Data Sheet
Horizontal Distribution Unit - HDU Single-port
Application
Technical Data
Danfoss pre-fabricated HDU distribution units are
made for distribution and measuring of waterbased heating in 2-pipe horizontal systems.
A HDU is easily mounted on the apartment wall
and connected to the riser. The radiators in the
apartment are connected through the manifold.
The unit design provides a good overview of the
installation, which makes after-service easy.
All Danfoss distribution units are equipped with:
heat meter, for individual measuring of en-
▪
ergy consumption.
dP controller, to ensure hydraulic stability in
▪
the heating system.
The HDU single-port unit is wall-mounted and
created for serial radiator distribution. HDU single-port units come in two versions, with left or
right connection.
Max. temperature 90 °C
Max. working pressure in heating system piping before the unit 2 bar
Normal required differential pressure over unit (HDU-SF) 0.26 bar*
Max. differential pressure in a control loop 0.22 bar
Max. static pressure 10 bar (PN10)
Connection to riser (in and out) R ¾"
Connection to manifold (out) ¾"
Power supply (Heat Meter) A-cell battery, 3.6 VDC
HDU Single-port
- with left connection
*At differential pressure in control loop 10 kPa at
100% AB-PM setting.
Danfoss Heating Solutions VDIGA102 © Danfoss 08/2012 1
Data Sheet Horizontal Distribution Unit - HDU Single-port
Installation Example
HDU single-port system
Ordering
HDU-SF Connection Code no.
Horizontal Distribution Unit Single Flat - HDU-SF single-port right 003L1241
Horizontal Distribution Unit Single Flat - HDU-SF single-port left 003L1242
Accessories and Spare Parts Code no.
Manifold port plug (10 pcs.) 003L1246
Capillary tube for AB-PM 003L8152
Filter for strainer 065B8248
Modules for Heat Meter Code no.
M-Bus module 087G6027
Communication
Function
Compression Fittings Data Size Code no.
For PEX tubing
(in accordance with ISO 15875)
For ALUPEX tubing
For steel and copper tubing
Note! Max. flow temperature given by the tube manufacturer must not be exceeded.
L-Bus module (use for external radio) 087G6035
RS232 module 087G6029
RS485 module 087G6032
Analogue output module (4 - 20 mA) 087G6034
Combined module (2 pulse inputs / 1 pulse output) 087G6041
Pulse input module (2 inputs) 087G6037
Pulse output module (2 outputs) 087G6039
16 x 2 mm 013G4156
PN6
G ¾” internal thread
PN10
G ¾” internal thread
PN10
G ¾” internal thread
20 x 2 mm 013G4160
20 x 2.25 mm 013G4093
20 x 2.5 mm 013G4161
16 x 2 mm 013G4186
20 x 2 mm 013G4190
20 x 2.25 mm 013G4093
20 x 2.5 mm 013G4191
16 mm 013G4126
18 mm 013G4128
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Data Sheet Horizontal Distribution Unit - HDU Single-port
Design
Materials in Contact with
Water
1. Ball valve for in- and outlet connection to the riser.
2. Strainer to trap dirt, sand etc. from pipe water (re-
placement filter available as accessory).
3. AB-PM automatic balancing valve, combines three
functions: differential pressure controller, control
valve with linear characteristic and flow limiter.
4. Manifold for radiator connection, flow.
5. Manifold for radiator connection, return.
6. Automatic air vent and drainage (both inlet and
outlet has drainage and air vent possibilities).
