BOGA AIRWIN Ultrasonic Duct Humidifier Instruction Manual Product Information

: May 15, 2024
: BOGA

Table of Contents

AIRWIN Ultrasonic Duct Humidifier
Product Information
Specifications
Product Usage Instructions
1. General Information and Intended Use
2. Safety Instructions
3. Scope of Delivery
- FAQ
Q: What should I do if the humidifier is not producing enough

AIRWIN Ultrasonic Duct Humidifier

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Product Information

Specifications

Type: Ultrasonic Duct Humidifier
Model Numbers:
- NKBD-6/3.1 – Item No. 7900107, 6 outlets, max. capacity 3.6
  kg/h
- NKBD-12/3.1 – Item No. 7900113, 12 outlets, max. capacity 7.2
  kg/h
- NKBD-18/3.1 – Item No. 7900119, 18 outlets, max. capacity 10.8
  kg/h
- NKBD-24/3.1 – Item No. 7900125, 24 outlets, max. capacity 14.4
  kg/h
- NKBD-30/3.1 – Item No. 7900131, 30 outlets, max. capacity 18.0
  kg/h
- NKBD-36/3.1 – Item No. 7900137, 36 outlets, max. capacity 21.6
  kg/h
- NKBD-42/3.1 – Item No. 7900143, 42 outlets, max. capacity 25.2
  kg/h

Product Usage Instructions

1. General Information and Intended Use

Ensure the product is used for its intended purpose as a duct
humidifier.

2. Safety Instructions

Follow all safety instructions provided in the manual to prevent
any accidents or damage.

3. Scope of Delivery

Check that all components specified in the scope of delivery
section are present before installation.

FAQ

Q: What should I do if the humidifier is not producing enough

mist?

A: Check the water level in the humidifier tank and ensure it is
filled to the recommended level. Also, clean the ultrasonic
transducer to remove any buildup that may be affecting mist
production.

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Installation- and Operation Instructions
AIRWIN®
Ultrasonic Duct Humidifier
NKBD-6…42/3.1

Type

Item No. Description

NKBD-6/3.1 7900107 Duct humidifier with 6 outlets

NKBD-12/3.1 7900113 Duct humidifier with 12 outlets

NKBD-18/3.1 7900119 Duct humidifier with 18 outlets

NKBD-24/3.1 7900125 Duct humidifier with 24 outlets

NKBD-30/3.1 7900131 Duct humidifier with 30 outlets

NKBD-36/3.1 7900137 Duct humidifier with 36 outlets

NKBD-42/3.1 7900143 Duct humidifier with 42 outlets

max. capacity 3.6 kg/h 7.2 kg/h
10.8 kg/h 14.4 kg/h 18.0 kg/h 21.6 kg/h 25.2 kg/h

Please read and keep these instructions!

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

8valid from serial number: 5463

No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express permission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

Contents

1. General Informations and Intended Use……………………………………………………………………………………………… 4

2. Safety Instructions …………………………………………………………………………………………………………………………… 4

3. Scope of delivery …………………………………………………………………………………………………………………………….. 5

4. Optional accessories ……………………………………………………………………………………………………………………….. 5

5. General information …………………………………………………………………………………………………………………………. 7

5.1

Technical terms …………………………………………………………………………………………………………………. 7

5.2

Physical principles of piezo ceramics……………………………………………………………………………………. 7

5.3

Funktionsbeschreibung Ultraschall-Luftbefeuchter …………………………………………………………………. 8

6. Advantages of ultrasonic air humidification …………………………………………………………………………………………. 9

7. Equipment overview ………………………………………………………………………………………………………………………. 10

8. The NKBD-6…42/3.1-System …………………………………………………………………………………………………………. 11

9. Installation…………………………………………………………………………………………………………………………………….. 12

9.1

Installation conditions General notes ……………………………………………………………………………….. 12

9.2

Installation conditions special notes…………………………………………………………………………………. 13

9.2.1 Standard configuration………………………………………………………………………………………… 13

9.2.2 Stepped configuration …………………………………………………………………………………………. 14

9.3

Suction operation …………………………………………………………………………………………………………….. 15

9.4

Recommended settings of the airflow …………………………………………………………………………………. 16

9.4.1 Folded sheet and extension on the body duct support …………………………………………….. 16

9.4.2 Closing sheet on the tank cover …………………………………………………………………………… 16

9.5

Adjustment of the NKBD to the direction of airflow ……………………………………………………………….. 17

10. Hydraulic connection ……………………………………………………………………………………………………………………… 18

10.1 Hydraulic conditions …………………………………………………………………………………………………………. 18

10.2 Establishing and detaching the connections with connectors …………………………………………………. 19

11. Electrical Connection ……………………………………………………………………………………………………………………… 20

11.1 Transformer …………………………………………………………………………………………………………………….. 20

11.2 Humidifier ……………………………………………………………………………………………………………………….. 21

11.2.1 Power connection ………………………………………………………………………………………………. 21

11.2.2 Control connection ……………………………………………………………………………………………… 21

11.2.3 Modbus RTU-Interface………………………………………………………………………………………… 22

11.2.4 Safety chain ………………………………………………………………………………………………………. 22

11.2.5 Status Message Operation – Error ………………………………………………………………………… 22

11.2.6 Control signal …………………………………………………………………………………………………….. 23

11.2.7 Operation control continuous ……………………………………………………………………………….. 23

11.2.8 Control via Modbus RTU……………………………………………………………………………………… 23

12. Structure and functions of the control board PCB AIRWIN 3.1 …………………………………………………………….. 24

12.1 Connections ……………………………………………………………………………………………………………………. 24

12.2 Functional description of the control functions ……………………………………………………………………… 26

12.3 Default settings………………………………………………………………………………………………………………… 27

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

12.4 Adjustment options PCB AIRWIN 3.1 …………………………………………………………………………………..28 12.5 State diagram……………………………………………………………………………………………………………………30 12.6 Status Message ………………………………………………………………………………………………………………..31 12.7 LED-Indicator and Decoding……………………………………………………………………………………………….31 12.8 Resetting the maintenance interval ……………………………………………………………………………………..32 12.9 Troubleshooting ………………………………………………………………………………………………………………..33 13. AquaDrain plus hygiene management …………………………………………………………………………………………….34 13.1 Description ……………………………………………………………………………………………………………………….34 13.2 Features …………………………………………………………………………………………………………………………..35
13.2.1 Flushing of water supply line …………………………………………………………………………………35 13.2.2 Drainage of fluid tank……………………………………………………………………………………………37 13.3 AquaDrain plus diagrams……………………………………………………………………………………………………38 14. Dimensioning of cable cross section ………………………………………………………………………………………………….39 15. Commissioning ……………………………………………………………………………………………………………………………….42 15.1 Manual functions: ………………………………………………………………………………………………………………42 15.2 Automatic functions:…………………………………………………………………………………………………………..43 15.3 Make applied settings: ……………………………………………………………………………………………………….43 16. Technical Data………………………………………………………………………………………………………………………………..44 17. Device dimensions / weights …………………………………………………………………………………………………………….45 18. Circuit diagrams………………………………………………………………………………………………………………………………46 19. Care ………………………………………………………………………………………………………………………………………………56 20. Standards ………………………………………………………………………………………………………………………………………58 20.1 EC declaration of conformity according to Machinery directive 2006/42/EC, Annex II 1.A …………..58 20.2 WEEE………………………………………………………………………………………………………………………………58 20.3 Imprint – Copyright……………………………………………………………………………………………………………..58 21. List of figures ………………………………………………………………………………………………………………………………….59 List of tables…………………………………………………………………………………………………………………………………………….60

