Grundfos - Mini Monopress - Basic Set

Grundfos - Mini Monopress - Basic Set - GR-MMP50801

Basic set, designed for wall mounting MMP50801.

The Mini Pressurisation Unit is a compact wall mounted unit housing either one or two small pressurisation pumps and associated control equipment for connecting to small Heating or Cooling installations within large domestic dwellings or small industrial / commercial installations.

All the equipment is mounted within an a white powder coated pump casing with a flush mounted pressure instrumentation gauge, mounted on the front of the unit, to indicate the system pressure. Within the cabinet, is housed a small make-up tank complete with a system filling valve assembly, complying with the Water Regulations Guide, a small hydraulic pump capable of producing a pressure of between 0.7 to 2.4 bar, pressure control switch, control circuit fuse, terminals and all necessary wiring to achieve the correct operation.

Suitable connections are provided to allow system makeup, tank overflow and connection to the system pipework system installation as well as electrical terminals for connecting the single phase, live, neutral and earth supply.

Electrical connections:- The unit should be connected to 240V single phase supply. The unit is internally fused with a 2A fuse.

Customer connections:- Customer connections are accessed from the bottom of the unit. All connections are on 52 mm centres from the rear face of the unit. See drawing

Adjustment of Control pressure switch:- The control pressure switch is factory set for 1 Bar. In the unlikely event that this pressure is not acceptable and has to be adjusted within the operating range of the pump, i.e. maximum 2.4 Bar, the following procedure should be adopted:- Isolate the unit and remove cover screws and cover to access the pressure switch. The pressure setting can be adjusted by turning the knurled knob on the pressure switch to the desired value, using the pressure instrumentation gauge as a guide.

Technical data:-

Pump Unit - Self priming piston pump, type 508LA, max. flow 80 litres/hour max. generated pressure 2.4Bar.

Pump connection 1/8". Nominal power consumption 25W

Make up tank - 4.5 litre capacity. Complies to WRC byelaw 11 regulation.

System connection 1/4" BSPF, Water inlet connection 1/2"BSPM, overflow connection 3/4"

Pressure switch - Type 100SS, adjustment range 0.7bar to 6.0bar, 15amp @ 250VAC. Overpressure 10bar (Note that pump maximum pressure is 2.4 bar) pressure instrumentation gauge - 50 mm diameter Scaled 0..6 bar (Dual scale)

Weights and Dimensions:- Weight 8.5Kg empty. Dimensions 350 x 300 x 200mm (W x H x D)

Real-world product applications

• Pumping viscous liquids and sludge-like media
• Handling fluids with suspended solids or delicate media
• Supporting dosing or metered transfer in process systems
• Transferring thick fluids between tanks or stages
• General industrial fluid handling where steady flow is needed

Grundfos (est. 1945) is a Danish pump manufacturer known for high-efficiency circulators, multistage boosters, borehole and wastewater pumps, plus packaged pressure systems. The range covers HVAC circulation, domestic hot water recirculation, pressure boosting, industrial water transfer and public water management, with strong focus on energy efficiency and intelligent controls.