FläktGroup MULTIMAXX HG User manual

MULTIMAXX
®
HG
OPERATION MANUAL

MultiMAXX HG
2FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
Product range

MultiMAXX HG
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications3
Unit Type Code
MultiMAXX Controls Accessories
Suspensions
53 = Compact C
54 = Studio (for wall configuration)
55 = Modular (for wall configuration)
56 = Ceiling suspension
HG2 4.U E F T C B.AMD OSHG 0.EC0M ZH#.####
Model size
2 = Model size 2
4 = Model size 4
Capacity stage
4 = Low capacity
5 = High capacity
Unit model
U = Recirculating-air mode
M = Mixed air unit
Heating medium
E = Natural gas (EG),
Propane-butane (LPG)
Coil
F= High-temperature resistant steel
Control of thermal output
P = Control of supply-air temperature
(only with mixed-air units)
T = Control of room temperature
Unit model
B = Non-room-sealed firing
C = Room-sealed firing
Outlet
A = Outlet nozzle, ceiling
B = Basis - wall
C = SAL, ceiling, manually adjustable
D = Motorized SAL, ceiling, (230 V, Open/Close)
K = Blank flange on discharge side
L = Air deflection louvre
P = Profile outlet
T = Gate nozzle
U = SAL, wall installation, manual adjustment
V = Four sides, ceiling
W = Motorized SAL, wall, (230 V, Open/Close)
Z = Two-side basic ceiling outlet
O = Without louvre
Air-side accessories
20 = Mixed-air module, type 1
21 = Mixed-air module, type 2
23 = Outdoor air blocking damper
25 = Flexible connection
26 = Rectangular duct 150
27 = Rectangular duct 1000
28 = Duct bend 90°
symmetrical
29 = Duct bend 90°
asymmetrical
31 = Wall air-intake hood
32 = External louvre
33 = Contact protection grille
34 = Duct through slanted roof
35 = Roof air-intake hood
36 = Bag filter module
37 = Mat filter module
38 = Spare filter for air intake hood, roof
39 = Spare filter for bag filter module
40 = Spare filter for mat filter module
49 = Duct through roof with flat roof plinth
51 = Frame for wall connection
52 = Flange (for recirculating-air units)
Ohne Auslass
Motor/speeds
AC motors
A = 3x400 V, 2-speed - low speed range, wide-blade fan, for
capacity stage (4)
B = 3x400 V, 2-speed - high speed range, wide-blade fan,
for capacity stage (5)
D=
1x230 V, 2-speed - low speed range, wide-blade fan, for
lower capacity stage (4) (only for size 2)
E = 1x230 V, 2-speed - high speed range, wide-blade fan,
for capacity stage (5)
R = 3x400 V, 2-speed – high speed range, sickle-blade fan,
for capacity stage (5) (only for size 4)
EC motors
Y=
1x230 V continuously variable EC - sickle-blade fan
Z = 3x400 V, continuously variable - sickle blade fan, for ca-
pacity size (5) (only for size 4)
Electric equipment
M = Multifunctional control
Unit casing
D = Heat exchanger casing in industrial design RAL 7000
Model size
2 = Model size 2
4 = Model size 4
Model/material
0 = Standard model
8 = Ecodesign (only for 25, 26, 36, 38, 39)
Actuators for louvers and mixed-air modules
0 = Actuator on site
1 = Manual
2 = Actuator 230 V, Open/Close
3 = Actuator 230 V, Open/Close + poti
4 = Actuator 230 V, Open/Close + final position switch
5 = Actuator 230 V + spring return
Filter grade/electric equipment
0 = Without filter, without differential pressure switch
2 = G2/without differential pressure switch
3=
G3/without differential pressure switch (only for ZH#.37)
4 = G4/without differential pressure switch
5 = G2/with differential pressure switch
6= G3/with differential pressure switch (only for ZH#.37)
7 = G4/with differential pressure switch
9 = F7/with differential pressure switch - for Ecodesign
Modular (ZH#.550#) with accessories
0=
without accessories 8 = 25+36+23+51
1 = 25+20+51 9 = 25+37+23+51
2 = 25+36+20+51 A = 26+36
3 = 25+37+20+51 B = 26+37
4 = 25+21+29+51 C = 25+28 (+49...)
5 = 25+36+21+29+51 E = Ecodesign
25(26)+36+20+51
6 = 25+37+21+29+51
7 = 25+23+51 W = without unit accessories with
vertical outlet
Suspension ceiling ( ZH#. 560 # )
0 = Without threaded rod
1 = Threaded rod 1 m
2 = Threaded rod 2 m
3 = Threaded rod 3 m
Control panel, control board
0.000M = Sheet steel casing
Multi
(motors D, E)
0.EC0M = Sheet steel casing
Multi
(drives A, B, R, Y, Z)
0.RDDO = Remote control control-
ler PCB RDDO

