Honeywell Design and Application User Manual

Section 17 - Retrofit and Upgrades
63-8594-02 Honeywell Economizers 196
The M7285A1045 is powered with transformer connected to T1 and T2 (L1 and L2 as shown
above). The MAT internal to the W859 is replaced with a C7250A1001 sensor connected to the
MAT on the W7220. Add a C7400S1000 S-Bus sensor for the outdoor air changeover. Use
separate transformers for the motor and for W7220. The W7220 must be earth grounded.
There is no longer a need for Minimum Position and Changeover Curve (A, B, C, D)
potentiometers. The changeover curve boundaries and minimum position are set using the LCD
display menu item "Setpoints" and the 4 buttons on JADE
TM
.
For programming JADE
TM
refer to the Installation Instructions (62-0331).
Old Sensor Description New Sensor
C7046A Discharge Air C7400S1000
C7150B Mixed Air C7250A1001
C7400 Solid State Enthalpy C7400S1000
C7660 Solid State Dry Bulb C7250A1001

Honeywell Design and Application Specifications

General

Dimensions	Varies by model
Weight	Varies by model
Programming Language	Function Block Diagram
Communication Protocols	Ethernet, Modbus
Application	Industrial Automation
Input Voltage	24 VAC/DC, 120/240 VAC
Enclosure Rating	IP20
Controller Type	Programmable Logic Controller (PLC)