CB780/CB784 RELAY MODULES
25 32-00207—01
a
Expanded Annunciator Diagnostic Current Status Messages can be reviewed in CB780/CB784 System Annunciation
Diagnostics and Troubleshooting, Bulletin Number CB-7803.
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 shut-
downs. 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 installation.
Table 6. Expanded Annunciator Messages.
Selectable Message
(Second Line)
Display Value
(Second Line)
First Line
Message
Expanded Annun.
Expanded Annunciator (EA not connected)<
Current status (CS:)
a
EA Message<
Valve Closure (Valve Close)
T4 1 or 0< EA
Burner Switch (Burner Sw.)
T5 1 or 0< EA
Operating Control (OperControl)
T6 1 or 0< EA
Auxiliary Limit (Aux Limit 1)
T7 1 or 0< EA
Auxiliary Limit (Aux Limit 2)
T8 1 or 0< EA
Low Water Cutoff (LWCO)
T9 1 or 0< EA
High Limit (High Limit)
T10 1 or 0< EA
Auxiliary Limit (Aux Limit 3)
T11 1 or 0< EA
Oil Selection Switch (Oil Select)
T12 1 or 0< EA
High Oil Pressure Switch (HiOilPres)
T13 1 or 0< EA
Low Oil Pressure Switch (LowOilPres)
T14 1 or 0< EA
High Oil Temperature Switch (HiOilTemp)
T15 1 or 0< EA
Low Oil Temperature Switch (LowOilTemp)
T16 1 or 0< EA
Atomizing Switch (Atomize Sw)
T19 1 or 0< EA
Gas Selection Switch (Gas Select)
T17 1 or 0< EA
High Gas Pressure Switch (Hi GasPres)
T18 1 or 0< EA
Low Gas Pressure Switch (LowGasPres)
T19 1 or 0< EA
Airflow Switch (Airflow Sw)
T20 1 or 0< EA
Auxiliary Interlock (Aux ILK 4)
T21 1 or 0< EA
Auxiliary Interlock (Aux ILK 5)
T22 1 or 0< EA
EA Fault Code
nnn< EA
Software Revision (SW Rev.)
nnnn< EA
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