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express perm ission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

1. General Informations and Intended Use
The device is designed exclusively for the humidification of demineralised water according to the technical specifications. Nebulization of other liquids is not permitted.
All AIRWIN ultrasonic duct humidifiers of NKBD-6…42/3.1 series are designed for installation in air handling units.
The power supply must be 48 V-AC. Operation with a different voltage is not permitted and can lead to a defect of the device.
These installation and operation instructions apply to all AIRWIN® ultrasonic duct humidifiers of NKBD6…42/3.1 series, hereafter referred to as humidifier. It contains important notes for professional installation, start-up, trouble- free operation and proper maintenance and cleaning.
In addition to regular maintenance, proper installation and care of the humidifier help to preserve the value of the device and are conditions for warranty claims.
2. Safety Instructions
The humidifier described in this manual is designed and constructed in accordance with the international safety regulations. Like any other electrical device it has to be handled with care, to ensure safe usage.
In order to guarantee safe operation in all operating conditions, the following safety instructions must be observed.
· The electrical system may only be set up by qualified electricians. In this context, the regulations of DIN VDE series 0100 are fundamental.
· The regulations of the local power supplier concerning the electrical connection (e.g.: residual current circuit breaker, additional potential equalisation etc.) must be complied with.
· An intended choice of electrical cables and connectors must be used.
· Mains voltage and mains frequency of the voltage supply must correspond to the parameters indicated on the identification plate of the humidifier.
· Do not connect a damaged humidifier (e.g.: damaged during transport) to the mains.
· Contact your customer service if you have any queries about the electrical connection, the features or the security of the humidifier.
· Disconnect the humidifier from mains, if it does not work perfectly or if damage has occurred.
· Disconnect the humidifier from mains, if the electrical supply line is damaged.
· Work on the humidifier may only be carried out as described in these instructions.
· Never use high pressure cleaners to clean the humidifier.
· Use grease and oil-free materials only.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

3. Scope of delivery
Duct Humidifier NKBD-6…42/3.1

Installation and operating instructions

Spare part list

Fig. NKBD-30/3.1

Stop cock Ø 10 mm

Straight reducing connection Ø10 mm Ø6 mm

Item No. 0002602

Item No. 0002362

4. Optional accessories

Item no. Type

Description

Tube, PA 0001196 D/d=10/8 mm,
blue

Tube water supply D = 10 mm (blue)

Illustration

Tube, PE 0001847 D/d=14/11 mm,
nature

Tube water drainage D = 14 mm (nature)

2000105 Mounting brackets 200140.. Vertical frame

For easy installation of NKBD on a mounting frame in the air duct, made of V2A-stainless steel, incl. adjustable foot. Needs: 2 pcs for NKBD-6 to NKBD-24
3 pcs for NKBD-30 to NKBD-42
To build a mounting frame in the air duct, made of V2A-stainless steel, height adjustable from 500-700 mm or 700-1200 mm or 1200-2000 mm PU = 1 set (2 pcs)

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express perm ission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

Item no. Type 200141.. Telescopic strut
6100097 BO-80

Description
To build a mounting frame in the air duct, made of V2A-stainless steel, length adjustable from 500-800 mm or 800-1400 mm or 1400-2000 mm PU = 1 set (2 pcs)

Illustration

Duct hygrostat for ON/OFF control of the humidification system, 1-step

6100095 BO-80/2

Duct hygrostat for ON/OFF control of the humidification system, 2-step

77001.. ST500 ST1600

Transformer for control cabinet installation, from 500 VA to 1600 VA, with primary and secondary protection

77002..

STH500 STH1600

Transformer in powdered steel housing, with illuminated ON / OFF switch and cable glands from 500 VA to 1600 VA, with primary and secondary protection

6002100 SUR/P-4b

Control cabinet with room humidity sensor or duct humidity sensor for continuous control

60121.. SUR/PT…

Control cabinet with room humidity sensor or duct humidity sensor for continuous control and 500, 1000 or 1600 VA Transformer

8005.. BO-RO-…

Reverse osmosis system 6 l/h and more, with permeate storage tank, other models on request

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

5. General information
5.1 Technical terms

Transducer

Aerosols

Demineralised water :

Concentrate

Piezo ceramic transducer
Finely distributed material (solids or liquids) in air or other gases, manifestations are e.g.: in smoke, dust, vapour and nebula
Pure water, permeate
Concentrated water, waste water of reverse osmosis system

5.2 Physical principles of piezo ceramics
If certain crystals are deformed by mechanical stress, electrical charges will build up proportionally on their surface, producing electric field strength in the crystal.

This effect was discovered by Pierre and Jacques Curie in 1880. Even the reversal of this so-called piezoelectric effect or piezo-effect is possible. The same materials change their dimensions under the influence of an electric field.

Oscillation line – piezo ceramics

Fig. 1 – Schematic sketch of piezo-effect

Ceramic piezoelectric materials are hard, chemically inactive and completely insensitive to humidity or other atmospheric influences.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express perm ission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

5.3 Funktionsbeschreibung Ultraschall-Luftbefeuchter
All frequencies above 20,000 Hz are called ultrasonic.
According to their physical nature, acoustic waves consist of mechanical oscillations of compressible media. These oscillations develop due to the deflection of the particles of a compressible material from their equilibrium position. Acoustic waves are bound to a medium and thus do not occur in the vacuum.
Oscillations develop as a result of a change in pressure. Repeated pressure increase and pressure reduction produce different acoustic waves.
In order to be able to use ultrasonic waves for air humidification, electrical energy must be converted into mechanical energy. This takes place in the piezoelectric transducer.
A vibration unit consists of the resonance circuit where the high frequency of ~ 1.7 MHz is produced and the piezoelectric transducer to convert the electrical frequency into a proportional mechanical oscillation. This frequency is not audible for human beings or animals.

The piezoceramic transducers are attached to the bottom of the fluid tank. During excitation of the transducer, the water leads the ultrasonic vibrations to the boundary layer between water and air. Constant compression and decompression of the water gauge over the transducer causes cavitation in the immediate proximity of the water surface. Thus, crossing capillary waves are developed, the finest water particles of which, the aerosols, are produced in the wave crest.

Point of focusing Capillary waves

Air bubbles

Demineralised water

Fluid tank

Ultrasonic transducer

Fig. 2 – Schematic sketch aerosol production

The aerosols are delivered by the air flow in the humidifier and quickly mix with the ambient air. They have a small diameter (0.001 – 0.005 mm) and thus form a freely floating mist. The droplet diameter depends on the surface tension and the density of the medium, but also on the excitation frequency. The higher the excitation frequency, the smaller is the diameter of the droplets.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

6. Advantages of ultrasonic air humidification

1. maximum energy saving

Compared to steam and infrared humidifiers with the same humidification output, ultrasonic air humidifiers need up to 93 % less electricity.

2. lowest connected load

Compared to electrode steam humidifiers with the same humidification output, only approx. 7 % of the power input is required. Thus, lower third-party connection costs are possible.

3. energy-saving cooling effect

During humidification with the ultrasonic air humidifiers, the room air is cooled at the same time due to the adiabatic humidification principle. The result is a lower heat load reducing the cooling output requirements.

4. lowest water consumption 5. immediate max. humidification

Nebulizer humidifiers lose up to 70 % of the water, steam humidifiers up to 30 %. AIRWIN® Ultrasonic air humidifiers do not have any water loss apart from the cyclical emptying process of the fluid tank on AquaDrain plus.
Simultaneously with the request impulse, humidification is carried out without any delay. Exception: during automatic drainage and line flushing.

