FläktGroup MultiMAXX Vent VX Operating instructions

Brand: FläktGroup

Model: MultiMAXX Vent VX

Type: Operating instructions

MAXX

Vent

OPERATION MANUAL

MAXX Vent VX

2FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications

FläktGroup Product Range

MAXX Vent VX

FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications 3

Unit Type Code

MAXX Vent Accessories

VX1K.U1 2KOB.JKD ZHX.XX X X

Model size

1 = Model size 1

2 = Model size 2

3 = Model size 3

4 = Model size 4

Heat exchanger

K = No heat exchanger

Air flow function

U = Recirculating air unit

M = Mixed air unit

Contact protection

1 = With contact protection

(discharge)

Thermostat

Without thermostat

Coil connection (front view)

K = No heat exchanger

Heat exchanger connection

O = Without screw thread connection

Outlet

B = Basic discharge, wall

V = Four sides discharge, ceiling

K = Flange

L = Double deflection louvre, ceiling/wall, only heating

P = Profile ceiling/wall

A = Discharge nozzle ceiling

T = Gate nozzle

Z = Basic ceiling two sides

O = Without outlet

Intake modules

20 = Mixed air module, type 1

21 = Mixed air module, type 2

23 = Fresh air shut-off damper

25 = Flexible canvas connections

26 = Rectangular duct 150

27 = Rectangular duct 1000

28 = Duct connecting bend 90°, symmetrical

29 = Duct connecting bend 90°, assymetrical

31 = Air intake hood, wall

32 = Weather protection grille

34 = Duct through slanted roof

35 = Air intake hood, roof

36 = Bag filter module

38 = Space bag filter for 35xx

39 = Space bag filter for 36xx

49 = Duct through roof with flat roof plinth

51 = Frame for wall connection

52 = Flange (for recirculating air units)

Without outlet

Motor, speeds

J = 3x400 V 2-speed - high speed range -

II 2G Ex h IIB T4/T3 Gb

L = 3x500 V 2-speed - high speed range -

II 2G Ex h IIB T4/T3 Gb

Only model size 2 and:

M = 3x400V 1-speed - low air volume - II 2G Ex h IIB+H2 T4/T3 Gb

N = 3x400V 1-speed - high air volume - II 2G Ex h IIB+H2 T4/T3 Gb

O = 3x500V 1-speed - low air volume - II 2G Ex h IIB+H2 T4/T3 Gb

P = 3x500V 1-speed - high air volume -II 2G Ex h IIB+H2 T4/T3 Gb

Electric equipment

K=Terminal box

S = Fan isolator

Design

D = Industrial configuration RAL 7000

E = Complete unit in stainless steel industrial configuration

Model size

1 = Model size 1

2 = Model size 2

3 = Model size 3

4 = Model size 4

Material/Design

4 = Galvanized steel/EExd configuration

5 = Stainless steel/EExd configuration

Actuators for louvers and mixed air modules

0 = without

1 = Manual adjustment

8 = Actuator 230 V - Zone 1

Filter class / electrical equipment

0 = without

5 = with Filter

Additional modules and suspensions

53 = Compact C Wall

55 = Modular (for wall mounting)

56 = Ceiling suspension

Model 55 Modular suspension with types

0 = without accessories 7 = 25+23+51

1 = 25+20+51 8 = 25+36+23+51

2 = 25+36+20+51 A = 26+36

4 = 25+21+29+51 C = 25+28 (+49...)

5 = 25+36+21+29+51 W = without accessories for units with

vertical discharge

Configuration 56 ceiling suspension

0 = Mounting kit without threaded rod

1 = Mounting kit with threaded rod 1 m

2 = Mounting kit with threaded rod 2 m

3 = Mounting kit with threaded rod 3 m

MAXX Vent VX

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Table of Contents

FläktGroup Product Range ......................................................................... 2

Unit Type Code ............................................................................................ 3

Table of Contents ........................................................................................ 4

