Troubleshooting; Maintenance - Honeywell 800 Series Manual

HONEYWELL MODEL 700/800 SIGNAL PROCESSOR AND VIEWING HEAD

TROUBLESHOOTING

Lockout or Faulty VH Indication
If the viewing head produces any pulses during the last
one third of the self-check time, the relay will immediately
de-energize, the display will show "LO" (lockout), and the
FAULT LED will flash on and off rapidly. Exit lockout by
pressing RESET.
If a pulse or pulses come in during the last one third of the
self-check time while the automatic data sampling is
taking place, the automatic process will be aborted, the
relay will be de-energized if it was energized, the display
will show "LO" (lockout), and the FAULT LED will flash on
and off rapidly. Press RESET to exit this.
If a viewing head is disconnected, the display will show
"L1." Reconnect the viewing head and press RESET.
If the signal processor displays "EE" upon power up, it is
an indication that the EEPROM stored data for the viewing
head does not match for the currently connected viewing
head. For further information on this condition, refer to
the Parameter Match Error Section below.
Parameter Match Error
If the signal processor displays "EE" upon power up, it is
an indication that the EEPROM stored data for the viewing
head does not match for the currently connected viewing
head. This error can occur when a different model viewing
head is connected to the signal processor than was
previously connected. As a result, the signal processor
discards the previous stored parameters and loads factory
defaults, except the RELAY ON SETPOINT is set to 31.
Setpoint values and other parameters plus error-checking
codes are stored in EEPROM (Electrically Erasable
Programmable Read Only Memory) in the signal
processors. This data is then error-checked when it is read
at power up. If the data does not match exactly what was
previously stored, the signal processor discards all data,
displays "EE", and loads factory defaults. The RELAY ON
SETPOINT is set to 31. Since the flame count cannot go
66-2069EP—08
this high, the flame relay cannot be energized. The signal
processor can be reset by changing the RELAY ON
SETPOINT to a reasonable value or by pressing LOAD
FACTORY DEFAULTS.
Panel Lock with No VH Connected
The signal processor requires continuous communication
with the connected viewing head. If the viewing head is
disconnected, communication will be lost and the display
is made inoperative where no settings can be examined or
changed. To correct this condition, reconnect the viewing
head to the signal processor and cycle power.
Grounding and Shielding
See "Grounding and Shielding" on page 3. for further
troubleshooting help in regards to proper grounding and
shielding techniques.

MAINTENANCE

(UV tube models Only)
The UV sensor has a limited lifespan. Under extreme
conditions, the lifespan can be as low as 10,000 hours.
However in the most favorable conditions, the lifespan is
50,000 hours or more. The service life of the UV sensor is
considered terminated when the sensitivity becomes
lower than 50% of the initial value.
A monthly sensitivity check is suggested to determine if
the UV sensor's life is terminated. The reading of the
signal processor digital display should be compared to the
initial reading of the unit when it was installed. Ensure
similar burner fire conditions of the application, and that
the same gain settings of the viewing head, are used
during each sensitivity check. If it is determined that the
sensitivity is below 50% of the initial value (terminated life
of the sensor), the sensor should be replaced.
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