Grundfos MQ 3-45 - Technical Specifications and Accessories; Dimensions, Electrical Data, and Approvals

28.04.2003
GB
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4.10.1 Observation A
A1
TM02 2369 4201
Turn off the tap.
A2
TM02 2370 4201
The system is closed; the pressure must be minimum
2.5 bar.
If 2.5 bar is not reached, check the hydraulics.
If the pressure is above 2.5 bar, continue the fault finding
procedure.
A3
TM02 2371 4201
Wait approx. 15 seconds to see what happens when the
pump stops.
If the pump does not stop, even when the start/stop but-
ton is on, replace the controller.
If the pressure falls below 2.5 bar, check the non-return
valve in the suction line.
If the pressure does not fall, continue the fault finding
procedure.
A4
TM02 2372 4201
Disconnect the electricity supply by pulling out the plug.
A5
TM02 2373 4201
Remove the pressure switch plug from the controller.
Approx. 15 sec.
Non-return
valve