Table of Contents MultiMAXX HG
4FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
Unit Type Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1 Safety and User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Scope of application of the operation manual . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Icons used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Safety-conscious work procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.5 Safety regulations and codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.6 Modifications and changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.7 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.8 Selection and qualification of personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Unit configuration and packaged content . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Specification of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.5 Unit dimensions and minimum installation space . . . . . . . . . . . . . . . . . . . 12
2.6 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.7 Commission Regulation (EU) 2016/2281 from November 30, 2016 . . . . . 14
2.8 Air-side accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.9 Accessories - flue gas pipework, gas distribution . . . . . . . . . . . . . . . . . . . 16
3 Shipping and storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 Shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 Shipping and handling of the unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4 Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1 Load-bearing capacity of the installation site . . . . . . . . . . . . . . . . . . . . . . 20
4.2 Ceiling installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 On-wall mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Safety clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.5 Unit mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.6 Mounting the flue gas pipework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7 Mounting examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1 Electric switch cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.2 Connection diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.3 Multi Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.1 Gas distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7 Commissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.1 Initial commissioning - information for service companies . . . . . . . . . . . . 36

MultiMAXX HG Table of Contents
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications5
8 Operation of the Gas Unit Heater . . . . . . . . . . . . . . . . . . . . . . . . 50
8.1 General operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
8.2 Operation and adjustment of the units by means of the control
panel OSHG 0.EC0M (OSHG 0.000M) . . . . . . . . . . . . . . . . . . . . . . . . . . .50
8.3 Adjustment of the mixed-air module . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
8.4 Adjustment of the secondary-air louvre . . . . . . . . . . . . . . . . . . . . . . . . . . .59
8.5 Differential pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
8.6 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
9 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
9.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
9.2 Quarterly maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
9.3 Semi-annual maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
9.4 Annual maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
9.5 Breakdowns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
10 Disassembly and Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
10.1 Dismantling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
10.2 Recycling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
11 Warranty Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
11.1 Authorized service companies for warranty and repairs in Germany . . . .68
11.2 Warranty certificate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
– Original operation manual –
Copyright note
Disclosing, copying, distributing or taking any action in reliance on the contents of this document is strictly prohi-
bited 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.

Safety and User Information MultiMAXX HG
6FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
1 Safety and User Information
This is an original operation manual verified by the manufacturer.
MultiMAXX HG Air Heaters are developed and manufactured according to the current
state of technology and the approved safety-specific standards and directives and cor-
respond to the EC Directive on Machinery.
MultiMAXX HG Air Heaters are safe to operate and comply with high quality standards.
Future-oriented technology and pronounced operator and maintenance friendliness
were combined in this product series.
However, every unit heater can pose an unavoidable residual danger for the user or
third parties, or can lead to impairments of the units or other objects. For this reason,
it is important to observe the safety regulations without fail. The unit and its mainte-
nance must be carried out according to all prevailing regulations and standards.
Failure to follow the safety precautions could result in death, serious injury, environ-
mental damage and/or considerable property damage.
Observing the safety instructions in the current operation manual will help prevent
risks, ensure economical operation of the unit and let you enjoy the full benefits of the
product.
The safety aspects covered by this chapter are valid for the entire operation manual.
1.1 Scope of application of the operation manual
This operation manual provides critical information about the following:
–Shipping
– Mounting
– Installation
– Electrical connection
– Commissioning
–Operation
– Maintenance, cleaning and disposal
1.2 Icons used
The following icons are used to highlight specific text sections in this operation manual:
– Indicates text paragraphs
•Indicates process instructions
9Indicates work results
The following designations and icons are used in the operation manual for safety
instructions:
Notice!
Here you can find supplementary information on using the air heater
MultiMAXX HG and its economic handling.
Recycling!
This icon is used to highlight instructions on proper reuse of packaging material and
disused assembly groups (separated according to recyclable materials).
Danger of electrical current!
This icon indicates a risk of electrical shock that can result in serious injury, death
and material damage.
Risk of personal injury!
This icon indicates (different from the above-mentioned danger types) a hazardous
location with a risk of personal injury including death and material damage.

