1-24 750-166
CB780/CB784
OPERATION
EXPANDED ANNUNCIATOR MESSAGES,
SEE TABLE 6
The Expanded Annunciator (EA) may or may not be
connected because it is an optional device. If the EA is not
connected, a display message of “(EA not connected)” will
be shown. If the EA is connected, display messages will be
shown, see Table 6 and the Diagnostic and Troubleshooting
section of the CB780/CB784 Operation and Maintenance
Manual, Manual No. 750-166, Tables 6 and 7 for fault codes.
When accessing Expanded Annunciator Messages, follow
the same operations as used with the Selectable Messages.
TABLE 6—EXPANDED ANNUNCIATOR MESSAGES.
Selectable Message Display Value First Line
(Second Line) (Second Line) Message
↕Expanded Annun.↔
↕Expanded Annunciator (EA not connected)<
↕Current Status (CS:)
a
EA Message< ↓EA
↕Valve Closure (Valve Close) T4 ON or OFF< ↓EA
↕Burner Switch (Burner Sw.) T5 ON or OFF< ↓EA
↕Operating Control (OperControl) T6 ON or OFF< ↓EA
↕Auxiliary Limit (Aux Limit 1) T7 ON or OFF< ↓EA
↕Auxiliary Limit (Aux Limit 2) T8 ON or OFF< ↓EA
↕Low Water Cutoff (LWCO) T9 ON or OFF< ↓EA
↕High Limit (High Limit) T10 ON or OFF< ↓EA
↕Auxiliary Limit (AuxLimit 3) T11 ON or OFF< ↓EA
↕Oil Selection Switch (Oil Select) T12 ON or OFF< ↓EA
↕High Oil Pressure Switch (Hi OilPres) T13 ON or OFF< ↓EA
↕Low Oil Pressure Switch (LowOilPres) T14 ON or OFF< ↓EA
↕High Oil Temperature Switch (Hi OilTemp) T15 ON or OFF< ↓EA
↕Low Oil Temperature Switch (LowOilTemp) T16 ON or OFF< ↓EA
↕Atomizing Switch (Atomize Sw) T19 ON or OFF< ↓EA
↕Gas Selection Switch (Gas Select) T17 ON or OFF< ↓EA
↕High Gas Pressure Switch (Hi GasPres) T18 ON or OFF< ↓EA
↕Low Gas Pressure Switch (LowGasPres) T19 ON or OFF< ↓EA
↕Airflow Switch (Airflow Sw) T20 ON or OFF< ↓EA
↕Auxiliary Interlock (Aux ILK 4) T21 ON or OFF< ↓EA
↕Auxiliary Interlock (Aux ILK 5) T22 ON or OFF< ↓EA
↕EA Fault Code nnn< ↓EA
↕Software Revision (SW Rev.) nnnn< ↓EA
a
Expanded Annunciator Diagnostic Current Status Messages can be reviewed in CB780/CB784 Operating and Maintenance
Manual, Manual Number 750-166.
RUN/TEST SWITCH FUNCTIONS
The Run/Test Switch is located on the top side of the
CB780/CB784; see Fig. 19. The Run/Test Switch allows the
burner sequence to be altered as follows:
1. In Prepurge Drive To High Fire Position, the Run/Test
Switch, when placed in the TEST position, will hold in
PREPURGE with the firing rate motor in the High Fire
position.
2. In the measured PREPURGE sequence, the Run/Test
Switch, when placed in the TEST position, will cause the
PREPURGE timing to stop. The firing rate motor will be in
the High Fire position.
3. In Prepurge Drive to Low Fire position, the Run/Test
Switch, when placed in the TEST position, will hold the
burner sequence in PREPURGE with the firing rate motor in
the Low Fire position.
4. In PFEP, the Run/Test Switch, when placed in the
TEST position, will stop the timer during the first eight
seconds when a ten second PFEP is selected or during the
first three seconds when a four second PFEP is selected,
allowing pilot-turn-down test and other burner adjustments
to be made. This activates a fifteen second flameout timer
that permits pilot flame adjustment without nuisance safety
shutdowns. The Run/Test Switch will be ignored during
PFEP for the CB780/CB784 if terminals 8 and 9 or 9 and 21
are jumpered.
5. During RUN, the Run/Test Switch, when placed in the
TEST position, will drive the firing rate motor to the Low
Fire position.
NOTE: When CB780/CB784 is switched to the TEST mode,
it will stop and hold at the next Run/Test Switch point in
the operating sequence. Make sure that the Run/Test
Switch is in the RUN position before leaving the installa-
tion.
SELECTABLE SITE-CONFIGURABLE JUMPERS
The CB780/CB784 has two site-configurable jumper
options; see Fig. 24 and Table 7. The site-configurable
jumpers should be clipped with side cutters and the resistors
removed from the Relay Module.
To Next Page
Loading...