Manual of instructions TT-390 26/35
7.6. Acoustic indication of faults (horn)
In order to perceive faults immediately serves a horn.
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 sounds.
Flow control or temperature deviation control let the horn 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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