MultiMAXX HG Safety and User Information
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications7
1.3 Safety-conscious work procedures
Observe the following instructions during installation, configuration, repair and mainte-
nance tasks:
Fluctuations and imbalance in the mains supply voltage must not exceed tolerance lim-
its specified on the name plate; otherwise, this could cause severe unit malfunction,
overload states or failure.
Danger due to overhead loads!
This icon indicates a hazardous suspended load with a risk of personal injury includ-
ing death and material damage.
Danger of hot surfaces!
This section specifies procedures and precautions for preventing personal injury
resulting from contact with hot surfaces.
Danger of sharp cutting edges!
This section specifies procedures and precautions for preventing personal injury
resulting from cuts caused by sheet metal.
Risk of rotating components!
This symbol indicates hazardous rotating parts with a risk of personal injury includ-
ing death and material damage.
Environmental damage!
This icon warns about possible damage to the environment.
Danger of damage due to static discharge!
This icon precedes a warning of risks of damage to unit electronic components due
to static discharge.
Damage to the unit!
This icon indicates a hazardous location with a risk of material damage that can also
lead to personal injury.
Danger of accident due to gas explosion!
This section specifies particular information and prohibitions for avoiding personal
injury through gas explosions.
Danger of electrical current!
Disconnect the unit from the power supply and ensure the power cannot be inadver-
tently switched on, earth, short-circuit, and block off all neighboring live parts. Non-
compliance can lead to death or serious injury.
Risk of rotating components!
Danger of injury from rotating fan wheel! Before performing any work on the unit,
ensure that the unit is disconnected and powered down. Ensure that the unit is iso-
lated and secured against being energized at an appropriate point of the on-site
electrical power supply.
Danger of damage due to static discharge!
When connecting and/or adjustment work on the MultiMAXX air-handling unit, make
sure that you statically discharge yourself before touching PCBs and electrical com-
ponents.

Safety and User Information MultiMAXX HG
8FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
1.4 Proper use
The MultiMAXX air-handling units are used in industrial, warehouse, sales and exhibition
rooms, i.e., in areas which are protected against the influences of weather (including
mounting, temporary storage, and maintenance work). They serve for heating, ventilation
and filtration of the room/outdoor air.
In all areas which demand a room air-independent firing, the units are equipped with a
fresh-air supply (coaxial flue gas pipework can be optionally employed).
In all areas where there is the danger of negative pressure, it is absolutely necessary
to use units with a room-sealed model.
Filters, mixed-air modules, air intake plenums, mounting brackets, control units and control
elements can be supplied as accessories.
Proper use also includes observance of the operation manual and the maintenance and
care instructions prescribed 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
For mounting the electrical connection and gas connection, commissioning, repair and
maintenance work with MultiMAXX air-handling units, observe the respective safety
regulations and standards which are valid in the respective countries and generally
recognized rules of technology.
1.6 Modifications and changes
Do not attempt to modify, add components, or convert the GEA MultiMAXX unit heater
in any way.
Changes or modifications of the heating unit will invalidate the CE conformity and ren-
der all warranty claims as null and void.
1.7 Spare parts
You must only use original FläktGroup spare parts, as FläktGroup is not liable for dam-
age caused by the use of third-party spare parts. You must only use original Fläkt-
Group spare parts, as FläktGroup is not liable for damage caused by the use of third-
party spare parts.
1.8 Selection and qualification of personnel
Risk of personal injury!
It is not permitted to operate MultiMAXX air heaters:
– in areas subject to explosion risk
– in rooms with high dust or moisture content
– in rooms with strong electromagnetic fields
– in rooms with aggressive atmosphere
Notice!
Every person who works on the MultiMAXX unit heater must have completely read
and understood this entire operation manual.
Mounting/maintenance/repair may only be carried out by skilled staff observing
the valid regulations and standards.
Commissioning may only be carried out by specialists briefed in the prevailing
standards and regulations and who have installed the complete unit.
Electrical installation may only be carried out by skilled electricians observing the
valid regulations.
Gas installation may only be carried out by trained gas specialists observing the
valid regulations.
All skilled staff must be able to assess the work assigned to them, and recognize
and avoid all associated dangers.

MultiMAXX HG Specifications
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications9
2 Specifications
2.1 Unit configuration and packaged content
Fig. 2-1: Technical description MultiMAXX HG
Pos. 1a: Wide-blade fan (optional)
Pos. 1b: Sickle-blade fan (optional)
Pos. 2: Fan chamber with air inlet nozzle
Pos. 3: Electrical switch cabinet for Multi Operation (sheet steel)
Pos. 4: Coil
Pos. 5: Heat exchanger casing
Pos. 6: Reflection plates
Pos. 7: Flue pipe fitting on air-intake side
Pos. 8: Flue pipe fitting for smoke extract
Pos. 9: Gas burner
Pos. 10: Gas burner casing
Pos. 11: Outlet (optional)
Pos. 12: Thermal fuse
11
10
9
78
4
2
1b
1256
1a
3

