Explosion proof operating equipment for potentially explosive areas is classified in the European Standard EN 60079-X. The individual ignition protection categories are detailed in separate standards, such as:

Ignition protection categories	Standard
General requirements	EN 60079-0
Equipment protection by flameproof enclosures "d"	EN 60079-1
Equipment protection by pressurized enclosure "e"	EN 60079-7
Classification of areas - Explosive gas atmospheres	EN 60079-10-1
Equipment protection by intrinsic safety "i"	EN 60079-11
Construction, testing and marking for Group II electrical equipment with type of protection "n"	EN 60079-15

Rosenberg external rotor motors are in accordance with type of protection Increased Safety „e“. For Zone 1 this would be „eb“ and for Zone 2 „ec“.

These ignition protection categories are valid for electrical appliances in potentially explosive rooms and units, where gases or vapours can form or accumulate and produce explosive mixtures in combination with air.

The ignition protection category Increased Safety "eb" shows that increased safety measures are taken to prevent the possibility of inadmissibly high temperatures and the occurrence of sparks or electric arcs in the interior or on external components of electrical appliances which do not occur during normal operation.

Electrical equipment of ignition protection category "ec" is not able to ignite a surrounding potentially explosive atmosphere. They only can be used as category 3 (Zone 2) devices.

Zones

As a basis for determining the extent of requirements to be imposed, explosive areas are classified into zones according to the likelihood of a dangerous, explosive atmosphere or combustible dust. For combustible gases, vapours and mists, the following applies:

Zone 0

For areas where danger of an explosive atmosphere exists long-term (continuously) or frequently

Zone 1

For areas where danger of an explosive atmosphere exists during normal operation

Zone 2

For areas where danger of an explosive atmosphere seldom exists or only for short-term periods

Rosenberg ex-fans are suitable for the ventilation of explosive atmospheres in zones 1 and 2 as well as for installation in zones 1 and 2. When installing 2G fans in zone 2 or in non-potentially explosive atmospheres, or 3G fans in non-potentially explosive atmospheres, it should be taken into account that the fans are not gas-tight.

Temperature classes

Electrical appliances in potentially explosion areas are listed according to their maximum surface temperatures in temperature classes ranging from T1 to T6. The lowest temperature of ignition of the concerned potentially explosive atmosphere must be higher than the maximum surface temperature of the electrical appliance used (according to EN 60079).

Temperature classes	maximum surface temperature
T1	450 °C
T2	330 °C
T3	200 °C
T4	130 °C
T5	100 °C
T6	85 °C

Rosenberg fans in the Ex-versions are used for the temperature classes T1 to T3 (T4 on request).

Rosenberg Ex-fans are equipped with external rotor motors with a protection class IP44 as a standard, insulation class F and ignition protection category Ex "eb" or Ex "ec", or standard IEC motors with a protection class IP 55, insulation class F and ignition protection category Ex e (Ex eb /Ex ec available upon request). The motors were tested by the PTB (Federal Physical Technical Institute) and correspond to the European Standards series 60079-xx.

Motor protection of external rotor motors

The winding of the motors feature integrated triple PTC thermistor temperature sensors according to DIN 44082, which must be connected to a PTC thermistor tripping unit with protective labelling Ex II (2)G as motor protection. This specific thermal motor protection is capable of precisely identifying any abnormal operating conditions and external influences, and will then disconnect the motor from the mains via a contactor in the event of any conceivable malfunction. It is only permissible to install commercially available motor circuit breakers as additional safety devices, since they are not able to ensure complete motor protection under all conceivable operating conditions (e.g. operation with reduced voltage).

Speed control of external rotor motors

The design of the drive motors allows for a stable modulation of the motor speed via a voltage reduction. Only transformer controllers may be used for this purpose. Rosenberg controllers for use with explosion-proof fans already contain the mandatory essential PTC tripping device, but they must not be operated directly in a potentially explosive zone.  Refer to the tables of the accessory list for the allocation of the controllers. The permissible voltage modulation range of between 25 and 100 % of the nominal voltage meets the typical requirements of systems with a variable volumetric flow. If the system is operated in the reduced-voltage range, the operating current may exceed the nominal current. The percentage current increase in comparison to the nominal current is listed in the data tables as Delta I. Controller and control units must be designed to handle the maximum operating current. Regular external rotor motors with the ignition protection category “eb” are not allowed to be used with frequency converters.

Motor protection of IEC standard motors

Standard motors have to be fitted with an upstream motor protection switch. The information provided by the motor manufacturer is to be observed. Standard motors with the PTC thermistor permit as single motor protection can also be protected with a PTC thermistor tripping unit. Refer here to information under motor protection for external rotor motors. However, an authorised motor protection device must be connected in any case.

Speed control of IEC standard motors

The speed of standard motors can be controlled by frequency converters. In this case, only motors with ignition protection categories "d" or "de" should be used.

Energy saving potential of EC Centrifugal fans, Size 560

Operating point	Short-term 100%	Day operation 80%	Night operation 60%
Air volume	8.000 m³/h	6.400 m³/h	4.800 m³/h
Static pressure	500 Pa	320 Pa	180 Pa
Power EC 1)	1.940 W	1.040 W	483 W
Power AC 2)	2.650 W	1.810 W	1.080 W
Operation time per day	2 hours	10 hours	12 hours
	Energy consumption per year			Total
Power consumption EC	1.416 kWh/a	3.796 kWh/a	2.116 kWh/a	7.328 kWh/a
Power consumption AC	1.935 kWh/a	6.607 kWh/a	4.730 kWh/a	13.271 kWh/a
Saving	518 kWh/a	2.811 kWh/a	2.615 kWh/a	5.944 kWh/a
Saving in %	26,8 %	42,5 %	55,3 %	44,8 %
	Cost saving per year 3)			1.189 EUR
	Emission reduction per year 4)			3,60 t CO2

1) Type: EHAG 560.6IF  •  2) comparable AC fan  •  3) electricity costs per kWh: 0,20 EUR  •  4) Source: Umweltbundesamt (0,605 kg CO₂ / kWh)

Energy saving potential of EC Tube fans, Size 250

Operating point	Short-term 100%	Day operation 80%	Night operation 60%
Air volume	500 m³/h	400 m³/h	300 m³/h
Static pressure	300 Pa	192 Pa	108 Pa
Power EC 1)	111 W	59 W	26 W
Power AC 2)	165 W	111 W	74 W
Operation time per day	2 hours	10 hours	12 hours
	Energy consumption per year			Total
Power consumption EC	81 kWh/a	215 kWh/a	114 kWh/a	410 kWh/a
Power consumption AC	120 kWh/a	405 kWh/a	324 kWh/a	850 kWh/a
Saving	39 kWh/a	190 kWh/a	210 kWh/a	439 kWh/a
Saving in %	32,7 %	46,8 %	64,9 %	51,7 %
	Cost saving per year 3)			88 EUR
	Emission reduction per year 4)			0,27 t CO2

