09/2021 ECO Gold 29 / 134
Switch the button for the distribution of the pump flow to “EXT”.
The position EXT gives the greatest flow in the external circuit (cylindrical
chamber).
Maintenance of the calibration thermostat
For cleaning purposes and check-up of the bath liquid, we recommend lifting
the front cover with the chamber as follows: Remove the connecting flange and
release the screws M4. This structural component can now be taken out.
Connection of the cooling water
Note that the following conditions apply for the connection of the cooling water supply:
Cooling water pressure (feed - outlet)
Differential pressure (feed - outlet)
Cooling water temperature
10 to 15 °C recommended,
10 to 30 °C admissible with power restrictions)
Cooling water hose for connection to the device
Ways of adjusting the pump flow
The circulation of the heat transfer liquid by the pump can be divided between internal (INT) and external (EXT) with the aid of
the selector switch at the front on the control head (flow distribution). This adjustment is continuously variable and is also pos-
sible at any time during operation.
The adjustment between internal and external circulation is only practicable when an external consumer is connected. You need
a pump connection set for this. This set is included as standard with cooling devices and with the heating devices E 4 G and
ET 15 G. With immersion thermostats and the other heating thermostats the pump connection set is available as an accessory
( 9).
With a pure bath application the selector switch has to be set
to INT.
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