Specifications MultiMAXX HG
10 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
Various unit parts indicated in Fig. 2-1 are specified in detail as follows.
Wide-blade fan (Pos. 1a)
Axial fan with external-rotor motor and integrated contact protection grille, aluminum
wide blade, balanced by the manufacturer, maintenance-free with moisture proof
motor wired ready for connection in the cable box.
Protection class IP 54, thermal class F, external thermal contact,
in 2 models 400 V, 50 Hz and 2 models 230 V, 50 Hz.
Sickle-blade fan (Pos. 1b)
Axial fan with with AC or EC external rotor motor and integrated contact protection
grille. Sickle blade, balanced by the manufacturer, maintenance-free with moisture-
proof motor and wired to the cable box.
Protection class IP 54 thermal class F, external thermal contact,
400 V, 50 Hz and 230 V, 50 Hz.
Fan chamber with air inlet nozzle (Pos. 2)
The fan chamber is made of galvanized sheet steel and equipped with 8 x M8 nut serts
for the suspension of the unit.
Electrical switch cabinet for control system (pos. 3)
Sheet steel cable box contains controller PCB with terminal strip.
Coil (Pos. 4)
The coil is simple and robust, furnished with a combustion chamber and integrated
retractions, thereby ensuring optimal heat transfer between the combustion chamber
and the air to be warmed. The coil is made of high-temperature resistant steel.
Heat exchanger casing (pos. 5)
The coil casing is assembled by the manufacturer and made of galvanized sheet steel,
painted in RAL 7000.
Gas burner (Pos. 9)
The fully automatic gas-pressure burner provides for the temperature rise in the coil.
The burner can be used for the following gas configurations: natural gas, gas propane-
butane, only propane, and only butane.
Outlet (Pos. 11)
The diffusers direct the heated air in the desired direction.
2.2 Specification of material
Unit part Material
Fan with contact protection grille Aluminum-metal mix + diverse materials
Ventilator chamber Galvanized sheet steel
Electrical box made of galvanized sheet steel + different materials
Coil High-temperature resistant steel
Unit casing made of varnished sheet steel RAL 7000
Outlet The frame is made of galvanized painted sheet steel or galvanized sheet steel. The
blades are made of galvanized sheet steel or aluminum profiles
Gas burner Aluminum-metal mix + diverse materials
Tab. 2-1: Specification of material

MultiMAXX HG Specifications
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications11
2.3 Functional description
The MultiMAXX HG Gas Air Heaters are produced in 2 model sizes with 2 capacity
stages each for wall or ceiling version. The basis of the unit is formed by a coil with a
robust combustion chamber and integrated retractions, assuring an optimal heat trans-
fer between the combustion chamber and the air to be warmed.
The coil is installed in a thin-walled high-temperature resistant steel casing (RAL
7000).
The 4 M8 nut serts on each side of the fan module are provided for
suspending the unit
on the ceiling or wall.
The rear side of the unit is equipped with an AC or EC axial fan with integrated contact
protection grille. The thermal contact is guided out and wired to the cable box. A flange
can be mounted on the fan module of the unit, which permits the connection of air-side
accessories.
A diffuser is mounted on the discharge side of the unit, ensuring the control of the direc-
tion of airflow and air throw of the warmed air compared to the position of the unit in
the room. The outlet is made of several selectable types (see type code on page 3)
The temperature rise of the coil is ensured by a fully automatic Premix burner. The
burner can process the following gases: natural gas, propane-butane gas, only pro-
pane and only butane.
2.4 Operating conditions
Operating temperature 0°C to +40°C
Operating voltage 3 x 400 V, or 1 x 230 V~ 50 Hz
Protection class IP 42 (according to EN 60 529)
Fan power consumption see name plate
Gas burner class: I2R - Natural gas (NG)
I3R - Propane-butane (PB), propane (P),
butane (B)
Class NOX : see Tab. 2-2
Variant types of the exhaust installation: B23, C53, C13, C23, C33 (as per EN 1020)
Gas burner Inlet pressure of the heating medium
- Natural gas and propane/butane: 3 +1 kPa
- Max. power consumption: approx. 150 W (see name plate)
- Operating voltage: 1 x 230 V~ 50 Hz
* During unit operation (burner operation), there is usually a drop in gas pressure as a result of
pressure losses in the pipeline. Even with such a waste, the fuel pressure must not be outside
the limit.
The MultiMAXX HG Air Heaters may only be operated under the conditions (except
temperature) described in Storage (chapter 3.3).
When operating the MultiMAXX HG heating units, it is essential to ensure adequate
ventilation of the area
Notice!
All other important data on dimensions, weights, connections, sound power etc. are
provided in the "Technical data MultiMAXX HG Air Heaters."
Unit type Concentration NOXClass NOX
ppm mg/kWh mg/m3
HG 24 15 - 22 28 - 40 28 - 41 5
HG 25 20 - 22 36 - 40 38 - 41 5
HG 44 25 - 27 45 - 50 47 - 53 5
HG 45 25 - 38 45 -70 47 - 73 4
Tab. 2-2: Specification of the NOXclass

