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.
As an installer, you have the choice of ordering Grundfos customer service from your specialist wholesaler or of contacting us directly.
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.
Night set-back is activated (if configured to do so) through the feed temperature of the heat generator.
The pump reacts to changing volume flows in the system by changing the speed.