6. max. evaporation of the water

Ultrasonic air humidifiers produce a very fine aerosol mist. On average, the diameter of the aerosols is only 0.001 0.005 mm. Thus, the mist spreads quickly and is taken up by the air after a very short time

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express perm ission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

7. Equipment overview

Outlets

Air baffle, height adjustable

Fig. 3 – Device overview NKBD-30/3.1
Power supply 48 V / 50 Hz
Interface for control signals

Demineralised water inlet Push-in-connection Ø 10 mm
Water overflow and drainage Push-in-connection Ø 14 mm

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

8. The NKBD-6…42/3.1-System

Fig. 4 – Schematic illustration of NKBD-12/3.1 air humidification system
Definitions 1. NKBD 2. Stop cock (included in the scope of delivery) 3. Conductivity meter (e.g.: BO-CM-1) to check the quality of the demineralised water (see optional accessories, REOS product range) 4. Reverse osmosis system (see REOS product range) 5. Drinking water supply (on site) 6. Free discharge according to DIN 1988-100 (on site) 7. External control (hygrostat or continuous control signal – see AIRWIN product range) 8. Transformer (see AIRWIN product range)

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions
No liability accepted for translation or printing errors. Subject to changes in dimensions, weights and other technical data. All rights reserved. Modifications, reprints and photomechanical reproduction, even in extract from, require the express perm ission of BOGA GmbH, Werkstraße 16, D-59494 Soest.

9. Installation
Proper installation in accordance with the following instructions will ensure trouble-free operation of the humidifier.
The location of the humidifier installation is predetermined by the requirements of the ventilation system and should be defined before installation work starts.
The humidifier must not be exposed to large temperature differences during installation as there is otherwise a danger of condensation inside the humidifier which could lead to a failure of the integrated electronics.
Protect humidifier interiors necessarily from pollution! The protective foil on the exhaust hoods should only be removed immediately prior to commissioning when the air ducts have been cleaned!
9.1 Installation conditions General notes
· The place of installation must allow the humidifier to be easily removed and replaced.
· The NKBD must be installed in absolutely horizontal position to ensure that ALL the ultrasonic transducers are covered by the same level of water.
· The automatic drainage of the fluid tank and the automatic flushing of the demineralised water line require a free discharge on site according to DIN 1988-100.
· In the immediate vicinity of the duct humidifier, the ventilation unit should be of waterproof design (stainless steel or with corrosion-proof coating) and should be provided with a water discharge outlet.
· The air velocity in the free duct cross section (net area after installation of the humidifiers) V = 1.0 – 4.0 m/s.
· The distance from the bottom edge of the NKBD to the ceiling of the air duct must be min. 390 mm (Fig. 5 and Fig. 7).
· The distance between the NKBD and the duct/trough base must be min. 100 mm (Fig. 5 and Fig. 7).
· The distance between the NKBD control housing and the duct side wall must be min. 70 mm (Fig. 6 und Fig. 8).
· The distance between the NKBD and the duct side wall must be min. 200 mm (Fig. 6 and Fig. 8).
· Solid objects must not be installed within the humidification distance in order to avoid condensation.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

9.2 Installation conditions special notes
9.2.1 Standard configuration
Mounting example on mounting frame (on site) with mounting bracket NKBD (Item no. 2000105).
Fig. 5 – Side view into an air duct with one NKBD
The humidifiers can be arranged directly one above the other. The vertical distance between the humidifiers should be 140 mm.

Fig. 6 – View into an air duct in direction of air flow, two NKBD mounted one above the other

9.2.2 Stepped configuration
Humidifiers are mounted one above the other; offset horizontally (Fig. 7 and Fig. 8). Mounting example on mounting frame (on site) with NKBD mounting brackets (Item No. 2000105). Stepped configuration is necessary
· if the permissible air velocity would be exceeded on standard configuration or · if more humidification is necessary than would be possible with the standard
configuration. The minimum vertical distances are smaller than with the standard configuration, which permits installation of more units and thus increased humidification. Requirements: · With stepped configuration, the vertical distance between several humidifiers must be 70 mm · The minimum horizontal distance between several humidifiers must be 80 mm. · Several humidifiers should be evenly distributed over the entire duct width, observing the minimum distance of 200/100 mm from the duct walls.
Fig. 7 – Side view into an air duct with three NKBD

Fig. 8 – View into an air duct in direction of air flow, three NKBD mounted above each other

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

9.3 Suction operation
During suction operation is to ensure that the aerosol mist of the humidifiers is not constricted by the suction of the fan! As may be the case fit a 50 % perforated plate – consider pressure loss!
Fan
Fig. 9 – Side view NKBD in the air duct Suction opening

Suction opening constriction Fig. 10 – Top view NKBD in the air duct
Avoid constriction of the aerosol mist!

9.4 Recommended settings of the airflow
9.4.1 Folded sheet and extension on the body duct support
Set the folded sheet at the minimum distance to the body duct support for the first setting.
Fig. 11 – Set folded sheet In addition, the extension is set at the maximum distance to the folded sheet.

Fig. 12 – Set extension
9.4.2 Closing sheet on the tank cover
The air inlet slit is set to a minimum by the closing sheet.

Fig. 13 – Set closing sheet
Depending on the duct design and air velocity, these basic settings can be modified to optimize the humidification capacity.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

9.5 Adjustment of the NKBD to the direction of airflow

The NKBD can be adjusted to the flow direction of the duct air. Therefore, if required, the duct support must be rotated by 180° and the closing sheet must be mounted on the opposite side. This allows the humidifier to be situated in a favourable position for the water and electrical connection.

NKBD

direction of the air stream

duct support

180°
closing sheet Fig. 14 – Rotate duct support

direction of the air stream

10. Hydraulic connection
10.1 Hydraulic conditions

Fig. 15 – Schematic diagram of hydraulic conditions
Definitions 1. NKBD-12/3.1 2. Water overflow and discharge, for tube Ø 14 mm 3. Water supply for tube Ø 10 mm 4. Stop cock (included in the scope of delivery) 5. Demineralised water: 1 bar < pressure 4 bar 5 µS/cm < conductivity 20 µS/cm 6. Water demineralisation system (reverse osmosis system) 7. Drinking water supply (on site) 8. Concentrate 9. Free discharge according to DIN 1988-100 (on site)
Important notes:
· The humidifier may be operated with fully demineralised water only (produced for example by a reverse osmosis system). The demineralised water must have a conductivity of min. 5 µS/cm and max. 20 µS/cm.
· The contamination of drinking water may not exceed the max. values laid out in the drinking water regulations
· The demineralised water is corrosive, therefore use stainless steel or plastic only. Non-ferrous metals (e.g.: copper, brass) must not be used.
· Water pressure must be minimum 1 bar and maximum 4 bar.
· The drainage system on site must be set in accordance with DIN 1988-100.
· The water overflow- and discharge pipe must be laid with a constant slope of min. 3% (3 cm on 1 m) to the free discharge.
· For easy revision, the stop cock included in the scope of delivery must be installed in the demineralised water supply line close to the device.
All materials coming into contact with the demineralised water must be resistant to demineralised water. Water pipes and tubes must be flushed prior to starting the humidifier.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

10.2 Establishing and detaching the connections with connectors

The connectors provide durable, safe and watertight connections between tube and connecting element. The tube is simply inserted by hand. The retaining element holds the tube safely without pressing it or decreasing the flow.

