Data sheet
ThermoDual®- FLS-COMBI
General description/
Application
Maximum operating
parameters
Domestic hot water provision by instantaneous heater
is an efficient and hygienic optimal solution. Hot water
is not stored and will be produced only on request. Thus,
low temperatures in drinking water can be reduced to
a necessary minimum.
Habitats for bacteria,such as legionella are virtually nonexistent. If the conditions for connection of thes e systems
are given (sufficiently high capacity o n heating side to cover
peak load) or buffer tanks is present, th ese systems can be
used unrestric ted. Significant advanta ges of the system are:
• no storage of drinking water
• efficient cooling of the primary media
• optimum use of energy
• independent choice of different energy sources
• at any time sufficiently high domestic hot water
temperature, that fulfils all hygienic requirements
• low space requirement
• lime scale is largely avoided
Primary
Maximum permissible supply temperature, primary 90°C
Maximum permissible operating pressure, primary 10 bar(g)
Rated pressure, primary PN10
Secondary
Maximum permissible temperature, secondary 90°C
Maximum permissible operating pressure, secondary 10 bar(g)
Minimum required pressure (static), water supply 1,0 bar(g)
Rated pressure, secondary PN10
Mains power supply / maximum power consumption 230V AC / 4,0 A
Materials
Code numbers
© Danfoss | 2019.02
Pipes, fittings, flanges, valves (domestic side)
ditto (heating side) P235GH-TC1, CuSn5Pb5Zn5-C (RG-5), ST37.0
Heat exchanger 1.4404 with Cu solder
Insulation Hardcover EPP λ=0.036 W/mK (100%ENEV)
Capacity
[kW]
70 00 4X1538
130 00 4X1539
175 00 4X154 0
245 00 4X1541
Code no.
Pump control
(PWM control signal)
1.4571, bronze or brass as per DIN EN 1982,
also considering DIN 50930-06 and UBA guidelines
Note:
Version without own electronic controller and
terminal block for devices on request.
VD.LZ.H2.02 | 1
Data sheet ThermoDual®- FLS-COMBI
Circuit diagram
Technical data
HEL Heat exchanger
HPU Heating pump
CPU Circulation pump
SFV Safety valve
ECD Electronic domestic hot water controller (ECL310 / P318.10)
1 Domestic water (cold)
2 Domestic hot water (hot network)
3 Circulation (inlet)
4 Heating supply
5 Heating return
TC Sensors (general: direc t , immersion, surface)
“S2”: with designation as for controller
Pump
dpr
[kPa]
FR
DW
(10 ->60 °C)
[m3/h]
DW
dp
[kPa]
FR
C
(55 ->60°C )
[m3/h]
C
dpr*
[kPa]
Typ
ThermoDual®
Capacity
[kW]
Shut-off valve
Non-return valve
Check valve
F1: Flow sensor
p
FR
(70 ->25° C)
[m3/h]
FLS-COMBI 70 70 1,34 55 1,2 15 1,0 20
FL S - COMBI 130 130 2,5 35 2,23 25 1, 5 35
FL S- COM BI 175 175 3,35 25 3,0 24 2,0 25
FLS-COMBI 245 245 4,47 55 4,20 38 2,0 .. 3,0 60 .. 32
FR: Flow rate p: primary dpr: Remaining pump head dp: Pressure loss DW: Domestic water C: Circulation * (maximal possible)
2 | © Danfoss | 2019.02
VD.LZ.H2.02
Data sheet ThermoDual®- FLS-COMBI
Function Flow systems provide heated domestic water when requested. By a heat exchanger (HEL), the cold
water flowing into connection (1) will be heated up to set point and provided to the consumer at the
connection (2). The electronic controller (ECD) is measuring the relevant temperatures and controls
the target values that are held constant in all operating conditions. This is i.e. achieved by influencing
the speed of the heating pump (HPU), so that the outlet temperature always matches the specified
value. Short-term peaks in consumption are registered at the flow sensor to intervene quickly and
avoid large temperature fluctuations. The cooled- circulation water from the network (connection 3)
is constantly heated in heat exchanger (HEL), even in times of draw-off , reheated and the temperature
control (sensor) in the amount of the controlled circulation pump (CPU) influenced so that only the
necessary amount flows to maintain constant power set point.
The capacity for the peak load is to ensure either by buffering heating water in a tank (BTA) or there
must be a sufficiently large connection value available. The Recharging of a buffer (e.g. from a boiler)
can a requisition (sensor / switch contact) on controller (ECD) using an on-site charging pump (LPU).
The operation of the system by a controlled heating pump (HPU) is only possible without differential
pressure between the connections (4) and (5).
Dimensions
Typ e
ThermoDual®
FLS-COMBI 70 1" I 1" I 1 ¼” 90 90 70 31
FL S - COMBI 130 1" I 1" I 1 ¼” 90 90 70 34
FL S- COM BI 175 1 ¼" I 1" I 1 ¼” 105 90 96 36
FLS-Combi 245
DW C/H Circ.
1/2
G ISO
1 ¼" I 1" I 1 ¼” 105 90 96 40
Connections
3
G ISO
HTG (DN)
SL, RL
4/5 PN10
Rp
H1
[mm]
H2
[mm]
H3
[mm]
Weight [ kg]
Pump
control
(PWM)
4
2
876
H2
115 155 155 275
700
521
275
H3
298
H1
VD.LZ.H2.02
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© Danfoss | 2019.02 | 3
Datenblatt ThermoDual®- FLS -COMBI
Accessories Heating buffer storage tank, standing model,
Charging-/Discharging Connections as flange
Pipe set for simple connection between system
and buffer
connection Type: PSS
System Buffer Pipe set Dimensions
Typ e Code Ty pe Volume [l] Code Typ e Code H1 [mm] H2 [mm] H3 [mm] L [mm]
FLS-Combi 70 00 4X1538 PSS 300 300 640U4984 FLS 70 + PSS 300 146 B2450 1450 265 1923 1515
FLS-Combi 70 00 4X1538 PSS 500 500 640U4985 FLS 70/130 + PSS 500 14 6B2451 1860 325 2024 1625
FLS-Combi 130 00 4X1539 PSS 500 500 640U4985 FLS 70/130 + PSS 500 146B2451 1860 325 2024 1625
FLS-Combi 130 00 4X1539 PSS 750 750 640U4986 FLS 130 + PSS 750 146B2452 1870 325 2024 1775
FLS-Combi 175 00 4X154 0 PSS 750 750 640U4986 FLS 175/245 + PSS 750 146 B2453 1870 325 2063 1775
FLS-Combi 175 00 4X154 0 PSS 1000 1000 640U4987 FLS 175/245 + PSS 1000
FLS-Combi 245 00 4X1541 PSS 750 750 640U4986 FLS 175/245 + PSS 750 14 6B2453 1870 325 2063 1775
FLS-Combi 245 00 4X1541 PSS 1000 1000 640U4987 FLS 175/245 + PSS 1000
146 B2454
146 B2454
1910 345 2095 1892
1910 345 2095 1892
L
H2
200
H3
1618
742
H1
4 | © Danfoss | DHS-SDDT / P L | 2019.02
VD.LZ.H2.02
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