Grundfos UNILIFT AP12.50.11.3 suits rainwater, groundwater and suitable non-aggressive grey-water drainage, with a maximum flow of 533.4L/min and maximum head of 18m. These are separate limits. Actual flow depends on lift and pipe resistance; the matching 50Hz performance curve helps assess expected flow for the installation. Performance is 120L/min at approximately 14.8m head.
The outlet is 50mm (2") Rp / BSP female thread. Maximum particle diameter is 12mm. The pump suits water containing small amounts of suspended solids, but not sewage, long fibres, stones or aggressive and flammable liquids.
It has no float switch, allowing supervised pumping or operation through suitable external level controls. Monitor the water level because the pump has no automatic low-water stop.
Maximum installation depth is 7m with the 10m cable. Keep at least 3m of cable above liquid level. Install on a firm base clear of sludge and mud. Keep the inlet strainer covered during pumping and do not run dry.
This version uses a 400V three-phase, 50Hz supply and has a 10m cable without a plug. Rated motor output P2 is 1.2kW and input power P1 is 1.9kW. This no-float version needs a separately provided motor starter and motor protection matched to the nameplate current. Automatic level operation also needs a suitable level switch and controller. Electrical connection and rotation checks must follow the installation instructions.
Suitable liquid temperature is 0-55°C and pH is 4-10. The pump can operate upright or horizontally with its outlet at the highest point. For permanent installations, Grundfos recommends a union, non-return valve and isolating valve in the outlet pipe. Lift the pump by its handle.
The stainless-steel housing and semi-open stainless-steel impeller provide a compact drainage pump for portable or permanent use. A cooling jacket directs pumped liquid around the motor, supporting partly submerged operation while the inlet strainer remains covered. The removable inlet strainer gives access for cleaning.
Two-year manufacturer warranty, subject to Grundfos warranty terms and applicable consumer rights.
Grundfos UNILIFT AP12 Official Range Catalogue
AP Installation & Operating Instructions
AP Three-Phase Control Box Instructions
