Type RN

For the precise control of constant volume flow rates

Circular self-powered volume flow controllers for the control of supply air or extract air in constant air volume systems

  • Volume flow rate can be set using an external scale, no tools required
  • High control accuracy
  • No on-site test measurements required for commissioning
  • Suitable for airflow velocities of up to 12 m/s
  • Any installation orientation; maintenance-free
  • Casing air leakage to EN 1751, class C


Optional equipment and accessories

  • Acoustic cladding for the reduction of case-radiated noise
  • Secondary silencer Type CA, CS or CF for the reduction of air-regenerated noise
  • Hot water heat exchanger Type WL and electric air heater Type EL for reheating the airflow
  • Actuator for switching between setpoint values

CAV controller variant RN 00137512_0


  • Application
  • Description

Application

  • Circular CONSTANTFLOW CAV controllers of Type RN for the precise supply air or extract air flow control in constant air volume systems
  • Mechanical self-powered volume flow control without external power supply
  • Simplified project handling with orders based on nominal size
  • Volume flow rate setpoint can be set on external scale
  • Switching between Vmin and Vmax using optional actuator

Special features

  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation

Nominal sizes

  • RN-S: 80, 100, 125
  • RN: 80, 100, 125, 160, 200, 250, 315, 400
  • RN-FL: 100, 125, 160, 200, 250, 315, 400

Variants

  • RN-S: Compact-height volume flow controller
  • RN: Volume flow controller
  • RN-D: Volume flow controller with acoustic cladding
  • RN-FL: Volume flow controller with flanges on both ends
  • RN-D-FL: Volume flow controller with acoustic cladding and flanges on both ends
  • Units with acoustic cladding and/or a secondary silencer Type CA, CS or CF for demanding acoustic requirements
  • Acoustic cladding cannot be retrofitted

Construction

  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)
  • A2: Stainless steel

Parts and characteristics

  • Ready-to-commission controller
  • Damper blade with low-friction bearings
  • Bellows that acts as an oscillation damper
  • Cam plate with leaf spring
  • Scale with pointer to set the volume flow rate setpoint
  • Aerodynamic function testing of each unit on a special test rig prior to shipping
  • Correct operation even under unfavourable upstream conditions (1.5 D straight section required upstream)

Attachments

  • Min/Max actuators: Actuators for switching between minimum and maximum volume flow rate setpoint values
  • Modulating actuators: Actuators for the stepless adjustment of volume flow rates or to switch between minimum and maximum volume flow rate setpoint values
  • Retrofit kits: Actuators and installation accessories
  • Variant RN-S cannot be combined with an actuator

Accessories

  • Lip seals on both ends (factory fitted)
  • Matching flanges for both ends

Useful additions

  • Secondary silencer Type CA, CS or CF
  • Heat exchanger Type WL
  • Electric air heater Type EL

Construction features

  • Circular casing
  • Spigot suitable for circular ducts to EN 1506 or EN 13180
  • Spigot with groove for lip seal (RN-P1/80 and RN-A2/80 without groove)
  • RN-FL: Circular flanges to EN 12220

Materials and surfaces

Galvanised sheet steel construction

  • Casing made of galvanised sheet steel
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel
  • Polyurethane bellows
  • Plain bearings with PTFE coating
  • Leaf spring made of stainless steel


Powder-coated construction (P1)

  • Casing made of galvanised sheet steel, powder-coated
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel, powder-coated


Stainless steel construction (A2)

  • Casing made of stainless steel 1.4301
  • Interior parts made of stainless steel


Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Rubber profile for the insulation of structure-borne noise
  • Lining is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC

Standards and guidelines

  • Hygiene conforms to VDI 6022
  • Casing air leakage to EN 1751, class C

Maintenance

  • Maintenance-free as construction and materials are not subject to wear

Technical information

Function, Technical data, Quick sizing, Specification text, Order code, Produktbeziehungen

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code
Schematic illustration of the RN 00131246_0
① Damper blade
② Bellows
③ Bellows inlet
④ Crossbar
⑤ Leaf spring
⑥ Cam plate
⑦ Volume flow rate scale lock
⑧ Volume flow rate scale
⑨ Lip seal


Functional description

The volume flow controller is a mechanical self-powered unit and works without external power supply. A damper blade with low-friction bearings is adjusted by aerodynamic forces such that the set volume flow rate is maintained within the differential pressure range.