Establishing the connection Cut tube squarely and free of burrs. Make sure that the tube has no sharp edges, longitudinal grooves or other damage.

support element
stainless steel teeth
Fig. 16 – Establishing the connection

Connection is stable prior to sealing Insert the tube up to the stop. The supporting element holds the tube in the connector. With the help of the o-ring, a tight connection is established.
Check the connection by pulling towards the opposite side By pulling towards the opposite side check whether the tube was safely inserted. Then slide on the locking ring.
Detaching the connection First remove the locking ring. The tube can be detached by pushing back the supporting element.

Fig. 17 – Insert tube

Slide on locking clip

Fig. 18 – Check connection
Remove locking clip press back support element remove tube press back support element
Fig. 19 – Detaching the connection

All pipes, tubes and connecting elements must be resistant to demineralised water.
The surface hardness of pipes and tubes must not exceed 225 HV. Otherwise the retaining teeth in the connector do not securely hold on it.
Soft tubes are also to be avoided.

11. Electrical Connection
11.1 Transformer
· The transformers are available either loose or installed in a sheet metal housing. When installing in the control cabinet, it is essential to make allowance for the heat dissipated from the transformers. The control cabinet may have to be provided with forced-air cooling.
· A single large transformer may be selected to serve several humidifiers. In such cases, make sure that each outgoing secondary circuit is fuse-protected, either external in the control cabinet or within the transformer ex- factory.
· The transformer transforms the primary voltage of 230 V / 50 Hz to the secondary voltage of 48 / 53 V.
· The power connection cable leading to the transformer and from the transformer to the humidifier must at least satisfy H05VV or H05RR specifications.
· The transformers of BOGA are manufactured according to the following specifications: Single-phase control-power transformer in accordance with VDE 0550 Parts 1+3 and VDE 0113, IP00, Protection Class 1, Insulation Class T40E, separate windings, screw-connection in accordance with VBG4, 50/60 Hz.
Fig. 20 – Transformer with one secondary output

Fig. 21 – Transformer with multiple secondary outputs

The neutral conductor (N) on the secondary side must not be earthed!

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

11.2 Humidifier
The electrical connection of the humidifier is made for the electrical power at the 48 V (L, N, PE) bushing terminals and for the regulation, control, safety chain, status message and function control at the 14-pole plug connector in the middle part of the control housing. The terminals are exposed when you release the fasteners on the control housing cover and remove the cover.
Control connection terminals
Power connection terminals

Fig. 22 – Electrical connections

Modbus RTU-Interface

11.2.1 Power connection

Tab. 11-1 – Assignment of power connection terminals

Connection

Name of terminal

L 48 V-AC

N 48 V-AC

protective earth

11.2.2 Control connection

Tab. 11-2 – Assignment of control connection terminals

Contact Description

1 Safety chain 48 V-AC or – 24 V-DC

2 Safety chain 48 V-AC or + 24 V-DC

Error message ST-2 (normally open contact)

Error message ST-2(normally open contact)

Operation message ST-1 (normally open contact)

7 Input Hygrostat 1

8 Input Hygrostat 1

9 Input Hygrostat 2

10 Input Hygrostat 2

11 Control signal input + 4 … 20 mA

12 Control signal input – 4 … 20 mA

13 Control signal input + 0 … 10 V

14 Control signal input – 0 … 10 V

Information Observe the polarity (DC) Observe the polarity (DC) Error message
Error message
Operation message
Operation message 50 % Output Capacity 50 % Output Capacity 100 % Output Capacity 100 % Output Capacity Observe the polarity Impedance 500 Observe the polarity Impedance 500 Observe the polarity Impedance 50 K Observe the polarity Impedance 50 K

11.2.3 Modbus RTU-Interface

Tab. 11-3 – Assignment of D-SUB socket

Description

BOGA MODBUS RTU < COMMON >

BOGA MODBUS RTU < B/B´ >

BOGA MODBUS RTU < A/A` >

5 4 3 2 1
9 8 7 6
Fig. 23 – D-SUB socket

11.2.4 Safety chain

Connect safety chain to the screw-type connectors marked 1 and 2.

Observe the 48 V-AC or 24 V-DC power supply.

B1: limit hygrostat

B2: flow monitor

B3: fan locking

B4: conductivity measurement

Fig. 24 – Safety chain

B5: ON/OFF switch

The input of the safety chain must always be supplied with 48 V AC (alternatively 24 V DC) voltage. Otherwise the humidifier will NOT work! If several humidifiers are connected to the safety chain, they must be connected in parallel to each humidifier. ATTENTION: The feed may only be done once.

11.2.5 Status Message Operation – Error

There are two signal outputs via PhotoMOS relay.

Fig. 25 – PhotoMOS Relais

Umax : 24 V-DC Imax : 50 mA Ron max : 25

Tab. 11-4 – Status messages operation / error

Status message 1 2

Message type Operation message Collective Error message

Connection terminal on the green plug 5 + 6 3 + 4

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

11.2.6 Control signal

The NKBD can process 2 different external controlled variables. · 0-10 V-DC · 4-20 mA

Input resistances (Load)

Control variable 0-10 V-DC 4-20 mA

Input Impedance
50 k 500

11.2.7 Operation control continuous

The humidifier can process different external analog input signals. The output power can be controlled in the smallest stages between 0% and 100% humidifier output.

· 0-10 V-DC · 4-20 mA

(Standard factory setting) (Standard factory setting)

Tab. 11-5 – Thresholds analog input

Control signal Out PWM ON Out 100 %

0-10 V

1.1 V ± 0.5

8.5 V ± 0.5

4-20 mA

5.4 mA ± 0.1

18.5 mA ± 0.5

1-10* V

2.1 V ± 0.5

8.5 V ± 0.5

0-20* mA

1.7 mA ± 0.1

18.0 mA ± 0.5

(*) = Control signal optionally adjustable at the factory

Out PWM OFF 0.9 V ± 0.5 5.2 mA ± 0.1 2.0 V ± 0.5 1.5 mA ± 0.1

11.2.8 Control via Modbus RTU
The NKBD can also be controlled via BOGA Modbus RTU.
Further information can be found in the BOGA Modbus RTU interface description. This can be requested from the manufacturer or viewed and downloaded from the www.boga.de website.

12. Structure and functions of the control board PCB AIRWIN 3.1
12.1 Connections

Inputs
X9 – Connection of float switch: 1: Float switch, level “S1” black 2: Float switch, level “S1” brown 3: Float switch, level “S1” blue 4: Float switch, level “S1” grey

5: Float switch, level “S2” black 6: Float switch, level “S2” brown 7: Float switch, level “S2” blue 8: Float switch, level “S2” grey

X8 – Connection sensor: 1: Current measurement 2: Current measurement +

Notice: Only connections relevant to the device are shown.

12 34 56 7

1 2

1 2 3 4

1 2 34 1 2 34

Fig. 26 – Control board PCB AIRWIN 3.1 Input

X2 – Connection to supply: 1: Power supply L 48 V-AC 2: Power supply N 48 V-AC 3: Release 48 V-AC, 24 V-DC 4: Release 48 V-AC, 24 V-DC

X4 – Connection hyg: 1: Hygrostat input 1 2: Hygrostat input 1 3: Hygrostat input 2 4: Hygrostat input 2

X5
X5: – Connection Reg: 1: Control signal mA + (Ri: 500 ) 2: Control signal mA 3: Control signal V + (Ri: 50 k) 4: Control signal V –

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Outputs
X7 – Connection of solenoid valves 1: Solenoid valve drain L+ 2: Solenoid valve drain N3: Solenoid valve supply L+ 4: Solenoid valve supply N-

X12 – Connection of oscillator boards: 1: PWM 4 – 5: PWM 2 2: PWM 4 + 6: PWM 2

3: PWM 3 – 7: PWM 1 4: PWM 3 + 8: PWM 1 +

X12

1 2 3 4

12 34 56 78

Notice: Only connections relevant to the device are shown.