Specifications MultiMAXX HG
12 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
2.5 Unit dimensions and minimum installation space
Fig. 2-2: Unit dimensions MultiMAXX HG
Tab. 2-3: Unit dimensions MultiMAXX HG
Minimum space for mounting and
maintenance
Connection of the unit to the gas mains by
means of
Accessories Article # ZHG.00#0 with internal
screw thread
R 3/4" (without accessories
External thread R 1/2"- inside the unit).
Size/unit model size 2 4
A [mm] 918 1206
B [mm] 701 954
C [mm] 340 370
D [mm] 80 100
E (for AC motor (A, B, D, E)) [mm] 81 112
E (for AC motor (R)) [mm] -66
E (for EC motor (Y)) [mm] 65 53
E (for EC motor (Z)) [mm] -53
F [mm] 110 75
G [mm] 514 802
H [mm] 300 400
P [mm] 222,5 288
R [mm] 126 195
S [mm] 352 424

MultiMAXX HG Specifications
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications13
2.6 Technical specifications
Tab. 2-4: Technical description
Type Thermal
output
range
Q
T
Speed Airflow
rate
V
L
Fan
Voltage
U
Max
Current
consump-
tion
I
Max
Power con-
sumption
P
Burner
voltage
U
Sound
power
Air throw
(Blinds
B)
Air throw
(Louvre
U, W)
Suspen-
sion height
(louvre
C, D)
Weight
with
burner
without
Louvre
[kW] [min-1][m
3/h] [V] [A] [kW] [V] [dB(A)] [m] [m] [m] [kg]
A - 3x400 V, AC motor, 2-stage (lower speed range)
HG24 15 ÷ 25 710 2395
3x400
0,40 0,13
1x230
63 6,4 8,3 11,4 65
910 2825 0,57 0,19 66 7,1 9,2 13,5
HG44 25 ÷ 45 500 5210 0,78 0,24 64 5,1 6,7 7,9 112
650 6725 1,11 0,36 70 6,0 7,9 10,2
B - 3x400 V, AC motor, 2-stage (upper speed range)
HG25 20 ÷ 30 890 3085
3x400
0,59 0,27
1x230
69 7,5 9,8 14,7 65
1270 4035 0,83 0,38 74 9,0 11,7 19,3
HG45 40 ÷ 60 740 8065 2,02 0,63 75 6,8 8,9 12,3 112
910 9475 2,04 0,78 79 7,6 9,9 14,4
D - 1x230 V, AC motor, 2-stage (lower speed range)
HG24 15 ÷ 25 460 1705 1x230 0,79 0,12 1x230 55 5,1 6,6 8,1 65
890 2790 0,89 0,21 66 7,0 9,1 13,3
E - 1x230 V, AC motor, 2-stage (upper speed range)
HG25 20 ÷ 30 780 2820
1x230
1,88 0,26
1x230
66 7,1 9,2 13,5 65
1210 4105 2,04 0,43 74 9,1 11,8 19,6
HG45 40 ÷ 60 700 8455 3,93 0,67 77 7,0 9,2 12,9 112
910 9555 3,71 0,83 82 7,6 10,0 14,5
R - 3x400 V, AC motor, 2-stage (upper speed range)
HG45 40 ÷ 60 650 8020 3x400 1,87 0,72 1x230 72 6,8 8,9 12,2 112
870 10425 2,72 1,08 79 8,1 10,6 15,8
Y - 1x230 V, EC motor, 3-stage
HG 24 15 ÷ 25
1185 3350
1x230
1,38 0,31
1x230
74 8,0 10,4 16,0
651356 3900 1,91 0,43 79 9,0 11,6 18,6
1605 4590 2,31 0,53 82 10,1 13,1 22,0
HG 44 25 ÷ 45
727 7600 2,27 0,47 72 6,7 8,2 11,4
112772 8200 2,52 0,55 73 7,1 8,6 12,3
840 8900 3,03 0,67 74 7,5 9,1 13,4
Z - 3x400 V, EC motor, 3-stage
HG 44 25 ÷ 45
740 7600
3x400
1,30 0,50
1x230
70 6,7 8,2 11,4
112791 8200 1,41 0,58 72 7,1 8,6 12,3
854 8900 1,56 0,69 74 7,5 9,1 13,4