The aerodynamic forces of the airflow create a closing torque on the damper blade. The bellows extends and increases this force while at the same time acting as an oscillation damper. The closing force is countered by a leaf spring that unrolls over a cam plate. The shape of the cam plate is such that a change in the differential pressure leads to an adjustment of the damper blade in a way that the volume flow rate is maintained almost exactly.

Efficient commissioning

The volume flow rate setpoint value can be set quickly and easily using the pointer on the external scale; no measurements are required.

The advantage over flow adjustment dampers is that there is no need for repeat measurements or adjustments by an air conditioning engineer. Should the system pressure change, e.g. by opening or closing of duct sections, the flow rates in the entire system will also change if flow adjustment dampers are used; however, this is not the case with mechanical self-powered volume flow controllers A mechanical self-powered controller reacts immediately and adjusts the damper blade such that the set constant volume flow rate is maintained.

Volume flow rate ranges

The minimum differential pressure of CAV controllers is an important factor in designing the ductwork and in rating the fan including speed control.

Sufficient duct pressure must be ensured for all operating conditions and for all control units. The measurement points for fan speed control must be selected accordingly.

Nominal sizes

80 – 400 mm

Volume flow rate range

11 – 1400 l/s or 40 – 5040 m³/h

Volume flow rate control range

Approx. 25 to 100 % of the nominal volume flow rate

Scale accuracy

± 4 %

Minimum differential pressure

50 Pa (nominal size 80: 100 Pa)

Maximum differential pressure

1000 Pa

Operating temperature

10 – 50 °C




Quick sizing tables provide a good overview of the room sound pressure levels that can be expected. Approximate intermediate values can be interpolated. Precise intermediate values and spectral data can be calculated with our Easy Product Finder design programme.

The first selection criteria for the nominal size are the actual volume flow rates Vmin and Vmax. The quick sizing tables are based on generally accepted attenuation levels. If the sound pressure level exceeds the required level, a larger air terminal unit and/or a silencer is required.

Sizing example

Given data

Vmax = 280 l/s (1010 m3/h)

Δpst = 150 Pa

Required sound pressure level in the room 35 dB(A)

Quick sizing

RN/200 with circular silencer CS 050/200×1000

Air-regenerated noise LPA = 26 dB(A)

Case-radiated noise LPA = 31 dB(A)

RN, Sound pressure level at differential pressure 150 Pa

Nominal size V Air-regenerated noise Case-radiated noise
Nominal size V
Nominal size V LPA LPA1 LPA2 LPA3
Nominal size l/s m³/h dB(A)