1 2

1 2 34

Fig. 27 – Control board PCB AIRWIN 3.1 Outputs

X1 – Connection Fan: 1: Relay closing contact 2: Relay closing contact
) not used for NKBD

X3 – Status reports: 1 + 2: Status message 1 (Operation) 3 + 4: Status message 2 (Error)

12.2 Functional description of the control functions
Current measurement of the oscillator boards In this configuration, a current check of the oscillator boards is performed every 3 hours. This test only takes place when the humidification request is present and lasts max. 5 seconds. During this time, the humidifying power is set to 100% and a functional test of all transducers is performed.
Change of the level control Since the level control in the humidifier is an important control, the two existing level float switches are monitored simultaneously. A digital evaluation of the states of both float level levels reliably detects critical and impermissible states.
Check and holding voltage of the solenoid valves The current consumption of the solenoid valves is checked before and during filling. If a fault is detected, the status message ST-2 (error) forwards this information.
Further monitoring-routines Optionally there are monitoring routines for the filling (maximum filling time) and monitoring routines for emptying the fluid tray (maximum drainage time). If a fault is detected, an automatic problemsolving routine will attempt to correct this fault. Furthermore, it is possible to monitor the function of the fan, solenoid valve supply and solenoid valve drain via a current measurement.
If a system component does not work correctly, status message ST-2 (error) forwards this fault information.
The default settings of the control board PCB AIRWIN 3.1 are shown in Tab. 12-1.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

NKBD-6/3. 1 NKBD-12/3.1 NKBD-18/3.1 NKBD-24/3.1 NKBD-30/3.1 NKBD-36/3.1 NKBD-42/3.1

12.3 Default settings
Tab. 12-1 – Default settings PCB AIRWIN 3.1

Time Constants

Parameter

AquaDrain Duration AquaDrain Cycle Time AquaDrain Delay Flush Time Inactivity Flush Timeout Inactivity Drain Timeout Humdification Timeout Fill Timeout Inlet Valve Outlet Valve Fan Oscillator Oscillator Check Intervall Voltage Input Scale Voltage Input Functionality Current Input Scale Current Input Functionality

3 min.

4 min. 12 hours disabled
120 seconds 12 hours

5 min.

12 hours
disabled 15 minutes
enabled enabled disabled enabled
3 hours
0-10 V DC
active
4-20 mA
active

Current Measurment

IOs

12.4 Adjustment options PCB AIRWIN 3.1

AquaDrain Duration:
The AquaDrain duration is the time the humidifier needs to empty the fluid tray. This value is given by design and depends on the type of humidifier, the size of the fluid tray and the installation.

Possible settings:

30 seconds, 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes.

Default setting:

depending on the device type (Tab. 12-1)

AquaDrain Cycle Time
The AquaDrain cycle time is directly linked to the automatic emptying of the fluid tray. The AquaDrain process is also performed when there is a humidification request.

Possible settings:

Disabled, 10 minutes, 30 minutes, 1,5 hours, 3 hours, 6 hours, 12 hours, 24 hours, 48 hours.

Default setting:

12 hours

AquaDrain Delay
The AquaDrain delay is used when several humidifiers are mounted in a system and AquaDrain is enabled. The AquaDrain delay prevents all humidifiers from being emptied at the same time.

Possible settings:

No delay, 1 x 15 minutes, 2 x 15 minutes, 3 x 15 minutes, 4 x 15 minutes, 5 x 15 minutes, 6 x 15 minutes, 7 x 15 minutes

Default setting:

No delay

Flush Time
The flushing time is the time at which the water supply line is flushed before the first operation and after a certain period of inactivity.

Possible settings:

15 seconds, 30 seconds, 120 seconds, 200 seconds

Default setting:

120 seconds

Inactivity Flush Timeout
The “Inactivity Flush Timeout” causes the water supply line to be flushed after a specified time. If the internal fluid tank is empty and the humidifier is in idle mode for this adjustable time, the water supply line is flushed before the internal fluid tank is filled again.

Possible settings:

Default setting, 10 minutes, 30 minutes, 1,5 minutes, 3 hours, 6 hours,12 hours, 24 hours, 48 hours.

Default setting:

12 hours

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Inactivity Drain Timeout
If no humidification is requested, the humidifier is in standby mode. If the fluid tank is still filled, it is automatically emptied after the adjustable time “Inactivity Drain Timeout”.

Possible settings:

Default setting, 10 minutes, 30 minutes, 1,5 hours, 3 hours, 6 hours, 12 hours, 24 hours, 48 hours.

Default setting:

12 hours

Humidification Timeout
The humidification timeout is implemented to check for possible water quality errors. If the humidifier operates for an adjustable amount of time and does not refill, the water may be dirty and cannot be misted. When the “Humidification Timeout” time has elapsed, the humidifier checks the function of the level switches, empties the liquid tank and refills it to remove the contamination. Another cause of this error could be a lack of airflow. This problem-solving process runs three times. If the problemsolving process is unsuccessful, the humidifier will enter the error mode and display the “Humidification Timeout” error.

Possible settings:

Disabled, 5 minutes, 30 minutes, 1,5 hours, 3 hours, 6 hours, 12 hours, 24 hours, 48 hours.

Default setting:

disabled

Fill Timeout
The “Fill Timeout” is the time the humidifier needs to fill the fluid tray. When the time for filling expires, without reaching the necessary fluid level in the fluid tray, a fill error has occurred and a problem solving routine is activated. If the error cannot be cleared, the humidifier displays the “Filling Error”. The time to fill depends on the water supply pressure and the type of humidifier.

Possible settings:

Deaktiviert, 5 minutes, 10 minutes, 15 minutes, 30 minutes, 60 minutes.

Default setting:

15 minutes

Oscillator Check Intervall
The oscillators can be automatically checked after a certain time. If the time interval has expired and a humidification request is present, the humidifier will operate for a short time (approximately 5 seconds) with 100% humidification performance.

Possible settings:

Disabled, 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1,5 hours, 3 hours, 6 hours, 12 hours, 24 hours, 48 hours.

Default setting:

3 hours

Changes to the default values can be made by prior arrangement presetted ex works.

12.5 State diagram

Fig. 28 – State diagram
*: During the “control Oscillators”, the nebulization output is automatically increased to 100% in the humidification mode for a maximum of 5 seconds

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

12.6 Status Message

Tab. 12-2 – Status messages – System States

System State Device switched off no supply voltage Humidification activ
Humidifcation inactiv

Operational message Contact open
Contact closed Contact open

System State Device switched off / no supply voltage Normal operation Fault Mode Error Mode

Error message Contact open Contact closed Contact open

12.7 LED-Indicator and Decoding
There are 4 different colored LEDs on the control board PCB AIRWIN 3.1. Using different flashing and light frequencies all system states are displayed here.
Information about the next service (5,000 working hours) or maintenance interval (10,000 working hours) is also displayed here.

Status LED`s

Fig. 29 – Control board PCB AIRWIN 3.1

Fig. 30 – Decoding LED-Display

12.8 Resetting the maintenance interval

The resetting of the LED display may only be carried out by trained specialists. After service or maintenance has been carried out, the LED display can be reset as follows:

1. Switch off the device and let it drain.

2. Remove the duct support.

3. Deactivate the safety chain by removing the

control unit plug.

4. Switch on the device, wait for the rinsing cycle

and the AquaDrain plus Duration.

