Wiring Guides - Honeywell PRESTIGE THX9321 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—03
69-2490_B.indd 16
Transformer
R
120
24
C
VAC VAC
Transformer
R
120
24
C
VAC VAC
16
Rooftop Unit
O/B N Y1 Y2 AUX AUX 2
O/B L/A Y Y2 AUX AUX 2
1 2
Thermostat/EIM
MCR32959
Rooftop Unit
N Y1 Y2 W1 W2
A Y Y2 W W2
1
Thermostat/EIM
MCR32955
G
G
G
G
7/13/2011 1:42:00 PM