1) Type: R 250 G.3BK • 2) comparable AC fan • 3) electricity costs per kWh: 0,20 EUR • 4) Source: Umweltbundesamt (0,605 kg CO₂ / kWh)

Energy saving potential of EC Duct fans, Size 400

Operating point	Short-term 100%	Day operation 80%	Night operation 60%
Air volume	2.500 m³/h	2.000 m³/h	1.500 m³/h
Static pressure	250 Pa	160 Pa	90 Pa
Power EC 1)	374 W	209 W	102 W
Power AC 2)	492 W	368 W	248 W
Operation time per day	2 hours	10 hours	12 hours
	Energy consumption per year			Total
Power consumption EC	273 kWh/a	763 kWh/a	447 kWh/a	1.483 kWh/a
Power consumption AC	359 kWh/a	1.343 kWh/a	1.086 kWh/a	2.789 kWh/a
Saving	86 kWh/a	580 kWh/a	639 kWh/a	1.306 kWh/a
Saving in %	24,0 %	43,2 %	58,9 %	46,8 %
	Cost saving per year 3)			261 EUR
	Emission reduction per year 4)			0,79 t CO2

1) Type: KHAG 400.5FA • 2) comparable AC fan • 3) electricity costs per kWh: 0,20 EUR • 4) Source: Umweltbundesamt (0,605 kg CO₂ / kWh)

Energy saving potential of EC Roof fans, Size 450

Operating point	Short-term 100%	Day operation 80%	Night operation 60%
Air volume	4.000 m³/h	3.200 m³/h	2.400 m³/h
Static pressure	360 Pa	230 Pa	130 Pa
Power EC 1)	791 W	422 W	198 W
Power AC 2)	983 W	632 W	358 W
Operation time per day	2 hours	10 hours	12 hours
	Energy consumption per year			Total
Power consumption EC	577 kWh/a	1.540 kWh/a	867 kWh/a	2.985 kWh/a
Power consumption AC	718 kWh/a	2.307 kWh/a	1.568 kWh/a	4.592 kWh/a
Saving	140 kWh/a	767 kWh/a	701 kWh/a	1.607 kWh/a
Saving in %	19,5 %	33,2 %	44,7 %	35,0 %
	Cost saving per year 3)			321 EUR
	Emission reduction per year 4)			0,97 t CO2

1) Type: DVW 450-G.5FA • 2) comparable AC fan • 3) electricity costs per kWh: 0,20 EUR • 4) Source: Umweltbundesamt (0,605 kg CO₂ / kWh)

Energy saving potential of EC Unobox, Size 450

Operating point	Short-term 100%	Day operation 80%	Night operation 60%
Air volume	3.600 m³/h	2.880 m³/h	2.160 m³/h
Static pressure	280 Pa	180 Pa	100 Pa
Power EC 1)	533 W	289 W	138 W
Power AC 2)	691 W	477 W	290 W
Operation time per day	2 hours	10 hours	12 hours
	Energy consumption per year			Total
Power consumption EC	389 kWh/a	1.055 kWh/a	604 kWh/a	2.048 kWh/a
Power consumption AC	504 kWh/a	1.741 kWh/a	1.270 kWh/a	3.516 kWh/a
Saving	115 kWh/a	686 kWh/a	666 kWh/a	1.467 kWh/a
Saving in %	22,9 %	39,4 %	52,4 %	41,7 %
	Cost saving per year 3)			293 EUR
	Emission reduction per year 4)			0,89 t CO2

1) Type: Uno 67-450-G.5HF • 2) comparable AC fan • 3) electricity costs per kWh: 0,20 EUR • 4) Source: Umweltbundesamt (0,605 kg CO₂ / kWh)

Casing

Casings are made of galvanised sheet steel. Side parts and the spiral-shaped guide plate are connected with rivets. In the side panels, there are holes for the fixing of the feet which can be implemented by 90°.

up to size 400

casing in spiral design

from size 450

casing in rectangular form

Impellers

The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.

Downloads

Casing

Casings are made of galvanised sheet steel. Side parts and the spiral-shaped guide plate are connected with rivets. In the side panels, there are holes for the fixing of the feet, which can be implemented by 90°.

up to size 400

casing in spiral design

from size 450

casing in rectangular form

model - EHA

single inlet design (E)

model - DHA

double-sided inlet design (D)

Impellers

The backward curved aluminium impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.

Downloads

Casing

The casing is made of galvanised sheet steel. The side parts and the spiral plate are connected to each other by rivets. With size 200, the motors are flange-mounted directly. From size 225, the motors are mounted on a console. A plastic coating is available upon request.

Impellers

The impellers of the EHN ... types are produced with backward curved blades made entirely of aluminium. The inlet cones made of galvanised sheet steel are screwed into the casing. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through the terminal box on the motor in protection class IP55.

Downloads

Casing

The casings are produced following the rotational casting procedure and are made of electrically conductible polyethylene (PE). The design allows removal of the motor with the impeller and the console without having to disconnect the casing from the duct system. The casing and stainless steel console are sealed to each other with an expanded PE sealing ring.

Consoles

The consoles are made of stainless steel material no. 1.4301. The console supports the motor and the spiral casing and, at the same time, forms the back wall of the casing. For mounting the motor, a motor supporting plate is screwed onto the console.

Impellers

Impellers of polypropylene with backward curved blades with high efficiency are used. The impellers together with the hubs are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection of the motor is done via the terminal box of the pre-assembled IEC standard motor.

Downloads

Casing

The casing consists of a double-skinned galvanised sheet steel with a non-flammable rock wool acoustic and moisture insulation. The motor-impeller unit can be pivoted for cleaning purposes by the generous operating door. The door hinge DIN right can be easily be converted to DIN left. Connecting pieces fit standard pipes.

Impellers

up to size 280

forward curved impeller made of galvanised sheet steel

from size 315

backward curved impellers made of aluminium

The impellers and the hubs as a unit are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is on the terminal box already loosely pre-assembled on the cable. The nominal voltage is indicated on the type shield and will allow for a voltage tolerance of ±10%.

Downloads

Casing

The flexible and compact EC Unoboxes ME are designed to handle air volumes with higher temperatures. A removable service door, an integrated drip pan with condensation drain nozzle, plus special sealing lips are included. The housing supporting frames are double chamber aluminum profiles with corners made of plastic and double skinned (20 mm) galvanized sheet steel panels insulated with non-inflammable, noise and temperature insulating fibreglass mats. Optionally, the outlet side (at the top or the side) can be selected. A changing of the air outlet and side panel at the installation site is possible at any time by setting of the flexible panels.

Impellers

Backward curved high-performance impellers made of aluminium are used. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The integrated motor protection is signaled via alarm relay. The electrical connection takes place on the preassembled isolator switch in the housing. In the version „open-loop control“(standard) the speed is adjusted via 0-10V Signal or a potentiometer (accessory). The connection hereto takes place directly at the EC-Controller inside the EC Unobox ME.