1 Safety and User Information .................................................................... 5

1.1 Scope of the operation manual .................................................................... 5

1.2 Used symbols ............................................................................................... 5

1.3 Safety-conscious working ............................................................................ 6

1.4 Proper use .................................................................................................... 7

1.5 Safety regulations and codes ....................................................................... 7

1.6 Modifications and changes ........................................................................... 7

1.7 Spare parts ................................................................................................... 7

1.8 Personnel selection and qualification ........................................................... 7

2 Technical Description .............................................................................. 8

2.1 Basic unit components ................................................................................. 8

2.2 Material specification .................................................................................... 8

2.3 Unit components .......................................................................................... 9

2.4 Unit dimensions ............................................................................................ 9

2.5 Unit weight ................................................................................................. 10

2.6 Unit operating limits .................................................................................... 10

2.7 Sound and electric data ............................................................................. 11

3 Shipping and Handling .......................................................................... 13

3.1 Shipping ..................................................................................................... 13

3.2 Shipping and handling of unit ..................................................................... 13

3.3 Storage ....................................................................................................... 13

4 Assembly ................................................................................................. 14

4.1 Load-bearing capacity of the installation site ............................................. 14

4.2 Ceiling installation ...................................................................................... 14

4.3 Wall installation .......................................................................................... 15

4.4 Unit installation ........................................................................................... 16

5 Electrical Connection ............................................................................. 18

5.1 Wiring diagrams ......................................................................................... 18

5.2 Terminal box/fan isolator ............................................................................ 18

5.3 Motor terminal diagram for 2-speed three-phase external rotor motor

- II 2G Ex h IIB T4/T3 Gb (motor model J, L) ................................................... 19

5.4 Motor terminal diagram for 1-speed three-phase standard motor 3 x 400 V

(3 x 500 V) - II 2G Ex h IIB+H2 T4/T3 Gb (motor model M, N, O, P) ............... 21

5.5 Connection of damper actuator .................................................................. 23

5.6 Installing control unit and connecting unit .................................................. 24

6 Commissioning ...................................................................................... 26

6.1 Per-commissioning requirements ............................................................... 26

6.2 Operation ................................................................................................... 26

6.3 Operating instructions ................................................................................ 27

6.4 Deactivation ............................................................................................... 27

7 Maintenance ............................................................................................ 28

7.1 Maintenance ............................................................................................... 28

7.2 Quarterly maintenance ............................................................................... 29

7.3 Half-yearly maintenance ............................................................................ 30

7.4 Troubleshooting ......................................................................................... 31

8 Disassembly and Disposal .................................................................... 32

8.1 Dismantling ................................................................................................ 32

8.2 Recycling .................................................................................................... 32

Appendix to the Operation, Installation and Maintenance Manual and

Data&Facts Catalogue .............................................................................. 33

Declaration of Conformity ..........................................................................34

Disclosing, copying, distributing or taking any action in reliance on the contents of this document is strictly

prohibited without express prior consent. Violations entail liability for any damages or other liability arising.

All rights in relation to patents, utility patents or design patents are reserved.

MAXX Vent VX

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1 Safety and User Information

This is an original operation manual verified by the manufacturer.

The MultiMAXX Vent VX unit heaters are developed and manufactured in accordance

with the state-of-the-art technological standards and established technical safety

codes and meet the requirements of the EC Directive on Machinery.

MultiMAXX Vent VX unit heaters are highly reliable in operation and meet strict quality

standards. This product range combines future-oriented technology with a high level of

user friendliness and ease of maintenance.

However, unit heaters could pose unavoidable residual risk of injury or risk of equip-

ment or property-damage only accidents. Therefore your personal safety and the

proper operation of the unit depend on the strict observance of the safety instructions.

Failure to follow the safety precautions could result in death, serious injury or equip-

ment or property-damage-only accidents.

Observing the safety instructions in the current operation manual will help avoid the

risks, ensure economical operation of the unit and enjoy full benefits of the product.

The safety aspects covered by this chapter are valid for the entire operation manual.

1.1 Scope of the operation manual

This operation manual covers critical points on the following subjects:

– Shipping

– Assembly

– Installation

– Electrical connection

– Commissioning

–Operation

– Maintenance, cleaning and disposal

1.2 Used symbols

The following symbols are used to highlight specific text sections in this operation

manual:

– Indicates text paragraphs

•Indicates work steps

Indicates work results.

NOTE!

