39
After the delay one of two actions will happen:
S The Y2 In call will be satisfied with the damper 100%
open and fan on high speed and the call will t urn off
OR
S If the call for additional cooling in the space has not
been satisfied then the first stage of mechanical cooling
will be enabled through Y1 Out or Y2 Out.
Checkout
Inspect all wiring connections at the economizer module’s
terminals, and verify compliance with the installation
wiring diagrams.
For checkout, review the Status of each configured
parameter and perform the Checkout tests.
NOTE: See “Interface Overview” on page 27 for
information about menu navigation and use of t he keypad.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury, death or property damage.
Before performing service or maintenance operations
on unit, always t urn off main power switch to unit and
install lock(s) and lockout tag(s). Unit may have more
than one power switch. Ensure electrical service to
rooftop unit agrees with voltage and amperage listed
on the unit rating plate.
If any wiring changes are required, first be sure to
remove power from the ec onomizer module before
starting work. Pay particular attention to verifying the
power connection (24 Vac).
!
WARNING
Power Up —
After the W7220 module is mounted and wired, apply
power.
Initial Menu Display —
On initial start up, H oneywell 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.
Status —
Use the Status menu (see Table 7) to check the parameter
values for the various devices and sensors configured.
NOTE: See “Interface Overview” on page 27 for
information about menu navigation and use of t he keypad.
Checkout Tests —
Use the Checkout me nu (on page 32) to te st the damper
operation and any configured outputs. Only it ems that are
configure d are shown in t he Checkout menu.
* All settings are stored in non--- volatile flash memory.
NOTE: See “Interface Overview” on page 27 for
information about menu navigation and use of t he keypad.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using
the the
and buttons.
2. Press the
button to select the item.
3. RUN? appears.
4. Press the
button to start the test.
5. The unit pauses and then displays IN PROGRESS.
6. When the test is complete, DONE appears.
7. When all desired parameters have been tested, press
the
(Menu up) button to end the test.
The Checkout tests can all be performed at the time of
installatio n or at any time during the operatio n of the sy s tem
as a test that the system is operable.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
dama ge.
Be sure to allow enough time for compressor startup
and shutdown bet we en checkout tests so that you do
not short--cyc le the compressors.
CAUTION
!
Troubleshooting
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 devi ces (e.g., sensors, actuator) to become
operat ional. The exce ption is the SAT 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.
To clear an alarm, perform the following:
1. Navigate to the desired alarm.
2. Press the
button.
3. ERASE? displays.
4. Press the
button.
5. ALARM ERASED displays.
6. Press the
(Menu up/Exit) but ton to complete the
action and return to the previous menu.
NOTE: If the alarm still exists after being cleared it, it is
redisplayed within 5 seconds.
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