Downloads

Casing

The Rosenberg Unoboxes ME are designed to handle volume flows with low to medium conveying media temperatures. The housing consists of a frame made of an extruded aluminium profile with 2 chambers and plastic edges, as well as double-skinned, 20mm thick panels made of galvanised steel sheet metal with insulation made of non-combustible, sound and heat-insulated glass wool mats. The discharge and the operator side are interchangeable.

Impellers

Backward curved impellers made of high-performance aluminium are used. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

Connection will be done on the frontal mounted emergency switch.

Direction of rotation

The direction of rotation of the impellers is standard clockwise rotation (seen from the suction side). Counter-clockwise operation will cause overload damage to the motor.

Downloads

Casing

The casing of the Rosenberg roof fans (DVNF/S, DVN/S) consists of seawater-resistant aluminium and a base frame with integrated inlet cone.

model - DVNF/DVN

up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel

from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

model - DVNFS/DVNS

Casing with integrated sound insulation (S) ; base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel

from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

Impellers

Efficiency-optimised high performance impellers with backward curved blades made of aluminium. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11. The impellers are mounted overhung on the shaft of an IEC standard motor type B5.

Electrical connection

model - DVNF/DVNFS

The electrical connection is mounted on the housing by a frequency converter. With model -GS the electrical connection mounted directly by the ON/Off-switch.

model - DVN/DVNS

The wiring box of the motor is easily accessible. The motor has to be connected according to the wiring diagram and in accordance with valid regulations and local laws. With model -GS the electrical connection mounted directly by the ON/Off-switch.

Downloads

Casing

Base frames with threaded bolts for tightening of suction side accessories and retracted inlet cone made of galvanised sheet metal steel. Rain protective hood and square casing made of seawater-proof aluminium. Motor cage with integrated contact-protection made of plastic coated round bar steel. Housing with integrated sound insulation (S) for design DV(S)...G, DVE(S)...G and DVW(S)...G.

Impellers

Impellers are mounted directly to the rotor of the external rotor EC motor and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

model - DV(S)...G

Backward curved impellers made of plastic.

model - DVE(S)...G

Efficiency optimized and sound optimized backward curved impellers of the REVOLUTION series made of plastic.

model - DVW(S)...G

Efficiency optimized backward curved impellers made of aluminum.

Electrical connection

up to size 225

The motors are equipped with a built-on terminal box with easy access for electrical connection after removal of the rain cover.

from size 250

The electrical connection is possible over the mounted ON/OFF-switch.

Type "open loop"

In the “open loop” (standard) model, the speed is continuously provided by a 0-10V signal or a potentiometer (accessories).

Type "closed loop"

In the “closed loop” model, the pressure setpoint is continuously provided via a pre-wired potentiometer or a 0-10V signal. The pre-assembled pressure sensor has a display (Sizes 190-310 without display) with an adjustable pressure measurement range of (100 Pa, 300 Pa, 500 Pa, 1000 Pa).

Downloads

Casing

The casing of the Rosenberg roof fans DV(S) and DVE(S) consists of seawater-resistant aluminium and a base frame with integrated inlet cone (from size 560 with additional plastic coating). Casing with integrated sound insulation (Type DVS and DVES)

Impellers

Impellers are mounted directly to the rotor of the external rotor EC motor and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

model - DV(S)

Backward curved impellers made of plastic.

model - DVE(S)

Efficiency optimized and sound optimized backward curved impellers of the REVOLUTION series made of plastic.

Electrical connection

The drive motors are fitted with a set-up terminal box in IP54, which is easily accessible for the electrical connection after removing the rain guard. Upon request, the device switch can be mounted (optional) on the casing of the fan.

Downloads

Casing

The casing of the Rosenberg roof fans (DH, DHE) consists of seawater-resistant aluminium and a base frame with integrated inlet cone.

model - DH

Hood made of seawater-resistant aluminium; base frame with integrated inlet cone made of galvanised steel sheet

model - DHE

up to size 500: Hood made of seawater-resistant aluminium; base frame with integrated inlet cone made of galvanised steel sheet

from size 560: Hood made of galvanised steel; base frame with integrated inlet cone made of galvanised steel sheet and additionally plastic coated

Impellers

Impellers are mounted directly to the rotor of the external rotor EC motor and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

model - DH

Backward curved impellers made of plastic.

model - DHE

Efficiency optimized and sound optimized backward curved impellers of the REVOLUTION series made of plastic.

Electrical connection

The drive motors are fitted with a set-up terminal box in IP54, which is easily accessible for the electrical connection after removing the rain guard. Upon request, the device switch can be mounted (optional) on the casing of the fan.

Downloads

Casing

The casing of the Rosenberg roof fans (DVNF/S, DVN/S) consists of seawater-resistant aluminium and a base frame with integrated inlet cone.

model - DVNF/DVN

up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel

from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

model - DVNFS/DVNS

Casing with integrated sound insulation (S) ; base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

up to size 500: Base frame with integrated inlet cone made of galvanised sheet steel

from size 560: Base frame with integrated inlet cone made of galvanised sheet steel and additional plastic coating

Impellers

Efficiency-optimised high performance impellers with backward curved blades made of aluminium. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11. The impellers are mounted overhung on the shaft of an IEC standard motor type B5.

Electrical connection

model - DVNF/DVNFS

The electrical connection is mounted on the housing by a frequency converter. With model -GS the electrical connection mounted directly by the ON/Off-switch.

model - DVN/DVNS

The wiring box of the motor is easily accessible. The motor has to be connected according to the wiring diagram and in accordance with valid regulations and local laws. With model -GS the electrical connection mounted directly by the ON/Off-switch.

Downloads

Properties

Sickle formed profiled impellers made of cast aluminium result in a very low noise spectrum. The main concern was to keep noise emission low in the main range of application of the fan, while having an optimal performance curve with the long and short inlet cones.

Guard

Serves as contact protection and for mounting the fan onto the inlet cone.

Inlet cones

External dimensions according to customer requirements. If necessary, please submit a drawing.

Downloads

Properties

Sickle formed profiled impellers made of cast aluminium result in a very low noise spectrum. The main concern was to keep noise emission low in the main range of application of the fan, while having an optimal performance curve with the long and short inlet cones.

Guard

Serves as contact protection and for mounting the fan onto the inlet cone.

Inlet cones

External dimensions according to customer requirements. If necessary, please submit a drawing.

Downloads

Properties

Sickle formed axial impellers result in a very low noise spectrum. The main concern was to keep noise emission low in the main range of application of the fan, while having an optimal performance curve with the long and short inlet cones. The impellers are designed as follows:

size from 350 to 450

made of sheet steel

size from 450N to 630

of aluminium sheet

Guard

Serving as contact protection and for mounting the fan onto the inlet cone.

Inlet cones

External dimensions according to customer requirements. If necessary, please submit a drawing.

Downloads

Casing

The casings of the EC axial fans are manufactured from galvanised sheet steel with white powder plastic coating and protection guard with black powder plastic coating.