80

11

40

37

24

17

15

22

<15

80

20

72

39

27

19

17

24

<15

80

40

144

47

34

24

22

31

<15

80

45

162

48

35

25

24

32

<15

100

22

79

37

24

17

15

22

<15

100

40

144

40

29

22

20

21

<15

100

70

252

47

35

27

26

29

<15

100

90

324

50

38

30

29

33

<15

125

35

126

37

27

21

18

15

<15

125

60

216

43

34

27

25

19

<15

125

115

414

50

41

35

33

27

<15

125

140

504

52

44

39

37

30

<15

160

60

216

40

32

26

24

29

<15

160

105

378

45

37

32

29

33

<15

160

190

684

49

41

35

33

39

<15

160

240

864

50

41

36

34

41

16

200

90

324

40

31

24

22

28

<15

200

160

576

43

35

28

26

32

<15

200

300

1080

48

40

33

32

40

17

200

360

1296

49

41

35

33

42

20

250

145

522

41

32

24

22

29

15

250

255

918

42

34

28

26

33

<15

250

470

1692

46

39

33

31

40

19

250

580

2088

48

41

35

34

43

22

315

230

828

39

33

26

23

30

<15

315

400

1440

42

35

29

27

35

<15

315

750

2700

44

38

32

31

40

19

315

920

3312

46

41

35

34

43

23

400

350

1260

46

39

33

29

45

<15

400

610

2196

48

42

36

32

49

18

400

1130

4068

50

44

38

35

54

24

400

1400

5040

51

45

40

37

56

27

① RN

② RN with secondary silencer CS/CF, insulation thickness 50 mm, length 500 mm

③ RN with secondary silencer CS/CF, insulation thickness 50 mm, length 1000 mm

④ RN with secondary silencer CS/CF, insulation thickness 50 mm, length 1500 mm

⑤ RN-D


Circular volume flow controllers for constant air volume systems, mechanical self-powered, without external power supply, suitable for supply or extract air, available in 8 nominal sizes.

Ready-to-commission unit consists of the casing containing a damper blade with low-friction bearings, bellows, external cam plate and leaf spring.

Volume flow controllers without actuators are factory set to a reference volume flow rate (customers can set the required volume flow rate on site).

Spigot with groove for lip seal, suitable for connecting ducts according to EN 1506 or EN 13180.

Casing air leakage to EN 1751, class C.

Special features

  • Volume flow rate can be set using an external scale; no tools required
  • High volume flow rate control accuracy
  • Any installation orientation

Materials and surfaces

Galvanised sheet steel construction

  • Casing made of galvanised sheet steel
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel
  • Polyurethane bellows
  • Plain bearings with PTFE coating
  • Leaf spring made of stainless steel


Powder-coated construction (P1)

  • Casing made of galvanised sheet steel, powder-coated
  • Interior parts, nominal sizes 80 – 125: stainless steel 1.4301, nominal sizes 160 – 400: galvanised sheet steel, powder-coated


Stainless steel construction (A2)

  • Casing made of stainless steel 1.4301
  • Interior parts made of stainless steel


Variant with acoustic cladding (-D)

  • Acoustic cladding made of galvanised sheet steel
  • Rubber profile for the insulation of structure-borne noise
  • Lining is mineral wool


Mineral wool

  • To EN 13501, fire rating class A1, non-combustible
  • RAL quality mark RAL-GZ 388
  • Biosoluble and hence hygienically safe according to the German TRGS 905 (Technical Rules for Hazardous Substances) and EU directive 97/69/EC

Construction

  • Galvanised sheet steel
  • P1: Powder-coated, silver grey (RAL 7001)
  • A2: Stainless steel

Technical data

  • Nominal sizes: 80 to 400 mm
  • Volume flow rate range: 11 to 1400 l/s or 40 to 5040 m³/h
  • Volume flow rate control range: approx. 25 – 100 % of the nominal volume flow rate
  • Minimum differential pressure: 50 Pa (nominal size 80: 100 Pa)
  • Maximum differential pressure: 1000 Pa

Sizing data

  • V _______________________ [m³/h]
  • Δpst _______________________ [Pa]

Air-regenerated noise

  • LPA _______________________ [dB(A)]

Case-radiated noise

  • LPA _______________________ [dB(A)]

This specification text describes the general properties of the product. Texts for variants can be generated with our Easy Product Finder design programme.

Notes on the order code

RN-S

  • RN-S-A2/80: no lip seal (D2)


RN

  • RN/80: no flange (FL), no matching flange (G2)
  • RN-A2/80: no lip seal (D2)

Order example: RN/160/D2

Nominal size

160

Material

Galvanised sheet steel

Accessories

Lip seal on both ends


Order example: RN-D-FL/250/G2/B50

Acoustic cladding

With

Flange

Both ends

Material

Galvanised sheet steel

Nominal size

250

Accessories

Matching flanges for both ends

Actuator

B50


 

Variants, Attachments, Dimensions and weight

  • Variants
  • Attachments
  • Dimensions and weight

RN-S

  • Compact-height volume flow controller for constant volume flow rate control
  • Spigot to make connections to the ducting

