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M2 MIX4 DN25

2-WAY PUMP UNIT WITH 4-WAY MIXING VALVE

The unit for 1” (180 mm) circulating pumps consists of:

Supply
• Connection.
• 4-way mixing valve.
• 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).
• Connection.

Centre distance 125 mm. EPP insulation box (Dimensions: 250x380x170 mm).
PN 10, max temperature 110°C (unit without pump).
External connections: 1” Female.

FIELD OF USE
For power up to 28 kW (with ∆t 20 K) and maximum flow rate 1200 l/h.
Kvs Value: 5.0.
Approximate data calculated with a 6 m head circulating pump. For an accurate sizing or for higher flow rates, please refer to the curves shown in the instructions.

Available circulating pumps:
Wilo Para 25/6 SC
Grundfos UPM3S Auto 25-60 
Wilo Para 25/8 SC 

Code
Specifications
External connections
Circulator
Servomotor
20355R-M4 G 1" Female - -
20355R-M4-P6 G 1" Female Wilo Para 25/6 SC -
20355R-M4-A6 G 1" Female Grundfos UPM3S Auto 25-60 -
20355R-M4-P8 G 1" Female Wilo Para 25/8 SC -
20355R-M4-M21 G 1" Female -
20355R-M4-AHC G 1" Female - ● With weather-compensated controller
20355R-M4-P6-M21 G 1" Female Wilo Para 25/6 SC
20355R-M4-A6-M21 G 1" Female Grundfos UPM3S Auto 25-60
20355R-M4-P8-M21 G 1" Female Wilo Para 25/8 SC
20355R-M4-P6-AHC G 1" Female Wilo Para 25/6 SC ● With weather-compensated controller
20355R-M4-A6-AHC G 1" Female Grundfos UPM3S Auto 25-60 ● With weather-compensated controller
20355R-M4-P8-AHC G 1" Female Wilo Para 25/8 SC ● With weather-compensated controller

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