Stulz Air Booster 2 User manual

Index IT30I
Issue 10.2018
Air Booster 2
Operating instructions
Fan assisted floor tiles for data centers
230/1/50-60

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EN/10.2018/IT30I © STULZ SpA – all rights reserved
STULZ SpA
Via Evangelista Torricelli n.3
37067 Valeggio sul Mincio VR
ABOUT STULZ GMBH
Since it was founded in 1947, the STULZ company has
evolved into one of the world’s leading system suppliers of
air-conditioning technology.
Since 1974 the group has seen continual international
expansion of its air conditioning technology business, spe-
cialising in A/C for data centres and telecommunications
installations.
STULZ has ten production plants (2 in Germany, Italy, the
USA, Great Britain, Spain, 2 in China, Brazil and India) and
twenty subsidiaries (in Germany, France, Italy, Great Britain,
Belgium, Brazil, the Netherlands, New Zealand, Mexico, Aus-
tria, Poland, Spain, Singapore, China, India, Indonesia, South
Africa, Sweden, Australia and the USA).
The company also co-operates with sales and service part-
ners in over 140 other countries, and therefore boasts an
international network of air-conditioning specialists.

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Air Booster 2
Dear customer,
thank you for having chosen Air Booster 2 from STULZ.
It's the result of decades of research and design studies, with a fine search of materials and
technologies to obtain an high quality unit.
The CE mark guarantees that the STULZ products satisfy the requirements of the European
Machinery Directive for safety.
The level of quality is constantly checked at every stage, from design to production, making the
STULZ products synonymous of SAFETY, QUALITY and RELIABILITY.
For further information concerning our products and services visit our website :
www.stulz.com

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STULZ reserves the right to update the product and the relevant manual without having to update products
and manuals sold previously except under exceptional circumstances.
Contact your local STULZ partner when requesting or receiving any updates of instruction manuals or cor-
rections when which are considered to be integral parts of the manual.

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Table of contents
1.Introduction...........................................................................................................6
1.1.Symbols used in this manual .................................................................................................................... 6
1.2.Attachments................................................................................................................................................... 6
2.Safety directions ...................................................................................................7
2.1.Introduction .................................................................................................................................................... 7
2.2.General rules.................................................................................................................................................. 7
2.3.Residual hazard............................................................................................................................................. 8
2.4.Labels............................................................................................................................................................... 8
2.5.Intended and non-intended use............................................................................................................10
3.Handling and storage ..........................................................................................10
3.1.Unit receipt ...................................................................................................................................................10
3.1.1.Precautions when handling the unit............................................................................................11
3.2.Storage ..........................................................................................................................................................12
4.Description .........................................................................................................13
4.1.Coding ............................................................................................................................................................13
4.2.Component lay-out and operating principle.....................................................................................13
4.3.Components.................................................................................................................................................15
4.4.Electrical components of protection and control............................................................................15
5.I/O Controller ......................................................................................................16
5.1.User interface..............................................................................................................................................16
5.1.1.Quick display menu (actual value display).................................................................................17
5.1.2.Basic display and setpoint..............................................................................................................18
5.1.3.Selection menu...................................................................................................................................19
5.1.4.Lock and unlock the keypad .........................................................................................................19
5.2.Parameters ..................................................................................................................................................20
5.3.Setting the operating mode....................................................................................................................21
5.3.1.Temperature control ........................................................................................................................22
5.4.System states ..............................................................................................................................................22
5.5.Alarms.............................................................................................................................................................23
5.6.Modbus RTU datapoint............................................................................................................................25
6.Technical data .....................................................................................................26
6.1.Application limits.........................................................................................................................................26
6.2.Technical data .............................................................................................................................................26
6.3.Drawings........................................................................................................................................................27
7.Installation...........................................................................................................27
7.1.Adjusting the airflow direction ...............................................................................................................29
7.2.Electrical Connections..............................................................................................................................30
8.Start-up ...............................................................................................................31
8.1.Commissioning............................................................................................................................................31
8.2.Checks after commissioning .................................................................................................................31
8.3.Switching off ................................................................................................................................................32
9.Maintenance ........................................................................................................32
9.1.Safety instructions .....................................................................................................................................32
9.2.Preventive maintenance schedule .......................................................................................................33
9.2.1.General cleaning................................................................................................................................33
10.Troubleshooting ................................................................................................34
11.Uninstalling and disposal of the unit .................................................................34
12.Accessories .......................................................................................................35
12.1.Light duty grille - ACTBALDG ............................................................................................................36
12.2.Heavy duty grille - ACTBAHDG..........................................................................................................36
12.3.Installation of the grille ..........................................................................................................................37

