Wiring Guides - Honeywell THX9321 Prestige 2.0 System Installation Manual

System Installation Guide
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.
W7220 Economizer Module
(See wiring guidelines provided with the product)
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
Typical wiring of a W7220 Economizer Module for a conventional system, using a
Prestige THX9321 thermostat or Equipment Interface Module.
W7220 Economizer Module
(See wiring guidelines provided with the product)
SD-O/B
OCC
E-GND
AUX
Y2I
Y2O
Y1I
Y1O
C
R
"A" or "L/A" terminal must be configured for Economizer in the installer setup (ISU 2220).
1
These terminals are powered by the cooling transformer (Rc terminal).
2 Terminal AUX 2 is present only on the Equipment Interface Module.
69-2490—05
Transformer
120
24
VAC
VAC
Transformer
120 24
VAC
VAC
16
Rooftop Unit
O/B N Y1 Y2
O/B L/A Y Y2
1
R
Thermostat/EIM
C
Rooftop Unit
N Y1 Y2
A Y Y2
1
R
Thermostat/EIM
C
AUX AUX 2 G
AUX AUX 2 G
2
MCR32959A
W1 W2 G
W W2 G
MCR32955A