Manual of instructions TT-390 25/35
7. Safety and monitoring devices
7.1. Pump
The pump motor is fitted with an overload relay and pre-switch automatic cut-outs.
7.2. Heating – Temperature monitoring
In the temperature controller the maximum temperature (365°C) is limited. Exceeding this temperature
the heaters switch off.
A safety thermostat (365°C) with automatic reset protects the switching of the heating and a safety
thermostat (370°C) with automatic reset stops the unit. When the temperature is exceeded the
indication lamp lights. As soon as the temperature falls below the set temperature the unit and heating
switches on.
Do not put the maximum temperature in the controller higher, deeper values
are allowed!
The temperature control unit can excess overpressure – risk of injury from
escaping steam!
7.3. Level control
The unit is mounted with a level switch. If the system loses oil, the left yellow indication lamp lights and
the unit will switch off. The unit has to refill manually.
If there is too much oil, the right yellow indication lamp lights and the unit will switch off. The oil level
should be reduced by the drain. As soon as the level is sufficient or permitted again, the yellow
indication lamp lights out and the unit switches the pump on.
Too much heat transfer oil reduces the expansion volume! The heat transfer
oil expands during the heating and could be overflow.
7.4. Flow control
The electronic flow control measures the actual flow in the heat transfer circuit and displays it digitally
on the controller. For controlling the minimal flow you can choose between automatic and manual
mode.
7.5. Temperature deviation control
As soon as the difference between pre-set desired value and the actual value exceeds +/- 5°C, the
LED indication lamp lights and the horn sounds, the unit still operates.
This alarm is only activated when the set temperature has been reached the first time. The value of
the temperature of the deviation control (factory preset +/- 5°C) and the starting interlock for
temperature deviation control (factory preset on) can be adjusted on the controller.
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