Fact sheet

Termix VMTD-F-B Evo Direct substation for flats, decentralized systems, single and multi-family houses

Application

The Termix VMTD-F-B Evo is a complete solution with built-in water heater and a differential pressure controlled heat-ing system. Termix VMTD-F-B Evo is applicable for single and multi-family houses and for decentralized systems.

District heating (DH)

The substation is prefabricated with a differential pressure controller, a fit-ting piece and sensor pockets for inser-tion of a heat meter as well as strainer and ball valves.

Heating (HE)

The heating circuit is designed for di-rect generation of heat. The differential pressure control sets the optimum op-eration conditions the heating system; radiators, as well as under floor heating distribution. To enable a time-depend-ing temperature control program, the station is equipped with a zone valve; an actuator and a room thermostat can be included as an option.

Domestic hot water (DHW)

The domestic hot water is prepared in the heat exchanger and the tempera-ture is regulated with a thermostatic control valve. The patented sensor accelerator accelerates the closing of the Danfoss AVTB valve and protects the heat exchanger against overheat-ing and lime scale formation. The heat exchanger cools the DH water very efficiently, thereby creating a very good operating economy. The sen-sor accelerator and AVTB valve also works as a bypass keeping the house supply line warm. This shortens the waiting periods during summer when the heating system is in reduced op-eration. The sensor accelerator helps to ensure a stable hot water tempera-ture regardless of varying loads, flow temperatures and differential pressure without the need for readjusting the valve.

Options

The Termix VMTD-F-B Evo is also avail-able with DHW circulation; including pump, built-in non-return valves and safety valve. The station can also be supplied with a thermostatic circula-tion valve.

Construction

All pipes are made of stainless steel. The connections are made by nuts and gaskets. The Termix VMTD-F-B Evo can be delivered with white-lac-quered steel cover for on-wall mount-ing or a recess box with door for in-wall mounting.

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FEATURES AND BENEFITS

• Substation for DH and decentralized systems

• Direct heating and DHW temperature regulation with a thermostatic control valve

• Capacity: 33 – 85 kW for DHW

• DHW in sufficient quantity

• Operates independently of differential pressure and flow temperature

• Minimum space required for installation

• Pipes and plate heat exchanger made of stainless steel

• Minimized risk of lime scale and bacteria formation

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VL.LZ.Q2.02 © Danfoss | DHS-SMT/ PL | 2018. 01

Substation type DHW capacity [kW]

Supply flow primary

[°C]

Return flow primary

[°C]

DCW / DHW [°C]

Pressure loss primary

[kPa]

Flow rate secondary

[l/h]

VMTD - F - 133 60 20 10 / 45 25 81040 70 20 10 / 50 25 858

VMTD - F - 250 60 20 10 / 45 40 122858 70 20 10 / 50 40 1247

VMTD - F - 365 60 20 10 / 45 40 159775 70 20 10 / 50 40 1612

VMTD - F - 468 60 20 10 / 45 30 165385 70 20 10 / 50 30 1824

CAPACITY, WEIGHT AND DIMENSIONSCAPACITY, WEIGHT AND DIMENSIONS

B Plate heat exchanger DHW

7 Thermostatic valve9 Strainer14 Sensor pocket, heat meter31 Differential pressure

controller39 Connection closed41A Fitting piece, Cold water

mains ¾” × 110 mm41B Fitting piece, heat meter

¾” × 110 mm48 Air vent, manual69A On / off valve, only valve

Technical parameters:Nominal pressure: PN 10DH supply temperature: Tmax = 120 °C DCW static pressure: Pmin = 0.5 barBrazing material (HEX): Copper

Weight incl. cover: 20 kg (incl. packing)

Cover options: - On-wall - Built-in wall

Dimensions (mm):Without cover: H 590 × W 530 × D 150 With cover (mount on wall variant): H 800 × W 540 × D 190 mm With cover (built-in wall variant):H 910 × W 610 × D 150 mm

Connections sizes:DH + HE: G ¾” (int. thread)DCW + DHW: G ¾” (int. thread)

Options:• Mounting rail with ball valves• White-lacquered steel cover (on-wall)• Built-in wall cover• Hot water circulation, incl. pump, non-return valves and safety valve (10 bar)• Safety valve with thermostatic circulation set• Thermostatic circulation set• Pressure equalizer (GTU)• Room thermostat• Actuator for zone valve• Return temperature limiter• Thermometer• Ball valves

Connections:1. Hot water circulation, optional (HWC)2. Domestic cold water out (DCW)3. Domestic cold water (DCW)4. Domestic hot water (DHW)5. District heating (DH) supply6. District heating (DH) return7. Heating (HE) supply8. Heating (HE) return

DCW

DCW

DHSupply

DHReturn

41A

14 9

41B 14 31

B

7

HESupply

HEReturn

25

1 2 3 4 5 6 7 8 45

528

99 65 65 65 65 65 65 39

39

48

9 69A

39

39

CIRCUIT DIAGRAM - EXAMPLES

DHW

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