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1. Introduction
This manual reflects the state of the art existing at the time the product is marketed and shall not be
considered unsuitable merely because it has not been updated following developments in design
and manufacturing methods. Air Booster 2 units are meant to supply a suitable flow of cold air to all
servers to ensure their reliability and optimum working conditions.
Air Boosters are a solution for server rooms whose original layout, load distribution or pressure
conditions in the raised floor have been modified, for example, by additional installations. In these
cases, Air Boosters can be used to adapt the air distribution to the new requirements.
These operating instructions are intended for the following authorized personnel:
• USER: he must know and apply the safety directions and the instructions contained in the present
manual, for correct use of the unit.
• INSTALLER: The unit must be installed that the airflow is directed to the server racks. In doing so,
ensure that installation is in compliance with local safety regulations and instructions contained in
the present manual.
• MAINTENANCE TECHNICIAN: he's a technician authorized by the manufacturer for the start-up
of the unit, technical assistance, ordinary and extraordinary maintenance, reparations.
The qualified personnel consists of professional figures authorized by the safety responsible to
do the activities listed above, due to their training, education, experiences, as well as their specific
knowledge of safety work rules and injury prevention.
INFORMATION
The manufacturer is not responsible for an misuse of the unit, as well as for non-authorized
modifications and for the inobservance of instructions on this manual. The occurring of any of
the conditions above immediately invalidates guarantee coverage for the product.
This manual must be kept by the customer and made available to the installation, commissioning,
use and maintenance personnel.
1.1. Symbols used in this manual
DANGER RISK OF INJURY FOR OPERATOR AND
POSSIBILITY OF DAMAGING THE UNIT
ATTENTION INFORMATION OR WARNING OF CAUTION
IN CARRYING OUT A PROCEDURE
INFORMATION IMPORTANT INFORMATION
1.2. Attachments
The following document is attached to this manual, as its integral part:
• Use and maintenance manual part 2, which contains the electrical drawing and the conformity
declaration UL/CE of the unit.

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2. Safety directions
These operating instructions contain basic information which is to be complied with for installation,
operation and maintenance. They must therefore be read and complied with by the fitter and the
responsible trained staff/operators before assembly and commissioning. They must be permanently
available at the place where the system is used.
2.1. Introduction
This Air Booster 2 unit has been designed and built for a professional use according to applicable
regulations. Please check the complete list of applicable regulations in the attached CE and UL
conformity declaration.
The unit is in conformity with the following CE Directives:
• EN6100062 and EN6100063 - Electromagnetic compatibility
• EN60335 Safety of electrical appliances
It's necessary to respect the regulations of the Country where the product is installed.
2.2. General rules
DANGER
• Works have to be carried out by competent staff only.
• Observance of regulations for accident prevention.
• Stay out of danger when lifting and setting off the unit.
• Safety devices may not be bypassed.
• Respect the corresponding EN and IEC standards for the electric connection of the unit and
observe the conditions of power supply companies.
• Switch off the voltage from the unit when working on it.
ATTENTION
• Observe the national regulations of the country where the unit will be installed.
• For transport, installation, either ordinary or extraordinary maintenance, operators and
maintenance people must wear individual protection devices (i.e. gloves, glasses, helmet,
shoes), according to the indications of safety manager and applicable regulations.
• The unit may only be used to cool according to the STULZ specification.
• Before any maintenance operation, read and follow instructions in the corresponding chapter.
INFORMATION
• Any special opening tools have to be placed in a visible location nearby the unit.

