Danfoss HDU-SF Installation guide
Installation Guide
HDU-SF (Horizontal Distribution Units - Single Flat)
1 Introduction
HDU-SF single-port HDU-SF multi-port
1. Ball valve for in- and outlet connection to the riser.
2. Strainer to trap dirt, sand etc. from pipe water (replacement 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.
Note!
The HDU-SF must only be installed in a dry and frost-free environment.
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Operation of the HDU-SF outside the specified operating and environmental conditions is not permitted.
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Joints may be loose after transportation. Please check and re-tighten, if necessary.
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HDU-SF are available with left or right side connections to riser. All illustrations are shown for the left side version.
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Service guide is placed on the inside of the cabinet door.
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2 Technical Data
Max. temperature 90 °C
Max. working pressure in heating system piping before the unit 2 bar
Nominal 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 (PN 10)
Connection to riser (in and out) R 3/4"
Connection to manifold (out) 3/4"
Power supply (Heat Meter) A-cell battery, 3.6 VDC
* At differential pressure in control loop 10kPa at 100% AB-PM setting.
Danfoss Heating Solutions VIIGA102
1
260
380
51
49
2389
72
25
95
125
480
380
62
95
51
49
23
213
113 200
266
50
25
125
B
A
Installation Guide HDU-SF (Horizontal Distribution Units - Single Flat)
3 Mounting on Wall
HDU-SF single-port HDU-SF multi-port
HDU-SF 4-port
A = 480 mm
HDU-SF 7-port
A = 630 mm
The HDU-SF is mounted vertically, tilted angle is to be checked with a spirit level. Available for wall or recess mounting, depth can be
regulated by moving the face frame. The cabinet has four holes in the back plate, intended for mounting with the supplied screws and
rawlplugs.
4 Connections
4.1 Connection to riser
Connect the HDU-SF to the riser according to flow direction:
1. Riser inlet
2. Riser outlet
3. The connections are size DN20 with internal thread. Remember backstop to prevent the ball valves from loosening.
HDU-SF single-port
HDU-SF multi-port
2
VIIGA102 Danfoss Heating Solutions
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