Troubleshooting - Bryant 549J Series Installation Instructions Manual

ECONOMIZING
AVAILABLE
NOT AVAILABLE
TEMPERATURE
Checkout
Inspect all wiring connections at the economizer module's termi-
nals, 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.
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).
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 econo-
mizer 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 10) 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 36) to test the damper operation
and any configured outputs. Only items that are configured are
shown in the Checkout menu.
Fig. 48 — Single Enthalpy Curve Boundaries
NOTE: For information about menu navigation and use of the
keypad see Interface Overview on page 31.
To perform a Checkout test:
1.
2.
3.
4.
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.

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 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.
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.
2.
3.
40
SINGLE ENTHALPY
P2 (T,RH)
ES4
ES5
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.
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.
Navigate to the desired alarm.
Press the (Enter) button. ERASE? displays.
Press the (Enter) button. ALARM ERASED displays.
DUAL ENTHALPY
HIGH LIMIT
P1
(T,RH)
ES3 ES2 ES1 HL