Refer to this section for additional information on energy-efficient operation of the

MultiMAXX Vent VX unit heater.

RECYCLING!

This symbol clarifies proper procedure for recycling of package material and disused

unit components. These components need to be separated according to their

features and material type.

MAXX Vent VX

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The following designations and symbols are used for specifying safety instructions.

1.3 Safety-conscious working

Observe the following instructions during installation, settings, service and mainte-

nance tasks:

RISK OF ACCIDENT DUE TO ELECTRICAL CURRENT!

This symbol indicates a risk of accident due to electric shock.

PERSONAL INJURY!

This section specifies procedures and precautions for preventing personal injury.

DANGER DUE OVERHEAD LOADS!

This symbol warns about personal injury and damage caused by overhead loads.

DANGER – SHARP CUTTING EDGES!

This section specifies procedures and precautions for preventing personal injury

resulting from cuts on thin metal fins.

DANGER OF ROTATING UNIT PARTS!

This section specifies procedures and precautions for preventing personal injury

resulting from rotating unit components.

ENVIRONMENTAL DAMAGE!

This symbol warns about damage to the environment and turns attention to all

existing national environmental protection regulations.

EQUIPMENT DAMAGE!

This section specifies procedures and precautions for preventing damage to the

MultiMAXX Vent VX unit heater.

ELECTRICAL HAZARD!

Disconnect all electric power of the unit and ensure the power cannot be inadvert-

ently energised, earth, short-circuit and block off all neighbouring live parts. Non-

compliance can lead to death or serious injury.

DAMAGE RISK DUE TO STATIC DISCHARGE!

While carrying out connections or adjustments on the MultiMAXX Vent VX unit

heater make sure that you discharge yourself statically before touching PC boards

and electrical components.

•Fluctuations and imbalance in supply voltage must not exceed tolerance limits

specified on the unit identification plate; otherwise this could cause severe unit

malfunction, overload states or failure.

MAXX Vent VX

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1.4 Proper use

The MultiMAXX Vent VX unit heaters are designed for heating, ventilating and filtering

of indoor and outdoor air in industrial buildings within explosion risk area of zone 1. Unit

configuration is labelled as II 2G Ex h IIB T4/T3 Gb (EN 14986 ed.2, EN ISO 80079-36,

EN ISO 80079-37, EN IEC 60079-0 ed.5, EN 60079-7 ed.3) and

II 2G Ex h IIB+H

T4/T3 Gb (

EN 14986 ed.2, EN ISO 80079-36, EN 13463-3,

EN IEC 60079-0 ed.5, EN 60079-1 ed.3).. Filters, mixed air and air intake modules,

suspension sets, control units and control devices can be supplied as optional acces-

sories.

Proper use also stipulates the observance of the current operation manual as well as

adherence to all inspection and maintenance intervals specified by FläktGroup.

Improper use Any use other than that described above is considered improper. The manufacturer/

supplier is not liable for any damages arising from improper use. The user alone bears

the risk.

1.5 Safety regulations and codes

When carrying out installation, commissioning, maintenance and service of the

MultiMAXX Vent VX unit heaters, all relevant safety regulations and codes as well as

generally established technical practices must be followed.

1.6 Modifications and changes

It is not allowed to modify, add components, or convert the MultiMAXX Vent VX in any

way.

Changes or modifications of the unit heater shall invalidate the CE conformity and ren-

der and all warranty claims as null and void.

1.7 Spare parts

Only original FläktGroup spare parts are allowed, since FläktGroup is not liable if third-

party spare parts are used.

1.8 Personnel selection and qualification

PERSONAL INJURY!

The MultiMAXX Vent VX unit heaters must not be operated:

– in rooms with high dust or moisture content

– in rooms with strong electromagnetic fields

– in rooms with aggressive environment that may attack plastics.

The following accident prevention regulations are valid (VBG1, BGV A2 (previously:

VBG4), VBG7w, VBG9a) and generally recognized codes for machinery and princi-

ples of engineering, in particular DIN VDE 0100, DIN VDE 0105.

NOTE!

Every person authorised to work with the MultiMAXX Vent VX unit must have read

the entire operation manual and understood it completely. Please read this document

fully before commencing any work, and not while performing a task.

