CB780/CB784 RELAY MODULES
32-00207—01 4
Table 2. Flame Detection Systems (Fig. 3, 4, 5).
a
Circuitry tests the flame signal amplifier 12 times a minute during burner operation and shuts down the burner if the
amplifier fails.
b
The 817-1743 Flame Detector should be used only on burners that cycle on-off at least once every twenty-four hours.
Appliances with burners that remain on for twenty-four hours continuously or longer should use the 817-1121 Flame
Detector with the 833-2741 Amplifier as the ultraviolet flame detection system.
c
Circuitry tests all electronic components in the flame detection system (amplifier and detector) 12 times a minute
during burner operation and shuts down the burner if the detection system fails. Series 4 amplifiers check 60 to 120
times per minute.
Table 3. Sequence Timing For Normal Operation.
a
*STANDBY and RUN can be an infinite time period.
**PURGE will be determined by which purge card is selected.
a
The operating sequence of the CB780 and CB784 Relay Modules are identical. The only difference between the Relay
Modules is that the Keyboard Display Module is standard with the CB780 and optional with the CB784.
b
The MFEP will be determined by which terminal is used, see Fig. 7 and 18.
SIL 3 Capable:
SIL 3 Capable in a properly designed Safety Instrumented
System. See form number 65-0312 for Certificate Agree-
ment.
Approvals:
Underwriters Laboratories Inc. listed, File No. MP268,
Guide No. MCCZ.
Factory Mutual approved, Report No. 1V9A0. AF.
IRI acceptable.
Federal Communications Commission, Part 15,
Class B—Emissions.
Mounting:
833-2725 for panel mount.
Required Components:
CB780: 120 Vac, 50/60 Hz, 833-2718.
CB784: 120 Vac, 50/60 Hz, 833-2720.
Plug-in Flame Signal Amplifier, see Table 2.
Plug-in Purge Timer Cards: selectable:
833-2730—30 sec.
833-2731—60 sec.
833-2732—90 sec.
833-2733—-2-1/2 min.
NOTE: The CB780 and CB784 are identical except for
the Keyboard Display Module which is standard
with the CB780 and optional with the CB784.
Accessories:
Optional:
DATA CONTROLBUS MODULE™—part no. 833-2729.
Provides communication and remote reset capabili-
ties on CB784; remote display capabilities on CB780
and CB784.
CB783 Expanded Annunciator—part no. 833-2726.
Keyboard Display Module—part no. 833-2727. (Stan-
dard on CB780; optional on CB784.)
Remote Mounting Kit for the Keyboard Display, NEMA
4—part no. 833-2740.
Tester—part no. 626-5050.
Plug-In Flame Amplifiers Applicable Flame Detectors
Type Color Self-Checking Part Number
Flame
Failure
Response
Time Fuel Type Part Number
Infrared Red No 833-2722 3 sec. Gas, oil, coal Infrared
(Lead Sulfide)
817-1742
Dynamic
AMPLI-CHECK™
833-2723
a
Red/Whi
te
No 833-3495 Infrared 817-4133
Dynamic
AMPLI-CHECK™
833-3496
a
Ultraviolet Purple No 833-2724 Gas, oil Ultraviolet
817-1743
b
Ultraviolet
Self-Check
Green Dynamic
Self-Check
833-2741
c
Gas, oil, coal Ultraviolet
(Purple Peeper®)
817-1121
Device Initiate Standby Purge
Flame
Establishing
Period
Run
Post
Purge
Timing
Interlock
Circuits
Firing
Rate
Circuit
Energy
Saving
Prepurge
Approval
Code BodiesPilot Main
CB780/
CB784
10 sec. * ** 4 or 10
sec.
10 or
15
sec.
b
* 15 sec. Preignition
, Lockout,
High and
Low Fire
4-wire
modulatin
g
No FM/IRI
Modulating
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