44
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 system
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 betwee n checkout tests so that you do
not short--cycle the com pressors.
CAUTION
!
Status —
Use the STATUS menu (see pages 30 and 31) to check the
parameter values for the various devices and sensors
configured.
Calibration of Sensors —
There are up to six sensor calibration settings available in
the ADV SETUP menu (depending on which sensors are
connec ted to the W7220). See page 32 for this menu.
Resetting All Defaults —
Menu SYSTEM SETUP contains pa rameter FACTORY
DEFAULT. This parameter will reset all setpoints back to
factory default values.
To reset all values to defaults, scroll to the SYSTEM
SETUP menu, enter the menu and scroll to parameter
FACTORY DEFAULT. Enter this parameter and change
the display value from NO to YES. Press ENTER
.
After resetting all values, scroll up in SYSTEM SETUP to
ensure t he three parameters requiring special values for
use with 2--speed fan system are correct.
Troubleshooting
Power Up Delay—
Upon power up (or after a power out age or brownout) the
W7220 controller module begins a 5--minute power up
dela y before enabling mecha nical cooling.
Power Loss (Outage or Brownout) —
All setpoints and advance d settings are restore d after any
power loss or interruption.
NOTE: If the powe r goes below 18 Vac, the W7220
controller module assumes a power loss and the 5 --minute
power up del ay 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
operat ional. The exc eption 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. The list of
ala rms included in Table 5 (see page 33) is not a compl ete
list of available alarm messages. Each sensor has alarms
for temperature, humidity and enthalpy. The list of
possible ala rms will vary from unit to unit as different
sensors are connected.
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) button to complete the
action and return to the previous menu.
NOTE: If the alarm still exists after you clear it, it is
redisplayed within 5 seconds.
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