Impellers

The EC axial fans have aerodynamically shaped blades:

size 200

made of plastic

size from 250 to 400

made of black painted and galvanised steel sheet

size from 450 to 1000

made of aluminium

Electrical connection

The electrical connection can be made at the motor size G9, V8, GD84 and GD112 (230V) via lead out connection cable and for the motor size GD112 (400V) and GD150 directly via cable gland at the integrated terminal box of the motor. The integrated motor protection is signaled via alarm relays at size 350 to 1000. For the size 200 to 300 a tachometer output is available. In the version „open-loop control“(standard) the speed is adjustable via 0-10V Signal or a potentiometer (optional).

Downloads

Casing

The casings of the high-performance axial fans are manufactured from galvanised sheet steel and get an electrostatically applied powder plastic coating.

model EQ/DQ:

with square wall plate

model ER/DR:

pipe sleeve with double-sided standard flange for pipe installation

Impellers

The high-performance axial fans have aerodynamically shaped blades:

size from 200 to 300

made of painted and galvanised steel sheet

size from 315 to 630-6

made of plastic

size from 630-4 to 1000

made of die-cast aluminium

The impellers or blades are mounted directly on the rotor of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Motors

size from 200 to 300

motor protection class IP44

size from 315 to 1000

motor protection class IP54

External rotor motors are used with moisture protection, with built-in ball bearings, and are designed with thermal overload protection. The drive by the external rotor motor provides a space-saving, compact and attractive design. The motor sits inside the impeller and is thus optimally cooled. For this reason, a 100% variable speed control can be guaranteed. Only well-dimensioned ball-bearings, fitted on both sides and with a long-life lubricant, are used. Both ball-bearing seats are ground to high precision in one work step to eliminate any vibration. External rotor motors are also characterised by an extremely low starting current. The windings comply with thermal class F. In addition, the windings have standard moisture impregnation.

Electrical connection

The motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.

Downloads

Axial fans with adjustable blades cover a wide capacity range due to their large variation possibilities with hub relation, number of blades and blade angle. With the Rosenberg ANDB series pressure increase up to 1.200 Pa and volumes up to 80.000 m³/h can be realized.

Properties

The Rosenberg centrifugal fans with free running, backward-curved, high-performance impellers in the GKHM / GKHS / GKHR series form a very compact, constructively optimal ventilator unit in conjunction with an electronically commutated external rotor motor (EC motor) with newly developed integrated power electronics.

In developing these centrifugal fans, compact power electronics was adapted to the proven Rosenberg EC external rotor motor (GD 150). This drive concept results in a very compact unit in which the EC controller and the EC motor no longer have to be physically installed separately from each other.

Free running impellers with EC motors are available depending on the size of different designs:

GKHM

fan built-in module

GKHS

fan built-in module with spider design

GKHR

motor impeller with or without loose enclosed inlet cone

Electrical connection

The mains connection and the contacting of all control and signal inputs are carried out directly on the motor. This eliminates the time-consuming connection with shielded cables.

Speed control

The infinitely variable speed input of the motor is done by connecting an external potentiometer (accessory) or an external 0-10 V/PWM signal.

Downloads

Properties

The Rosenberg centrifugal fans with free running, backward-curved, high-performance impellers in the GKHB series form a very compact, constructively optimal ventilator unit in conjunction with an electronically commutated external rotor motor (EC motor) with newly developed integrated power electronics.

Electrical connection

The fans are delivered ready for installation and are equipped with an easily accessible motor terminal box. The electrical installation must be done in accordance with the valid provisions and observing the local regulations. A wiring diagram is included each engine, from which the correct connection of the motor can be seen. The motor connection is only carried out with shielded cable and may not exceed a total length of 10 m. The operating instructions of the electronic commutating unit must be observed.

Speed control

The infinitely variable speed input of the motor is done by connecting an external potentiometer (accessory) or an external 0-10 V / PWM signal.

Downloads

Properties

The fans are designed mainly for device installation and are preferably used in air-conditioners, hygiene equipment, clean room filter units and HVAC systems. During the development of the backward-curved impeller for use without a spiral casing, special emphasis was placed on optimising efficiency over a wide characteristic curve with high power density, whilst having as optimal a noise level as possible. The fans are designed to convey air and other non-aggressive gases or vapours. As drive motors, asynchronous external rotor motors from our own production are used. In addition to the modular design (DKHM), these fans are also available as a motorised impeller (DKHR).

Impellers

The impellers with 8 backward-curved blades are made of aluminium sheet (AIMg3) and statically and dynamically balanced together with the impeller hub or the external rotor motor used according to the quality level G 2,5 / G 6,3 as per DIN ISO 21940-11. If desired, the wheels can also be manufactured from sheet steel with a plastic coating. The direction of rotation of the impellers is standard clockwise rotation (seen from the suction side). Counter-clockwise operation will cause overload damage to the motor. Therefore, the direction of rotation should always be checked before starting up.

Electrical connection

Electrical connection via external terminal box protection class IP44.

Downloads

Properties

Fan module with motor mount and base frame. Screwed into the inlet cone and adjusted to optimum immersion depth. Entire unit can be installed decoupled through vibration or spring damper elements. Drive motor in type IMB3, IMB5 version available on request. Standard version for installation with a horizontal motor shaft; with additional mounting rail, module can also be used hanging with vertical motor shaft. Fan module without base frame. Screwed into the inlet cone and adjusted to optimum immersion depth. Drive motor in type IMB5.

Motors

IEC standard three-phase motors in IMB3 or IMB5 design. Protection class IP55, 400V/50Hz, thermal class F. The motors are suitable for operation with a frequency converter. The detailed information provided by the motor manufacturer for commissioning and maintenance, especially with regard to site provided motor protection devices, must be observed.

Motor protection

All motors have PTC thermistors inserted in the winding (motors with thermal contacts upon request), which automatically monitor the winding temperature of the motor. If wired correctly, they protect the motor from overload, failure of a mains phase, brake locking of the motor, and from air temperatures which are too high. The motor protection devices offered by us include the motor protection device in combination with PTC thermistors in the MSD1 K model. In general, the PTC thermistor can be connected directly to the frequency converter used.

Electrical connection

The drive motors are fitted with an outgoing cable. The electrical connection is made via a protection class IP44 terminal box which is supplied loose.

Downloads

Casing

Casings are made of galvanised sheet steel. Side parts and the spiral-shaped guide plate are connected with rivets. In the side panels, there are holes for the fixing of the feet, which can be implemented by 90°.

model - ERA

single inlet design (E)

model - DRA

double-sided inlet design (D)

Impellers

The impeller is made of galvanised sheet steel and is mounted directly to the rotor of the external rotor motor and balanced dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The drive motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.

Downloads

Casing

The casing is made of galvanised sheet steel. On request, a plastic coating can be applied at an additional cost.

model - ERA

single inlet design (E)

model - DRA

double-sided inlet design (D)

Impellers

The impeller is made of galvanised sheet steel, and is mounted directly to the rotor of the external rotor motor and balanced dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The drive motors are fitted with an outgoing cable. The electrical connection is made via an IP54 terminal box which is supplied loose.

