Danfoss FHR, FHR-B Data sheet

Data Sheet

FHR/FHR-B Floor Heating Manifold

Application

The FHR/FHR-B Manifold 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 in the building
individually.

The manifold consists of a supply and return man­ifold. The manifold is supplied in modules of 2 to 8
outlets. The end pieces are placed at the end of the
manifold.

Two types in this series are provided:

Typ e FHR. The supply manifold includes possibility
for individual shut-off of each circuit. The return
manifold is equipped with integrated pre-setting
valves securing optimal hydraulic balance in the
system. The valves can be controlled electronically
by thermal actuators with RA connection.

Typ e FHR-B. The supply and return mani fold include
shut off function for each loop.

FHR type

FHR-B type

System Layout

© Danfoss | FEC | 2020.11

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Data Sheet FHR/FHR-B Floor Heating Manifold

088U0925.BR.01.01

Ordering

Accessories

Description Typ e Code no.

Manifold set 2+2 FHR 2 088U0882
Manifold set 3+3 FHR 3 088U0883
Manifold set 4+4 FHR 4 088U0884

Manifold set 5+5 FHR 5 088U0885

Manifold set 6+6 FHR 6 088U0886

Manifold set 7+7 FHR 7 088U0887

Manifold set 8+8 FHR 8 088U0888
Manifold set 2+2 FHR-B 2 088U0872
Manifold set 3+3 FHR-B 3 088U0873
Manifold set 4+4 FHR-B 4 088U0874
Manifold set 5+5 FHR-B 5 088U0875
Manifold set 6+6 FHR-B 6 088U0876
Manifold set 7+7 FHR-B 7 088U0877
Manifold set 8+8 FHR-B 8 088U0878

Description Typ e Code no.

End section — automatic airvent and purge valve FHRRPO-EA 088U0920

End section — manual airvent and purge valve FHPRO-EM 088U0921

Compression Fittings

By-pass section — automatic air vent, purge valve and
by-pass valve

FHPRO-ED 088U0922

Mixing Shunt connector — one set FHPRO-SC 088U0923

End section — Air vent end without drain FHPRO-MEEM 088U0924

Mounting brackets — set FHPRO-MB 088U0925

Description Type, mm Code no.

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

Compression fittings for ALUPEX tubing.

• Max working pressure: 6 bar

• Test pressure: 10 bar

• Max. flow temperature: 95 °C

• G ¾” internal thread

Compression fittings for STEEL and COPPER tubing

• Max working pressure: 6 bar

• Test pressure: 10 bar

16 × 2 013G4156

20 × 2 013G4160

20 × 2,25 013G4093

20 × 2,5 013G4161

16 × 2 013G4186

20 × 2 013G4190

20 × 2,25 013G4093

20 × 2,5 013G4191

16 013G4126

18 013G4128

• Max. flow temperature: 95 °C

• G ¾” internal thread

2 | © Danfoss | FEC | 2020.11

Note: Max flow temperature given by the tube manufacturer must not be exceeded.

AI361466798708en-000101

Data Sheet FHR/FHR-B Floor Heating Manifold

Presetting.03.00

Capacity / commissioning

Capacity

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) 10 °C (typical)

3. Determine heat requirement for the room 150 W/m

4. Conversion factor 1,16

5. Calculation of flow for the room

Q (l/h) =

150 W/m2 x 25 m

10 °C x 1,16

2

= 323 l/h

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

Q (l/h) =

in this case)

1

1 2 3 4 5 6 7 N

150 W/m2 x 15 m

10 °C x 1,16

2

= 193 l/ h

0,8
0,6

0,5
0,4

0,3

2

2

Presetting the manifolds

0,2

∆P

[bar]

0,1

0,08
0,06

0,05
0,04

0,03

0,02

0,01

10 20 30 50 70 100

Q [l/h]

The diagram shows the capacities for each heating
circuit at different pre-settings of the manifold
valves.

200 300 500 700 1000 2000

3000

Based on above calculations the and capacity dia­grams each manifold is pre-set by rotating the red
ring until correct value on the ring is in-line with
the sight mark on the valve

© Danfoss | FEC | 2020.11

Presetting.01.00

1. Presetting range

2. Factory setting and one-pipe system

3. Reference mark

Presetting.02.00

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Data Sheet FHR/FHR-B Floor Heating Manifold

Capacity

FHR

Presetting 1 2 3 4 5 6 7 N

Kv (m3/h) 0,28 0,34 0,40 0,48 0,57 0,67 0,82 1,00

1

1 2 3 4 5 6 7 N

0,8
0,6

0,5
0,4

0,3

0,2

∆P

[bar]

0,1

0,08
0,06

0,05
0,04

0,03

0,02

0,01

10 20 30 50 70 100

200 300 500 700 1000

Q [l/h]

FHR-B

Number of turns 0,5 1 1,5 2 2,5 3 3,5 4 4,5
Kv (m3/h) 0,16 0,42 0,61 0,79 0,91 0,99 1,20 1,37 1,48

1½

2½ 3½½

1

1 2 3 4

0,8
0,6

0,5
0,4

0,3

0,2

∆P

[bar]

0,1

0,08
0,06

0,05
0,04

0,03

0,02

0,01

10 20 30 50 70 100

200 300 500 700 1000 2000

3000

Q [l/h]

Operation Conditions

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Max. differential pressure .................0,6 bar

Max. working pressure ...................10 bar

Max. test pressure ........................16 bar

Max. flow temperature ...................90 °C

AI361466798708en-000101

Data Sheet FHR/FHR-B Floor Heating Manifold

Capacity

G1” - ISO228/1

G3/4” - ISO228/1

315

211

G1” - ISO228/1

50

G3/4” - ISO228/1

L1

68

86,7

Typ e 2+2 3+3 4+4 5+5 6+6 7+7 8+8
L1 (m m) 164 214 264 314 364 414 464

G1” - ISO228/1

35

G3/4” - ISO228/1

348

211

G1” - ISO228/1

50

G3/4” - ISO228/1

L1

68

87

Typ e 2+2 3+3 4+4 5+5 6+6 7+7 8+8
L1 (m m) 174 224 274 324 374 424 474

35

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Dimensions

G1” - ISO228/1

G1” - ISO228/1

G3/4” - ISO228/1

211

35

294

50

G3/4” - ISO228/1

L1

68

87

Typ e 2+2 3+3 4+4 5+5 6+6 7+7 8+8

L1 (m m) 143 193 243 293 343 393 443

57

35,5 63

37

57

31,535,5

088U0920.d.01.01

37

088U0921.d.01.01

6 | © Danfoss | FEC | 2020.11

AI361466798708en-000101