Danfoss VMTD-F-B Evo Fact sheet

Fact sheet

Termix VMTD-F-B Evo

Direct substation for flats, decentralized systems, single and multi-family houses

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

Application

The Termix VMTD-F-B Evo is a com­plete solution with built-in water
heater and a differential pressure
controlled heating 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 fitting piece and sensor pock­ets for insertion of a heat meter as
well as strainer and ball valves.

Heating (HE)

The heating circuit is designed for di­rect generation of heat. The differential
pressure control sets the optimum op­eration conditions the heating system;
radiators, as well as under floor heat­ing distribution. To enable a time-de­pending 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 tempera­ture 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 over­heating and lime scale formation.
The heat exchanger cools the DH
water very efficiently, thereby creat­ing a very good operating economy.
The sensor 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 operation. The sensor
accelerator helps to ensure a stable
hot water temperature 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
available with DHW circulation;
including pump, built-in non-re­turn valves and safety valve. The
station can also be supplied with
a thermostatic circulation 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-lacquered steel cover for
on-wall mounting or a recess box
with door for in-wall mounting.

www.danfoss.com

CIRCUIT DIAGRAM - EXAMPLE

DHW

DCW

DCW

DH

Supply

DH

Return

Technical parameters:

Nominal pressure: PN 10
DH supply temperature: T
DCW static pressure: P
Brazing 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 242 mm
With cover (built-in wall variant):
H 910 × W 610 × D 150 mm

41A

41B

14

9

14

= 120 °C

max

= 0.5 bar

min

B Heat exchanger DHW
7 Thermostatic valve
9 Strainer
14 Sensor pocket, heat meter
31 Differential pressure

controller
39 Connection closed
41A Fitting piece, Cold water

B

7

48

31

Connections:

1. Hot water circulation, optional (HWC)

2. Domestic cold water (DCW)

3. Domestic hot water (DHW)

4. Domestic cold water out (DCW)

5. District heating (DH) supply

6. District heating (DH) return

7. Heating (HE) supply

8. Heating (HE) return

1 2 3

25

99 65

65

9 69A

4 5 6

65

65

528

7 8

65 65

45

39

39

39

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

mains ¾” × 110 mm
41B Fitting piece, heat meter

¾” × 110 mm
48 Air vent, manual
69A On / off valve, only valve

HE
Supply

HE
Return

CAPACITY, WEIGHT AND DIMENSIONS

CAPACITY, WEIGHT AND DIMENSIONS

Substation type

VMTD - F -B- 1

VMTD - F -B- 2

VMTD - F -B- 3

VMTD - F-B - 4

DHW capacity

[kW]

33 60 20 10 / 45 25 810
40 70 20 10 / 50 25 858
50 60 20 10 / 45 40 1228
58 70 20 10 / 50 40 1247
65 60 20 10 / 45 40 1597
75 70 20 10 / 50 40 1612
68 60 20 10 / 45 30 1653
85 70 20 10 / 50 30 1824

© Danfoss | DCS-SDGPT/ PL | 2021.09

Supply flow

primary

[°C]

Return flow

primary

[°C]

DCW / DHW

[°C]

Pressure loss

primary

[kPa]

AM235686478874en-010301

Flow rate

secondary

[l/h]