CB780E/CB784E RELAY MODULES WITH VALVE PROVING
750-234 9 32-00150—03
whenever control terminal 6 is energized, and the Lockout
Interlock string (including airflow switch) is closed during
STANDBY.
Preignition Interlock
The Preignition Interlock input is typically connected to
proof-of-closure switches for fuel valve(s). The Preignition
Interlock must be energized throughout PREPURGE. If the
Preignition Interlock opens during STANDBY, it causes a
hold (30 seconds). The CB780E/CB784E will lockout if the
interlock does not close within 30 seconds during
STANDBY. If the Preignition Interlock opens during
PREPURGE, it will lockout. If the Preignition Interlock is
open after five seconds into POSTPURGE, the
CB780E/CB784E will lockout. The Preignition Interlock is
ignored during the ignition trials state and during RUN.
INSTALLATION
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
To prevent possible hazardous burner operation,
verification of safety requirements must be
performed each time a control is installed on a
burner.
When Installing This Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and
marked on the product to make sure the product is
suitable for the application.
3. Installer must be a trained, experienced, flame safe-
guard technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect the power supply before beginning
installation to prevent electrical shock, equipment
and control damage. More than one power supply
disconnect may be involved.
Wiring Information
1. Wiring connections for the CB780E/CB784E are
unique; therefore, refer to Fig. 7–12 or the correct
Specifications for proper subbase wiring.
2. Wiring must comply with all applicable codes, ordi-
nances and regulations.
3. Wiring, where required, must comply with NEC Class
1 (Line Voltage) wiring.
4. Loads connected to the CB780E/CB784E must not
exceed those listed on the CB780E/CB784E label or
the Specifications, see Table 1.
5. Limits and interlocks must be rated to simultane-
ously carry and break current to the ignition trans-
former, pilot valve, and main fuel valve(s).
6. All external timers must be listed or component rec-
ognized by authorities who have jurisdiction for the
specific purpose for which they are used.
IMPORTANT:
1. For on-off gas-fired systems, some authorities
who have jurisdiction prohibit the wiring of any
limit or operating contacts in series between the
flame
safeguard control and the main fuel valve(s).
2. Two Flame Detectors can be connected in parallel
with the exception of Infrared Flame Detector
(817-1742).
3. This equipment generates, uses and can radiate
radio frequency energy and, if not installed and
used in accordance with the instructions, may
cause interference to radio communications. It
has been tested and found to comply with the lim-
its for a Class B computing device of Part 15 of
FCC rules which are designed to provide reason-
able protection against such interference when
operated in a commercial environment. Operation
of this equipment in a residential area may cause
interference; in which case, the users at their own
expense may be required to take whatever mea-
sures are required to correct this interference.
4. This digital apparatus does not exceed the Class B
limits for radio noise for digital apparatus set out
in the Radio Interference Regulations of the Cana-
dian Department of Communications.
Humidity
Install the CB780E/CB784E where the relative humidity
never reaches the saturation point. The CB780E/CB784E
is designed to operate in a maximum 85% RH continuous,
noncondensing, moisture environment. Condensing
moisture may cause a safety shutdown.
Vibration
Do not install the CB780E/CB784E where it could be
subjected to vibration in excess of 0.5G continuous
maximum vibration.
Weather
The CB780E/CB784E is not designed to be weather tight.
If installed outdoors, the CB780E/CB784E must be
protected by an approved weather-tight enclosure.
Mounting Wiring Subbase
NOTE: For installation dimensions, see Fig. 2.
1. Mount the subbase in any position except horizon-
tally with the bifurcated contacts pointing down. The
standard vertical position is recommended. Any
other position decreases the maximum ambient
temperature rating.
2. The 833-2725 Wiring Subbase can be mounted
directly in the control cabinet. Be sure to allow ade-
quate clearance for servicing, installation, access or
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