n If the external application is in a higher position, the application may run
empty if the pump is switched o and air enters the thermostatic circuit
(e.g. due to an incompletely closed or defective vent valve). This can
cause the heat transfer liquid in the process thermostat to overflow.
n Install a dirt trap if the circuit in the application is not free of dirt.
Fig. 19: Connection diagram with vent valve
The external application must be connected according to the sketch (Fig. 19)
so that gas/vapor bubbles can be removed from the system and undisturbed
operation is possible. The outflow of the pump must be connected to the
lower connection of the application. The return line to the pump connector
must be connected to the top connection of the application. The application
is thus flowed through from bottom to top.
Hose nozzle:
n Push the hose onto the hose nozzle. Secure the hoses against slipping
using hose clips or similar.
Ball bush and hose nozzle:
n The sealing surfaces of the cone and ball bush/hose nozzle may not be
damaged (falling onto hard ground or similar).
n Carefully remove dirt from the sealing surfaces (cone and ball bush /
hose nozzle) before assembly.
n Place the ball bush/hose nozzle vertically on the cone (support the hose
when tightening).
n The ball bush / hose nozzle may not rotate when tightening the union
nut (if necessary apply some grease or oil between the ball bush / hose
nozzle and union nut).
n Tighten the union nut only moderately with the open-end wrench and
hold it against the connecting sleeve with a second open-end wrench.
Mounting instructions for connecting an
application
V6 Integral Process Thermostats and High-Temperature Thermostats 39 / 198
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