Downloads

Casing

The casing is made of galvanised sheet steel. The side parts and the spiral plate are connected to each other by rivets. With size 200, the motors are flange-mounted directly. From size 225, the motors are mounted on a console. A plastic coating is available upon request.

Impellers

The impellers of the ERN... types with forward curved blades are manufactured from galvanised sheet steel. The inlet cones made of plastic are screwed into the casing. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through the terminal box on the motor in protection class IP55.

Downloads

Casing

The casings are made of galvanised sheet steel. The fans are only suitable for indoor installation.

Impellers

Backward curved high-performance impellers made of plastic are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through a terminal box mounted on the casing with protection class IP54. The built-in motor protection is signalled via a digital output or a pulse output.

Assembly

Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Rosenberg tube fans can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

The casings are made of galvanised sheet steel.

Impellers

Up to size 315L, backward curved high-performance impellers made of plastic are used, from size 355, backward curved, high-performance impellers made of aluminium are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Size 100 - 250

backward curved high-performance impellers made of plastic

Size 250L - 315M

backward curved high-performance impellers made sheet steel

Size 355

backward curved high-performance impellers made of plastic

Electrical connection

The electrical connection is made through a terminal box mounted on the casing with protection class IP54.

Assembly

Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Rosenberg tube fans can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

All sizes have an elegant, high-impact, flame-retardant plastic housing with an integrated terminal box IP44 and guide vanes.

Impellers

The impellers up to size 250 are made of plastic and from size 315 are made of galvanised sheet steel. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through a terminal box mounted on the casing with protection class IP44.

Assembly

Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Rosenberg tube fans can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

The casing is made of galvanised sheet steel. The 40 mm thick mineral fibre plates inserted act as sound insulation. The cover can be simply screwed off making the fan area easily accessible for cleaning and maintenance. The fan inside can be disassembled.

Impellers

The fans are driven by an external rotor EC motor, fitted in the centrifugal impeller. EC Zeroboxes of type EVOLUTION up to size 250 have a forward curved centrifugal impeller, from size 315 backward curved centrifugal impellers are used. All sizes of type REVOLUTION have backward curved impellers.

Electrical connection

The electrical connection is made through a terminal box mounted at the housing. The built-in motor protection is signalled via a digital output or a pulse output.

Assembly

Rigid folded spiral-seam tube (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Zeroboxes can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

The casing is made of galvanised sheet steel. The 40 mm thick mineral fibre plates inserted in the REVOLUTION Series act as sound insulation. The cover can be simply screwed off, making the fan area easily accessible for cleaning and maintenance. The motor can be disassembled with impeller and spiral casing.

Impellers

External rotor motors are used in protection class IP44/54 with humidity protection, ball bearing-mounted and with built-in thermal contacts for motor protection. In the REVOLUTION version, the impeller is backward curved. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through a terminal box with protection class IP44.

Assembly

Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Zeroboxes can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

The casings are made of galvanised sheet steel, formed as a rectangular duct, for direct installation in air ducts in any position. Suction and pressure side equipped with standard flanges. The complete motor-impeller unit can be folded out for cleaning purposes. The sound-proofed series (..WS) provides extremely low noise values with a space-saving, sound-absorbing perforated plate coating at concise points. The fans are only suitable for indoor installation.

Impellers

Aluminium sheet impellers (ALMg3) with backward curved blades are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11..

Electrical connection

Integrated motor protection is indicated via an alarm relay. In the “open loop” (standard) model, the speed is continuously provided by a 0-10V signal or a potentiometer (accessory). 

Direction of rotation

The direction of rotation is clockwise as seen from the suction side.

Downloads

Casing

Casings are made of galvanised steel sheet in the shape of rectangular ducts for direct installation into an air duct in every position. Suction and pressure side equipped with standard flanges. The complete motor-impeller unit can be folded out for cleaning purposes. The sound-proofed series (..WS) provides extremely low noise values with a space-saving, sound-absorbing perforated plate coating at concise points. The fans are only suitable for indoor installation.

Impellers

Aluminium sheet impellers (ALMg3) with backward curved blades are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11..

Electrical connection

The drive motors are fitted with an outgoing cable. The electrical connection is made via an IP44 terminal box which is supplied loose.

Direction of rotation

The direction of rotation is clockwise as seen from the suction side.

Downloads

Casing

The housing consists of a frame made of an extruded aluminium profile with 2 chambers and plastic edges, as well as double-skinned, 20 mm thick panels made of galvanised steel sheet metal with insulation made of non-combustible, sound and heat-insulated glass wool mats. As standard, one casing wall is left open opposite the impeller. EC Unoboxes are suitable for outdoor installation with appropriate accessories.

Impellers

Backward curved high-performance impellers of aluminium are used. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection for size 50 is done on the lead-out terminal box, from size 67 directly at the motor terminal space (cable routing provided). Integrated motor protection is indicated via an alarm relay. In the “open loop” (standard) model, the speed is continuously provided by a 0-10V signal or a potentiometer (accessory). 

Downloads

Casing

The housing consists of a frame made of an extruded aluminium profile with 2 chambers and plastic edges as well as double-skinned, 20 mm thick panels made of galvanised steel sheet metal with insulation made up of non-combustible, sound and heat-insulated glass wool mats. As standard, one casing wall is left open. Unoboxes are suitable for outdoor installation with appropriate accessories.

Impellers

Unoboxes up to size 450 have backward curved centrifugal impellers made of plastic with galvanised steel support plates. Fans with a size 500 and larger have backward curved high-performance impellers made of aluminium. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The terminal box is affixed to the motor housing and can be supplied with flying leads on request.

Direction of rotation

The direction of rotation of the impellers is standard clockwise rotation (seen from the suction side). Counter-clockwise operation will cause overload damage to the motor.

Downloads

Casing

The flexible and compact EC Unoboxes ME are designed to handle air volumes with higher temperatures. A removable service door, an integrated drip pan with condensation drain nozzle, plus special sealing lips are included. The housing supporting frames are double chamber aluminum profiles with corners made of plastic and double skinned (20 mm) galvanized sheet steel panels insulated with non-inflammable, noise and temperature insulating fibreglass mats. Optionally, the outlet side (at the top or the side) can be selected. A changing of the air outlet and side panel at the installation site is possible at any time by setting of the flexible panels.

Impellers

Backward curved high-performance impellers made of aluminium are used. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The integrated motor protection is signaled via alarm relay. The electrical connection takes place on the preassembled isolator switch in the housing. In the version „open-loop control“(standard) the speed is adjusted via 0-10V Signal or a potentiometer (accessory). The connection hereto takes place directly at the EC-Controller inside the EC Unobox ME.

