Honeywell 7800 Series Manual page 20

RM7885A
OPERATION
Fig. 18—Sequence status LEDs.
Burner Sequence
INITIATE
STANDBY
STANDBY HOLD: F/G
(Flame Detected)
SAFE-START CHECK
PILOT IGNITION
RUN
RESET/ALARM TEST
See Table 6 for further details of Hold conditions.
STATIC CHECKOUT
!
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 installing or
removing a jumper on the subbase.
3. Before continuing to the next test, be sure to
remove the test jumper(s) used in the previous
tests.
4. Replace all limits and interlocks not operating
properly. Do not bypass limits and interlocks.
5. Close all manual fuel shutoff valve(s) before
starting these tests.
After checking all wiring, perform this checkout before
installing the RM7885A on the subbase. These tests verify
that the Q7800 Wiring Subbase is wired correctly, and that
the external controllers, limits, interlocks, actuators, valves,
transformers, motors and other devices are operating prop-
erly.
NOTE: Do not perform a dielectric test with the RM7885A
installed. Internal surge protectors will break down and
conduct a current. This could cause the RM7885A to fail
SEQUENCE
STATUS
LEDs
RESET
PUSHBUTTON
FLAME
SIMULATOR INPUT
TABLE 3—LED SEQUENCE STATUS DISPLAY INFORMATION.
LEDs Energized
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
POWER, PILOT, FLAME, MAIN and ALARM
CAPTIVE
MOUNTING
SCREW
DUST
COVER
RELAY
MODULE
FLAME
AMPLIFIER
FLAME CURRENT
TEST JACKS
M8995
the dielectric test or possibly destroy the internal lightning
and high current transient protection components.
EQUIPMENT REQUIRED
1. Voltmeter (20 kohm/volt minimum sensitivity) set on
the 0-300 Vac scale.
2. Two jumper wires, no. 14 wire, insulated, 12 inches
(304.8 mm) long, with insulated alligator clips at both ends.
GENERAL INSTRUCTIONS
1. Perform all applicable tests listed in Static Checkout,
Table 4, in the order listed.
2. MAKE SURE THAT ALL MANUAL FUEL
SHUTOFF VALVE(S) ARE CLOSED.
3. For each test, open the master switch, remove the
jumper from the previous test and and install the jumper
wire(s) between the subbase wiring terminals listed in the
Test Jumpers column of Table 4.
4. Close the master switch before observing operation.
5. Read the voltage between the subbase wiring terminals
listed in the Voltmeter column of Table 4.
6. If there is no voltage or the operation is abnormal,
check the circuits and external devices as described in the last
column.
7. Check all wiring for correct connections, tight terminal
screws, correct wire, and proper wiring techniques. Replace
all damaged or incorrectly sized wires.
8. Replace faulty controllers, limits, interlocks, actua-
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