750-166 1-21
CB780/CB784
OPERATION
TABLE 4—SEQUENCE STATUS DISPLAY INFORMATION (See Fig. 19) (Continued).
NOTE: Normal sequences are in BOLD TYPE, while abnormal sequences are not in bold type.
RUN
Total Cycles 333
M7401
RUN
Total Hours 1332
BURNER CONTROL
SCROLL
MODE
SAVE
SCROLL
MODE
SAVE
BURNER CONTROL
2. Change-Level pushbutton (↔), see Fig. 21.
The Change-Level pushbutton is used to change between
the first hierarchy of selectable messages to a subset of
selectable messages. The Change-Level pushbutton can also
be used to change from a subset message to a first level
selectable message. The symbol (>) located on the second
line in the lower right corner of the VFD represents a first
level hierarchy of selectable messages. The symbol (<)
located on the second line in the lower right corner of the
VFD represents a subset of selectable messages.
3. MODE pushbutton, see Fig. 22.
The MODE pushbutton instantaneously switches the
display from a second-line-selectable message to second-
line-preempted message. The sixty second timeout function
also can be used for this task. The MODE pushbutton will
work only if there is a second-line-preempted message or
lockout message.
Burner Sequence LEDs Energized
POSTPURGE minutes:seconds
↕selectable—message
POWER, PILOT, FLAME, MAIN AND ALARM
Waiting for connection… POWER, PILOT, FLAME, MAIN AND ALARM
RESET/ALARM TEST
↕selectable—message
POWER, PILOT, FLAME, MAIN AND ALARM
Additional sequence status information when an Expanded Annunciator is connected to the relay module, also see
CB 780/CB 784 System Annunciation Diagnostics and Troubleshooting, Bulletin Number CB-7803.
BURNER OFF: T6
(Burner Switch)
POWER,PILOT, FLAME, MAIN AND ALARM
STANDBY HOLD: T6
(Expanded Annunciator hold message)
POWER, PILOT, FLAME, MAIN AND ALARM
STANDBY HOLD: T6
(Circuit Fault)
POWER, PILOT, FLAME, MAIN AND ALARM
KEYBOARD FUNCTIONS
The keyboard contains four pushbuttons and each has
separate functions (SCROLL-Down, SCROLL-Up, MODE
and Change-Level). The MODE and Change-Level push-
buttons, when pressed together, provide a SAVE function.
1. SCROLL Down-Up pushbuttons (↕), see Fig. 20.
The SCROLL Down-Up pushbuttons (↕) are used to
scroll through the selectable messages. The double-headed
arrow (↕), which is located in the lower left position of the
second line of the display, represents the SCROLL Down-
Up pushbuttons. The SCROLL Down-Up pushbuttons (↕)
can be pressed to display selectable messages one at a time or
held down to scroll through the selectable messages at a rate
of two per second. When the last item of the selectable
message is viewed, the display wraps around and displays
the first selectable message again.
Fig. 20—(↕) SCROLL pushbutton function.
Additioanl sequence status information when an Expanded Annunciator is connected to the relay module. Also see
CB780/CB784 Operating and Maintenance Manual, Manual Number 750-166.
To Next Page
Loading...