Electrical connection shall only be carried out by qualified licensed staff or other

individuals with proper professional training and experience in the following areas:

– Regulations concerning health and safety in the workplace

– Accident prevention regulations

– Directives and recognized codes of practice

All skilled individuals shall be able to assess, what the work entrusted to them entails,

and shall be able to recognize and avoid all associated dangers.

MAXX Vent VX

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2 Technical Description

2.1 Basic unit components

2.2 Material specification

Fig. 2-1: Components of MultiMAXX Vent VX basic unit

Poz. 1a: Fan with contact protection grille - II 2G Ex h IIB T4/T3 Gb

Poz. 1b: Fan with contact protection grille - II 2G Ex h IIB+H2 T4/T3 Gb

Poz. 2: Flange for accessories on the intake side

Poz.:3: Fan with contact protection grille

Poz.:4: Unit casing

Poz.:5: Discharge - „B“ basic wall

Poz.:6: Terminal box/fan isolator

Unit part Material

Fan with contact protection grille Various materials

Intake nozzle Galvanized sheet steel or galvanized sheet steel with paint finish

Fan module Galvanized metal sheet or stainless steel

Unit casing Galvanized and painted metal sheet or stainless steel

Outlet Galvanized sheet steel or stainless steel or aluminium fins and galvanized

sheet steel or aluminium fins and stainless steel

Terminal box / fan isolator Various materials

Tab. 2-1: Material specification of unit components

MAXX Vent VX

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2.3 Unit components MultiMAXX Vent VX unit heater is comprised of a fan. The casing is performed in

galvanized and painted metal sheet or stainless steel. The air discharge opening can

accommodate up to 12 different types of discharge louvres. A wide wing or sickle blade

fan is located in the fan casing on the rear side of the unit heater. The protection grille

prevents possible contact with the fan.

The unit rear side can be supplied with an attachment for mounting air intake accesso-

ries. The components that are made of non-ferrous metal and galvanized fixing parts

are not protected by paint.

M8 nuts are riveted on the sides of the fan section (4 on each side) and are used to

secure the unit with brackets or suspensions on the wall or under the ceiling.

2.4 Unit dimensions

Fig. 2-2: Unit heater dimensions

Tab. 2-2: Unit dimensions

Minimum clearance for installation and maintenance

Dimensions / unit size 1 2 3 4

A [mm] 642 738 866 1026

B [mm] 520 616 744 904

C [mm] 387 387 387 452

E (for motor J, L) [mm] 120 120 140 140

E (for motor M, N, O, P) [mm] - 223 - 250

G [mm] 418 514 642 802

H [mm] 451 547 675 835

I [mm] 300 300 400 400

M [mm] 470 566 694 854

MAXX Vent VX

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2.5 Unit weight

Tab. 2-3: Weight including basic discharge

2.6 Unit operating limits

Unit Max. allowed ambient temperature -20°C to +40°C

Operating voltage 3 x 400 V or 1 x 500 V ~ 50 Hz

Protection class IP 54

Max. relative air humidity 95% at 25°C

Corrosion resistance class C3 - EN ISO 12944-2

Max. dust concentration in the air 10 mg / m3

Power consumption refer to unit identification plate

Unit size Weight [kg]

Motor type J, L Motor type M, N, O, P

VX 1 30 -

VX 2 38 46

VX 3 53 –

VX 4 79 79

NOTE!

All other important data about unit capacity, weights, connections and sound power

is specified in the „Data and Facts MultiMAXX Vent VN, VS, VX".

