Section 11 - W7220 JADE™ Economizer Module
63-8594-02 Honeywell Economizers 128
• The Y2 In call will be satisfied with the
damper 100% open and fan on high speed
and the call will turn off
OR
• If the call for additional cooling in the space
has not been satisfied then the first stage of
mechanical damper cooling will be enabled
through Y1 Out or Y2 Out.
Power Up Delay
Upon power up (or after a power outage or
brownout), the W7220 controller module
begins a 5 minute power up delay before
enabling mechanical cooling.
Initial Menu Display
On initial start up, Honeywell displays on the
first line and Economizer W7220 on the
second line. After a brief pause, the revision of
the software appears on the first line and the
second line will be blank.
Power Loss (Outage or Brownout)
All setpoints and advanced settings are
restored after any power loss or interruption.
NOTE: If power goes below 18 Vac, the
W7220 controller module assumes a
power loss and the 5 minute power-up
delay will become functional when
power returns above 18 Vac.
Alarms
The Economizer module provides alarm
messages that display on the 2-line LCD.
NOTE: Upon power up, the module waits 60
minutes before checking for alarms.
This allows time for all the configured
devices (e.g. sensors, actuator) to
become operational. The exception is
the MA sensor which will alarm
immediately.
If one or more alarms are present and there
has been no keypad activity for at least 5
minutes, the Alarms menu displays and cycles
through the active alarms. You can also
navigate to the Alarms menu at any time.
Clearing Alarms
Once the alarm has been identified and the
cause has been removed (e.g. replaced faulty
sensor), the alarm can be cleared from the
display.
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