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PUMP GROUP, MIXED DN 25 WITH WEATHER-COMPENSATED ACTUATOR
2.4.1 CHECK VALVE
2.4.2 PUMP [SPECIALIST]
The pump can be completely isolated. It can be replaced and maintained without draining
the heating circuit.
Isolation of the pump:
1. Close the ball valves in the flow and return (A-1, F-1).
2. Disconnect the expansion tank from the installation and depressurise the installation.
3. Remove the actuator from the mixing valve.
4. Turn the bypass screw of the mixing valve such that the slot is in the same line as the
markings (see figure on the left).
5. Turn the nose of the valve cock into position "VL zu" (flow closed) to close the mixing valve.
The mixing valve is now closed and drop tight.
#
The pump group is equipped with a check valve (can be opened, D-1) in the return pipe
and with a non-return valve (can be opened, C-3) in the mixing valve.
Operation
During operation, the marking must be directed to "Z".
The check valve is closed.
Flow only in the direction of the arrow.
Filling, draining, venting
For filling, draining and venting the installation, the marking must be directed to "A".
The check valve is open.
Flow in both directions.
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