Danfoss VVX-B Fact sheet
Fact sheet
Termix VVX-B
District heating substation for indirect heating and instantaneous domestic hot water with thermostatic control.
Application
The Termix VVX-B is a complete solution
for hot water and space heating with optimal safety, ecient energy transfer, service-friendly construction and a compact
design. The substation is used if a heat exchanger is required or on a conversion to
district heating where the existing equipment is unsuitable for direct connection.
District heating (DH)
The substation is prefabricated with adifferential pressure controller, tting piece
and sensor pockets for insertion of a heat
meter as well as strainers and ball valves.
Heating (HE)
The heating side consists of a plate heat
exchanger, safety valve, manometer,
thermometers, ball valves, drain valve, air
valve, expansion vessel and circulation
pump. The temperature of the heating
can be controlled thermostatically or by an
electronic controller with an outdoor temperature sensor. Depending on the application, dierent heat exchangers
dimensioned for central or underoor
heating can be used.
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 sensor accelerator helps to
ensure a stable hot water temperature
by varying loads, ow temperatures and
dierential pressure without the need for
readjusting the valve. The heat exchanger
cools the DH water very eciently, 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
Options
The water heater can be supplied with
built in nonreturn valve and safety valve
mounted in the cold water supply. The
water heater 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 VVX-B is
completed by a white steel cover in
modern and attractive design.
FEATURES AND BENEFITS
• Substation with high eciency brazed
plate heat exchangers for properties
of between 1 to 30 apartments, made
from acid-proof stainless steel
• Wall-mounted construction
• Suitable for new buildings as
well as renovation projects
• Small, lightweight, compact construction
• Electronic controllers for heating
and domestic hot water systems
• Advanced gasket system - primary side
• Fast and reliable delivery
• Danfoss substations and heat exchangers
are manufactured according to European
Pressure Directive PED 9979797/23/WE
www.heating.danfoss.com
CIRCUIT DIAGRAM - EXAMPLE
DHW
DCW
Circ.
DH
Supply
DH
Return
Technical parameters:
Nominal pressure: PN 10*
DH supply temperature: Tmax = 120 °C
DCW static pressure: Pmin = 0.5 bar
Brazing material (HEX): Copper
*PN 16 versions are available on enquiry
Weight incl. cover: 35 kg
(incl. packing)
Cover: White-lacquered steel
Dimensions (mm):
Without cover: H 810 × W 525 × D 360
With cover: H 810 × W 540 × D 430
A Plate heat exchanger HE
B Plate heat exchanger DHW
1 Ball valve
4 Safety valve
7 Thermostatic valve
9 Strainer
10 Circulation pump
14 Sensor pocket, heat meter
Connections:
1. District heating (DH) supply
2. District heating (DH) return
3. Heating (HE) supply
4. Heating (HE) return
5. Domestic hot water (DHW)
6. Domestic cold water (DCW)
wall
seen from above
Connections sizes:
DH + HE: G ¾“ (int. thread)
DCW + DHW: G ¾“ (int. thread)
18 Thermometer
20 Fitting-drain valve
26 Manometer
31 Dierential pressure controller
38 Expansion vessel
41 Fitting piece, heat meter
48 Air escape, manual
HE
Supply
HE
Return
Options:
• Cover, white-lacquered steel
(Design Jacob Jensen)
• Safety valve
• GTU Pressure equalizer
• Circulation set, Danfoss MTCV
and check valve
• Booster pump (increases DH ow)
• Pipe insulation
• Mixing circuits for under oor heating
• Underoor heating manifold system
• Safety thermostat surface type
• Weather compensation,
electronic controls
• Filling line, rell from DH
for heating circuit
• Room thermostat
• Zone valve with actuator
• Air screw (DH supply)
DHW: CAPACITY EXAMPLES, 10°C / 50°C
Substation
type
VVX 1-x
VVX 2-x
VVX 3-x
DHW
capacity
Supply flow
primary
[°C]
33 60 20 10/45 25 810
40 70 20 10/45 40 1228
50 60 20 10/45 40 1228
58 70 20 10/45 40 1247
65 60 20 10/45 40 1597
75 70 20 10/45 40 1612
[°C]
Return flow
primary
[°C]
DCW/DHW
[°C]
Pressure
loss primary
[kPa]
Flow rate
secondary
[l/h]
HEATING: CAPACITY EXAMPLES
Substation
type
VVX x-1
VVX x-2
VVX x-3
Heating
capacity
Heating
circuit
primary
[ kW]
18 70/40 35/60 25 650
20 80/45 40/70 25 603
24 90/45 40/70 25 724
30 70/40 35/60 35 1084
34 80/45 40/70 35 1025
40 90/45 40/70 35 1206
45 70/40 35/60 45 1629
50 80/45 40/70 45 1509
54 90/45 40/70 45 1629
[°C]
Gemina Termix A/S · Member of the Danfoss Group · Navervej 15-17 · DK-7451 Sunds · Denmark
Tel.: +45 9714 1444 · Fax: +45 9714 1159 · mail@termix.dk · www.heating.danfoss.com
© Danfoss | DHS-SRMT/ PL | 2016.02
Heating
circuit
secondary
[°C]
Pressure
loss
primary
[ kPa]
Flow rate
secondary
[l/h]
VC.LB.B4.02
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