5. Do the following action 5 times in a row.

6. Raise level switch S2 to the upper level, wait 1

second and then move it back to the lower level.

7. If the reset of the maintenance interval successful, the LED has gone out.

Fig. 31 – Level switch S2

8. If the LED does not go out, repeat the process.

9. Put the duct support back on and activate the safety chain.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

12.9 Troubleshooting

Tab. 12-3 – Troubleshooting checklist

Error

Displayed error

Significance

Check installation

Check

Error filling

The device is not filled within the specified time

Check inlet water pressure> 1 bar

Check water sieves

Error draining

The device is not emptied within the specified time

Free drain available?

Check fluid tank for cleanliness and clean if necessary
Function magnetic valve, check sequence

Error current measurement supply valve

The solenoid valve supply is Solenoid valve coil

not activated

connected?

Function magnetic valve, check inlet

Check control system
Check control unit settings
Check control unit settings
Check control unit settings

Elimination Restart humidifier Restart humidifier Restart humidifier

No humidification

Error current measurement drain valve

The solenoid valve drain is not activated

Solenoid valve coil connected?

Function magnetic valve, check discharge

Check control unit settings

Error nebulisation timeout
Error level switch
Unknown Error
Error current measurement oscillator boards

A refilling of the fluid tank did not take place during the specified duration (humidification timeout)
Level switch values are not plausible
Unknown error
The power of the oscillators deviates from the reference value outside the tolerance range

Water quality in accordance with technical specifications? Air flow available?
Check exact horizontal installation
Check connection of the device
Optical control of the transducer.

Function magnetic valve, check inlet
Cleaning the fluid tank and level switch

Check control unit settings

Check fluid tank for contamination.

Check level switch functions
Check for visual defects

Check control unit settings

Check the function of the transducer visually
Check service status

Check control unit settings

Restart humidifier
Restart humidifier
Restart humidifier Change level switch Disconnect the power supply for at least 1 minute and then restart
Restart humidifier

Humidification performance
dropped

13. AquaDrain plus hygiene management
13.1 Description
AquaDrain plus is a system designed to flush the demineralised water inlet pipe to the humidifier according to vari-ous parameters and to cyclically empty the fluid tank of the NKBD. To do so, AquaDrain plus uses acertain software and a solenoid valve combination integrated in the housing of the humidifier. In addition, AquaDrain plus prevents that the fluid tank is refilled with water, which had been reduced by evaporation, during the humidification-free periods of the AquaDrain plus cycle.
The AquaDrain plus cycle is the cycle in which the humidifier, minus the time for flushing the water inlet pipe and draining of the fluid tank, can humidify continuously, but does not necessarily have to do so. The AquaDrain plus cycle is 12 hours and the cycle was preset in the factory. Optionally this setting may be changed by the manufacturer see chapter 12.1.4.
If several humidifiers are installed in a system and AquaDrain plus is activated, the AquaDrain plus delay can be used to prevent all humidifiers from being emptied at the same time. For optional factory settings, see chapter 12.4.
Definitions 1. Humidifier
1.1. Solenoid valve drain, integrated 1.2. Solenoid valve supply, integrated 2. Water overflow and drainage 3. Water supply 4. Demineralisation system (reverse osmosis system) 5. Water drainage

Fig. 32 – AquaDrain plus – diagram

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

13.2 Features
13.2.1 Flushing of water supply line
The humidifier goes into flushing mode, which is carried out in two phases depending on the time, for the following events:
1. Initial start-up (operating voltage is present for the first time) 2. Operating voltage is applied again (after each interruption of operation voltage) 3. After each humidifying pause which is longer than the AquaDrain plus cycle
The first phase includes the actual flushing process. The solenoid valves for supply and drain open at the same time for 120 seconds. The water supply pipes and/or tubes are rinsed. This ensures that the FIRST water present in the supply line (possibly hygienically questionable) is not nebulized as it is drained directly without filling up the fluid tank. The flushing volume depends on the pressure of the demineralised water (Fig. 37) and the flush time (Tab. 12-1).
In the second phase the solenoid valve supply is close. The solenoid valve drain remains open for 3, 4 or 5 Min. (Tab. 12-1 ,,AquaDrain Duration”) to ensure that the water that might still be inside the fluid tank is drained.
If a humidification request is made after the second phase, the humidifier will go into normal operation. At the same time, the solenoid valve supply opens and the solenoid valve drain closes. The fluid tank is filled up to maximum level. Humidification starts when there is a humidification request.
The filling time for the fluid tank of the humidifier is determined by the pressure of the demineralised water.
If no humidification request follows after the second phase, the humidifier will go into standby mode until a humidification request is carried out.

Fig. 33 – Example for commissioning and restart
Definitions *) possible AquaDrain plus-Cycles: 10 Min., 30 Min, 1.5 h, 3 h, 6 h, 12 h, 24 h and 48 h (default 12 h, may be changed in the factory upon request) 0) Humidity request OFF 1) Humidity request ON 2) Fluid tank empty 3) Fluid tank full A) Flushing of water supply line B) Drainage of fluid tank
Any humidification request made during the AquaDrain plus duration will be ignored.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

13.2.2 Drainage of fluid tank
The NKBD is drained every 12 hours, if humidification took place in the last AquaDrain plus cycle and in case of any power interruption in the AquaDrain plus cycle (operating voltage is no longer present).
Any humidification request made during the drainage process will be ignored.
If no humidification is requested, the humidifier is in standby mode. If the fluid tub is still full, it will be automatically emptied after the adjustable “Inactivity Drain Timeout”, Tab. 12-1. For optional factory settings, see chapter 12.1.4. If the system is drained, the fluid tank will only be refilled, when a humidification request was made. Time of AquaDrain Duration see Tab. 12-1. The filling time for the fluid tank of the NKBD is determined by the pressure of the demineralised water and the NKBD-Type. The fluid tank will stay dry, if there is no humidification request.

Fig. 34 – Period without humidification

Fig. 35 – New humidification request
A) Flushing of water supply line B) Drainage of fluid tank

13.3 AquaDrain plus diagrams
Fig. 36 – Flow volume solenoid valve supply ND 1.2 mm depending on water pressure

Fig. 37 – Flushing volume in litres at 120 sec flushing time depending on water pressure

Fig. 38 – Drainage volume – fluid tank NKBD…/3.1

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

14. Dimensioning of cable cross section
The ohmic resistance between transformer and humidifier through the power cable produces a loss in voltage and consequently a drop in humidifier output.

The physical distance and the length of cable between the transformer and the humidifier should therefore be kept to a minimum!

The voltage drop caused by ohmic resistance may be reduced by using a cable of large cross section and compensated for by the 53 V secondary connection at the transformer. The graphs Fig. 39- Fig. 45 show the ohmic loss for each humidifier depending on the cable length.
Using the 53 V transformer secondary voltage results in an overvoltage of 5 V (~ 10 % of 48 V) which may be consumed by the ohmic resistance of the cable. The correct cross-section of the cable will always be that which comes closest to the 5V mark for the voltage loss.
On account of the negligible power consumption of the humidifiers, the open- circuit voltage on the other hand is almost equal to the voltage at the transformer. To prevent damage to the humidifier electronics, the open circuit may not exceed 54 V.
Installation costs will be kept to a minimum if the graphs are correctly used.

The dimensions of the transformer is determined not only by the electrical power consumption of the humidifier NKBD but also on the power consumption of the cable feed (ohmic resistance)!

