Carrier WeatherExpert 50LC14, Installation Instructions Manual, Page: 61 / 84

61
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 7 on page 48) to test the damp -
er operation and any configured outputs. Only items that are con -
figured are shown in the Checkout menu.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using
the ▲ and ▼ buttons.
2. Press the (Enter) button to select the item. RUN?
appears.
3. Press the (Enter) button to start the test. The unit
pauses, then displays IN PROGRESS. When the test is
complete, DONE appears.
4. 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.
Status
Use the STATUS menu (see Table 7 on page 48) to check the pa -
rameter values for the various devices and sensors configured.
Calibration of Sensors
Up to six sensor calibration settings are available in the ADV
SETUP menu (depending on which sensors are connected to the
W7220). See Table 7 on page 48 for this menu.
Resetting All Defaults
The SYSTEM SETUP menu contains the 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 DE -
FAULT. Enter this parameter and change the display value from
NO to YES. Press the (Enter) button.
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:
• EQUIPMENT must be CONV
• AUX2I must be W
• FAN SPEED must be 2SPEED
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 en -
abling 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 devic -
es (e.g. sensors, actuator) to become operational. The exception is
the SAT sensor which will alarm immediately.
If one or more alarms are present and there has been no keypad ac -
tivity 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 alarms included in Table 7 on page
48 is not a complete list of available alarm messages. Each sensor
has alarms for temperature, humidity and enthalpy. The list of pos -
sible alarms will vary from unit to unit as different sensors are
connected.
Clearing Alarms
Once the alarm has been identified and the cause has been re -
moved (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 (Enter) button. ERASE? displays.
3. Press the (Enter) button. ALARM ERASED displays.
4. Press the (Menu up/Exit) button to complete the
action and return to the previous menu.
NOTE: If the alarm still exists after clearing it, it is redisplayed
within 5 seconds.
See Table 18 for troubleshooting suggestions.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Be sure to allow enough time for compressor start-up and
shutdown between checkout tests so that you do not short-
cycle the compressors.