Danfoss VMTD-MIX-I Fact sheet
Fact sheet
Termix VMTD-MIX-I
District heating substation for direct heating and instantaneous domestic hot water with thermostatic and flow - compensated control.
Application
The Termix VMTD-MIX-I is a complete solution
with built-in water heater and a differential pressure controlled heating system with differential
pressure control and mixing loop. The Termix
VMTD MIX - I is applicable for sin gle - family houses and for decentralized systems in multi - family
houses.
District heating (DH)
The substation is prefabricated with a differential
pressure controller, fitting pie ce and sensor pockets for insertion of a heat meter 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 controller sets
the optimum operation conditions for radiator
thermostats in order to enable individual temperature control in each room. The mixing loop
creates a suitable temperature level e.g. for floor
heating. In order to enable a time-dependenttemperature control program, a zonevalve with
actuator and a room thermostat can be included
as an option.
Domesti c hot water (DHW)
The domestic hot water is prepared in the heat
exchanger and the temperature is regulated
with a thermostatic and flow compensated
controller with integrated differential pressure
controller. The heat exchanger cools the DH
water very efficiently, thereby creating an excellent operating economy. The Danfoss IHPT
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 protectsthe heat exchanger against overheating
and lime scale formation. Furthermore the
IHPT valve has an integrated idletemperature
controller, which keepsthe house supply line
warm. This shortensthe waiting periods during
summer when the heating system is in reduced
operation, which is ideal where highcomfort is
requested.
Options
The substation can be supplied with a built-in
non - return valve and safetyvalve 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 MIX - I can be delivered with
white - lacquered steel cover in mod ern design
FEATURES AND BENEFITS
• Substation for DH and
decentralized systems
• Direct heating with differential
pressure controller
• DHW thermostatic and flow
compensated temperature controller
• Capacity: 33 – 59 kW for DHW
• DHW in suff icient 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
• Low heat loss
www.danfoss.com
CIRCUIT DIAGRAM - EXAMPLE
DHW
39
Circ.
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: 25 kg
(incl. packing)
Insulation: EPP λ 0.039
Cover: White - lacquere d
steel sheet
Dimensions (mm):
Without cover: H 550 × W 530 × D 280
With cover: H 550 × W 540 × D 360
63
9
14
14
41
= 120 °C
max
= 1,0 bar
min
1
31
B Heat exchanger DHW
1
B
74
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) return
8. Heating (HE) supply
1 Ball valve
2 Non-return valve
7 Thermostatic valve
9 Strainer
10 Circulator pump
14 Sensor pocket, heat meter
39
39
18
10
2
7
Connections sizes:
DH + FH + HE: G ¾“ (int. thread)
DCW + DHW: G ¾“ (int. thread)
Options:
• Booster pump (increases DH flow)
• White - lacquered steel cover
• Safety valve and non - return valve (10 bar)
• Pressure equalizer GTU
• Room thermostat
• Zone valve with actuator
• Air screw (DH supply)
wall
18 Thermometer
31 Differential pressure
controller
39 Connection closed
41 Fitting piece, heat meter
63 Sieve
74 IHPT
HE
Supply
HE
Return
HE
Supply
FH
Return
DHW: CAPACITY EXAMPLES
Substation type
VMTD MIX - I -1
VMTD MIX - I - 2
DHW capacity
[ kW ]
32,3 60 19,8 10 / 45 23 798
40,3 60 20,7 10 / 45 33 996
36,5 70 19,1 10 / 50 20 792
55 70 21,5 10 / 50 39 1190
32,3 55 21,9 10 / 45 26 798
38 55 20,0 10 / 45 30 939
39 60 19,6 10 / 45 20 798
47 60 19,6 10 / 45 34 1161
39,5 70 16,0 10 / 50 20 858
59 70 19,2 10 / 50 34 1276
Supply flow
primary
[ °C ]
Return flow
primary
[ °C ]
DHW
[ °C ]
Pressure loss
primary
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 . 05
[ kPa ]
DHW tap load
[ l / h ]
VL.EH.C4.02
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