Downloads

Casing

The Rosenberg Unoboxes ME are designed to handle volume flows with low to medium conveying media temperatures. The housing consists of a frame made of an extruded aluminium profile with 2 chambers and plastic edges, as well as double-skinned, 20mm thick panels made of galvanised steel sheet metal with insulation made of non-combustible, sound and heat-insulated glass wool mats. The discharge and the operator side are interchangeable.

Impellers

Backward curved impellers made of high-performance aluminium are used. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

Connection will be done on the frontal mounted emergency switch.

Direction of rotation

The direction of rotation of the impellers is standard clockwise rotation (seen from the suction side). Counter-clockwise operation will cause overload damage to the motor.

Downloads

Casing

The casing is made of galvanised sheet steel. The 40 mm thick mineral fibre plates inserted act as sound insulation. The cover can be simply screwed off making the fan area easily accessible for cleaning and maintenance. The fan inside can be disassembled.

Impellers

The fans are driven by an external rotor EC motor, fitted in the centrifugal impeller. EC Zeroboxes of type EVOLUTION up to size 250 have a forward curved centrifugal impeller, frome size 315 backward curved centrifugal impellers are used. All sizes of type REVOLUTION have backward curved impellers.

Electrical connection

The electrical connection is made through a terminal box mounted at the housing. The built-in motor protection is signalled via a digital output or a pulse output.

Assembly

Rigid folded spiral-seam tube (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Zeroboxes can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Casing

The casing is made of galvanised sheet steel. The 40 mm thick mineral fibre plates inserted in the REVOLUTION Series act as sound insulation. The cover can be simply screwed off, making the fan area easily accessible for cleaning and maintenance. The motor can be disassembled with impeller and spiral casing.

Impellers

External rotor motors are used in protection class IP44/54 with humidity protection, ball bearing-mounted and with built-in thermal contacts for motor protection. In the Evolution version, the impeller is forward curved and has double-sided inlets. The impellers are mounted directly on the rotors of the external rotor motors and are dynamically balanced on two levels with the rotor according to quality level G 2,5 / G 6,3 as per DIN ISO 21940-11.

Electrical connection

The electrical connection is made through a terminal box with protection class IP44.

Assembly

Rigid folded spiral-seam tubes (Spiro), flexible aluminium or plastic tubes with standardised diameter can be used. Zeroboxes can be used in all mounting positions. When used over several floors of a building, the local fire safety regulations must be observed.

Downloads

Transition piece square to round

• available for SupraBox COMFORT 1900 D
• for the transition to round ducts
• made of galvanised sheet steel
• optional on DN 355 or DN 400
  (additional accessories depend in part on the selected transition piece!)
• T-double lip seal for tight connection

Duct silencer

• available for all SupraBox COMFORT (D)
  (assignment for SupraBox COMFORT 1900 D depending on the selected transition piece)
• round connections
• outer casing and perforated inner duct of galvanised sheet steel
• sound dampening 50 mm
• socket with lip seal
• for direct integration into the pipe system

Flexible connections

• available for all SupraBox COMFORT (D)
• with SupraBox COMFORT 1100 D with round connections
• with SupraBox COMFORT 1900 D with square connections
  (transition to round can be done afterwards)
• for decoupling the SupraBox to the duct system
• complete set consisting of 4 pieces
• made of galvanised steel and silicone-free PVC fabric
• the right connection for standard spiral ducts
• T-lip seal for quick and tight connections

Manually-operated shut-off valve

• available for SupraBox COMFORT 1100 D
• round connections
• tight-sealing, tightness category 4 behind closed baffle
• damper blade is made of doubled sheet steel and has a gasket
  of EPDM rubber placed in between the blades which rests
  on the inside of the valve sleeve when closed

Motor-driven shut-off valve

• available for all SupraBox COMFORT
• with SupraBox COMFORT 1100 D with round connections
• with SupraBox COMFORT 1900 D with square connections
• tight fitting, tightness category 4 behind closed baffle
  (tightness category 2 with shut-off valve for SupraBox COMFORT 1900 D)
• design as manually operated shut-off valve, but with console for motor drive
  including suitable servo motor
• function open/close, voltage 24V, without return spring
  (with return spring upon request)

Electronic reheater coil

• available for all SupraBox COMFORT (D)
  (assignment for SupraBox COMFORT 1900 D depending on the selected transition piece)
• round connections
• for post-tempering of the supply air
• installation kit consisting of electric heater coil and duct temperature sensor
• available in different capacities
• integrated continuous electronic control with thyristor,
  allowing for capacity control from 0-100%
• actuation of the control electronics via the SupraBox via 0...10V
• caution: only suitable for indoor installation

PTC electronic pre-heater

• available for SupraBox COMFORT 1100 D
  (for SupraBox COMFORT 1900 D electronic pre-heater as installation kit)
• for optimum antifreeze protection
• installation kit for installation in the outdoor air outlet
• PTC electronic pre-heater and duct temperature sensor
• integrated temperature sensor
• caution: only suitable for indoor installation

Electronic pre-heater

• available for SupraBox COMFORT 1900 D
• for optimum antifreeze protection
• coil similar to the electronic repeaters
• switching on and off via SupraBox
  (integrated contactor)
• caution: only suitable for indoor installation

PWW Reheater

• available for all SupraBox COMFORT 
  (transitions round; in SupraBox COMFORT 1900 D without transitions)
• for post-tempering of the supply air
• available per size with 2 or 4 pipe series
• galvanised steel frame
• blade spacing 2.0 mm, equivalent to DIN EN 13053
• antifreeze protection thermostat already mounted on coil frame

PKW Aftercooler

• available for all SupraBox COMFORT
  (transitions round; in SupraBox COMFORT 1900 D without transitions)
• for post-tempering of the supply air
• galvanised steel frame
• condensate tub aluminium AlMg3, condensate drain 1/2"
• blade spacing 2.5 mm, equivalent to DIN EN 13053

Replacement filter, exhaust filter M5

• available for all SupraBox COMFORT

Replacement filter, supply air filter F7

• available for all SupraBox COMFORT

Freezing of the heat exchanger

The surface temperature of the counterflow plate heat exchanger decreases with falling outside temperatures. If this falls below the dew point of the exhaust air, condensate drops on the plates of the heat exchanger. The dew point depends on the absolute humidity content of the air. Although the condensation energy of the water increases the efficiency of the counterflow plate heat exchanger that is related to the air supply, freezing takes place here under certain conditions.

If the units of the SupraBox COMFORT series are used in applications where the exhaust air is only slightly humid, heat recovery can work well below -10°C without losses. If the exhaust air comes from wet rooms, however, antifreeze protection may already be needed at -5°C and below.

Since the average outdoor temperature in Central Europe is typically above 0°C during the heating season, there are only a few days a year where antifreeze protection is necessary. Thus, efficiency rating reductions in this area have a diminishing impact on the efficiency rating of the unit over the whole year.

Intelligent 3-sequence defrosting concept

All compact air handling units in the SupraBox COMFORT series include an intelligent 3-sequence defrosting concept. The special feature here is that the integrated bypass of the equipment is NOT used to defrost the counterflow plate heat exchanger. An expensive, highly dimensioned reheater is not needed because the heat recovery is not bypassed.

