Section 17 - Retrofit and Upgrades
195 Honeywell Economizers 63-8594-02
Replacement of W859F with W7220A1000 (JADE
TM
)
and M7285A1045
Step by step guide to assist you in successful replacement of the W859 economizer with a
W7220 JADE
TM
economizer controller and M7285A1045 motor:
1. Remove all wires from the W859. Mark each wire with the terminal designation (e.g., H205
violet in, violet out,T1, T2 etc.) as it is removed from the W859.
2. Remove the W859 including motor and using the same mounting holes mount the
M7285A1045 motor in its place.
3. Mount JADE
TM
on the inside of the Rooftop unit where it will be easy to read the display and
to change the settings.
4. Terminate wires removed from the W859 to the JADE
TM
:
*Sensor to be changed
1. Replace T874 thermostat with a two stage commercial programmable thermostat.
2. Add earth ground to the W7220 JADE
TM
controller.
W859F wire termination W7220 wire termination
H205 terminal 3 = violet in Y1-In
H205 terminal 3 = violet out Y1-Out
H205 terminal 1 = black/blue Y2-In
H205 terminal 1 = black/red Y2-Out
R (use system transformer)
C (use system transformer)
Internal MAT MAT*
Internal OA changeover OAT or S-Bus*
R ACT COM
W ACT (2-10V)
B Not terminated to W7220
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