19
For this application with the 2--speed supply fan option,
note that parameters EQUIPMENT, AUX2I and FAN
TYPE have required settings. Check that these parameters
are set at these required settings:
EQUIPMENT must be CONV
AUX2I must be W
FAN SPEED must be 2SPEED
Press the
(EXIT) button to exit the SYSTEM SETUP
menu and return to top level menu. Scroll down to ADV
SETUP menu and press
(ENTER) button to enter this
menu. Scroll down through the list of parameters and
adjust settings as required. Be sure that the message
CHANGE STORED appears with every change in
parameter setting.
Press the
(EXIT) button to exit the ADV SETUP menu
and return to top level menu. Scroll down to SETPOINTS
menu and press
(ENTER) button to enter this menu.
Scroll down through the list of parameters and adjust
settings as required. Be sure that the message CHANGE
STORED appears with every change in parameter setting.
SETPOINT Defaults — The default setpoint values
represent many years of successful experience with
economizing systems. Any changes that represent
significant deviations from the default values should be
well considered.
DCV SETPOINT — The default value for DCV SET is
1100 ppm. It is recommended that this setpoint be
adjusted down to 500 ppm (or CO
2
level of outdoor air
plus 100 ppm, whichever is higher) to permit an earlier
initiation of the DCV mode as space occupancy increases.
CHECKOUT
For checkout, review the Status of each configured
parameter by observing the scrolling display from the
Screensaver mode or by entering the STATUS menu.
Use the Checkout menu (see Table 2 on page 8) to test
the damper operation and any configured outputs. Only
items that are configured are shown in the Checkout
menu.
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
installation or at any time during the operation of the
system as a test that the system is operable.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage.
Be sure to allow enough time for compressor startup
and shutdown between checkout tests so that you do
not short--cycle the compressors.
CAUTION
!
Status
Use the STATUS menu (see page 5) 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
connected to the W7220). See page 7 for this menu.
Resetting All Defaults
Menu SYSTEM SETUP contains parameter 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 the 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 outage or brownout), the
W7220 controller module begins a 5 minute power up
delay before enabling mechanical cooling.
Power Loss (Outage or Brownout)
All setpoints and advanced settings are restored after any
power loss or interruption.
NOTE: If the 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 SAT sensor which will
alarm immediately.
LLECON--02SI
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