Economizer Module Wiring Diagrams - Honeywell TH8320R1003 Installation Manual

®
VISIONPRO 8000 WITH REDLINK™

Economizer Module Wiring Diagrams

Typical wiring of a W7220 Economizer Module for a heat pump system, using a VisionPRO with RedLINK thermostat or Equipment
Interface Module.
Typical wiring of a W7220 Economizer Module for a conventional system, using a VisionPRO with RedLINK thermostat or
Equipment Interface Module.
Fig. 339. 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 222). These terminals are powered by the cool-
ing transformer (Rc terminal).
2 Terminal AUX 2 is present only on the Equipment Interface Module.
3 Connect the changeover valve from the roof top unit to the normally open contacts of an isolation relay to prevent feedback into
the economizer module during defrost. If this is not done when the system goes into defrost, it will change the economizer into
cooling mode due to the feedback and open the outside damper while in heating mode.
68-0312—03
W7220 Economizer Module
(See wiring guidelines provided with the product)
AUX2-I
OCC
E-GND
AUX1-O
Y2-I
Y2-O
Y1-I
Y1-O
C
R
Transformer
Fig. 338. Wiring a W7220 Economizer Module for a heat pump system.
W7220 Economizer Module
(See wiring guidelines provided with the product)
AUX2-I
OCC
E-GND
AUX1-O
Y2-I
Y2-O
Y1-I
Y1-O
C
R
Transformer
O/B
3
3 1
O/B L/A
1
R
120 24
VAC C
VAC
A
1
R
120 24
VAC C
VAC
132
Rooftop Unit
Y1 Y2 AUX AUX 2 G
Y Y2 AUX AUX 2 G
2
Thermostat/EIM
MCR34808
Rooftop Unit
Y1 Y2 W1 W2 G
Y Y2 W W2 G
Thermostat/EIM
MCR34810