7. Heat Meter for energy measuring, with 8-digit LCD.
8. Cabinet (with lockable door).
Shut- off valves Body, tailpiece, ball Brass
Seals PTFE
O-ring EPDM
Strainer Body Brass
Filter Stainless steel
O-ring EPDM
AB-PM valve Body, cone (CV), seat (CV) Brass
Membrane, O-ring, seat (PC) EPDM
Spring, cone (PC), screw Stainless steel
Flat gasket NBR
Sealing agent Dimethacrylate Ester
Capillary tube Copper
& 5 Manifold Inlet adapter, shutter, manifold
pipe, Euro cone connector
O-rings EPDM
Air vent & drainage Body Brass
Seals EPDM
Heat Meter Body of flow meter Brass
Temperature sensors, reflectors Stainless steel
Measuring tube qp 0.6 - 2.5 --> PES
Other parts Assembly nipples Brass
Flat gaskets Aramide fibres, NBR
Brass
qp 3.5 - 60 --> PEEK-GF or PPS-GF
Danfoss Heating Solutions VDIGA102 © Danfoss 08/2012 3
ΔP_a
ΔP_v
Q [l/h]
ΔP_loopΔP_a ≥ ΔP_v + ΔP_loop
100%
90%
80%
70%
60%
50%
40%
30%
20%
5 6 7
8 9 10
11 12 13 14 15 16 17 18
450
400
350
300
250
200
150
100
50
0
Data Sheet Horizontal Distribution Unit - HDU Single-port
Settings
Q = Needed design flow for the loop.
Δ P_loop = Needed design Δ P for the loop.
Δ P_a = available Δ P.
Δ P_V = min needed Δ P for AB-PM (starting Δ PV) = 16 kPa
Flow l/h
Δ P_loop [kPa]
Flow [l/h] - average
Δ P_loop
[kPa]
5 139 192 253 289 327 351 376 395 410
6 134 185 244 278 315 337 360 381 399
7 130 177 235 267 303 323 344 366 387
8 125 170 226 256 290 309 329 351 374
9 120 162 216 244 277 294 313 335 360
10 115 155 207 233 264 280 297 319 345
11 110 147 197 221 251 265 281 302 328
12 104 140 187 209 237 250 264 285 311
13 99 132 177 197 223 235 248 268 292
14 93 124 166 185 209 220 232 250 273
15 87 116 156 173 195 204 215 232 252
16 81 108 145 160 180 188 198 213 230
17 75 100 134 148 165 173 182 194 207
18 68 92 123 135 150 157 165 174 183
19 62 84 112 122 134 141 148 154 158
20 55 76 101 109 119 124 131 133 132
20% 30% 40% 50% 60% 70% 80% 90% 100%
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Data Sheet Horizontal Distribution Unit - HDU Single-port
Example Given:
Design flow trough radiatorsloop: 300 l/h
Pressure drop trough the loop at design flow: 10 kPa
Solution:
Set to 70 %, AB-PM will control differential pressure of 10 kPa when design flow is achieved. It will at any loads including keep it under 22 kPa at zero load, while limiting the
flow to radiator system to 300 l/h.
AB-PM Automatic Balancing Valve
AB-PM is a combined automatic balancing valve. It
features three functions in a compact valve body:
1. Differential pressure controller.
2. Control valve with linear characteristic.
3. Flow limiter.
Benefits:
Reliable heating system resulting in proper
▪
heat distribution even at partial loads and
noise free operation based on stable low Δp
over thermostatic radiator valves even in installation where higher pump head is needed.
Lower heating cost.
▪
Better indoor temperature control • Faster in
▪
simpler installation with less installation space
needed.
Technical data
Nominal diameter DN20
Control valves characteristic Linear
Shut-off leakage rate Acc. to ISO 5208 class A - no visible leakage
CV stroke 2.25 mm
Connection
Ext. thread ISO 228/1 G 1 A
Actuator M 30 x 1.5
Design
1. Spindle.
2. Stuffing box.
3. Pointer.
4. Control valve’s cone.
5. Membrane.
6. Main spring.
7. Hollow cone (pressure controller).
8. Vulcanized seat (pressure controller).
9. Impulse tube.
AB-PM is a combined automatic balancing valve. It is working as Δp controller, flow limiter and zone
controller. Higher pressure acts on the upper side of the control diaphragm (5) while via an impulse
tube (9) lower pressure in the return pipe acts on the lower side of the diaphragm. When available
pressure increases at partial loads, the membrane closes and thus keeps stable Δp inside the controlled loop. Δp controller keeps constant differential pressure on the controlled loop including the control part of AB-PM (similar as if ASV-I would be integrated into ASV-P).
Danfoss Heating Solutions VDIGA102 © Danfoss 08/2012 5
The control part of AB-PM is working as a flow limiter. This enables to set both the design flow as well
as needed Δp. The flow rate is defined by presetting AB-PM, based on pressure demand of the loop.
With actuator mounted on the valve, AB-PM can be used as zone valve. When connected to the room
controller with time programs, functions such as night setback, holiday mode, etc become available.
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