The conductor resistance of fine-stranded:

1.5 mm² = 13.30 /km 2.5 mm² = 7.98 /km 4.0 mm² = 4.95 /km 6.0 mm² = 3.30 /km 10 mm² = 1.91 /km 16 mm² = 1.21 /km 25 mm² = 0.78 /km

(extract from VDE 0295 and IEC 60228 for bare wires, class 5)

Conductor resistances refer to single-stranded conductors. They must therefore be multiplied by 2 for two-stranded conductors (N+L1).

In addition, the load capability of insulated leads (current density) should be taken into account. VDE 0100 Part 430 and Part 523).

The use of shielded Lines (e.g., LiYCY) recommended for the power supply 48V- AC, as well as the signal and control lines,

Fig. 39 – Voltage loss at A = 1.5 mm²

Fig. 40 – Voltage loss at A = 2.5 mm²

Fig. 41 – Voltage loss at A =4 mm²

Fig. 42 – Voltage loss at A = 6 mm²

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 43 – Voltage loss at A = 16 mm²

Fig. 44 – Voltage loss at A = 10 mm²

Fig. 45 – Voltage loss at A = 25 mm²

15. Commissioning
Before commissioning the NKBD, check once again that all installation and wiring work has been carried out correctly and fully completed. In particular, the water and power supply connections must be in proper order and comply with the relevant safety regulations.
15.1 Manual functions:

· Release of permeate inlet into the device

Fig. 46 – Stop cock

· Release of 230 V / 50 Hz to the transformer and switch on transformer

Fig. 47 – Circuit breaker

· The TARGET humidity at the continuous control must be higher than the ACTUAL humidity

Fig. 48 – Continuous controller in the control cabinet

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

15.2 Automatic functions:
· Flushing of water supply line: The solenoid valve supply of the humidifier opens. The solenoid valve drain is open. The water supply line is flushed without the fluid tank of the NKBD being filled. After that, the solenoid valve supply closes again. The solenoid valve drain stays open for 3, 4 or 5 minutes (Tab. 12-1 “AquaDrain Duration”).
· Filling the fluid tank: The Solenoid valve drain closes. The Solenoid valve supply opens. The fluid tank of the NBKD is filled. The water level is automatically controlled within narrow tolerances.
The fluid tank may only be filled if a humidification request has been made. Otherwise the fluid tank of the NKBD will remain dry.
· Humidification: Once the maximum water level is reached and the humidification request is still present, humidification will start.
15.3 Make applied settings:
· Set target humidity
Commissioning of the NKBD is completed.

16. Technical Data
Tab. 16-1 – Technical Specifications

Specifications

NKBD-6 NKBD-12 NKBD-18 NKBD-24 NKBD-30 NKBD-36 NKBD-42

/3.1

max. Humidifying capacity *

kg/h

3.6

7.2

10.8

14.4

18.0

21.6

25.2

Transducer

Unit

Power supply

V / 50 Hz

Power consumption

VA / 50 Hz

185

375

555

735

915

1095

1275

VA / 60 Hz

220

448

660

875

1089

1303

1518

Transformer **

500

1000

1600

Humidifying capacity is dependent on the quantitative air flow rate through the humidifier (air velocity in the duct), on the

uniformity of flow over the entire fluid tank length, on the level of supply voltage under load (nominal 48 V), on the water

temperature and on the cleanliness of the fluid tank and the ultrasonic transducers (regular care).

The power output of the transformers stated is optimised for the NKBD types. Their power reserves are sufficient to bear

the power consumption of a correctly laid supply cable with short distance between humidifier and transformer.

Nevertheless, it is advisable to check transformer selection mathematically according to local conditions.

Tab. 16-2 – Safety devices

Safety devices

Description

Dry-running protection with functional redundancy

If the water level falls below the minimum level in the fluid tank, the humidification switches off. For this purpose, both level switches are monitored separately.

Overheating protection

The humidifier stops humidifying at water temperatures > 60 °C.

Overflow protection

If the humidifier fluid tank is overfilled, the excess water is drained off to the outside through the overflow.

Disconnect protection

There are no defects in the event of electrical interruptions between the oscillator board and the transducer.

Monitoring

Monitoring of important system components with integrated problem solver routines.

Protection against power surges The control board is protected by its own fuse. A varistor in the input of the power supply protects against power surges.

Tab. 16-3 – Operation conditions

Operation conditions

Parameter

Maximum air humidity Air temperature Demineralised water pressure Demineralised water quality Demineralised water conductivity

< 90 % relative humidity no condensation! 5 – 45 °C 1 – 4 bar fully demineralised 5 – 20 µS/cm

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

17. Device dimensions / weights

Tab. 17-1 – Dimensions and weights

Type
NKBD-6/3.1 NKBD-12/3.1 NKBD-18/3.1 NKBD-24/3.1 NKBD-30/3.1 NKBD-36/3.1 NKBD-42/3.1

Weight
kg 6.0 7.7 9.5 11.7 13.7 15.2 17.2

width B
mm 286 436 586 736 886 1036 1186

NKBD…/3.1

Dimensions

depth

height

T T1 T2 H1 min. H1 max.

mm mm mm mm

198 261 288 201

241

198 261 288 201

241

198 261 288 201

241

198 261 288 201

241

198 261 288 201

241

198 261 288 201

241

198 261 288 201

241

Point mounting

P1 P2 P3 P4

mm mm mm mm

124 –

– 231

274 –

– 231

394 –

– 231

544 –

– 231

694 312 382 231

844 387 457 231

994 562 532 231

Fig. 49 – Technical drawing NKBD…/3.1 dimensions

18. Circuit diagrams

Fig. 50 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control voltage

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 51 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control current

Fig. 52 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control voltage

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 53 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control current

Fig. 54 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 1-step on/off

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 55 – 2x NKBD-6…42/3.1, 2x transformer, safety chain, status message, control 1-step on/off

Fig. 56 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 1-step on/off

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 57 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 2-step on/off

Fig. 58 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 2-step on/off

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Fig. 59 – Internal wiring NKBD-6…42/3.1

19. Care
It is essential that the humidifier is easy to inspect and easily accessible on site.
Good accessibility and exchangeability of the humidifier save costs!
Prior to opening the humidifier, it must be disconnected from the electricity and water supply. Then remove the duct support. In case of pollution, the fluid tank of the humidifier must be cleaned by using a clean, medium hard brush and clean water. The transducers must be wiped clean with a soft, scratch-free cloth. Incrustations or solid deposits on the transducers must be carefully removed. For that purpose, it is recommended to use 20 % formic acid.
Deposits are a direct consequence of inadequate water quality!
The care intervals depend on the respective degree of contamination of the humidifier. It depends directly on the cleanliness of the intake air and the feed water quality. It may be necessary to perform care at shorter intervals. The performance of the ultrasonic transducers decreases with actual operating hours. The life time of the ultrasonic transducers will be shortened by unfavourable operating conditions e.g. water and air pollution or overvoltage.

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

Care and cleaning tasks

1. Checks
Check the air duct, the fluid tank and the transducers for contamination. Clean them, if necessary!

Initially, a check has to be carried out after 1 week. Depending on the degree of contamination of the fluid tank and the
transducers the cleaning intervals must be adjusted.

If pollution is found during the check, cleaning must be performed.

2. Care and cleaning
– Fluid tank – Transducers
Measures

Slime in the fluid tank is a sign of the presence of micro-organisms! Cause: Air and/or water
Incrustations are mineral deposits! Cause: Water
· Check and clean the air duct, if required! · Check reverse osmosis system! · Adjust cleaning intervals!

Even without visible pollution, cleaning must be done at least every 12 months.

