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Deltec HLP Pumps are known for their high flowrate and pressure at relatively low power consumption. The range consists of five different models. If required, the pump performance can be selected through a 3 stage selector switch (except model 100/80). Energy savings of up to 60% are possible compared with conventional pumps. Deltec HLP Pumps are extremely quiet in operation. All Deltec HLP Pumps are protected by a thermic motor switch. Oxyd ceramic shafts and bearings run in water (hydrostatic bearings) and are therefore free of wear and tear. Deltec HLP
‘interval’ Pumps
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Deltec HLP Installation and Maintenance Information Initial Installation be aware that the pumps are supplied filled with fresh water to ensure that the hydrostatic bearings are kept full of water. This should be thrown away at time of installation. You have been warned and do not blame us when you take off the cap whilst sitting on your sofa at home and get a wet lap - it happens.
All models of HLP should be installed with a shut off valve either side of the pump to allow bleeding of the pump and to allow isolation for removal and cleaning. Shut off valves should be sized so that the bore of the valve is the same as the outlet/inlet of the pump which generally means one size bigger. Cleaning Never dismantle the pump to clean it as certain parts require special tools for correct alignment. To clean the pump simply block the suction pipe with the cap that is supplied and fill the pump with Ezyclean solution or with kettle descaler. This should then be left for a couple of hours to dissolve any calcium deposits or snail shells. Clean the pump out thoroughly and refit into the system. Intermittent cutting out of the pump The HLP pumps are fitted with hydrostatic bearings as described above which must be filled with water. if air gets into the bearing section then the pump will start to run hot and the thermo switch will cut off the pump until it cools down again - a safety feature to stop you burning out the pump. If this happens then the air must be bled from the pump.
Bleeding of HLP Pumps Later Models Later HLP models are fitted with a silver hexagon allen drive cap at the back of the pump. To bleed these models, whilst the pump is running, you simply unscrew the cap until you get a dribble of water coming out of the back of the pump. Now using the shut off valve fitted on the PRESSURE side of the pump, close it and open it sharply 2-3 times. You should see bubbles of air being forced out the back of the cap. Continue this until no more air is released and then tighten up the cap. Then do the same with the tap on the SUCTION side and you should see any air that is in the main housing of the pump being removed. Earlier Models With earlier models or with pumps installed where it is difficult to get to the back of the pump there is a different procedure. Close both shut off valves and remove the pump from the system. Take the pipe connector off the suction side of the pump and look inside. You should see in the centre of the impeller a screw which currently blocks a passage through to the bearing section of the pump. Remove the screw and install the pump back into the system. Now once again with the pump running, sharply close and open the tap on the SUCTION side of the pump. This is the opposite of the above method as you are trying to suck the air out and not force it through the pump. Each time you sharply close the tap you should see air exiting the pipe. Continue to do this until no more air comes out. Now do the same with the PRESSURE side a couple of times and then back to the SUCTION side. By now there should be no more air coming out and the pump should be running quieter with no air sounds and cool/not hot to the touch at the back. Now switch off the pump and remove it once again, put the screw back in the centre of the impeller then reinstall it back into place. The pump should now run normally.
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