will move to position set by DCV MAX pot Adjust DCV MAX to fully CCW Motor will drive closed Reconnect jumper to N terminal Adjust DCV MAX and MIN POS...

Page 15: ...plications 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 sp...

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