Data Sheet
FHF Floor Heating Manifold
Application
System layout
Manifold with flowmeter
The Manifold FHF is used for controlling water flow
in under floor heating systems. Each tube of the
floor heating system is connected to the manifold,
thus making it possible to control water flow or heat
supply to each room in the building individually.
The manifold consists of a supply and return manifold. The supply manifold includes possibility for
individual shut-off of each circuit and as an option
also flowmeter. The return manifold is equipped
with integrated Danfoss pre-setting valves securing
optimal hydraulic balance in the system.
Manifold without flowmeter
The valves can be controlled electronically by
thermal actuators or act as self-acting units by
means of remote temperature adjusters.
The manifold is supplied in modules of up to 12
outlets. In addition extension pieces are available
for connecting the manifolds in series. Ball valves
are available as an option for positive shut-off
between manifold and system.
The end pieces FHF-EM and FHF-EA are supplied
with manual airvent or alternatively with automatic
airvent, purge valve. The end pieces are placed at
the end of the manifold.
© Danfoss | FEC | 2020.03
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Data Sheet FHF Floor Heating Manifold
Ordering
Description Type Code no.
Manifold set 2+2 FHF-2 088U0502
Manifold set 3+3 FHF-3 088U0503
Manifold set 4+4 FHF-4 088U0504
Manifold set 5+5 FHF-5 088U0505
Manifold set 6+6 FHF-6 088U0506
Manifold set 7+7 FHF-7 088U0507
Manifold set 8+8 FHF-8 088U0508
Manifold set 9+9 FHF-9 088U0509
Manifold set 10+10 FHF-10 088U0510
Manifold set 11+11 FHF-11 088U0511
Manifold set 12+12 FHF-12 088U0512
Manifold set 2+2, with flowmeter FHF-2F 088U0522
Manifold set 3+3, with flowmeter FHF-3F 088U0523
Manifold set 4+4, with flowmeter FHF-4F 088U0524
Manifold set 5+5, with flowmeter FHF-5F 088U0525
Manifold set 6+6, with flowmeter FHF-6F 088U0526
Manifold set 7+7, with flowmeter FHF-7F 088U0527
Manifold set 8+8, with flowmeter FHF-8F 088U0528
Manifold set 9+9, with flowmeter FHF-9F 088U0529
Manifold set 10+10, with flowmeter FHF-10F 088U0530
Manifold set 11+11, with flowmeter FHF-11F 088U0531
Manifold set 12+12, with flowmeter FHF-12F 088U0532
Manifold set 2+2, basic FHF-2B 088U0542
Manifold set 3+3, basic FHF-3B 088U0543
Manifold set 4+4, basic FHF-4B 088U0544
Manifold set 5+5, basic FHF-5B 088U0545
Manifold set 6+6, basic FHF-6B 088U0546
Manifold set 7+7, basic FHF-7B 088U0547
Manifold set 8+8, basic FHF-8B 088U0548
Manifold set 9+9, basic FHF-9B 088U0549
Manifold set 10+10, basic FHF-10B 088U0550
Manifold set 11+11, basic FHF-11B 088U0551
Manifold set 12+12, basic FHF-12B 088U0552
Accessories
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Description Type Code no.
End section – automatic airvent and purge valve FHF-EA 088U0785
End section – manual airvent and purge valve FHF-EM 088U0786
End caps – set FHF-E 088U0582
Connection pieces – set FHF-C 088U0583
Reduction bushes/pieces – set 1" - 3/4" FHF-R 088U0584
Mounting brackets – set FHF-MB 088U0585
2 x ball valve 1” with tail piece – for connection to
manifold and for blocking of floor heating system
1 x thermometer 0 °C to 60 °C, Ø 35 mm –
for flow/return temperature measurement
AI010286478228en-000601 / VDUDO
FHF-BV 088U0822
FHD-T 088U0029
Data Sheet FHF Floor Heating Manifold
Accessories
Compression fittings
Description Type Code no.
Thermal actuator, 24V, NC, Danfoss RA
connection to valve
Thermal actuator, 230V, NC, Danfoss RA
connection to valve
Thermal actuator, 24V, NC, with end switch,
Danfoss RA connection to valve
TWA-A 088H3110
TWA-A 088H3112
TWA-A 088H3114
Stuffing box for manifolds DZR 013G0554
Flowmeter – 088U0819
Manifold insulation – 088U0587
Description Size, mm Code no.
12 × 2 013G4152
13 × 2 013G4153
Compression fittings for PEX tubing in
accordance with ISO 15875.
Max working pressure: 6 bar
Test pressure: 10 bar
Max, flow temperature: 95 °C
G ¾” internal thread
Max, flow temperature given by the tube
manufacturer must not be exceeded.
1)
Compression fittings also suitable for PERT
tubing in accordance with ISO 15875.