MAXX Vent VX

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2.7 Sound and electric data

Size

Speed Sound power level [dB] A-rated sum level Max.

power

consump-

tion

Max.

current

consump-

tion

Octave centre frequency [Hz] Sound power

dB(A)

Sound

pressure*

dB(A)

Speed RPM 63 125 250 500 1000 2000 4000 8000

II 2G Ex h IIB T4/T3 Gb - Motor J (3 x 400 V)

121420 54 64 70 65 67 65 61 54 71 55 0.14 0.48

11230 58 69 65 61 62 61 57 48 67 51 0.12 0.28

221390 62 74 76 69 69 69 66 59 75 59 0.29 0.80

11130 64 65 97 64 65 65 61 54 70 54 0.23 0.46

32910 79 67 73 68 67 67 64 56 73 57 0.31 0.87

1730 62 70 65 62 63 63 59 50 69 52 0.23 0.50

42890 78 75 85 74 73 70 67 60 80 63 0.44 0.99

1690 67 84 73 73 68 66 62 55 75 59 0.32 0.57

II 2G Ex h IIB T4/T3 Gb - Motor L (3 x 500 V)

121440 54 64 70 65 67 65 61 54 71 55 0.17 0.48

11290 58 69 65 61 62 61 57 48 67 51 0.12 0.28

221400 62 74 76 69 69 69 66 59 75 59 0.33 0.64

11130 64 65 67 64 65 65 61 54 70 54 0.25 0.37

32900 79 67 73 68 67 67 64 56 73 57 0.33 0.71

1730 62 70 65 62 63 63 59 50 69 52 0.24 0.41

42870 78 75 85 74 73 70 67 60 80 63 0.50 0.80

1660 67 84 73 73 68 66 62 55 75 59 0.34 0.46

II 2G Ex h IIB+H2T4/T3 Gb - Motor M (3 x 400 V)

2 1 930 63 59 68 61 61 58 53 43 66 49 0.18 0.64

4 1 680 72 77 76 71 65 61 56 49 73 56 0.18 0.71

II 2G Ex h IIB+H2T4/T3 Gb - Motor O (3 x 500 V)

2 1 930 63 59 68 61 61 58 53 43 66 49 0.18 0.52

4 1 680 72 77 76 71 65 61 56 49 73 56 0.18 0.53

II 2G Ex h IIB+H2T4/T3 Gb - Motor N (3 x 400 V)

2 1 1370 81 78 78 70 66 61 56 50 73 57 0.25 0.65

4 1 925 82 84 84 79 73 69 64 58 81 64 0.37 1.10

II 2G Ex h IIB+H2T4/T3 Gb - Motor P (3 x 500 V)

2 1 1370 81 78 78 70 66 61 56 50 73 57 0.25 0.55

4 1 925 8284847973696458 81 64 0.37 0.93

Tab. 2-4: Sound and electric data

* Sound pressure: standard values at 5 m distance to the unit side, at maximum air flow rate and low reflection room. Industrial

hall volume 1500 m3, absorption surface 200 m2 Sabin, hemispherical radiation = direction coefficient 2. These values can be

significantly influenced by the indoor characteristics in a positive or negative way.

MAXX Vent VX

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2.8 Air side accessories

The following accessories are available for the MultiMAXX Vent VX unit heater.

The symbol „x“ is reserved for size to be specified.

The symbol "#" means 4 = galvanized metal sheet or 5 = stainless steel

* Unit type code for mixed air modules and fresh air blocking damper depending

on the actuator:

ZHx.2xx0 - with field actuator provided by others (shaft diameter = 15.5 mm)

ZHx.2xx1 - manual adjustment

ZHx.2xx8 - with actuator 230 V - Zone 1

Description Order-Nr. Design

Mixed air module, type 1* ZHx.20#X Recirculating and outside air offset by 90°

Mixed air module, type 2* ZHx.21#X Recirculating and outside air opposite at 180°

Blocking damper outside air* ZHx.23#X Galvanized metal sheet or stainless steel

Flexible canvas connections ZHx.2520

ZHx.2530

ZHx.2540

ZHx.2550

Frame made of galvanized metal sheet, overall length 150 mm

Frame made of stainless steel, overall length 150 mm

Frame made of galvanized metal sheet, overall length 300 mm

Frame made of stainless steel, overall length 300 mm

Rectangular duct 150 ZHx.26#0 Spacer, overall length 150 mm

Rectangular duct 1000 ZHx.27#0 Overall length 1000 [mm]

Duct connecting bend 90°,

symmetrical ZHx.28#0 90° symmetrical, tapered peripheral run-around mounting frame

