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THX9321 PRESTIGE
®
2.0 AND THX9421 PRESTIGE
®
IAQ 2.0 WITH EIM
68-0311—01 116
Economizer Module Wiring Diagrams
Typical wiring of a W7220 Economizer Module for a heat pump system, using a Prestige THX9321 thermostat or Equipment
Interface Module.
Fig. 235. Wiring a W7220 Economizer Module for a heat pump system.
Typical wiring of a W7220 Economizer Module for a conventional system, using a Prestige THX9321 thermostat or Equipment
Interface Module.
Fig. 236. Wiring a W7220 Economizer Module for a conventional system.
1 “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)
2 Terminal AUX 2 is present only on the Equipment Interface Module.
120
VAC
O/B N Y1 Y2 AUX AUX 2 G
24
VAC
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
Rooftop Unit
Transformer
O/B L/A Y Y2 AUX AUX 2 G
Thermostat/EIM
R
C
W7220 Economizer Module
(See wiring guidelines provided with the product)
21
M32959A
120
VAC
NY1Y2W1W2G
24
VAC
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
Rooftop Unit
Transformer
AYY2WW2G
Thermostat/EIM
R
C
W7220 Economizer Module
(See wiring guidelines provided with the product)
1
M32955A