20. Standards
20.1 EC declaration of conformity according to Machinery directive 2006/42/EC, Annex II 1.A

The resident authorised representative in the community

BOGA GmbH Werkstraße 16 D-59494 Soest

hereby declares that the following product

Product designation: Make: Series/type designation:

Duct humidifier AIRWIN NKBD-6/3.1, NKBD-12/3.1, NKBD-18/3.1, NKBD-24/3.1, NKBD-30/3.1, NKBD-36/3.1, NKBD-42/3.1,

fulfills all the relevant provisions of the directive specified above and the additionally applied directives (in the following) – including the changes which applied at the time of the declaration.

The following additional EU directives have been applied: · EMC Directive 2014/30/EU · RoHS directive 2011/65/EU

The series complies with the safety regulations of VDE 0100 and was tested in accordance with VDE 701 part 1.

20.2 WEEE

The humidifier is WEEE-registered.

20.3 Imprint – Copyright

Imprint Copyright

BOGA GmbH

Gesellschaft für moderne Gerätetechnik

Werkstraße 16

D-59494 Soest

Phone : +49 2921 96943-0

Fax

: +49 2921 96943-29

E-mail : [email protected]

Website : www.boga.de

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[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

21. List of figures
Fig. 1 – Schematic sketch of piezo-effect ……………………………………………………………………………………………..7 Fig. 2 – Schematic sketch aerosol production ……………………………………………………………………………………….8 Fig. 3 – Device overview NKBD-30/3.1……………………………………………………………………………………………….10 Fig. 4 – Schematic illustration of NKBD-12/3.1 air humidification system ………………………………………………..11 Fig. 5 – Side view into an air duct with one NKBD………………………………………………………………………………..13 Fig. 6 – View into an air duct in direction of air flow, two NKBD mounted one above the other…………………..13 Fig. 7 – Side view into an air duct with three NKBD ……………………………………………………………………………..14 Fig. 8 – View into an air duct in direction of air flow, three NKBD mounted above each other ……………………14 Fig. 9 – Side view NKBD in the air duct ………………………………………………………………………………………………15 Fig. 10 – Top view NKBD in the air duct ……………………………………………………………………………………………..15 Fig. 11 – Set folded sheet …………………………………………………………………………………………………………………16 Fig. 12 – Set extension …………………………………………………………………………………………………………………….16 Fig. 13 – Set closing sheet ………………………………………………………………………………………………………………..16 Fig. 14 – Rotate duct support…………………………………………………………………………………………………………….17 Fig. 15 – Schematic diagram of hydraulic conditions…………………………………………………………………………….18 Fig. 16 – Establishing the connection …………………………………………………………………………………………………19 Fig. 17 – Insert tube …………………………………………………………………………………………………………………………19 Fig. 18 – Check connection……………………………………………………………………………………………………………….19 Fig. 19 – Detaching the connection…………………………………………………………………………………………………….19 Fig. 20 – Transformer with one secondary output ………………………………………………………………………………..20 Fig. 21 – Transformer with multiple secondary outputs …………………………………………………………………………20 Fig. 22 – Electrical connections …………………………………………………………………………………………………………21 Fig. 23 – D-SUB socket…………………………………………………………………………………………………………………….22 Fig. 24 – Safety chain……………………………………………………………………………………………………………………….22 Fig. 25 – PhotoMOS Relais……………………………………………………………………………………………………………….22 Fig. 26 – Control board PCB AIRWIN 3.1 Input ……………………………………………………………………………………24 Fig. 27 – Control board PCB AIRWIN 3.1 Outputs ……………………………………………………………………………….25 Fig. 28 – State diagram …………………………………………………………………………………………………………………….30 Fig. 29 – Control board PCB AIRWIN 3.1 ……………………………………………………………………………………………31 Fig. 30 – Decoding LED-Display ………………………………………………………………………………………………………..32 Fig. 31 – Level switch S2 ………………………………………………………………………………………………………………….32 Fig. 32 – AquaDrain plus – diagram ……………………………………………………………………………………………………34 Fig. 33 – Example for commissioning and restart …………………………………………………………………………………36 Fig. 34 – Period without humidification ……………………………………………………………………………………………….37 Fig. 35 – New humidification request ………………………………………………………………………………………………….37 Fig. 36 – Flow volume solenoid valve supply ND 1.2 mm depending on water pressure …………………………..38 Fig. 37 – Flushing volume in litres at 120 sec flushing time depending on water pressure…………………………38 Fig. 38 – Drainage volume – fluid tank NKBD…/3.1………………………………………………………………………………38 Fig. 39 – Voltage loss at A = 1.5 mm² …………………………………………………………………………………………………40 Fig. 40 – Voltage loss at A = 2.5 mm² …………………………………………………………………………………………………40 Fig. 41 – Voltage loss at A =4 mm² …………………………………………………………………………………………………….40 Fig. 42 – Voltage loss at A = 6 mm² ……………………………………………………………………………………………………40 Fig. 43 – Voltage loss at A = 16 mm² ………………………………………………………………………………………………….41 Fig. 44 – Voltage loss at A = 10 mm² ………………………………………………………………………………………………….41 Fig. 45 – Voltage loss at A = 25 mm² ………………………………………………………………………………………………….41 Fig. 46 – Stop cock…………………………………………………………………………………………………………………………..42 Fig. 47 – Circuit breaker ……………………………………………………………………………………………………………………42 Fig. 48 – Continuous controller in the control cabinet ……………………………………………………………………………42 Fig. 49 – Technical drawing NKBD…/3.1 dimensions …………………………………………………………………………..45 Fig. 50 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control voltage ……………………46 Fig. 51 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control current ……………………47 Fig. 52 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control voltage ……………………48 Fig. 53 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control current ……………………49 Fig. 54 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 1-step on/off ……………50 Fig. 55 – 2x NKBD-6…42/3.1, 2x transformer, safety chain, status message, control 1-step on/off ……………51 Fig. 56 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 1-step on/off ……………52 Fig. 57 – 1x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 2-step on/off ……………53 Fig. 58 – 2x NKBD-6…42/3.1, 1x transformer, safety chain, status message, control 2-step on/off ……………54 Fig. 59 – Internal wiring NKBD-6…42/3.1 ……………………………………………………………………………………………55

List of tables
Tab. 11-1 – Assignment of power connection terminals ………………………………………………………………………. 21 Tab. 11-2 – Assignment of control connection terminals ……………………………………………………………………… 21 Tab. 11-3 – Assignment of D-SUB socket………………………………………………………………………………………….. 22 Tab. 11-4 – Status messages operation / error…………………………………………………………………………………… 22 Tab. 11-5 – Thresholds analog input…………………………………………………………………………………………………. 23 Tab. 12-1 – Default settings PCB AIRWIN 3.1……………………………………………………………………………………. 27 Tab. 12-2 – Status messages – System States …………………………………………………………………………………… 31 Tab. 12-3 – Troubleshooting checklist ………………………………………………………………………………………………. 33 Tab. 16-1 – Technical Specifications ………………………………………………………………………………………………… 44 Tab. 16-2 – Safety devices………………………………………………………………………………………………………………. 44 Tab. 16-3 – Operation conditions ……………………………………………………………………………………………………… 44 Tab. 17-1 – Dimensions and weights ………………………………………………………………………………………………… 45

[MBA_NKBD-3.1_EN] Rev.: 05/2023 Translation of the original instructions

References

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AIRWIN Ultrasonic Duct Humidifier

Product Information

Specifications

Product Usage Instructions

1. General Information and Intended Use

2. Safety Instructions

3. Scope of Delivery

FAQ

Q: What should I do if the humidifier is not producing enough

References

Read User Manual Online (PDF format)

Download This Manual (PDF format)

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