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2.3. Residual hazard
During transport and installation
Area Danger Risk Preventive measures
Under
the unit
Defective lifting system of the unit
that causes its fall.
Contusions,
traumas
Keep away from dangerous area during handling of the unit.
Electrical
box
Supply cables under voltage. Electrocution Check that the power supply of the electrical box has been
insulated. Remain electrically insulated from the ground. Wear PPE.
During start-up and operation
Area Danger Risk Preventive measures
Near the unit Launch of tools and various hardware (nuts,
screws, etc.) that can accidentally fall on the
fans blades.
Contusions,
traumas
In the installation phase, be sure to remove
tools and other installation materials. Wear PPE.
Near the unit Aspiration and following expulsion from the
fans of objects, dusts and substances present
on the installation site.
Contusions,
traumas,
inhalation of dusts
Clean installation area. Wear PPE.
In contact with
the unit
Electrical connection against regulations and
missing ground connection.
Electrocution Remain electrically insulated from the ground.
Wear PPE.
Near the unit
(electrical box,
supply cables)
Short circuit; wrong dimensioning of the
cables or of the general breaker.
Electrocution, fire,
forming of acid
vapours
Check the fixing of cables in the terminals:
select adequately supply cables and main
switch. Wear PPE.
During maintenance
Area Danger Risk Preventive measures
Electrical box Powered line even if the switch
of the machine is on OFF.
Electrocution Check the insulation of the power supply from the
electrical panel. Be sure that the main switch will not be
re-activated during maintenance.
Operation of the fans
during maintenance
Contact with moving surfaces. Cuts, abrasions,
bruises
Be sure to remove power during maintenance and wait the
stop of the moving parts. Wear PPE.
Hot components Contact with hot surfaces. Burns Wear PPE
During uninstalling
Area Danger Risk Preventive measures
Electrical
box
Powered line even if the switch
of the machine is on OFF.
Electrocution Check the insulation of the power supply from the electrical panel.
Be sure that the main switch will not re-activated during maintenance
2.4. Labels
DANGER: MOVING
COMPONENTS DANGER: HIGH VOLTAGE
DANGER: HOT COMPONENTS LIFT THE UNIT USING
THESE HANDLES

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Technical name-plate
The unit can be correctly identified by the technical name-plate. The name-plate is located on the
external casing of the unit, on the side.
ATTENTION
For any assistance or information concerning the unit described in this manual, knowledge of its
serial number is essential.
Labels on the packaging of the unit, on both sides
CE marked UL marked
Maximum 5
units one above
the other
Keep dry Position Fragile
Do not step Lift cart here
Unit type
Serial no.
Unit type
Serial no.

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2.5. Intended and non-intended use
Intended use
The Air-Booster2 is used to control airflow and is designed for indoor installation.
Any use beyond this is not deemed to be use as intended. STULZ is not liable for any damage
resulting from such misuse. The operator alone bears the risk.
INFORMATION
The use of Air Booster 2 for hotspot cooling requires that the airflow provided by the air
conditioners is sufficient for the entire room. To make this sure we recommend the use of a
raised floor pressure management.
DANGER
The units may not be used or transported in a position other than that for which they have been
designed. STULZ declines all liability deriving from failure to observe the above.
Non-intended use
The unit cannot be installed in the following areas:
• With strong heat radiation;
• With strong magnetic fields;
• With free flames;
• With fire risk;
• With inflammable products;
• With explosive atmosphere;
• With saline atmosphere;
• With aggressive atmosphere.
For any doubt, please consult the manufacturer.
3. Handling and storage
3.1. Unit receipt
STULZ products are delivered ex-works. All units have been individually inspected in all their
components and been carefully packaged before the delivery. Immediately inspect the unit upon
receipt of the goods.
• The delivery note can be found on the A/C unit when delivered.
• The shipment is make ex works, in case of shipment damages, please assert your claim towards
the carrier.
• Hidden damage, that are verified after removal the packing, must always be notified to the shipper
by registered letter within 8 days of receipt of the goods.
• Before throwing the packaging away check that it does not contain any documents or parts of the
machine.
INFORMAZIONI
When delivery is accepted, the unit is to be checked against the delivery note for completeness
and checked for external damage which is to be recorded on the consignment note in the
presence of the freight forwarder.

