900 43 Hamuliakovo 277

The Slovak Republic

Tel.: 00421 /2 /40203111

40203112

Fax: 00421 /2 /45989179

Email: imos@imos.sk

http://www.imos.sk

TPI 33-02

CONSTANT AIR FLOW CONTROLLER

IMOS - RPK

TECHNICAL SPECIFICATIONS

This product is protected by industrial design pattern filed by UPV SR

1 TPI 33-02

These specifications define the size, properties, application range and construction features of RPK constant airflow controllers. The specifications apply to designing, ordering, manufacturing, acceptance, delivery and useof these products as of 1st January 2002.

I. TERMINOLOGY

The constant air flow controller is an air-engineering device that maintains constant volume air flow within fluctuating pres-

sure range without any subsidiary energy source. The jacket of the controller is a component providing for air flow, attach-

ment to the remaining parts of the air-engineering system and fixation of functional control device elements. The controller

blade represents the functional surface of the control and adjustment apparatus. The adjustment apparatus serves for set-

ting the required constant air flow according to the scale installed. The absorber is a stabilising component of controller ap-

paratuses that is active during sudden mode changes in primary tubes. The controller cover is a part of the controller pro-

tecting its functional parts.

II. GENERAL SPECIFICATIONS

The constant air flow controller, hereinafter referred to as RPK, is an air-engineering device which can be used in systems

where certain operational modes can generate fluctuating currents in spite of the requirement that behind the controller in-

stallation point constant air flow is needed. The RPK controller needs no energy supplies for its operation and is charac-

terised by small dimensions, high controlling accuracy and simple installation providing for a direct connection with the tube.

In addition, no maintenance is required. The controller is designed for indoor operation without direct weather influences

at temperatures from -20° to 80°C, pressure difference up to 600 Pa and relative humidity up to 80%. We recommend main-

taining air flow velocity between 2.2 to 10 m.s-1. The controller starts its operation according to its nominal size and the

regulated amount of air when the minimum pressure difference between the front and rear part of the controller reaches 35

to 55 Pa. The control of larger air volumes requires a higher difference in pressure. Using this constant air flow controller,

air-engineering equipment designers have a device at their disposal that needs no energy supply while providing for the pa-

rameters designed.

Picture of the Constant Air Flow Controller

Fig 1 RPK Constant Air Flow Controller

2 TPI 33-02

Description

RPK constant air flow controllers enable to control specifically required air volumes in individual branches of air-

engineering systems. The user can set the required constant volume by turning the screw positioned on the right side of

the cover and positioning the indicator mark against the respective scale mark. The internal setting of constant outflow air

volume proceeds through the movement of the air put to the controller blade, which is transmitted to a special spring.

The standard manufacturing version of RPK includes the jacket and other sheet-metal parts made of zinc-coated construc-

tion steel sheets. Similarly, all metallic components are zinc-coated to protect their surface from outer influences. The spe-

cial spring is zinc-coated, made of high-quality flexible steel. Special bearings fit for a wide range of temperatures need no

greasing. Depending on the customers' wishes, the RPK controller can also be made of stainless steel (except for bear-

ings and the special spring) and the outer surface of the controller can be treated with dry colour of any RAL class hue.

Product ordering

Construction Features of the Constant Air Flow Controller

The order must include the following information:

sesignation: XXX - XXX - XXX - RAL....RPK constant air flow controller RPKsize 100

125140160180200250315

made of stainless steel STAsurface finish RAL

ordering exampleRPK - 125 - STA 2 pieces TPI 33-02RPK - 125 - RAL9010 2 pieces TPI 33-02

Product specifications

The product has a label attached to it including the following information:

a) name and registered office of the company

b) product designation

c) nominal dimension

d) quality inspection record

e) air flow direction

3 TPI 33-02

III. TECHNICAL SPECIFICATIONS

The nominal dimensions of individual controllers, their lengths, speed and flow rate ranges, installation dimensions and weight

specifications are specified in the figures and tables attached. Overall weight data are specified with ±5% tolerance.

Fig. 2 RPK Technical Specifications

Tab. 1 Main Parameters of the RPK Constant Air Flow Controller

*- special production on specific order: 3,6-10,4 m.s-1, 157-460 m3.s-1

4 TPI 33-02

Tab. 2 Acoustic Performance Values Generated by Air Circulation with the RPK Device

Chart 1 Minimum difference of static pressures in the flow controller

5 TPI 33-02

Chart 2 Quick Selection of RPK Type

There is one system with variable air flow and a room into which the constant air volume must be transported - 300 m3.h-1.

