Danfoss VX-F Fact sheet
Fact Sheet
VX-F flat station for indirect heating and DHW
District heating substation for indirect heating and instantaneous domestic hot water. For apartments, single- and multi-family houses
Application
Die VX-F is a compact substation featuring high
performance and simple operation. The VX-F is
especially suitable for two-pipe systems and systems
with radiator or floor heating, supplied from a
secondary connected district heating system, a block
heating system or a centrally located boiler system in a
block of flats.
The VX-F range is available as built-in variant with a
recess box in sizes W 690 x H 1350 x D 150 and W 850 x
H 1350 x D 150 or as wall-mounted variant.
The VX-F stations are prepared for mounting separately
or for implemetation with with a VX-F distribution unit
with 3 to 12 heating circuits.
District heating (DH)
The flat station is prefabricated with interconnecting
components such as differential pressure controller,
strainer, thermal bypass and fitting piece and sensor
pockets for insertion of a heat meter.
Heating (HE)
The heating side consists of plate heat exchanger, safety valve, manometer, expansion vessel and A-labelled
low-energy circulation pump. A flow temperature controller, type FTC is used for flow temperature control
of the heating system. The VX-F stations are equipped
differently depending on the application, - floor heating
or radiator heating. VX-F stations for floor heating are
equipped with a safety thermostat and a zone valve
RA-C / thermal actuator TWA to prevent overheating.
Domestic hot water (DHW
The domestic hot water is prepared in the heat exchanger based on the flow principle and the temperature is regulated by the self-acting controller with in-
tegrated differential pressure controller - the PTC2+P
with energy-saving function. Supreme ease of operation is obtained via the combined hydraulic and
thermostatic regulation of the PTC2+P controller. The
pressure-controlled part allows primary and secondary side flow through the heat exchanger, only when
hot water is tapped and blocks the flow immediately
after completion of the tapping process.
The thermostatic part controls the domestic hot water temperature. Thanks to the quick-acting hydraulic
control of the heat exchanger, it is largely protected
from the formation of lime scale and growth of bacteria.
The PTC2+P controller with integrated differential
pressure controller compensates for variations in supply temperature and varying differential pressure and
thereby ensures a constant domestic hot water temperature at all times. A thermostatic bypass enables
tapping of hot water without any delay, – ensuring the
best possible efficiency and economy. For registration
of the cold water consumption the VX-F is equipped
with a fitting piece for mounting of a cold water meter
in the DCW inlet.
Options
The VX-F is equipped with bypass function as a standard, but it is prepared for DHW circulation. Equipment for DHW circulation is optional and must be
ordered separately.
Design
All pipes are made of stainless steel. The connections
are made by nuts and gaskets. The Akva Lux II can be
delivered with white-lacquered steel cover for recess
mounting or for wall mounting. The VX-F is supplied
without recess box and door as standard. - This is
optional must be ordered separately
.
FEATURES AND BENEFITS
FEATURES AND BENEFITS
• Indirect heating, DHW heating based on
flow principle
• Innovative, energy-saving controller
PTC2 + P in combination with high
performance heat exchanger for ondemand water heating without no-load
losses function
• Thermostatic control of heating (HE)
temperature
• Capacity: 15 kW HE / 37-55 kW DHW
• Minimum space required for installation
• For mounting in recess box or on the wall
• Pipes and heat exchanger made of
stainless steel
• Minimized risk of lime scale and bacteria
formation
www.danfoss.com
SHALTPLAN - BEISPIEL
CIRCUIT DIAGRAM - EXAMPLE - Variant with floor heating and circulation
DHW
DCW
DCW
DHW circ.
Circulation set 145H3985
DH
Supply
DH
Return
Design specifications:
Nominal pressure (prim/sec.): PN 16
Max. suppy temperature: 100 °C (design temp.)
Min. ΔP: See capacity examples
DCW static pressure: p
Brazing material (HEX): Copper
min
= 2 bar
Weight w/o cover.: Max. 30 kg
(incl. packing)
Dimensions (mm): H 945 × W 561 × D 150
Electrical supply: 230 V AC
Recirculation:
Remember to order circulation set for systems that
feature DHW recirculation.
1 Plate heat ex changer HE
2 Plate heat ex changer DHW
4 Differential pressure controller
5 Strainer
6 Non-ret ur valve
7 Ball valve
8 Circulatio n pump HE 230 V
9 Circulatio n pump DHW
11 Safety va le HE 3 bar ½”
12 Safe ty valve DHW 10 bar ½”
15 Manometer
16 Exp ansion vessel 10 L
17 Air vent
19 Fill / Drain val ve
23 Sensor poc ket for heat meter ½”
24 Fitting pi ece for heat meter 3/4” x 110 mm
Circ.
Dimensional sketch:
Connection sizes:
DH: G ¾“ (ET)
DCW, DHW, HE: G ¾“ (ET)
Circulation: R ½“ (IT)
29 Actu ator TWA
30 Ther mostat FTC/RAC
33 Blin d plate
38 PTC2 con troller
40 Danf oss FJVR for bypass/circulati on
52 Zone val ve RA-C
57 Safe ty thermostat ST55
HE
Supply
Floor heating
Supply
Floor heating
Return
HE
Return
Connections:
1. Domestic cold water (DCW)
2. Domestic hot water (DCW)
3. Domestic hot water (DCW)
4. District heating (DH) Supply
5. District heating (DH) Return
6. Heating (HE) Supply
7. Heating (HE) Return
Accessories and options:
Recess box B690 x H1350 x D150 mm: 145H4044
Door for 145H4044 incl. of mounting rail: 145H4104
Recess box B850 x H1350 x D150 mm: 145H4105
Door for 145H4105 incl. of mounting rail: 145H4106
Circulation set: 145H3985
Mounting feet for recess box (2 pcs.) 145H4232
Mounting rail incl. of ball valves 145H4195
Variants:
145F3900: VX-F Floor heating w/zone valve, ST55
145F3901: VX-F Floor heating w/zone valve, ST55, circ.
145F3902: VX-F radiator heating w/RA-C/FTC
145F3903: VX-F radiator heating w/RA-C/FTC, circ.
DHW: Capacity examples, 10 °C/50 °C
DHW
Typ e
XB 06H+-1 40
XB 06H+-1 40
XB 06H+-1 40
* heat meter not incl.
Capacity
kW
37
45
55
Tem p.
primary
60/18. 22 10/50
60/18.91 10/50
60/19.77 10/50
[°C]
Tem p.
sekundary
[°C]
Pressure
*primary
Flow rate
loss
primary
27 762,5 13,2 6
40 942,9 16,13
59 117 7,1 19.70
[l/h]
Flow rate
secundary
[l/min]
Heating: Capacity examples
Heating
Typ e
Capacity
XB 06H-1 16 10 70/40,35 35/60 38 28 7,4 346,8 5
XB 06H-1 16 10 60/30,75 30/40 62 294,4 865,2 27
* heat meter not incl.
kW
Tem p.
primary
[° C]
Tem p.
sekundary
° C]
Danfoss Redan A/S · District Heating · Omega 7, Søften · DK-8382 Hinnerup · Denmark
Tel.: +45 87 43 89 43 · Fax: +45 87 43 89 44 · redan@danfoss.com · www.redan.danfoss.dk
© Danfoss | Produced by Danfoss Redan | 2016.12
Pressure
loss *prim.
[kPa]
Flow rate
primary
[l/h]
Flow rate
primary
[l/h]
Pressure
loss *sec.
[kPa]
VL.LZ.F1.02
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