Specifications MultiMAXX HG
14 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
2.7 Commission Regulation (EU) 2016/2281 from November 30, 2016
Values of Tab. 2-5 are intended to implement Directive 2009/125/EC of the European
Parliament and of the Council establishing a framework for the setting of ecodesign
requirements for energy-related products with regard to air heating products, cooling
products, high temperature process chillers and fan coil units.
Unit information
B1 air heater: no
C2 air heater: no
C4 air heater: no
Fuel type: gaseous - natural gas
Tab. 2-5: Values according to Regulation (EU) 2016/2281
Model size
Units
Capacity Usefulness Other product data Power consumption
Nominal heat output Prated,h Minimum power Pmin Efficiency at Nominal heat output ƞnom Efficiency at Minimum power ƞpl Hull loss factor Fenv Power consumption of the pilot flame Pign Nitrogen oxide emissions NOx Efficiency of heat output ƞs,flow Space heating- Annual efficiency ƞs,h at nominal heat output Pelmax at minimum power Pelmin at standby Pelsb
[kW] [kW] [%] [%] [%] [kW] [mg/kWh
energy input
(calorific
value)]
[%] [%] [kW] [kW] [kW]
2
HG24.######.A## 21,7 13,8 87,8 93,2 0,0 0,0 40 94,6 84,5 0,043 0,030 0,008
HG24.######.D## 21,7 13,8 87,8 93,2 0,0 0,0 40 91,9 82,0 0,043 0,030 0,008
HG24.######.Y## 21,3 13,5 87,8 93,2 0,0 0,0 40 96,0 85,8 0,043 0,030 0,008
HG25.######.B## 25,6 18,0 86,6 90,5 0,0 0,0 40 94,2 81,3 0,057 0,034 0,008
HG25.######.E## 25,6 18,0 86,6 90,5 0,0 0,0 40 93,7 80,9 0,057 0,034 0,008
4
HG44.######.A## 39,7 20,7 94,6 96,0 0,0 0,0 50 95,9 90,0 0,098 0,055 0,008
HG44.######.Y## 37,5 20,4 94,6 96,0 0,0 0,0 50 97,2 90,9 0,098 0,055 0,008
HG44.######.Z## 39,7 20,4 94,6 96,0 0,0 0,0 50 97,2 90,9 0,098 0,055 0,008
HG45.######.B## 52,7 33,0 91,1 95,2 0,0 0,0 70 95,8 87,9 0,140 0,070 0,008
HG45.######.E## 52,7 33,0 91,1 95,2 0,0 0,0 70 96,0 88,0 0,140 0,070 0,008
HG45.######.R## 52,7 33,0 91,1 95,2 0,0 0,0 70 95,8 87,9 0,140 0,070 0,008

MultiMAXX HG Specifications
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications15
2.8 Air-side accessories
The following accessory items can be delivered for the MultiMAXX HG unit heater:
Symbol "#" - see type code page 3.
Description Type code Model
Mixed-air module, type 1 ZH#.200# Outdoor air and recirculation air offset by 90°; galvanized sheet steel, alu-
minum profile blades
Mixed-air module, type 2* ZH#.210# Outdoor air and recirculation air offset by 90°; galvanized sheet steel, alu-
minum profile blades
Blocking damper outdoor air* ZH#.230# Outdoor air feed; galvanized sheet steel, Al profile fins
Flexible connection ZH#.2500 Elastic spacer, max. overall length 150 mm, sheet steel, plastic
Rectangular duct 150 ZH#.2600 Spacer, overall length 150 mm, sheet steel
Rectangular duct 1000 ZH#.2700 Spacer, overall length 1000 mm, sheet steel
Duct turn 90°, symmetrical ZH#.2800 Air duct with full-perimeter mounting frame, made of galvanized sheet
steel
Duct turn 90°, asymmetrical ZH#.2900 Air duct with full-perimeter mounting frame, made of galvanized sheet
steel
Wall air-intake hood ZH#.3100 Protection against rain with bird screen, made of galvanized sheet steel
External louvre ZH#.3200 Protection against rain with bird screen, made of galvanized sheet steel
Contact protection grille ZH#.3300 End grille for accessories
Duct through slanted roof ZH#.3400 Air duct for a connection to the roof air-intake hood, made of galvanized
sheet steel
Roof air-intake hood ZH#.35## Duct termination with or without bag filter insert, made of lacquered
galvanized sheet steel (RAL 9002)
Spare filter for air intake hood, roof ZH#.3802
ZH#.3804
ZH#.3808
Filter G2
Filter G4
Filter F7
Bag-filter module ZH#.36## With filter G2, G4 and F7 made of galvanized sheet steel with or without
differential pressure switch
Spare filter for bag filter module ZH#.3902
ZH#.3904
ZH#.3908
Filter G2
Filter G4
Filter F7
Mat filter module* ZH#.370# With filter G2, G3 and G4 made of galvanized sheet steel with or without
differential pressure switch
Replacement filter for mat filter module* ZH#.4002
ZH#.4003
ZH#.4004
Filter G2
Filter G3
Filter G4
Roof duct with flat roof-duct base ZH#.4900 made of plastic and galvanized sheet steel
Frame for wall connection ZH#.5100 For connecting the air duct to the wall opening, made of galvanized
sheet steel
Closing flange on discharge side ZH#.5200 For connecting the accessories on the suction side (recirculation unit on-
ly)
Galvanized sheet steel
Suspension type compact C ZH#.5300 For the suspension of a recirculation unit in wall/ceiling design
made of galvanized sheet steel
Suspension type Studio ZH#.5400 For the suspension of a recirculation unit, wall-mounted version only
made of galvanized sheet steel
Modular type suspension ZH#.550# For the suspension of a recirculating/mixed-air unit in wall version or a re-
circulating-air unit in ceiling version; made of galvanized sheet steel
Ceiling suspension ZH#.5600
ZH#.5601
ZH#.5602
ZH#.5603
Attachment without threaded rod, made of galvanized sheet steel
with threaded rod 1 m - M10; made of galvanized sheet steel
with threaded rod 2 m - M10; made of galvanized sheet steel
with threaded rod 3 m - M10; made of galvanized sheet steel
Tab. 2-6: Air-side accessories
* This accessory is not intended for units HG24.######.Y, HG44.######.Y a HG44.######.Z
Notice!
Detailed information on the air-side accessories can be found in the Technical data
MultiMAXX HG

