Section 17 - Retrofit and Upgrades
197 Honeywell Economizers 63-8594-02
Replacement of W957G with W7220A1000 (JADE
TM
)
and M7285A1045
Step by step guide to assist you in successful replacement of the W957 economizer with a
W7220 JADE
TM
economizer controller and M7285A1045 motor:
1. Remove all wires from the W957. Mark each wire with the terminal designation (e.g.,
1,2,3,4, T0, T2 etc.) as it is removed from the W7459.
2. Remove the W957 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 W957 to the JADE
TM
:
* Sensor to be changed
5. Add a two stage commercial programmable thermostat.
6. Use separate transformers for the motor and for W7220. Add earth ground to the W7220
JADE
TM
controller.
W957G wire termination W7220 wire termination
1 Y1-In
2 Y1-Out
3 Y2-In
4 Y2-Out
T0 = power hot R (use system transformer)
T2 = power common C (use system transformer)
S1 and S2 MAT*
SR and + RAT (S-Bus)
++ and So OAT or S-Bus*
Z and Y
Not needed on JADE
TM
P1 = enthalpy curve set Use menu, LCD and buttons to set
P2 = temperature range set
Not needed on JADE
TM
P3 = Calibration pot
Not needed on JADE
TM
P4 = throttling range pot
Not needed on JADE
TM
P5 = Minimum position pot Use menu, LCD and buttons to set
R ACT COM
W ACT (2-10V)
B Not terminated to W7220
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