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If installation of the product is not required immediately or the product needs to be forwarded to
its final destination, replace it in its packing, after inspecting it, and store it in a safe place. As an
environmental concern, we recommend to recycle the packing cartons and to separate them from
any plastic.
INFORMATION
With ex-works delivery conditions, carrier is the sole responsible for any damage caused during
transport. STULZ is not responsible for damages to the goods caused by the carrier, but will do
everything in its power to assist clients on those situations.
This product cannot be returned without prior approval of STULZ. For any assistance, please
consult your local STULZ partner.
3.1.1. Precautions when handling the unit
Handle these units, when they are packaged and complete of pallet, using a fork lift. When they are
not packaged, use a hoisting machine equipped with cables or chains suited for supporting their
weight or use the handles inside the unit (the grill has to be removed to access the handles).
ATTENTION
Risk of personal injuries during materials handling
Material handling and unpacking must be done only by trained personnel with suitable individual
protection devices (i.e. gloves, glasses, helmet, shoes)

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LIFTING AND TRANSPORT
DANGER
Capacity of lifting device must be appropriate for the weight of the unit.
Load must be balanced to avoid tilting.
Avoid offhanded or rough manoeuvres.
Don’t lay other objects upon the unit.
When removing the grill take care of avoid pinching under its weight
ATTENTION
Risk of unit deformation
Don’t move the unit on rolls, or with forklift after removing the pallet, to avoid any structural
deformation.
3.2. Storage
INFORMATION
Standard packing doesn't protect the unit from rain and bad weather
Standard packing is not suitable for seafreight
Standard packing is not suitable for airfreight
If the unit is stored before the installation, comply with the following instructions:
• Don't expose to direct solar radiations;
• Store the unit with its original packaging.
Please see the ambiental condition for storage in paragraph "Application limits".
Removal of packing
• Remove packing without damaging the unit: remove the box and the pallet under the unit;
• Recover any document or component inside the packing;
• Keep original packing (pallet and protections) for future shipments.
ATTENTION
Use original packing to ship the unit to any other destination
If packing disposal is necessary, we remind to dispose different materials suitably

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BAF 60 F D 2 20 -LD
© STULZ SpA . – all rights reserved EN/10.2018/IT30I
4. Description
4.1. Coding
Product type
Size
Configuration
Type of control
Application
Power supply
Grille
HD= Heavy duty
LD = Light Duty
20 = 230V/1ph/5060 Hz
2 = For floor mounting
D = With control inside
N = No control inside (must be connected to ACTPCMP)
F = Fan + Air deflector
600600 mm
Booster Air Fan
4.2. Component lay-out and operating principle
In conventional raised-floor systems, the cold air required to cool the servers flows in front of the
server racks via perforated plates from the raised floor. The air volume depends on the pressure in
the raised floor and the degree of perforation of the floor tile.
If this system can not deliver the airflow required by the servers to where it is needed, the floor tile
can be replaced by an Air Booster 2. The reasons for an adjustment of the air supply can be caused
for example by changes in the configuration of the rack (conversion to high density racks) or by
changes in the raised floor which lead to pressure drops which were originally not calculated.
Air Booster 2 delivers exactly the required amount of cold air to the server rack using variable-speed
EC fans. The air stream can be adjusted to two zones per server rack by means of the manually
adjustable air conduction fins. An Air Booster 2 consists of a fan module and a grille. Information
about the different grilles can be found in the chapter grilles.

