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ECONOMIZING
AVAILABLE
NOT AVAILABLE
TEMPERATURE
Checkout
Inspect all wiring connections at the economizer mod-
ule'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 28.
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 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 is 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 8) to check the parame-
ter values for the various devices and sensors configured.
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 28.
Checkout Tests
Use the Checkout menu (see page 33) to test the damper
operation and any configured outputs. Only items that are
configured are shown in the Checkout menu.
Fig. 46 — Single Enthalpy Curve Boundaries
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 28.
1.
2.
3.
4.
stallation or at any time during the operation of the system
as a test that the system is operable.
Troubleshooting
Alarms
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 de-
vices (e.g. sensors, actuator) to become operational. The excep-
tion is the SAT sensor which will alarm immediately.
keypad activity for at least 5 minutes, the Alarms menu dis-
plays and cycles through the active alarms.
Clearing Alarms
been removed (e.g. replaced faulty sensor) the alarm can be
cleared from the display.
1.
2.
3.
37
SINGLE ENTHALPY
P2 (T,RH)
ES5
To perform a Checkout test:
Scroll to the desired test in the Checkout menu using
the ▲ and ▼ buttons.
Press the
(Enter) button to select the item. RUN?
appears.
Press the
(Enter) button to start the test. The unit
pauses and then displays IN PROGRESS. When the
test is complete, DONE appears.
When all desired parameters have been tested, press the
(Menu Up/Exit) button to end the test.
The Checkout tests can all be performed at the time of in-
CAUTION
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.
The economizer module provides alarm messages that
If one or more alarms are present and there has been no
You can also navigate to the Alarms menu at any time.
Once the alarm has been identified and the cause has
To clear an alarm, perform the following:
Navigate to the desired alarm.
Press the
(Enter) button. ERASE? displays.
Press the
(Enter) button. ALARM ERASED dis-
plays.
DUAL ENTHALPY
HIGH LIMIT
P1
(T,RH)
ES4
ES3
ES2
ES1
HL
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