Danfoss Termix VVX-I Fact sheet
Fact sheet
Termix VVX-I with complete insulation
District heating substation for direct heating and instantaneous domestic hot water with flow-compensated temperature controller.
Application
The Termix VVX-I is a complete solution for
hot water and space heating with optimal
safety, efficient 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 a differential
pres sure controller, fitting piece and sensor pockets
for insertion of an energy meter as well as strainers.
Heating (HE)
The heating side consists of a plate heat exchanger,
safety valve, manometer, 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, different heat exchangers dimensioned
for central or floor heating will be used.
Domestic hot water (DHW)
The domestic hot water is prepared in the heat
exchanger and the temperature is regulated with a
flow-compensated temperature controller with integrated differential pressure controller. The DH water is cooled very efficiently by the heat exchanger,
thereby creating an excellent operating economy.
The Termix TPV valve ensures a stable hot water
temperature by varying loads, supply temperatures and by high and varying differential pressure
without the need for readjusting the valve. This protects the heat exchanger against overheating and
lime scale formation. Furthermore the Termix TPV
valve has an integrated idle temperature controller, which keeps the house supply line warm. This
shortens the waiting periods during summer when
the heating system is in reduced operation, which
is ideal where high comfort is requested.
Options
The Termix VVX-I can be supplied with a built-in
safety valve mounted in the cold water supply. It
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.
Insulation:
The Termix VVX-I comes complete with a
fully insulated cover thus minimizing the
heat loss both during tapping of domestic
hot water but also when only space
heating is requiered.
FEATURES AND BENEFITS
• Substation for single and multi-family houses
• Indirect heating, DHW temperature regulation with a thermostatic control valve
• Thermostatic or electronic regulation of heating (HE)
temperature
• Capacity : 45 kW heating, 33-55 kW 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 bac teria formation•
• Optimum temperature regulation up to DH supply
temperature 100
•
Low heat loss
°C
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already on order provided that such alterations can be made without subsequential changes being necessary eady agreed.
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CIRCUIT DIAGRAM - EXAMPLES
DHW
21
21
42
63
14 9
14
41 31
Circ.
DCW
DH
supply
DH
return
2c
Technical parameters:
Nominal pressure: PN 10*
DH supply temperature: Tmax = 120°C
DCW static pressure: pmin = 1 bar
Brazing material (HEX): Copper
* PN 16 versions are available on enquiry
Weight incl. cover: 29 kg
(incl. packing)
Insulation: Anthracity grey EPP
1
B
1
7
1
74
1
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)
A Plate heat exchanger HE
B Plate heat exchanger DHW
1 Ball valve
2c Non-return valve
4 Safety valve
7 Thermostatic valve
9 Strainer
10 Circulation pump
14 Sensor pocket, heat meter
18 Thermometer
20 Filling/drain valve
21 To be ordered separately
4 bar
A
48 18
26
4
10
20
18
48
1
38
1
26 Manometer
31 Differential pressure
controller
38 Expansion vessel
41 Fitting piece, energy meter
42 Safety valve/non-return
valve
48 Air escape, manual
63 Sieve
74 IHPT valve
HE
supply
24
9
HE
return
Connections sizes:
All connections: G ¾” (int. thread)
Options:
• Booster pump (increases DH flow)
• Separate mixing circuit
• Safety valve (10 bar)
• Pressure compensation valve (GTU)
• Electronic controller
• Room thermostat
• Connection for circulation
• On/off zone valve
Dimensions (mm):
With insulation (mounted on wall variant):
H 800× W 530 × D 375
DHW: Capacity examples
Substation-
Typ e
VVX-I 1
VVX-I-2
*Heat meter not included
DHW
Capacity
Supply/Re-
kW
32.3 60/19.8 10/45 23 23
40.3 60/20.7 10/45 33 33
36.5 70/19.1 10/50 20 20
32.3 55/21.9 10/45 26 26
32.3 60/19.6 10/45 20 20
39.5 70/19 10/50 20 20
turn flow
Primary °C
55 70/21.5 10/50 39 39
38 55/22.2 10/45 34 34
47 60/19.6 10/45 34 34
59 70 10/50 34 34
DHW °C
DH W Tap
load l/h
Pressure
loss Primary
kPa*
Heating: Capacity examples
Substation-
Typ e
VVX-I x-1
VVX-I x-2
VVX-I x-3
Heating
Capacity
Supply/
Return
flow pri-
kW
mary °C
12 70/40 60/35 353 30 418 31
24 90/45 70/40 470 45 699 19
19 70/40 60/35 553 30 662 52
35 90/45 70/40 674 45 1019 30
31 70/40 60/35 906 30 1080 41
50 90/45 70/40 956 45 1455 25
Heating
Circuit
°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
Flow
rate
primary
l/h
dp min
kPa
Flow
rate sec-
ondary
l/h
Residual
pump
head
kPa
© Danfoss | DHS-SRMT/ PL | 2016. 12
VL.HE.M2.02
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