Manual of instructions TT-188 28/37
7.6. Acoustic indication of faults (horn)
In order to perceive faults immediately serves a horn.
If the level in the tank drops, the horn rings with a continuous sound (pre-warning). The temperature
control unit still operate. The tank volume has to be corrected.
If the level falls below the minimum level in the system, the thermal relay of the motor or the
mechanical safety thermostat shuts off, the unit stops and the horn rings with an intermittent sound.
Flow control or temperature deviation control let the horn rings with intermittent sound. The
temperature control unit still operate. The alarm can be switched off by pressing the flow control button
on the controller or the temperature specification.
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