Specifications MultiMAXX HG
16 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
2.9 Accessories - flue gas pipework, gas distribution
The following accessory items can be supplied for the MultiMAXX HG unit heater:
Notice!
All exhaust gas conducting parts contain silicon gaskets (upon request, also seals
without silicon can be delivered). Detailed information on the flue gas pipework
accessories can be found in the Technical data MultiMAXX HG.
Description Type Dimensions - model
Pipe with sleeve ZHG.3780 Diameter 80 mm, length 0.22 m, Al
ZHG.3710 Diameter 100 mm, length 0.22 m, Al
ZHG.3880 Diameter 80 mm, length 0.17 m, Al
ZHG.3810 Diameter 100 mm, length 0.17 m, Al
ZHG.3980 Diameter 80 mm, length 0.31 m, Al
ZHG.3910 Diameter 100 mm, length 0.35 m, Al
ZHG.4080 Diameter 80 mm, length 0.5 m, Al
ZHG.4010 Diameter 100 mm, length 0.5 m, Al
ZHG.4180 Diameter 80 mm, length 1 m, Al
ZHG.4110 Diameter 100 mm, length 1 m, Al
ZHG.4280 Diameter 80 mm, length 2 m, Al
ZHG.4210 Diameter 100 mm, length 2 m, Al
Coaxial pipe with sleeve ZHG.7080 Diameter 80/125 mm, length 0.5 m, Al
ZHG.7010 Diameter 100/150 mm, length 0.5 m, Al
ZHG.7180 Diameter 80/125 mm, length 1 m, Al
ZHG.7110 Diameter 100/150 mm, length 1 m, Al
ZHG.7280 Diameter 80/125 mm, length 2 m, Al
ZHG.7210 Diameter 100(150 mm, length 2 m, Al
Elbow fitting 90° with sleeve ZHG.4380 Diameter 80 mm, metal mixture Al
ZHG.4310 Diameter 100 mm, metal mixture Al
Coaxial elbow fitting 90° with sleeve ZHG.7380 Diameter 80/125 mm, metal mixture Al
ZHG.7310 Diameter 100/150 mm, metal mixture Al
Elbow fitting 45° with sleeve ZHG.4480 Diameter 80 mm, metal mixture Al
ZHG.4410 Diameter 100 mm, metal mixture Al
Coaxial elbow fitting 45° with sleeve ZHG.7480 Diameter 80/125 mm, metal mixture Al
ZHG.7410 Diameter 100/150 mm, metal mixture Al
T-fitting 45° with a condensate container ZHG.4580 Diameter 80 mm, Al
ZHG.4510 Diameter 100 mm, Al
T-fitting with sleeve ZHG.4680 Diameter 80 mm, Al
ZHG.4610 Diameter 100 mm, Al
Condensate container ZHG.4780 Diameter 80 mm, Al
ZHG.4710 Diameter 100 mm, Al
Pipe with sleeve and with condensate drain ZHG.4880 Diameter 80 mm, Al
ZHG.4810 Diameter 100 mm, Al
Windproof hood (wall) ZHG.4980 Diameter 80 mm, Al
ZHG.4910 Diameter 100 mm, Al
Coaxial windproof hood (wall) ZHG.7980 Diameter 80/125 mm, Al
ZHG.7910 Diameter 100/150 mm, Al
Roof air-intake hood ZHG.5080 Diameter 80 mm, Al
ZHG.5010 Diameter 100 mm, Al
Coaxial weather protection hood (ceiling) ZHG.9080 Diameter 80/125 mm, Al
ZHG.9010 Diameter 100/150 mm, Al
Flexi - pipe with sleeve - intake ZHG.5180 Diameter 80 mm, max. length 1 m. Al
ZHG.5110 Diameter 100 mm, max. length 1 m. Al
Flexi - pipe with sleeve - draft ZHG.5280 Diameter 80 mm, max. length 1 m. Al
ZHG.5210 Diameter 100 mm, max. length 1 m. Al
Connecting piece ZHG.9380 Diameter 80/125 mm, Al
ZHG.9310 Diameter 100/150 mm, Al
Reducer ZHG.5480 Diameter 80/100 mm, Al
Collar ZHG 5680 Diameter 80 mm, rubber
ZHG 5610 Diameter 100 mm, rubber
ZHG 9680 Diameter 125 mm, rubber
ZHG 9610 Diameter 150 mm, Al
Roof duct for flat roof ZHG.5710 For the flue gas pipework diameter 80, 100 a 125 mm, plastic
ZHG.9710 For the flue gas pipework diameter 150 mm, Al
Duct through slanted roof ZHG.5810 For the flue gas pipework diameter 80, 100 a 125 mm, plastic
Chimney collar for roof duct ZHG.5980 For the flue gas pipework diameter 80 mm, plastic
ZHG.5910 For the flue gas pipework diameter 100 mm, plastic
ZHG.9980 For the flue gas pipework diameter 125 mm, plastic
Set with 45° T-piece D45 ZHG.6080 Diameter 80/125 mm, Al
ZHG.6010 Diameter 100/150 mm, Al
Tab. 2-7: Accessories of the flue gas pipework and gas distribution