14 × 2 013G4154
15 × 2,5 013G4155
16 × 1,5 013G4157
16 × 2 013G4156
16 × 2,2 013G4163
17 × 2 013G4162
18 × 2 013G4158
18 × 2,5 013G4159
20 × 2 013G4160
20 × 2,25 013G4093
20 × 2,5 013G4161
Compression fittings for ALUPEX tubing.
12 × 2 013G4182
14 × 2 013G4184
Max working pressure: 6 bar
Test pressure: 10 bar
Max flow temperature: 95 °C
G ¾” Internal thread
Max flow temperature given by the tube
manufacturer must not be exceeded.
2)
Compression fittings also suitable for PERT/
ALU/PERT tubing.
Compression fittings for STEEL and
COPPER tubing.
Max working pressure: 6 bar
Test pressure: 10 bar
Max flow temperature: 120 °C
G ¾” Internal thread
15 × 2,5 013G4185
16 × 2 013G4186
16 × 2,25 013G4187
18 × 2 013G4188
20 × 2 013G4190
20 × 2,25 013G4093
20 × 2,5 013G4191
10 013G4120
12 013G4122
14 013G4124
15 013G4125
16 013G4126
18 013G4128
1)
1)
2)
2)
© Danfoss | FEC | 2020.03
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Data Sheet FHF Floor Heating Manifold
Capacity/ commissioning
The pre-setting of the manifold valves determines
the flow in the floor heating tubes and is therefore an important factor for obtaining optimal hydraulic balance in the system. A correct hydraulic
balance is important if optimal comfort shall be
achieved with a minimum of energy consumption
and is easily carried out following the example
shown below.
Example
Room 1 1. Determine longest tube/largest room 25 m
2. Desired cooling (ΔT) 5 °C (typical)
3. Determine heat requirement for the room 50 W/m
4. Conversion factor 1,16
5. Calculation of flow for the room
Room 2 6. Determine area for the next room 15 m2
7. Calculation of flow for the room
(ΔT and heat requirement is assumed
identical for the rooms in this case)
Manifold with
flowmeter
Pre-setting:
Q (l/h)
Q (l/h)
2
2
50 W/m2 x 25 m
=
50 W/m2 x 15 m
=
5 °C x 1,16
5 °C x 1,16
2
216 l/h
2
129 l/h
Room 1 -> N
Room 2 -> 5
Manifold without
flowmeter
Pre-setting:
Room 1 -> N
Room 2 -> 6
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Data Sheet FHF Floor Heating Manifold
5
4
3
2
1
0
l/min
Danfoss
88H191.10.10
1
2
3
4
5
6
Pre-setting the
manifold valves
Design
The diagrams shows the capacities for each heating circuit at different pre-settings of the manifold
valves. Please note that the capacities are slightly
different depending on whether a manifold with
flowmeter or a manifold without flowmeter has
Item
Description Material
1 Sightglass Heat resistant plastic
2 Flowmeter nut Brass, CuZn39Pb3
been chosen. Based on the above calculations and
capacity diagrams each manifold valve is pre-set
by rotating the red ring until the correct value on
the ring is in-line with the sight mark on the valve.
Supply manifold
with flowmeter
Item
Supply manifold
without flowmeter
Item
3 Flowmeter insert Brass, CuZn39Pb3
4 Supply manifold body Brass, CuZn40Pb2
5 O-ring EPDM
6 Union for compression fitting Brass, CuZn40Pb2
Description Material
1 Lock washer Brass, CuZn40Pb2
2 O-ring EPDM
3 Valve spindle Brass, CuZn40Pb2
4 O-ring EPDM
5 Valve tube Brass, CuZn40Pb2
6 Supply manifold body Brass, CuZn40Pb2
7 O-ring EPDM
Description Material
1 Gland seal -
2 Pre-setting ring PBT
3 Valve body Brass, CuZn40Pb2
© Danfoss | FEC | 2020.03
Return manifold
with control valve
4 Return manifold body Brass, CuZn40Pb2
5 Kv insert Brass, CuZn39Pb3
6 O-ring EPDM
7 Union for compression fitting Brass, CuZn40Pb2
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Data Sheet FHF Floor Heating Manifold
107
Operation conditions
Dimensions
Max. differential pressure: 0,6 bar.
Max. working pressure: Manifold without flowmeter 10 bar / Manifold with flowmeter 6 bar.
Max. test pressure: Manifold without flowmeter 16 bar / Manifold with flowmeter 10 bar.
Max. flow temperature: 90 °C.
213
386
23
50
78
Type 2+2 3+3 4+4 5+5 6+6 7+7 8+8 9+9 10+10 11+11 12+12
L1 (mm) 111 161 211 261 311 361 411 461 511 561 611
213
386
23
6 | © Danfoss | FEC | 2020.03
50
78
107
Type 2+2 3+3 4+4 5+5 6+6 7+7 8+8 9+9 10+10 11+11 12+12
L1 (mm) 111 161 211 261 311 361 411 461 511 561 611
AI010286478228en-000601 / VDUDO
Dimensions
FHF-EA
FHF-EM
FHF-BV
© Danfoss | FEC | 2020.03
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