SAMUEL JACKSON HO-4-1234, Руководство по обслуживанию

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PAGE 16 of 61 HO-7-1237 & HO-4-1234 OIL-FIRED HEATERS
© SAMUEL JACKSON, INCORPORATED 2003 ALL RIGHTS RESERVED
The external electrical connection diagram shows the fan interlock between terminals 50
and 10 on the 20000 remote temperature control. Sometimes the installing electrician
substitutes an electrical interlock on the motor starter or a relay contact output from a
central PLC control system to accomplish the same task. Any of these methods of fan
interlocking is acceptable. A fan interlock of some sort must be present to avoid this
error.
ERROR 442
AIR FLOW SWITCH HAS BEEN BYPASSED: This error indicates that an electrical
signal is being received from the air flow switch with no fan interlock signal present 2
minutes after turning the Heater off, effectively bypassing this important safety feature.
Check the adjustment of the air flow switch (AFS) and verify its operation.
ERROR 443
*
NO FAN INTERLOCK. IS FAN ON?: This ERROR is caused when an attempt is made to
start the heater when no fan interlock signal is present. A fan interlock relay is supplied
with the 20000 remote control to provide instant shutdown of the burner when the fan is
stopped. The installing electrician is responsible for wiring the coil of this relay to the
fan circuit. Sometimes the installing electrician substitutes an electrical interlock on the
motor starter or a relay contact output from a central PLC control system to accomplish
the same purpose. Any of these methods of fan interlocking is acceptable.
ERROR 444
EXCESSIVE FLAME FAILURES: During ignition and operation, flame failures are
counted. When the total comes to 3, the PLC shuts the Heater down on ERROR 444.
Use the error log to determine which alarms the flame failure triggered. Knowing which
three alarms caused the error will help determine the problem.
ALARM 446
FLAME NOT ESTABLISHED: This ERROR means that the burner failed to light during
its ignition sequence. See the maintenance tips later in this section. The Heater will not
attempt to restart if ERROR 456
NO SAFETY SWITCH TEST PERFORMED LAST SIX
SHUTDOWNS occurs and is reset without allowing time for test.
ALARM 451
FLAME FAILED IN OPERATION: This ALARM means that the burner failed after the
flame had been established. See maintenance tips below. The Heater will not attempt to
restart if ERROR 456
NO SAFETY SWITCH TEST PERFORMED LAST SIX
SHUTDOWNS occurs and is reset without allowing time for test.