Replacement Of W859F With W7220A1000 (Jade Tm ) And M7285A1045 - Honeywell Design and Application Technical Reference Manual

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