RN

  • Volume flow controller for constant air volume flow control
  • Spigot to make connections to the ducting

RN-D

  • Volume flow controller with acoustic cladding for constant air volume flow control
  • Spigot to make connections to the ducting
  • For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false ceiling
  • The circular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan and room ends
  • Acoustic cladding cannot be retrofitted

RN-FL

  • Volume flow controller for constant air volume flow control
  • With flanges to make detachable connections to the ductwork

RN-D-FL

  • Volume flow controller with acoustic cladding for constant air volume flow control
  • With flanges to make detachable connections to the ductwork
  • For rooms where the case-radiated noise of the unit is not sufficiently reduced by a false ceiling
  • The circular ducts for the room under consideration must have adequate acoustic insulation (provided by others) on the fan and room ends
  • Acoustic cladding cannot be retrofitted
  • Powder-coated surface (P1) or stainless steel construction (A2) not possible

Materials

Order code detail Part Material Notes

Casing

Galvanised sheet steel


Damper blade

Stainless steel, material no. 1.4301

Nominal size 80

Damper blade

Stainless steel, material no. 1.4310

Nominal sizes: 100, 125

Damper blade

Galvanised sheet steel

Nominal sizes from 160

Shaft

Stainless steel, material no. 1.4301

Nominal sizes 80 to 200

Shaft

Stainless steel, material no. 1.4104

Nominal sizes 250 to 400

Plain bearings

Steel with PTFE coating


D

Acoustic cladding

Galvanised sheet steel


D

Rubber profile for the insulation of structure-borne noise

Rubber


D

Lining

Mineral wool


P1

Casing

Galvanised sheet steel

Powder-coated

P1

Damper blade

Stainless steel, material no. 1.4301

Nominal size 80

P1

Damper blade

Stainless steel, material no. 1.4310

Nominal sizes: 100, 125

P1

Damper blade

Galvanised sheet steel

Powder-coated, nominal sizes from 160

P1

Shaft

Stainless steel, material no. 1.4301

Nominal sizes 80 to 200

P1

Shaft

Stainless steel, material no. 1.4305

Nominal sizes 250 to 400

P1

Plain bearings

Bronze with PTFE coating


A2

Casing

Stainless steel, material no. 1.4301


A2

Damper blade

Stainless steel, material no. 1.4301

Nominal size 80

A2

Damper blade

Stainless steel, material no. 1.4310

Nominal sizes: 100, 125

A2

Damper blade

Stainless steel, material no. 1.4301

Nominal sizes from 160

A2

Shaft

Stainless steel, material no. 1.4301

Nominal sizes 80 to 200

A2

Shaft

Stainless steel, material no. 1.4305

Nominal sizes 250 to 400

A2

Plain bearings

Bronze with PTFE coating



Surfaces

Order code detail Part Surface Notes

Casing

Untreated


P1

Casing

Powder-coated, RAL 7001, silver grey



RN, actuators

Order code detail Actuator Supply voltage Auxiliary switch

Min/Max actuators




B50

Actuator with mechanical stops TROX/Belimo

24 V AC/DC

B52

Actuator with mechanical stops TROX/Belimo

24 V AC/DC

2

B60

Actuator with mechanical stops TROX/Belimo

230 V AC

B62

Actuator with mechanical stops TROX/Belimo

230 V AC

2

Modulating actuators




B70

Actuator with mechanical stops TROX/Belimo

24 V AC/DC

B72

Actuator with mechanical stops TROX/Belimo

24 V AC/DC

2


Anbauteile: VARYCONTROL Regelkomponenten

Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat LVC TVR TVJ TVT TZ-S TA-S TVZ TVA TVM TVRK TVLK





















