39
Fig. 53 — Single Enthalpy Curve Boundaries
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: For information about menu navigation and use of the
keypad see Interface Overview on page 31.
Power Up
After the W7220 module is mounted and wired, apply
power.
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: All settings are stored in non-volatile flash memory.
Status
Use the Status menu (see Table 9) to check the parameter
values for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 31.
Checkout Tests
Use the Checkout menu (see page 35) to test the damper
operation and any configured outputs. Only items that are
configured are shown in the Checkout menu.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 31.
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 and 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 in-
stallation or at any time during the operation of the system as
a test that the system is operable.
Troubleshooting
Alarms
The economizer module provides alarm messages that dis-
play 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 de-
vices (e.g. sensors, actuator) to become operational. The excep-
tion 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 dis-
plays 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 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 dis-
plays.
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.
ECONOMIZING
AVAILABLE
NOT AVAILABLE
ENTHALPY
RA HUM (%RH)
RA TEMP
TEMPERATURE
ABSOLUTE HUMIDITY
ES5
ES4
ES3
ES2 ES1
HL
P1
(T,RH)
P2 (T,RH)
SINGLE ENTHALPY
DUAL ENTHALPY
HIGH LIMIT
WARNING
Failure to follow this warning could result in personal injury,
property damage, or death.
Before performing service or maintenance operations on
unit, always turn 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 an amperage listed on the unit rating plate.
If any wiring changes are required, first be sure to remove
power from the Economizer module before starting work.
Pay particular attention to verifying the power connection
(24 Vac).
CAUTION
Failure to follow this caution may result in damage to equip-
ment. Be sure to allow enough time for compressor start-up
and shutdown between checkout tests so that you do not
short-cycle the compressors.
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