CR7890B 7800 SERIES INTEGRATED BURNER CONTROL
Final Wiring Check
1. Check the power supply circuit. The voltage and
frequency tolerance must match those of the CR7890.
A separate power supply circuit can be required for the
CR7890. Add the required disconnect means and
2. Check all wiring circuits and complete the Static
Checkout in Table 6 before installing the CR7890.
3. Restore the panel power.
After checking all wiring, perform this checkout before
applying power to the CR7890. These tests verify that the
wiring is correct, and that the external controllers, limits,
interlocks, actuators, valves, transformers, motors and other
devices are operating properly.
Can cause serious injury, death or equipment
1. Close all manual fuel shutoff valve(s) before starting
2. Use extreme care while testing the system. Line
voltage is present on most terminal connections
when power is on.
3. Open the master switch before installing or
removing a jumper on the subbase.
4. Before continuing to the next test, be sure to
remove test jumper(s) used in the previous test.
5. Replace all limits and interlocks that are not
operating properly. Do not bypass limits and
Equipment Damage Hazard.
Can cause equipment damage or equipment
Do not perform a dielectric test with the CR7890
installed. Internal surge protectors break down and
conduct a current, causing the CR7890 to fail the
dielectric test or possibly destroy the internal lightning
and high current protection.
Table 5. Composition of Each Combination.
50 VA Pilot Duty plus
180 VA ignition plus
motor valves with:
660 VA inrush,
360 VA open,
250 VA hold.
2A Pilot Duty
1. Voltmeter (1M ohm/volt minimum sensitivity) set on the
0 to 300 Vac scale.
2. Two jumper wires, No. 14 wire, insulated, 12 in. (305
mm) long with insulated alligator clips at both ends.
1. Perform all applicable tests listed in the Static Checkout,
Table 6, in the order listed.
2. Make sure all manual fuel shutoff valves are closed.
3. For each test, open the master switch and install the
jumper wires between the subbase wiring terminals
listed in the Test Jumpers column.
4. Close the master switch before observing the operation.
5. Read the voltage between the subbase wiring terminals
listed in the Voltmeter column.
6. If there is no voltage or the operation is abnormal, check
the circuits and external devices as described in the last
7. Check all wiring for proper connections, tight terminal
screws, and appropriate wire and wiring techniques.
8. Replace all damaged or incorrectly sized wires.
9. Replace faulty controllers, limits, interlocks, actuators,
valves, transformers, motors and other devices, as
10. Make sure normal operation is obtained for each
required test before continuing the checkout.
11. After completing each test, be sure to remove the test
12. Verify that the CR7890 does not respond to radiation
sources (other than flame, see list).
Can cause serious injury or death.
Be sure all manual fuel shutoff valves are closed.
Low fuel pressure limits, if used, could be open.
Bypass them with jumpers for the remaining static
tests (if required).
65 VA Pilot Duty plus
motor valves with:
3850 VA inrush,
700 VA open,
250 VA hold.