Easyregler


Dynamisch















Easy

V



Integriert

Integriert







Compactregler


Dynamisch















BC0

V

MP-Bus


Integriert

Integriert





BF0

V

MP-Bus


Integriert

Integriert












BL0

V

LonWorks


Integriert

Integriert






BM0

V

Modbus


Integriert

Integriert













BM0-J6

V

Modbus und steckerfertiger Anschlussleitung


Integriert

Integriert













XG0

V



Integriert

Integriert












XB0

V



Integriert

Integriert






LN0

V



Integriert

Integriert






LK0

V

KNX
















LY0

V



Integriert

Integriert














Compactregler


Statisch















SA0

V



Integriert

Integriert













SC0

Δp



Integriert

Schnelllaufender Stellantrieb integriert















Universalregler


Dynamisch















B11

V



Integriert

Stellantrieb, Drehmoment für TVT












B13

V



Integriert

Stellantrieb







B27

V



Integriert

Stellantrieb












B1B

V



Integriert

Federrücklaufantrieb






XC3

V



Integriert

Federrücklaufantrieb








Universalregler


Statisch















BP1

V

MP-Bus


Separates Bauteil

Stellantrieb, Drehmoment für TVT












BP3

V

MP-Bus


Separates Bauteil

Stellantrieb





BPB

V

MP-Bus


Separates Bauteil

Federrücklaufantrieb





BPG

V

MP-Bus


Separates Bauteil

Schnelllaufender Stellantrieb




BB1

V



Separates Bauteil

Stellantrieb, Drehmoment für TVT












BB3

V



Separates Bauteil

Stellantrieb





BBB

V



Separates Bauteil

Federrücklaufantrieb






XD1

V



Integriert

Stellantrieb





XD3

V



Integriert

Federrücklaufantrieb





BR1

Δp

MP-Bus


100 Pa

Stellantrieb, Drehmoment für TVT












BR3

Δp

MP-Bus


100 Pa

Stellantrieb






BRB

Δp

MP-Bus


100 Pa

Federrücklaufantrieb





BRG

Δp

MP-Bus


100 Pa

Schnelllaufender Stellantrieb







BS1

Δp

MP-Bus


600 Pa

Stellantrieb, Drehmoment für TVT












BS3

Δp

MP-Bus


600 Pa

Stellantrieb









BSB

Δp

MP-Bus


600 Pa

Federrücklaufantrieb









BSG

Δp

MP-Bus


600 Pa

Schnelllaufender Stellantrieb









BG1

Δp



100 Pa

Stellantrieb, Drehmoment für TVT












BG3

Δp



100 Pa

Stellantrieb






BGB

Δp



100 Pa

Federrücklaufantrieb





BH1

Δp



600 Pa

Stellantrieb, Drehmoment für TVT












BH3

Δp



600 Pa

Stellantrieb










BHB

Δp



600 Pa

Federrücklaufantrieb









XE1

Δp



Integriert, 100 Pa

Stellantrieb





XE3

Δp



Integriert, 100 Pa

Federrücklaufantrieb





XF1

Δp



Integriert, 600 Pa

Stellantrieb









XF3

Δp



Integriert, 600 Pa

Federrücklaufantrieb









① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck


Anbauteile: VARYCONTROL Regelkomponenten

Regel- größe Schnittstelle Vmin -/ Vmax - Verstellung Differenzdruck- transmitter Stellantrieb Fabrikat


Easylabregler


Statisch



Elab

RS, RE, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RS, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RE, PC, C

TCU3


Integriert

Schnelllaufender Stellantrieb


Elab

RS, RE, PC, FH, C

TCU3


Integriert

Schnelllaufender Stellantrieb




Elektronischer Regler


Statisch

Elektronischer Regler


TMA

RS, RE, PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE, PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RS, RE,

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE,

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RE ,PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RE ,PC

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


TMA

RS, RE ,PC, FH

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb


TMB

RS, RE ,PC, FH

TCU-LON-II mit LonWorks-Schnittstelle


Integriert

Schnelllaufender Stellantrieb (bürstenloser Motor)


























