Maximum allowed noise level in the room is 50 dB(A) and maximum pressure difference on the controller is 250 Pa. The

average absorptance of the room α=0.15 and the absorption of the room is 8 dB.

- the preliminary selection of the controller size will be made using Fig. 4.

next, air circulation velocity will be calculated - 4,0 m.s-1

- noise parameters must be checked using Tab. 2

fm

[Hz] 63 125 250 500 1000 2000 4000 8000

noise of the controller 55 55 53 48 45 44 40 39

room absorption -8 -8 -8 -8 -8 -8 -8 -8

correction for A balance filter -26 -16 -9 -3 0 +1 +1 +1

resulting noise level 21 31 36 37 37 37 33 32 LPA

= 44 dB(A)

The flow controller can be accepted supposing that the noise of the system in front of the controller and the noise of the

distribution element both comply with the required noise parameters of the room.

IV. EXAMPLE OF SELECTING THE AIR FLOW CONTROLLER

Explanatory notes:

* [m3.h-1] - air flow through the controller

∆* [± %] - accuracy of the pre-set air flow through the controller

v [m.s-1] - average air speed through the controller

∆pp

[Pa] - pressure loss caused by the controller

fm

[Hz] - octave spectrum frequency

LW

[dB/Okt.] - acoustic performance value

6 TPI 33-02

V. INSPECTION, ACCEPTANCE AND WARRANTY

The inspection of product completion and quality is performed by the manufacturer. All RPK controllers are checked for

functionality and, if required in advance, pre-set to specified values. Product parameters are verified according to inspec-

tion regulations and the acceptance of the product is performed in accordance with valid ASEK s.r.o. company regulations.

The RPV constant air flow controller is supplied in the assembled state. The manufacturer provides a 12-month product war-

ranty valid from the installation date with the maximum warranty of 18 months since the shipment date.

VI. INSTALLATION AND MAINTENANCE

The installation of the controller in the tube is made by usual installation methods used for air-engineering elements. Before

installing, the tube opening designed for controller tails to be inserted must be checked. During the installation process,

the controller jacket must not be damaged because it could block and disable the controller blade. The controller can be

installed in horizontal, slanting and vertical tubes but the blade rotation axis must remain in a horizontal position. The device

must be installed in a correct orientation to ensure air inflow from the side nearer to the controller blade. According to the

controller size, the controller should be mounted to the tube using φ3.2 x 13 to φ3.9 x 16 studs or equally-sized clenches.

Finally, the joint should be sealed with a sealing tape. After finishing the installation process, you should set the flow volume

by turning the setting screw with its head protruding on the right side of the cover. The required constant volume is set by

turning the setting screw - clockwise rotation increases the value being set while it is decreased by anticlockwise move-

ment. If you install the controller, you should provide enough space to access the setting screw. You should also take care

to prevent the bearing body standing out from the controller jacket from touching other elements. To enable a failure-free

operation of the regulator, you must firmly fix the tube and the flexible hoses attached to it. The influx part of the tube must

be cleared from impurities. During its period of service, there is no need to perform any maintenance of the controller. For

this reason, the access to controller elements is completely blocked.

Fig. 3 RPK Installation Procedure

7 TPI 33-02

VII. PACKING, SHIPMENT AND STORAGE

RPV products are shipped in cardboard packages. When ordering large amounts of controllers, you can contract special

conditions of their packing, arrangement on paletts and transport. Customers are advised to abide by environmental regu-

lations and collect used packages for recycling at their own expense. Controllers are shipped by common means of trans-

port at the customer's expense. It is recommended that you store RPK products indoors and in a dry place.

VIII. PRODUCT EXAMINATIONS

The manufacturer constantly examines the quality of its products supplied. RPK products comply with legal regulations con-

cerning product examination and certification.

IX. APPENDIX

Any adjustments to the specifications presented here must be discussed with the manufacturer. The manufacturer reserves

the right for technical innovations and is not obliged to announce these changes in advance.

Related standards:STN CR 12 792 Ventilation for buildings. Terminology.

STN EN 1505 Ventilation for buildings. Sheet metal air ducts and fittings with rectangular cross - section.

STN EN 1506 Ventilation for buildings. Sheet metal air ducts and fittings with circular cross - section.