Depending on the settings done during the commissioning as well as the accessories used, up to 3 sequences are available to defrost the counterflow plate heat exchanger. These are explained as follows.

The counterflow plate heat exchanger is monitored for freezing using a differential pressure switch. If the heat exchanger freezes, this is detected by the differential pressure switch and the defrosting operation is initiated automatically by the control.

During commissioning, the antifreeze strategy to be used can be defined (sequences).

1. If an imbalance of the fans is allowed (adjustable via keypad), the supply air fan is reduced by 30% in the event of freezing to generate defrosting from the warmer exhaust air.
2. If an electronic preheating is connected (accessory) and released (adjustable via keypad), this is activated in the event of freezing to preheat the outside air and thus defrost the heat exchanger.
3. If both options have been released, the supply air will be reduced first. If this is not sufficient, the preheating is activated after 5 minutes.
4. If neither measure is effective or none of the measures are possible (missing release), the SupraBox COMFORT is disabled and an alarm is displayed. After 10 minutes, the SupraBox COMFORT restarts the fans automatically and the sequences are "executed" again. An acknowledgement of the alarm is not necessary.

Antifreeze protection - preheating for prevention

Optionally, the preheating can be used preventively by setting the control unit of the SupraBox COMFORT unit. If this is the case, the pre-heating is already switched on at an adjustable outdoor air temperature to prevent the heat exchanger freezing.

Duct silencer

• available for all SupraBox COMFORT (V)
• round connections
• outer casing and perforated inner duct of galvanised sheet steel
• sound dampening 50 mm
• socket with lip seal
• for direct integration into the pipe system

Flexible connections

• available for all SupraBox COMFORT (V)
• round connections
• for decoupling the SupraBox to the duct system
• complete set consisting of 4 pieces
• made of galvanised steel and silicone-free PVC fabric
• the right connection for standard spiral ducts
• T-lip seal for quick and tight connections

Motor-driven shut-off valve

• available for all SupraBox COMFORT (V)
• round connections
• tight-sealing, tightness category 4 behind closed baffle
• design as manually operated shut-off valve,
  but with console for motor drive including suitable servo motor
• function open/close, voltage 24V, without return spring
  (with return spring upon request)

Electronic reheater coil

• available for all SupraBox COMFORT (V)
• round connections
• for post-tempering of the supply air
• installation kit consisting of electric heater coil and duct temperature sensor
• available in different capacities
• integrated continuous electronic control with thyristor,
  allowing for capacity control from 0-100%
• actuation of the control electronics via the SupraBox via 0...10V
• caution: only suitable for indoor installation

PTC electronic pre-heater

• available for SupraBox COMFORT 1000 V
• for optimum antifreeze protection
• installation kit for installation in the outdoor air outlet
• PTC electronic pre-heater and duct temperature sensor
• integrated temperature sensor
• caution: only suitable for indoor installation

Electronic pre-heater

• available for SupraBox COMFORT 1600 V - 2000 V
• for optimum antifreeze protection
• coil similar to the electronic repeaters
• switching on and off via SupraBox 
  (integrated contactor)
• caution: only suitable for indoor installation

PWW Reheater

• available for all SupraBox COMFORT (V)
• transitions round
• for post-tempering of the supply air
• available per size with 2 or 4 pipe series
• galvanised steel frame
• blade spacing 2.0 mm, equivalent to DIN EN 13053
• antifreeze protection thermostat already mounted on coil frame

PKW Aftercooler

• available for all SupraBox COMFORT (V)
• transitions round
• for post-tempering of the supply air
• galvanised steel frame
• condensate tub aluminium AlMg3, condensate drain 1/2"
• blade spacing 2.5 mm, equivalent to DIN EN 13053
• Droplet separator optionally available

Replacement filter, exhaust filter ISO ePM10 ≥ 50 % (M5)

• available for all SupraBox COMFORT

Replacement filter, supply air filter ISO ePM1 ≥ 50 % (F7)

• available for all SupraBox COMFORT

Freezing of the heat exchanger

The surface temperature of the counterflow plate heat exchanger decreases with falling outside temperatures. If this falls below the dew point of the exhaust air, condensate drops on the plates of the heat exchanger. The dew point depends on the absolute humidity content of the air. Although the condensation energy of the water increases the efficiency of the counterflow plate heat exchanger that is related to the air supply, freezing takes place here under certain conditions.

If the units of the SupraBox COMFORT series are used in applications where the exhaust air is only slightly humid, heat recovery can work well below -10°C without losses. If the exhaust air comes from wet rooms, however, antifreeze protection may already be needed at -5°C and below.

Since the average outdoor temperature in Central Europe is typically above 0°C during the heating season, there are only a few days a year where antifreeze protection is necessary. Thus, efficiency rating reductions in this area have a diminishing impact on the efficiency rating of the unit over the whole year.

Intelligent 3-sequence defrosting concept

All compact air handling units in the SupraBox COMFORT series include an intelligent 3-sequence defrosting concept. The special feature here is that the integrated bypass of the equipment is NOT used to defrost the counterflow plate heat exchanger. An expensive, highly dimensioned reheater is not needed because the heat recovery is not bypassed.

Depending on the settings done during the commissioning as well as the accessories used, up to 3 sequences are available to defrost the counterflow plate heat exchanger. These are explained as follows.

The counterflow plate heat exchanger is monitored for freezing using a differential pressure switch. If the heat exchanger freezes, this is detected by the differential pressure switch and the defrosting operation is initiated automatically by the control.

During commissioning, the antifreeze strategy to be used can be defined (sequences).

1. If an imbalance of the fans is allowed (adjustable via keypad), the supply air fan is reduced by 30% in the event of freezing to generate defrosting from the warmer exhaust air.
2. If an electronic preheating is connected (accessory) and released (adjustable via keypad), this is activated in the event of freezing to preheat the outside air and thus defrost the heat exchanger.
3. If both options have been released, the supply air will be reduced first. If this is not sufficient, the preheating is activated after 5 minutes.
4. If neither measure is effective or none of the measures are possible (missing release), the SupraBox COMFORT is disabled and an alarm is displayed. After 10 minutes, the SupraBox COMFORT restarts the fans automatically and the sequences are "executed" again. An acknowledgement of the alarm is not necessary.

Antifreeze protection - preheating for prevention

Optionally, the preheating can be used preventively by setting the control unit of the SupraBox COMFORT unit. If this is the case, the pre-heating is already switched on at an adjustable outdoor air temperature to prevent the heat exchanger freezing.

