MAXX
Vent
VX
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
2=
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
Copyright note
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
FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications 5
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
FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications 7
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
2
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
1a
1b
2
63
4
5
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
kW
Max.
current
consump-
tion
A
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
FläktGroup DC-2009-0132-GB 2020-02/R5 • Subject to modifications 13
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#.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)
or
Terminal box
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)
or
Fan isolator
Fan isolator
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