PAGE 17 of 61 HO-7-1237 & HO-4-1234 OIL-FIRED HEATERS
© SAMUEL JACKSON, INCORPORATED 2003 ALL RIGHTS RESERVED
TIPS
THE FOLLOWING MAINTENANCE TIPS WILL HELP TO MINIMIZE FLAME
FAILURE ALARMS:
•
Clean the spark ignitor if it appears dirty. Look for oil on the spark ignitor. See
drawing in Service Manual entitled
ADJUSTMENT OF 12796 AND 14200 SPARK
IGNITORS
for correct adjustment.
•
Check for proper clamping position of the spark ignitor. See drawing referenced
above for this adjustment.
•
Make sure that the oil purge in the test program was complete and that you see fuel
rising in the flowmeter without air bubbles when ignition is attempted. Verify that the
small purge cock at the burner head is closed.
•
If you see a flame in the viewing window of the burner, but the flame light does not
come on, suspect a defective Flame Scanner (FS) or a defective Flame Relay (FLR).
Unscrew FS and test it with a lighted match while watching Input # 14 on the PLC or
the light on the Flame Relay.
ERROR 453
FLAME SIGNAL BEFORE SPARK BEFORE FUEL:
This ERROR is normally caused
by a malfunction or tampering with the flame relay (FLR).
ERROR 455
FLAME SIGNAL DURING SPARK BEFORE FUEL:
This ERROR is caused by the
Flame Scanner (FS) seeing the spark as a flame. Remove the scanner and verify that the
small orifice disk is in front of the lens. If the disk is there, the 3mm hole may need to be
smaller.
ERROR 456
NO SAFETY SWITCH TEST PERFORMED LAST SIX SHUTDOWNS:
Automatic tests
for gas valve leaks (Dual-Fuel only) and bypassed air flow switch (AFS) or fan interlock
relay have been interrupted for the past 6 shutdowns. Each time the heater is turned off,
the PLC attempts to spend about 2 minutes (10 minutes for dual- fuel) performing these
tests. These tests can be interrupted by simply turning off the power or restarting the
heater before the 2 minutes (10 minutes for dual- fuel) has ended. The PLC demands
however, that these tests be performed at least once every 7 shutdowns. If each of the past
6 shutdowns have had the tests interrupted, the PLC will not start until the RESET button
is pressed (ERROR 456 will be displayed).
