750-265 48
ANNUNCIATOR
The Annunciator section monitors the status of a series string
of limits, control, and interlock contacts to enhance fault and
status messages.
The Annunciator’s 8 inputs (A1–A8) along with the Interlock,
LCI, and Pre Ignition Interlock inputs, provide a total of 11
monitored contact components.
The Annunciator function can be set up as:
• Disabled: Not used at all
• Fully enabled: Status of all inputs shown, even those
designated unused.
• Enabled with unused designated terminals hidden.
Each Annunciator input has three parameters:
• Long Name: 20 characters long; name is displayed when
viewing the Annunciator status from a system display like
the S7999B.
• Short Name: 3 characters long; used for status viewing by
more limited local displays, like the S7910. The short name
can also be used as part of a lockout or hold message.
• Location: Each Annunciator terminal location may be
designated:
• LCI: Monitored after the demand is present
throughout the Run period, and following the
system action designated by LCI setup parameter
(Lockout or Recycle).
• ILK: Monitored with the demand input (LCI) and
annunciate which interlock is causing the system to
remaining in “Standby”.
• PII: Interlocks (typically indicating the gas valve
status) monitored from the end of a call for heat, up
to the Ignition Trial Period of the next demand cycle
(including standby) then ignored during Run.
• Unused: not used
• Other: Used to Monitor a circuit, not related to any
of the above.
The input terminal names (Interlock, LCI, Pre Ignition
Interlock) can be renamed with a long (20 character) and
short (3 character) name that better describes their purpose.
This only applies for monitoring. System demands for
annunciation (lockout or standby hold for example) will
retrieve the Interlock, LCI or Pre Ignition Interlock name for
annunciation.
Three Annunciator terminals may already be assigned
functions based on the system parameter setup:
• A1: Will be Interrupted Air Switch (IAS) if the parameter is
enabled.
• A7: Will be High Fire Switch (HFS) if the parameter for
Purge Rate Proving parameter is enabled
• A8: Will be Low Fire Switch (LFS) if Lightoff Rate Proving
parameter is enabled.
Annunciator Example
Fig. 23 is an example of wiring to the Annunciator terminals
and names that have been assigned for this example.
Note that the assigned terminals (LCI, ILK, and PII) are the
last interlocks in their category.
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