Duct silencer

• available up to SupraBox COMFORT 2000 H
• round connections
• outer casing and perforated inner duct of galvanised sheet steel
• sound dampening 50 mm
• socket with lip seal
• for direct integration into the pipe system

Flexible connections

• available up to SupraBox COMFORT 2000 H
  (insulation connection mounted as standard on SupraBox COMFORT 3500 H and 5000 H)
• round connections
• for decoupling the SupraBox to the duct system
• complete set consisting of 4 pieces
• made of galvanised steel and silicone-free PVC fabric
• the right connection for standard spiral ducts
• T-lip seal for quick and tight connections

Manually-operated shut-off valve

• available up to SupraBox COMFORT 2000 H
• round connections
• tight fitting, tightness category 4 behind closed baffle
• damper blade is made of doubled sheet steel and has a gasket
  of EPDM rubber placed in between the blades which rests
  on the inside of the valve sleeve when closed

Motor-driven shut-off valve

• available for all SupraBox COMFORT
• round connections ; (SupraBox COMFORT 3500 H and 5000 H square connections)
• tight fitting, tightness category 4 behind closed baffle
  (tightness category 2 with shut-off valve for SupraBox COMFORT 3500 H and 5000 H)
• design as manually operated shut-off valve,
  but with console for motor drive including suitable servo motor
• function open/close, voltage 24V, without return spring
  (with return spring upon request)

Electronic reheater coil

• available up to SupraBox COMFORT 3500 H
• round connections ; (SupraBox COMFORT 3500 H square connections)
• for post-tempering of the supply air
• installation kit consisting of electric heater coil and duct temperature sensor
• available in different capacities
• integrated continuous electronic control with thyristor,
  allowing for capacity control from 0-100%
• actuation of the control electronics via the SupraBox via 0...10V
• caution: only suitable for indoor installation

PTC electronic pre-heater

• available for SupraBox COMFORT 800 H and 1100 H
  (from SupraBox COMFORT 1500 H electronic pre-heater as installation kit)
• for optimum antifreeze protection
• installation kit for installation in the outdoor air outlet
• PTC electronic pre-heater and duct temperature sensor
• integrated temperature sensor
• caution: only suitable for indoor installation

Electronic pre-heater

• available for SupraBox COMFORT 1500 H - 5000 H
• for optimum antifreeze protection
• coil similar to the electronic repeaters
• switching on and off via SupraBox
  (integrated contactor)
• caution: only suitable for indoor installation

PWW Reheater

• available for all SupraBox COMFORT 
  (transitions round; in SupraBox COMFORT 3500 H and 5000 H without transitions)
• for post-tempering of the supply air
• available per size with 2 or 4 pipe series
• galvanised steel frame
• blade spacing 2.0 mm, equivalent to DIN EN 13053
• antifreeze protection thermostat already mounted on coil frame

PKW Aftercooler

• available for all SupraBox COMFORT 
  (transitions round; in SupraBox COMFORT 3500 H and 5000 H without transitions)
• for post-tempering of the supply air
• galvanised steel frame
• condensate tub aluminium AlMg3, condensate drain 1/2"
• blade spacing 2.5 mm, equivalent to DIN EN 13053

Replacement filter, exhaust filter M5

• available for all SupraBox COMFORT

Replacement filter, supply air filter F7

• available for all SupraBox COMFORT

Freezing of the heat exchanger

The surface temperature of the counterflow plate heat exchanger decreases with falling outside temperatures. If this falls below the dew point of the exhaust air, condensate drops on the plates of the heat exchanger. The dew point depends on the absolute humidity content of the air. Although the condensation energy of the water increases the efficiency of the counterflow plate heat exchanger that is related to the air supply, freezing takes place here under certain conditions.

If the units of the SupraBox COMFORT series are used in applications where the exhaust air is only slightly humid, heat recovery can work well below -10°C without losses. If the exhaust air comes from wet rooms, however, antifreeze protection may already be needed at -5°C and below.

Since the average outdoor temperature in Central Europe is typically above 0°C during the heating season, there are only a few days a year where antifreeze protection is necessary. Thus, efficiency rating reductions in this area have a diminishing impact on the efficiency rating of the unit over the whole year.

Intelligent 3-sequence defrosting concept

All compact air handling units in the SupraBox COMFORT series include an intelligent 3-sequence defrosting concept. The special feature here is that the integrated bypass of the equipment is NOT used to defrost the counterflow plate heat exchanger. An expensive, highly dimensioned reheater is not needed because the heat recovery is not bypassed.

Depending on the settings done during the commissioning as well as the accessories used, up to 3 sequences are available to defrost the counterflow plate heat exchanger. These are explained as follows.

The counterflow plate heat exchanger is monitored for freezing using a differential pressure switch. If the heat exchanger freezes, this is detected by the differential pressure switch and the defrosting operation is initiated automatically by the control.

During commissioning, the antifreeze strategy to be used can be defined (sequences).

1. If an imbalance of the fans is allowed (adjustable via keypad), the supply air fan is reduced by 30% in the event of freezing to generate defrosting from the warmer exhaust air.
2. If an electronic preheating is connected (accessory) and released (adjustable via keypad), this is activated in the event of freezing to preheat the outside air and thus defrost the heat exchanger.
3. If both options have been released, the supply air will be reduced first. If this is not sufficient, the preheating is activated after 5 minutes.
4. If neither measure is effective or none of the measures are possible (missing release), the SupraBox COMFORT is disabled and an alarm is displayed. After 10 minutes, the SupraBox COMFORT restarts the fans automatically and the sequences are "executed" again. An acknowledgement of the alarm is not necessary.

Antifreeze protection - preheating for prevention

Optionally, the preheating can be used preventively by setting the control unit of the SupraBox COMFORT unit. If this is the case, the pre-heating is already switched on at an adjustable outdoor air temperature to prevent the heat exchanger freezing.

Criteria	A+	A	B
Air velocity class without thermal air treatment	V5	V6	V7
Air velocity class with air heating and / or heat recovery	V4	V5	V6
Air velocity class with additional functions	V2	V3	V5
Electric power consumption class	P2	P3	P4
Heat recovery classes (4,000 - 6,000 hours per year)	H1	H2	H3

Classes	Velocity [m/s]
V1	max. 1,6
V2	> 1,6 to 1,8
V3	> 1,8 to 2,0
V4	> 2,0 to 2,2
V5	> 2,2 to 2,5
V6	> 2,5 to 2,8
V7	> 2,8 to 3,2
V8	> 3,2 to 3,6
V9	> 3,6

PTC electronic reheater coil, retrofitting set

• available for SupraBox DELUXE 500 V and 750 H
• necessary for low ambient temperatures
• warms the supply air at low temperatures by up to 3 K after
• simple retrofit in the supply air possible

External room temperature sensor

• available for SupraBox DELUXE 500 V and 750 H
• necessary if supplied operating part (integrated room temperature sensor)
  cannot provide meaningful values (e.g. positioning in the window)

Design door

• available for SupraBox DELUXE 750 H (standard with SupraBox DELUXE 500 V)
• optical element as pure accessory
• coated in RAL 9006 as standard

Replacement filter, M5 exhaust filter

• available for SupraBox DELUXE 500 V and 750 H

Replacement filter, F7 supply air filter

• available for SupraBox DELUXE 500 V and 750 H