750-166 1-27
TABLE 8—STATIC CHECKOUT (Continued).
CB780/CB784
STATIC CHECKOUT • CHECKOUT
Test
No.
Test
Jumpers
Volt-
meter Normal Operation
If Operation is Abnormal, Check the
Items Listed Below
WARNING
Make sure all manual fuel shutoff valves are closed.
IMPORTANT: Low fuel pressure limits, if used, could be open. Bypass them with jumpers for the remaining Static
Tests (if required).
14 15-13 — 1. Raise set point of Series 90 controller—
firing rate motor should drive toward open.
2. Lower setpoint of Series 90 controller—
firing rate motor should drive toward
closed.
1. Series 90 Controller.
2. Firing rate motor and transformer.
Final
CAUTION
On completing these tests, open the master switch and remove all test jumpers from the subbase
terminals. Also remove bypass jumpers from the low fuel pressure limits (if used).
Checkout
IMPORTANT:
1. If the system fails to perform properly, note the fault
code, fault message, equipment status, and sequence
time on the display. Refer to the Troubleshooting sec-
tion of the CB780/CB784 Operation and Maintenance
Manual, Manual Number 750-166.
2. Repeat ALL required Checkout tests after all adjust-
ments are made. ALL tests must be satisfied with the
flame detector(s) in its FINAL position.
EQUIPMENT RECOMMENDED
Volt-ohmmeter (20 kohm/volt minimum sensitivity) with:
• 0-300 Vac capability.
• 0-6000 ohm capability.
• 0-10 Vdc capability.
CHECKOUT SUMMARY
• Preliminary inspection—all installations.
• Flame signal measurement—all installations.
• Initial lightoff check for proved pilot—all installations
using a pilot.
• Initial lightoff check for direct spark ignition of oil—
all burners using DSI.
• Pilot turndown test—all installations using a pilot.
• Hot refractory saturation test—all installations using
Infrared (lead sulfide) Flame Detectors.
• Hot refractory hold-in test—all installations.
• Ignition interference test—all installations using flame
rods.
• Ignition spark pickup—all installations using Ultra-
violet Flame Detectors.
• Response to other ultraviolet sources—all installa-
tions using Ultraviolet Flame Detectors.
WARNING
Do not allow fuel to accumulate in the combus-
tion chamber. If fuel is allowed to enter the
chamber for longer than a few seconds without
igniting, an explosive mixture could result. It is
recommended that you limit the trial for pilot to
ten seconds, and limit the attempt to light the main
burner to two seconds from the time the fuel has
reached the burner nozzle. In any case, do not
exceed the nominal lightoff time specified by the
equipment manufacturer; close the manual fuel
shutoff valve(s) if the flame is not burning at the
end of the specified time.
CAUTION
1. Use extreme care while testing the system. Line
voltage is present on most terminal connections
when power is on.
2. Open the master switch before removing or in-
stalling the CB780/CB784 or Keyboard Dis-
play Module connector.
3. Make sure all manual fuel shutoff valve(s) are
closed before starting the initial lightoff check
and the Pilot Turndown tests.
4. Do not put the system in service until you have
satisfactorily completed all applicable tests in
this section and any others required by the
equipment manufacturer.
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