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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 re-
move power from the Economizer module before starting
work. Pay particular attention to verifying the power con-
nection (24 Vac).
Power Up — After the W7220 module is mounted and wired,
apply power.
Initial Menu Display — On initial start up, Honeywell dis-
plays 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 ad-
vanced settings are restored after any power loss or interrup-
tion.
NOTE: All settings are stored in non-volatile flash memory.
Status — Use the Status menu (see Table 7) to check the pa-
rameter values for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 22.
Checkout Tests — Use the Checkout menu (on page 27) 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 22.
To perform a Checkout test:
1. Scroll to the desired test in the Checkout menu using
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 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 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.
If one or more alarms are present and there has been no key-
pad 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) button to complete the action
and return to the previous menu.
NOTE: If the alarm still exists after you clear it, it is redis-
played within 5 seconds.
Failure to follow this caution may result in damage to
equipment. Be sure to allow enough time for compressor
startup and shutdown between checkout tests so that you
do not short-cycle the compressors.
33
CAUTION
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