Honeywell S7800A Installation Manual page 15

Step Operation
1.
Press keys to access Diagnostic
Information.
2. Press key to Access Diagnostic
Information.
3. Continue display of Diagnostic
Information.
4. Continue through remaining Diagnostic
Information display following step 3 as
required.
5. Press the key to return to the first
level of Diagnostic Information data
prompt or to other selectable messages.
SERVlCE NOTE: If the Keyboard Display Module screen is
scrambled, remove and reinstall the Keyboard
Display Module and reset the 7800 SERIES Relay
Module.
SERVlCE NOTE: Reset the 7800 SERIES Relay Module by
pressing the reset push button on the relay module or
pressing a remote reset push button wired through
the Keyboard Display Module, Data ControlBus™
Module or Remote Reset Module. A power-up reset
will cause an electrical reset of the 7800 SERIES
Relay Module but will not reset a lockout condition.
Lockout Messages
When the 7800 SERIES is locked out, it displays a repeating
cycle of messages unless the Call Service Feature is Active.
Then the Fault message is displayed followed by the Customer
Service message. The Fault History is NOT available if the Call
Service is Active. See Table 7. There are four states in the
cycle:
1. State 1 (Fig. 16). A first state message display lasts six
seconds. First line displays the word LOCKOUT followed
by the fault code number and possibly a lower case letter
if an Expanded Annunciator is connected. The letter
corresponds to the first-out code supplied by the
Expanded Annunciator. The lockout reason
corresponding to the fault code number is displayed on
the second line, highlighted by asterisks on each side.
LOCKOUT 23p
*Airflow Sw.*
Fig. 16. Lockout message, State 1.
Table 6. Accessing Historical and Diagnostic Selectable Messages.
Press
-
M22877
7800 SERIES S7800A KEYBOARD DISPLAY MODULE
Display
STANDBY Use the Down/Up SCROLL keys to access the
Diagnostic Info> selectable message. The second line will display
Diagnostic Information.
STANDBY Use the Change Level key to access the
Diagnostic Info> Diagnostic Information.
STANDBY ¡¿ DI Push the SCROLL key to scroll to the next
Diagnostic Message.
Device RM7800<
- -
STANDBY Another display can be selected or discontinue
Diagnostic Info> accessing Diagnostic Information review.
2. State 2 (Fig. 17). Display of the second state message
lasts two seconds.
Condition at the
time of lockout ...
Fig. 17. Lockout message, State 2.
3. State 3 (Fig. 18). Display of the third state message lasts
three seconds. It is a replica of the burner status as it
existed at the time of the lockout. The second line is
blank if the burner status at the time of lockout did not
include a preemptive message (in parentheses) for the
second line.
Fig. 18. Lockout message, State 3.
15
Comments
PURGE
(Airflow Sw.)
M22878
M22879
65-0090-6