VDI Guideline 2035 Part 1 has been in effect since 2005, and VDI Guideline 2035 Part 2 has been in effect since 2009.
SQ pumps have integrated dry-running protection that does not require a corresponding level sensor. If there is a lack of water, the pump is switched off after the preset current value is reached to prevent the motor from overheating.
As an installer, you have the choice of ordering Grundfos customer service from your specialist wholesaler or of contacting us directly.
De-energise the pump. Remove the screw in the centre of the nameplate. The shaft located beneath this has a groove. Place a screwdriver in the groove and move the shaft in the direction of rotation until you have removed the blockage.
Before installing the underwater cable on the motor, you need to make sure that the cable plug is clean and dry.
In the case of non-regulated fixed speed pumps, an overflow valve limits rising pressure when closing the radiator thermostat by moving the medium from the flow pipe to the return pipe.
The pump is running sluggishly or not at all. This can be remedied by replacing the capacitor.
The pump reacts to changing volume flows in the system by changing the speed. When thermostat valves and control valves are opening, the volume flow rises and the pump increases the speed.