Data Sheet
Premounted Midi Shunt
Application
Midi Shunt 088U0851
- with one circuit
The Danfoss Midi shunts are used for control of flow
and supply temperature in hydronic floor heating
systems. The compact, midi shunt comes premounted for 1-circuit ready to mount on the wall
and fittings for pipe connection (20 × 2 mm).
The shunts self-acting proportional thermostatic
control valve is used to control the supply
temperature.
The thermostatic sensor ensures that the desired
supply temperature to the underfloor heating
system always remains constant.
Other components in the Danfoss Midi shunt:
• Built-in check valve ensures correct flow direction.
• An air-vent on top and a thermometer for trouble
shooting and service.
• RA-N valve with pre-setting to ensure the optimal hydronic balance in the system.
• UPM3 Auto pump ensures that the energy consumption for the system is kept at a minimum.
• Danfoss Icon™ Dial 230V thermostat for accurate
room control.
Features:
• Compact design — fits in even the smallest places.
• Pre-mounted — minimal risk of installation faults.
• Easy ordering — only one number necessary.
• Short installation time.
• Grundfos UPM3 Auto pump ensures the lowest
possible operating costs.
Should water treatment be used it is essential that
dosing instructions of the manufacturer are strictly
observed. It is recommended that formulations
containing mineral oil are avoided.
Ordering
© Danfoss | FEC | 2020.06
Midi Shunt version For room size Code no.
1 circuit mixing shunt with UPM3 AUTO 15-70 circulation pump
and built in Danfoss Icon™ Dial room thermostat.
up to 20 m
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2
088U0851
Data Sheet Premounted Midi Shunt
Accessories
Description Code number
Grundfos UPM3 Auto pump 088U0860
TWA-A 230V, NC 088H3112
RA-N DN15 Valve 013G 0013
Danfoss Icon™, Dial thermostat 088U1005
FTC self-acting sensor 013G5081
Insulation capsule for UPM3 pump 088U0075
Technical specifications
Supply voltage 230 V AC, 50 Hz
Enclosure, Midi shunt IP 21
Thermostat ON/OFF with thermal accelerator
Temperature limitation, Thermostat 5 °C to 30 °C
Enclosure, Thermostat IP 21
Frost protection Setting 5 °C
Running power consumption, TWA 2 W
Cable length, TWA 950 mm
Ambient temperature 0 °C to 60 °C
FTC sensor temperature range 15 °C to 50 °C
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Data Sheet Premounted Midi Shunt
TWA
Thermal Actuator
TWA is a small actuator for electrical on/off-control
to activate valves.
TWA is equipped with a visual position indicator
to show the open or closed position of the valve.
For Midi Shunts is used the TWA-A 230 V NC
(Normally Closed) version.
Code no. 088H 3112
Supply voltage 230 V
Max. inrush current 350 mA
Frequency 50-60 Hz
Running power consumption 2 W
Spindle travel time ~3 min.
Ambient temperature 0 °C to 60 °C
Enclosure IP 41
Cable length 950 mm
For further technical information, see specific TWA actuator data sheet.
RA-N Valve
Midi Shunt 088U0851 has one heating circuit and
is equipped with a Danfoss RA-N pre-setting valve
securing optimal hydronic balance in the system.
The valve is controlled electronically by TWA
thermal actuator.
Product Code no.
RA-N 15 valve 013G 0013
RA-N DN15 Valve –
Pre-setting table
Connections Pre-setting
Typ e
RA-N 15 1/2 1/2 0,04 0,09 0,16 0,25 0,36 0,43 0,52 0,73 0,90
1)
The kv-value indicate s the water flow (Q) in m3/h at a pressure dro p (∆p) across the valve of 1 bar;
Kv = Q: √∆p At setting N the kv-value is stated accordi ng to EN 215, at Xp = 2K i.e. the valve is close d at 2 °C higher room tempera ture. At lower settings the Xp value is reduced to 0, 5K of
the setting val ue. The kvs-value states the flo w Q at a maximum lift, i.e. a t fully open valve at setti ng N.
See specific data sheets RA-N pre-setting valves for further technical information.
Inlet Outlet kv-max.1)(m3/h at ∆p = 1 bar) k
Rp R 1 2 3 4 5 6 7 N N
vs
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Data Sheet Premounted Midi Shunt
Danfoss Icon™ Dial, 230 V
on-wall version
Danfoss Icon™ is a range of flush and surface
mounted room thermostats for hydronic floor
heating applications.
Danfoss Icon™ Dial is mains powered and can
be used as a stand-alone thermostat or in combination with wiring center 088H0016.
The thermostat uses a relay output and can control
up to 5 thermal actuators.
The user can set the desired room temperature
with the dial, in a range from 5 °C to 30 °C.
The dial can be removed, allowing limitation pins
to be used to limit the setpoint range.
Features
• ON/OFF control
• Inwall version compatible with a wide range
of 3rd party wall frames
• Range limitation via pins
• Neutral design and simple user interface
• Frost protection setting
• Can be used with 230 V NC or NO actuators
• Includes thermal accelerator
• Very high UV-resistance
Technical specifications
Typ e Dial
Temperature setting range 5 °C to 30 °C (frost protection setting = 5 °C)
Ambient temperature, storage –20 °C to +60 °C
Ambient temperature, used in application 0 to 40 °C
Controller, type On/Off with thermal accelerator
Max. continuous load (output) < 50 mA / 10 W (= 5 pcs. Danfoss TWA actuators)
Max. inrush current (actuator) 3 A ≤ 100 ms
Power consumption 0,4 W
Power supply (excl. actuators) 220–240 V, 50/60 Hz
Sensor, room 47 kΩ, NTC
Shell material
IP and Protection class
ErP class
Colour White RAL9010 / Dark Grey RAL7024
Dimensions, on-wall version 86 × 86 × 25 mm
White parts: PC ASA
Grey parts: PC, 10% glass
IP: 21
Protection class: II
(1%)
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Data Sheet Premounted Midi Shunt
FTC
Temperature controller
System
FTC is a self-acting thermostatic sensor used for
flow temperature control of floor heating.
The water temperature is measured by a surface
sensor. The snap-lock connector of the sensor
element secures a firm connection to the valve.
Features:
• Closes on rising sensor temperature
• Temperature range: 15 °C to 50 °C
Product Type Code no.
Thermometer controller (15 °C to 50 °C) FTC 013G5081
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Dimensions
290 mm
60
420 mm
380 mm
Depth: 100 mm
Midi Shunt 088U0851
75
25
Danfoss Icon™ Dial 088U1005
86
86
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AI303646884319en-000201
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