products data sheets

Mixing Unit

Key Features

  • Adjustable temperature range from 20o C to 70o C making it suitable for screed drying purposes
  • Thermostatic mixing valve with a remote sensor for accurate control of flow temperature
  • Easy to use the thermostatic head with temperature locking feature
  • Flow increase valve to increase the flow rate for larger manifolds/heat outputs
  • Built-in non-return valve to aid filling during commissioning
  • 1” male close coupled primary flow and return connections
  • 1” male manifold connections with the union for fast assembly / removal
  • Optional ball valve set for fitting to 1” M primary connections
  • Valve body kv range: 3.0 – 4.8
  • Built -in manual air vent
  • Built-in temperature gauge

The TM3 Control Group has a uniquely designed mixing valve at its heart which ensures accurate temperature control of underfloor heating. The unique design of the internal mixing valve components ensures that hot water from the heat source and return water from the underfloor circuit are mixed together in the valve body to produce a range of temperatures from 20oC to 70oC. This range of temperatures suits the whole field of underfloor heating applications, from commissioning new floor screeds to operating with very thick floor screeds in commercial applications. The illustrations below show how the mixing valve operates through its remote sensing thermostatic head:

Low Temperature Mixing

Initially, the cool liquid in the remote sensing probe allows almost all of the primary hot water from the heat source through the valve. Gradually the temperature of the probe rises as the underfloor circuits begin to warm up.
Depending on the temperature setting of the thermostatic head, as the temperature of the probe rises, the shuttle starts to close off the primary hot water allowing return water to maintain the temperature set on the head, up to 70o C if required.
Once the temperature set on the head has been reached at the probe, the shuttle balances the right amount of primary hot water and secondary return water to maintain this temperature. Depending on the thermostat setting, the hot water could be almost completely closed off allowing very low temperatures suitable for commissioning screed floors right down to 20o C if required.

The thermostatic mixing valve has a flow increase valve which allows return water to flow directly into the mixed water outlet. This cools the mixed water temperature sensed by the remote phial and causes the mixing valve to open allowing more primary hot water through the mixing chamber and raises the temperature to the setting on the head.

Unit Parameters
Technical Parameters

Technical data
Max temperature for primary circuit: 90 °C
Max operating pressure: 6 bar
ΔP max for primary circuit: 1 bar
Secondary range: 20 – 65 °C (fixed-point regulation)
Thermal power exchangeable ΔT 7°C, ΔP useful 0,25 bar

Fixed-point regulation: 10 kW by-pass position 0

Fixed-point regulation: 12.5 kW by-pass position 5

Pressure drop with by-pass valve position 5: Kvmax=4,8

Mixing valve pressure drop (climatic regulation): Kv 4

Thermometer scale: 0 – 80 °C

Head threads of Mixing group: 1” Female

Head threads of Topway manifolds: G 1″ Female

Topway manifolds takeoffs threads: 24×19 tekeoffs 50 mm

Wilo Yonos Para RS 25/6 circulator pump
Connections – takeoffs: G1”1/2 – 130 mm
Rotation speed: 800 – 4250 rpm
Fluids that can be used:
Water cooling and heating – Water and glycol: max 1:1
Max static pressure: 6.2 m – Max delivery capacity: 3.3 m3/h
Max temperature water: 95 °C (at room temperature of 57 °C)
Max temperature water: 90 °C (at room temperature of 59 °C)
Max temperature water: 70 °C (at room temperature of 70 °C)
Electrical connection 1~230 V, 50/60 Hz
Protection class IPX 4D, of insulation F
Nominal motor power: 37 W Electrical consumption from 1~230 V: 3 – 45 W
Power absorbed from 1~230V: 0.03 – 0.44 A

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