MultiMAXX HG Specifications
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications17
Set with 90° T-piece D90 ZHG.6180 Diameter 80/125 mm, Al
ZHG 6110 Diameter 100/150 mm, Al
Set D90L ZHG.6380 Diameter 80/125 mm, Al
ZHG.6310 Diameter 100/150 mm, Al
Set horizontal mounting W ZHG 6280 Diameter 80/125 mm, Al
ZHG 6210 Diameter 100/150 mm, Al
Pressure-side hose R 3/4" ZHG.0040 Length 0.4 m
ZHG.0070 Length 0.7 m
ZHG.0010 Length 1 m
Description Type Dimensions - model
Tab. 2-7: Accessories of the flue gas pipework and gas distribution

Shipping and storage MultiMAXX HG
18 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
3 Shipping and storage
3.1 Shipping
The notices of the manufacturer must be taken into account for shipping and storage.
3.2 Shipping and handling of the unit
•Attach the load equipment to the intended points on the transport unit!
Only lifting gear with sufficient load-bearing capacity is allowed.
Fig. 3-1: Shipping the MultiMAXX HG unit
Notice!
•After unpacking the heating unit, the shipment must be examined for correctness
and completeness on the basis of the dispatch note.
•Ship and store units in original packing!
Damage to the unit!
•After shipment, check to make sure that the unit is not damaged.
Notice!
Incorrectly delivered quantities or damages caused by shipping must be entered
immediately in the shipping voucher, or possibly the goods should not be accepted
and the manufacturer or supplier immediately informed.
Danger due to overhead loads!
Do not move air heaters over people.
Danger of sharp cutting edges!
Use personal protective gear such as safety gloves, footwear and protective clothes
during shipping.
Risk of personal injury!
Do not use damaged transport units.
Air heaters can only be transported by fork lifter if they are stored on a pallet. Pay
special attention to equal weight distribution!

MultiMAXX HG Shipping and storage
FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications19
3.3 Storage
Protect MultiMAXX HG Air Heaters against moisture, soiling (dust and sand) and sun/
radiant heat.
Store only in areas protected from weather influences, mildews, rodents, and vibrations.
The air heater or control system and other accessory items must not be stored or operated
in areas subject to salt spray
Notice!
Allowable storage conditions:
Air temperature: -15 °C to +40 °C
Air humidity: max. 80% without condensation

Mounting MultiMAXX HG
20 FläktGroup DC-2011-0141-GB 2021-01/R7 • Subject to modifications
4 Mounting
4.1 Load-bearing capacity of the installation site
4.2 Ceiling installation
The following must be planned: Suspension height, unit spacing (see Fig. 4-2), and min-
imum ceiling spacing (see Fig. 4-1).
Fig. 4-1: Suspension height for ceiling mounting
Notice!
When mounting MultiMAXX HG air-handling units, the safety regulations and stan-
dards and generally approved technical practice applicable in the respective coun-
tries must be observed.
Notice!
The installation site must be suited as a durable and vibration-free weight bearer of
the unit heater, and be checked by a structural engineer or architect if necessary.
For mounting the suspension of the MultiMAXX HG Air Heaters, the following are
provided 2 x 4 nut serts M8 are provided on the sides of the fan module (see
Fig. 2-2).
The fixing material is included with the suspensions.
Unused M8 nut sert openings should be closed with M8 screws from the transport
securing unit.
Risk of personal injury!
The minimum permissible height above the floor is 2.7 m.
Notice!
We recommend that the suspension height of the unit from the floor to the lower
edge of the diffuser be selected such that (see Fig. 4-1) 2 m above the floor in the
work area the air velocity is 0.2 m/s.
Suspension height