Duct connecting bend 90°,

asymmetrical ZHx.29#0 90° asymmetrical, tapered peripheral run-around mounting

frame

Air intake hood, wall ZHx.3140 Galvanized metal sheet

Weather protection grille ZHx.3240 Galvanized metal sheet, overall depth 45 mm

Duct through slanted roof ZHx.3440 Galvanized metal sheet

Air intake hood, roof ZHx.3540

ZHx.3545

Metal sheet in RAL 9002 with bird protection grille, without filter

Metal sheet in RAL 9002 with bird protection grille, with M5 filter

Bag filter for roof air intake hood

ZHx.3845 M5 filter

Bag filter module ZHx.3640

ZHx.3645 Without filter unit

With M5 filter

Bag filter for module „36“ ZHx.3945 M5 filter

Duct through roof with flat roof plinth

ZHx.4940 Galvanized metal sheet

Frame for wall connection ZHx.51#0 As spacer for wall opening

Flange ZHx.52#0 Only for recirculating air units

Suspension type compact C ZHx.53#0 For recirculating air units

Modular type suspension ZHx.55#0 Only wall mounting

Ceiling suspension ZHx.56#0

ZHx.56#1

ZHx.56#2

ZHx.56#3

Installation without threaded rod

Threaded rod 1 m - M10

Threaded rod 2 m - M10

Threaded rod 3 m - M10

Tab. 2-5: Air side accessories

MAXX Vent VX

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3 Shipping and Handling

3.1 Shipping Manufacturer’s instructions regarding transporting and storing the unit must be

followed (see labels on the packing).

3.2 Shipping and handling of unit

•Attach lifting gear to the designated points of the assembly unit. Chains/slings

should not be knotted and/or be exposed to sharp edges. Special attention must be

given to equal weight distribution.

Only lifting gear with sufficient load carrying capacity is allowed.

Fig. 3-1: Transport of unit

3.3 Storage The MultiMAXX Vent VX unit heater must be protected from humidity and dirt. Store

the unit in rooms that meet IE 12 standards and EN IEC 60721-3-1 ed. 2 requirements.

NOTE!

•

When the unit heater is delivered and unpacked, check that the delivery is correct

according to the despatch note, and also check for completeness and transit damage.

•

Ship and store unit heaters in original packing!

EQUIPMENT DAMAGE!

•After the shipment ensure that the unit is not damaged.

NOTE!

Claims for damage or missing parts can only be filed with the insurance company only if

shipping damage is confirmed by an authorized worker of the transportation company.

DANGER DUE OVERHEAD LOADS!

Do not raise units overhead with personnel below units.

PERSONAL INJURY!

Do not use damaged transport devices.

Use a fork lift truck only if the unit is placed on a pallet.

DANGER – SHARP CUTTING EDGES!

Use personal protective equipment such as safety gloves, footwear and clothes for

unit shipping.

NOTE!

Allowed storing conditions:

Air temperature: -25 °C to +40 °C

Air humidity: from 50 to 85% relative air humidity, without condensation

MAXX Vent VX

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4 Assembly

4.1 Load-bearing capacity of the installation site

4.2 Ceiling installation

During planning give special attention to: the suspension height, distance

between the units and minimum distance from the ceiling.

Minimum distance from ceiling A (refer to Fig. 4-1)

It is necessary to keep the minimum distance to allow sufficient air intake and provide

sufficient access for maintenance.

The ceiling installation of recirculating air units with „ceiling“ suspension (ZH#.56xx)

refer to Fig. 4-5 and of mixed air units - Fig. 4-6.

NOTE!

The assembly site must be vibration-free and suitable for permanently supporting the

weight of the unit heater. If necessary, the approval of a structural engineer or

architect has to be received.

For mounting the unit, 2 sets with 4 M10 nuts are placed on the fan module

(refer to Fig. 2-2). The fixing material is enclosed with suspensions.

Table with suspension height of unit for

ceiling mounting

Fig. 4-1: Suspension height for ceiling

installation

Suspension height

Type Air throw Suspension

height max. (m)

(outlet C, D)

(m)

VX 1 20.6 14.2

VX 2 26.4 18.1

VX 3 31.8 21.4

VX 4 42.1 29.6

PERSONAL INJURY!

The minimum allowed mounting height above the floor amounts to 2.7 m.

NOTE!

