System Installation Guide
16
69-2490 —03
Economizer Module wiring guides

TypicalwiringofaW7220EconomizerModuleforaheatpumpsystem,usinga

PrestigeTHX9321thermostatorEquipmentInterfaceModule.

TypicalwiringofaW7220EconomizerModuleforaconventionalsystem,usinga

PrestigeTHX9321thermostatorEquipmentInterfaceModule.

1
2
“A” or “L/A” terminal must be configured for Economizer in the installer setup (ISU 2220).
These terminals are powered by the cooling transformer (Rc terminal).
Terminal AUX 2 is present only on the Equipment Interface Module.
120
VAC
NY1Y2W1W2G
24
VAC
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
Rooftop Unit
Transformer
AYY2 WW2G
Thermostat/EIM
R
C
W7220 Economizer Module
(See wiring guidelines provided with the product)
1
MCR32955
120
VAC
O/BNY1 Y2 AUX AUX 2G
24
VAC
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
Rooftop Unit
Transformer
O/B L/A YY2 AUX AUX 2G
Thermostat/EIM
R
C
W7220 Economizer Module
(See wiring guidelines provided with the product)
21
MCR32959
69-2490_B.indd 16 7/13/2011 1:42:00 PM