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6.3
INTERLOCK SENSORS
ALARM
Liquid Leak
Element Over-
Temperature
Liquid Over-Temperature
Liquid Level
MODEL IDH OPERATION / MAINTENANCE MANUAL
CAUSES
Liquid leak detected inside
heater housing
Sensor/wiring shorted or
improperly wired to
interlock
No liquid or insufficient
flow through the heater
Insufficient control settings
or scheme
Sensor/wiring shorted or
improperly wired to
interlock
Insufficient flow through
the heater
Insufficient control
algorithm
Sensor/wiring shorted or
improperly wired to
interlock
Insufficient liquid present in
heater
Liquid boiling
Sensor/wiring shorted or
improperly wired to
interlock
SOLUTIONS
If liquid is present in the
housing, decommission
and replace heater per
Section 5.3
Inspect/test sensor wiring
Increase flow rate
Modify control settings or
scheme to limit the
element to ≤250°C
Inspect/test sensor wiring
Increase flow rate
Check for blockage
Relocate outlet
temperature sensor
closer to heater outlet
Adjust control settings or
scheme
Inspect/test sensor wiring
Increase flow rate
Review liquid properties
vs. conditions
Adjust sensor
Inspect/test sensor wiring
PAGE 15
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