The maximum height of the unit ceiling installation varies depending on the

discharge temperature, reduced speed and air volume flow due to accessories.

Model size 1 2 3 4

Clearance A

(mm) 300 300 400 400

MAXX Vent VX

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4.3 Wall installation

Give special attention to minimum height, direction of discharged air flow, distance

between units and minimum distance from the wall. (refer to Fig. 4-2).

Direction of discharged air flow

Discharge air flow should be directed as to avoid air draughts in the room. The primary

air flow must not be directed against walls, beams, cranes, shelves, columns or similar

obstacles!

Minimum distance to wall A (refer to Fig. 4-2)

Provide minimum distance to wall to allow sufficient air circulation and ensure ade-

quate access for maintenance.

For wall mounting of a recirculating air unit with „Modular“ suspension (ZH#.55xx) refer

to Fig. 4-3, with "Compact C" suspension (ZH#.53xx) refer to Fig. 4-4 and wall mount-

ing of mixed air units with "Modular" suspension refer to Fig. 4-7.

PERSONAL INJURY!

The minimum allowed mounting height above the floor amounts to 2.7 m.

NOTE!

Wall mounted unit heaters must not be mounted too high above the floor in order to

ensure good mixing of bottom air layers.

Model size 1 2 3 4

Clearance A (mm) 300 300 400 400

Air throw

Air throws are specified in the following table:

Fig. 4-2: Air throws with wall mounting

Max. air throw

Type Max. air throw

(m)

VX 1 20.6

VX 2 26.4

VX 3 31.8

VX 4 42.1

MAXX Vent VX

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4.4 Unit installation NOTE!

Units must be installed in a safe, reliable and visually adequate manner. For these

reasons, it is recommended to use manufacturer’s suspensions.

EQUIPMENT DAMAGE!

The unit must be installed in a stain-free, vibration-free and twist-free way.

NOTE!

Fixation points: unit heater must be secured at minimum 4 fixation points. Use the

screws of the transport safety device.

Fig. 4-3: Wall mounting of a recirculating air unit with „Modu-

lar“ suspension (ZH#.55xx) Fig. 4-5: Ceiling mounting of a recirculating air unit with „ceil-

ing“ suspension (ZHx.57xx)

Fig. 4-4: Wall mounting of a recirculating air unit with

Compact C suspension (ZH#.53 xx)

MAXX Vent VX

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Fig. 4-6: Ceiling mounting of a mixed air unit with „ceiling“ suspension (ZH#.56xx)

Fig. 4-7: Wall mounting of a mixed air unit with „Modular“ suspension (ZH#.55xx)

With mixed air units the flange for mounting accessories is fitted by the manufacturer;

with recirculating air units the flange (ZH#.5200) must be ordered as an accessory and

fitted by others on site.

Either flexible canvas connection (ZH#.25xx) or rectangular duct 150 (ZH#.26xx) must

be fitted as the first add-on module of a recirculating air unit. Refer to mounting exam-

ples in Fig. 4-6 and Fig. 4-7.

ZH#.35 xx

ZH#.49 xx

ZH#.20 xx

ZH#.36 xx

ZH#.25 xx, or

ZH#.26 xx

ZH#.56 xx

ZH#.31 xx

ZH#.51 xx

ZH#.29 xx

ZH#.55x5

ZH#.21 xx

ZH#.36 xx

ZH#.25 xx

MAXX Vent VX

18 FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications

5 Electrical Connection

5.1 Wiring diagrams

The electrical connection of MultiMAXX Vent VX unit heaters must be performed in

accordance with the valid wiring diagrams. The wiring diagram is located on the inside

cover of the unit connection box or is enclosed separately.

5.1.1 Cable connections

The cable connections must be performed in compliance with the local regulations and

code of practice.

The selection of cable type and cable cross section must be performed by a qualified

electrical engineer. Addition of components by others and field line runs must be

designed for high temperatures and fitted with spacers.

Electrically screened line shall be used for the PTC thermistor, whereas earth screen

shall be connected on one side to the protective conductor terminal (PE) in the control

unit. The decision to attach earth screen at both ends must only be made on site (e.g.

in case of severe interference), whereby the relevant applicable local regulations and

codes must be observed.