XF3

Δp



Integriert, 600 Pa

Federrücklaufantrieb

BB3

V



Separates Bauteil

Stellantrieb

① TROX, ② TROX/Belimo, ③ TROX/Gruner, ④ Sauter, ⑤ Siemens

☒ Bestellschlüsseldetail, V Volumenstrom, Δp Differenzdruck








Installation details, Basic information and nomenclature

  • Installation details
  • Basic information and nomenclature

Installation and commissioning

  • Any installation orientation
  • Volume flow rate can be set using an external scale; no tools required
  • No repeat measurements or adjustments by an air conditioning engineer are necessary
  • RN-D: For constructions with acoustic cladding, ducts on the room side should have cladding up to the acoustic cladding of the controller

Upstream conditions

The volume flow rate accuracy ΔV applies to a straight upstream section of the duct. Bends, junctions or a narrowing or widening of the duct cause turbulence that may affect measurement. Duct connections, e.g. branches off the main duct, must comply with EN 1505. Some installation situations require straight duct sections upstream.

Free air intake only with a straight duct section of 1D upstream.

Space required for commissioning and maintenance

Sufficient space must be kept clear near any attachments to allow for commissioning and maintenance. It may be necessary to provide sufficiently sized inspection access openings.

Space required

Attachments
Attachments mm

Without actuator

200

200

200

With actuator

200

320

300


Prinipal dimensions

ØD [mm]

Outside diameter of the spigot

ØD₁ [mm]

Pitch circle diameter of flanges

ØD₂ [mm]

Outside diameter of flanges

ØD₄ [mm]

Inside diameter of the screw holes of flanges

L [mm]

Length of unit including connecting spigot

L₁ [mm]

Length of casing or acoustic cladding

B [mm]

Duct width

B₁ [mm]

Screw hole pitch of flange (horizontal)

B₂ [mm]

Outside dimension of flange (width)

B₃ [mm]

Width of device

H [mm]

Duct height

H₁ [mm]

Screw hole pitch of flange (vertical)

H₂ [mm]

Outside dimension of flange (height)

H₃ [mm]

Unit height

n [ ]

Number of flange screw holes

T [mm]

Flange thickness

m [kg]

Unit weight including the minimum required attachments for manual adjustment

Acoustic data

fm [Hz]

Octave band centre frequency

LPA [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA1 [dB(A)]

A-weighted sound pressure level of air-regenerated noise of the VAV terminal unit with secondary silencer, system attenuation taken into account

LPA2 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit, system attenuation taken into account

LPA3 [dB(A)]

A-weighted sound pressure level of case-regenerated noise of the VAV terminal unit with acoustic cladding, system attenuation taken into account


All sound pressure levels are based on 20 μPa.

Volume flow rates

Vnom [m³/h] and [l/s]

Nominal volume flow rate (100 %)

  • The value depends on product type and nominal size
  • Values are published on the internet and in technical leaflets, and stored in the Easy Product Finder design software.
  • Upper limit of the setting range and maximum volume flow rate setpoint value for the CAV controller

V [m³/h] and [l/s]

Volume flow rate

ΔV [± %]

Volume flow rate tolerance from setpoint value

Differential pressure

Δpst [Pa]

Static differential pressure

Δpst min [Pa]

Static differential pressure, minimum

  • The static minimum differential pressure is equal to the pressure loss of the CAV controller when the damper blade is open, caused by flow resistance (bellows, crossbar)
  • If the pressure on the CAV controller is too low, the setpoint volume flow rate may not be achieved, not even when the damper blade is open
  • Important factor in designing the ductwork and in rating the fan including speed control
  • Sufficient duct pressure must be ensured for all operating conditions and for all controllers, and the measurement point or points for speed control must have been selected accordingly to achieve this

Construction

Galvanised sheet steel

  • Casing made of galvanised sheet steel
  • Parts in contact with the airflow as described for the product type
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Powder-coated surface (P1)

  • Casing made of galvanised sheet steel, powder-coated RAL 7001, silver grey
  • Parts in contact with the airflow are powder-coated or made of plastic
  • Due to production, some parts that come into contact with the airflow may be stainless steel or aluminium, powder-coated
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

Stainless steel (A2)

  • Casing made of stainless steel 1.4201
  • Parts in contact with the airflow are powder-coated or made of stainless steel
  • External parts, e.g. mounting brackets or covers, are usually made of galvanised sheet steel

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