Danfoss VMTD-MIX-B Fact sheet

Fact sheet

Termix VMTD-MIX-B

Direct substation for flats, single and multi-family houses with up to 7 apartments

Application

The Termix VMTD MIX-B is a complete solu
tion with built-in water heater and heating
system with differential pressure control
and mixing loop. The Termix VMTD MIX-B is
applicable for for single-family houses and
for decentralized systems in multi-family
houses.

District heating (DH)

The substation is prefabricated with a differ
ential pressure controller, fitting piece and
sensor pockets for insertion of a heat me
ter as well as strainers and ball valves. Fur­thermore the substation is delivered with
a mixing loop including pump, controls and
non-return valve.

Heating (HE)

The heating circuit is designed for direct
connection. The differential pressure con
troller sets the optimum operation condi­tions for radiator thermostats in order to
enable individual temperature control in
each room. The mixing loop creates a suit
able temperature level e.g. for floor heating.
In order to enable a time-dependent tem
perature control program, a zone valve

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with 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 reg
ulated with a thermostatic control valve.
The patented sensor accelerator acceler
ates 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 accelera
tor and AVTB valve also works as a bypass
keeping the house supply line warm. This
shortens the waiting periods during sum
mer when the heating system is in reduced
operation. The sensor accelerator helps
to ensure a stable hot water temperature
regardless of varying loads, flow tempera
tures and differential pressure without the
need for readjusting the valve.

Options

The substation can be supplied with
a (built-in) non-return valve and safety

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valve mounted in the cold water supply.
The substation 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 can be deliv­ered with white-lacquered steel cover in
modern design.

FEATURES AND BENEFITS

• Substation for DH and
decentralized systems

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

• Capacity: 33 – 75 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

www.danfoss.com

Danfoss Randall Ltd . • Unit A4, Centre Point Business Park, Oak Road • Dublin 12 • Ireland

CIRCUIT DIAGRAM - EXAMPLE

DHW

DCW

B Heat exchanger DHW

1

B

7

1

39

39

1 Ball valve
2 Non-return valve
7 Thermostatic valve
9 Strainer
10 Circulator pump
14 Sensor pocket, heat meter
18 Thermometer
31 Differential pressure controller
39 Connection closed
41 Fitting piece, heat meter

DH

Supply

DH

Return

Technical parameters:

Nominal pressure: PN 16
DH supply temperature: T
DCW static pressure: P
Brazing material (HEX): Copper

Weight excl. cover: 25 kg
(incl. packing)

Cover: White-lacquered
steel sheet

Dimensions (mm):

Without cover: H 550 × W 530 × D 280
With cover: H 550 × W 540 × D 360

14 9

= 120 °C

max

= 0,5 bar

min

7311441

Connections:

1. District heating (DH) supply

2. District heating (DH) return

3. Floor heating (FH) supply

4. Floor heating (FH) return

5. Domestic hot water (DHW)

6. Domestic cold water (DCW)

7. Heating (HE) supply

8. Heating (HE) return

seen from above

10

2

wall

18

HE
Supply

HE
Return

Connections sizes:

DH + FH +HE: G ¾“ (int. thread)
DCW + DHW: G ½“ (int. thread)

Options:

• Booster pump (increases DH flow)

• White-lacquered steel cover

• Safety valve and non-return valve (10 bar)

• Safety valve with thermostatic circulation set

• Thermostatic circulation set

• Pressure equalizer (GTU)

• Room thermostat

• Zone valve with actuator

• Air screw (DH supply)

CAPACITY, WEIGHT AND DIMENSIONS

CAPACITY, WEIGHT AND DIMENSIONS

Substation type

VMTD – 1

VMTD – 2

VMTD – 3

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

Supply flow

primary

[°C]

Return flow

primary

[°C]

DCW / DHW

[°C]

Tel.: [phone] • Fax: [phone] • [e-mail] • www.dh.danfoss.com

© Danfoss | DHS-SRMT/ PL | 2016 . 03

Pressure loss

primary

[kPa]

Flow rate

secondary

[l/h]

VC.LB.D3.15