After successful cable installation all cable entry points must be sealed in a

splash-proof manner.

5.1.2 Motor protection using PTC thermistor

The PTC thermistors are embedded in motor windings and in combination with the

motor full protection of the control unit (986810, 986920 or 986960) enable interlocking

disconnection of the fan motor, if the maximum allowed winding temperature is

exceeded. If the unit heater is not operated together with the control unit, the motor

must be protected by a tripping unit of class Ex II (2) G or a tripping unit for Exe fan

motors of type: 912MVS.EX (producer: FläktGroup) or for Exd fan motor type

3RN 1011-1CK00 (producer: Siemens).

5.1.3 Operation of basic unit

For operating the unit heaters - switch units for recirculating and mixed air units can be

used (refer to Fig. on page 24-25). Operation with frequency converters or switch units

with voltage reduction (e.g. transformer) is not possible.

5.2 Terminal box/fan isolator

The

MultiMAXX

Vent VX unit heater is supplied with a plastic terminal box or fan

isolator.

HAZARDOUS VOLTAGE!

The electrical connection of the MultiMAXX Vent VX unit heater must only be

performed by qualified licensed staff in observance of the given operation manual

and the following regulations:

– VDE regulations, including safety regulations

– Accident prevention regulations

– Installation instructions.

HAZARDOUS VOLTAGE!

The wiring diagrams do not contain any protective measures. During connection cur-

rently valid standards and regulations must be observed and checked with the local

power company.

MAXX Vent VX

FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications 19

Fig. 5-1: Terminal box and earth terminal

The plastic terminal box / fan isolator contains a terminal strip. Electrical connection of

the unit heater and control unit must be carried out according to the current

EN 60079-14 ed.4 standard and terminal diagrams with consideration of all necessary

protective measures.

5.2.1 Potential equalisation

Electrical conductive connection must be assured between all units and accessory

parts. Thermistors and overload protection must be activated. Besides, the unit heater

must be integrated in potential equalisation using the designated connection point. The

earthing must be continuously ensured. The resistance must not exceed max. 0.1 Ohm

(refer to Fig. 5-1). The potential equalisation between accessory parts must be

performed using enclosed screws, nuts and tooth lock washers.

5.3 Motor terminal diagram for 2-speed three-phase external rotor motor

- II 2G Ex h IIB T4/T3 Gb (motor model J, L)

– With PTC thermistor

– Winding diagrams /Y

– Without voltage switch-over!

– For operating voltage refer to the unit identification plate

5.3.1 1-speed operation at operating voltage 3 x 400 V (3 x 500 V) - unit with terminal box (K)

– Connection cable: 3 + PE = 4 wires

– Electrically screened line: 2 K connecting wires

Fig. 5-2: Terminal drawing for 1-speed operation - unit with terminal box (K)

Earth terminal

1-speed operation with high RPM (D)

1-speed operation with low RPM (Y)

Terminal box

MAXX Vent VX

20 FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications

5.3.2 2-speed operation at operating voltage 3 x 400 V (3 x 500 V) - unit with terminal box (K) and Control unit

– with speed switch unit 986920.3 or 986960.3 for 3 x 400 V (motor J), 986820T.51

or 986860T.51 for 3 x 500 V (motor L)

– Connection cable: 6 + PE = 7 wires

– Electrically screened line: 2 K connecting wires

Fig. 5-3: Terminal drawing for 2-speed operation using two-speed switch

5.3.3 1-speed operation at operating voltage 3 x 400 V (3 x 500 V) - unit with fan isolator (S)

– Connection cable: 3 + PE = 4 wires

– Electrically screened line: 2 PTC thermistor connecting wires

Fig. 5-4: Connecting 1-speed fan isolator (S)

Control unit

for 400 V: type 986820.3 or 986960.3

for 500 V: type 986820T.51 or 986860T.51)

Terminal box

1-speed operation with high RPM ()

1-speed operation with low RPM (Y)

Fan isolator

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FläktGroup MultiMAXX Vent VX Operating instructions

FläktGroup MultiMAXX Vent VX Operating instructions

FläktGroup MultiMAXX Vent VX Operating instructions

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