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M2 MIX33 PDC DN20

2-WAY PUMP UNIT WITH 3-WAY MIXING VALVE WITH BUILT-IN BY-PASS AND FLOWMETER

The unit for 1/2” (130 mm) circulating pumps consists of:

Supply
• Connection.
• 3-way mixing valve with adjustable by-pass. Through the by-pass (adjustable from the front part) it is possible to mix on the supply line a quantity of water coming back from the return line of the system.
• High efficiency synchronous pre-wired circulating pump (for the models that include it).
• Flanged ball valve supplied with in-handle thermometer (red ring, range 0°C-120°C).

Return
• Flanged ball valve with 20 mbar check valve (which can be excluded by rotating the handle by 45°) supplied with in-handle thermometer (blue ring; 0°C-120°C).
• Straight flowmeter with flow regulation, 1” male threaded. Direct reading of the flowrate through the graduated scale.
• “T” Connection for mixing valve.
• Connection.

Centre distance 90 mm. EPP insulation box (Dimensions: 180x302x142 mm).
PN 10, max temperature 110°C (unit without pump).
Connections: 3/4” Male with swivel shank to the heat source or to the
zone manifold. 3/4” Female to the user.

FIELD OF USE
For power up to 30 kW (con ∆t 15 K) and maximum flow rate 1700 l/h.
Valore Kvs: 4.8.
Approximate data calculated with a 8 m head circulating pump.

Available circulating pumps:
Wilo Para 15/6 SC 
Grundfos UPM3S Auto 15-60 
Wilo Para 15/8 SC

Flow rate ranges
42 = 5-42 l/min

Code
Specifications
Manifold connections
System connections
Circulator
20255R-M33-42 G 3/4" Male G 3/4" Female -
20255R-M33-42-P6 G 3/4" Male G 3/4" Female Wilo Para 15/6 SC
20255R-M33-42-A6 G 3/4" Male G 3/4" Female Grundfos UPM3S Auto 15-60
20255R-M33-42-P8 G 3/4" Male G 3/4" Female Wilo Para 15/8 SC

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