The Grundfos SCALA2 3-45 supplies clean water for household taps, showers and garden watering. Its variable-speed motor responds to changes in water use, helping keep outlet pressure steady as taps open and close. The pump, controller, pressure sensor, pressure tank and non-return valves are integrated into one compact unit.
Rated duty: 50LPM at 27m head.
Maximum flow: 76.7LPM.
Maximum head: 45m.
The rated duty gives a flow and head together. Maximum flow and maximum head occur at different operating points. Available flow falls as the pump works against more head; pipe losses and height differences also affect pressure at the tap.
Inlet: 1" BSP male thread.
Outlet: 1" BSP male thread.
Set the outlet pressure with the up and down buttons on the control panel. The setting changes in 50kPa steps from 150 to 550kPa; the factory setting is 300kPa. The indicator lights show the selected pressure.
Settings of 400–550kPa require water that is already under pressure as it enters the pump. The pump then adds to that incoming pressure. These settings are not suitable for drawing from a tank below the pump. Grundfos limits the pressure increase between inlet and outlet to 350kPa when choosing a setting; an installer should select a setting the pump can maintain at the required flow.
Use clean, fresh water at 0°C to 45°C. Sand and debris can wear or block the pump; use suitable inlet filtration where the water source requires it.
Self-priming means the pump can clear air from the inlet pipe and draw water up to the pump after its housing has been filled with water. Before starting, remove the priming plug, pour at least 1.7L of clean water into the pump housing and refit the plug. Do not switch it on with an empty housing or let it run without a water supply.
Maximum suction lift is 8m; pipe resistance and inlet conditions affect the usable lift. Install on a firm base with drainage and protection from frost, following the installation instructions.
Dry-running and thermal protection help protect the pump. The built-in tank needs no separate pressure tank for normal operation. Check its gas precharge annually and when changing the pressure setting; Grundfos recommends 70% of the selected outlet pressure, checked with the water side depressurised. The installation instructions explain the procedure.
Supplied with a 1.5m power lead and Australian three-pin plug for a 200–240V single-phase, 50/60Hz supply.
Two-year Grundfos Australian consumer warranty from purchase, subject to its terms.
Grundfos SCALA2 Installation & Operating Instructions
Grundfos SCALA2 Data Sheet
Grundfos SCALA2 Australian Safety Instructions
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