Honeywell Design and Application - Page 132

Section 11 - W7220 JADE™ Economizer Module
63-8594-02 Honeywell Economizers 126
Table 11. Enthalpy Operation With DCV (CO
2
sensor) - 2 Speed Fan.
a
With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on 2nd stage of mechanical cooling Y2 –O after
the delay if the call for Y1-I and Y2-I have not been satisfied.
b
With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed
fan to try to satisfy the call for second stage cooling by turning on the fan to high and opening the OA damper
100% before the first stage mechanical cooling is enabled.
JADE™ Enthalpy Changeover Boundaries
The W7220 JADE™ economizer has new single enthalpy setpoints, it does not use the A,B,C,D
and E enthalpy curves. Figure 13 and table 12 show the new boundary curves. There are 5
boundaries (setpoints ES1 through ES5), which are defined by dry bulb temperature, enthalpy
and dew point.
DCV
OA Good to
economize? Y1-I Y2-I FAN SPD Y1-O Y2-O Occupied Unoccupied
Below set No Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 24-v/On 0-v/Off VENTMIN L Closed
On On High 24-v/On 24-v/On VENTMIN H Closed
Yes Off Off Low 0-v/Off 0-v/Off VENTMIN L Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to
Full-Open
Closed to Full-Open
On On High 24-v/On
0-v/Off
a
VENTMIN H to
Full-Open
Closed to Full-Open
Above
set
No Off Off Low 0-v/Off 0-v/Off VENTMIN L to
VENTMAX
Closed
On Off Low 24-v/On 0-v/Off VENTMIN L to
VENTMAX
Closed
On On High 24-v/On 24-v/On VENTMIN H to
VENTMAX
Closed
Yes Off Off Low 0-v/Off 0-v/Off VENTMIN L to
VENTMAX
Closed
On Off Low 0-v/Off 0-v/Off VENTMIN L to
Full-Open
Closed to Full-Open
On On High
DELAY
b
24-v/On
0-v/Off
a
VENTMIN H to
Full-Open
Closed to Full-Open