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Components lay-out
Operating methods
Temperature control
For Air Booster 2 with their own control (type BAF60FD220), the control of the fan speed depends
on the measured temperatures. Three temperature sensors have to be installed in the high part, the
middle and in the lower part of the rack. The fan speed of the Air Booster 2 is proportional to the
average temperature of the three temperature sensors of the rack, or is proportional to the maximum
temperature detected from the sensors, according to the controller settings. According to this
working mode, the unit has to have the control inside and it works according to the basic principle
that the air delivered to the rack is directly proportional to the desired set point. The controller
ensures smooth transition of fan speed with reference to the set point. Air Booster 2 floods the cold
aisle on the front of the server rack with sufficient cold air as desired.
Pressure control (optional)
To enable the pressure control mode is an external pressure control module (option ACTPCMP)
in combination with an Air Booster 2 without own control (type BAF60FN220) required. The fan
speed is proportional to the difference between the pressure set point and the value measured by
the module and it's controlled by the accessory ACTPCMP. The server temperature management
requires constant pressure conditions in the data centre. In the best of cases, the air is conveyed
from the cold aisle exclusively by the server fans through the rack and not by a pressure difference
between cold aisle and warm aisle.
The pressure control is a pressure limitation, to protect the fans integrated in the servers against
overpressure.
Damper
Keypad
Fan
Connections interface
Main switch
Electrical box

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4.3. Components
Structure
These machines are built using self-supporting panels made of painted galvanised sheet metal
to guarantee good corrosion resistance (not suitable for corrosive and saline environments). The
internal components of the unit can be accessed by simply removing the upper grill.
Fan
The fan is an infinitely variable axial fan with EC drive and PP coated sheet steel blades.
The bearings of the fans are lifetime lubricated and do not need maintenance.
4.4. Electrical components of protection and control
Contactors
They control the motors by operating with auxiliary voltage. They refer to IEC94741 standards.
Automatic circuit breakers
They protect against short circuits and excessive motor current. They have adjustable thermal and
magnetic triggering devices.
Main switch
A main switch is located on the top of the unit, under the grille. It's used to disconnect main power
supplyto the unit.When switched off, it interrupts power supplytothe unit circuits from it downstream.
Temperature probes
Three NTC temperature probes are connected to analogue inputs of electronic controller for units
with controller on board and they have to be positioned in the lower part, in the middle and in the
high part of the rack.
Temperature probe 1
Temperature probe 2
Temperature probe 3

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5. I/O Controller
Air Booster 2 of type BAF60FD220 are equipped with the controller described in the following.
In the factory setting, Air Booster 2 operates on temperature control. Once the system is in
"System ON" mode, the unit controls fan speed automatically, in dependence of the measured
temperature values. If the measured value exceeds the set point, the fan speed increase, if the
temperature difference between set point and measured value decreases, the fan speed is reduced
proportionally up to the minimum speed. For units with controller on board, the microprocessor-
based electronic board is equipped with a set of terminals which are necessary to connect the
board to the controlled devices (e.g. the fan). Software with working logic and parameter settings
are safely stored in the EEPROM so that they remain permanently in case of power failure. The
controller is housed inside the electrical box. A keypad is connected to display information about
working conditions, status of the unit and alarms, if any. The controller has an RS485 interface for
communication with a building management system. The used protocol is ModBus RTU.
Technical data of the controller:
• Power Supply: 230 Vac 10% - 50/60 Hz
• Power consumption: 10 VA max
• Communication protocol: Modbus – RTU
• Data storage on non-volatile memory (EEPROM)
• Operating temperature: -20  60°C
• Storage temperature: -40  90°C
• Relative humidity < 90%
5.1. User interface
Technical data of the user interface:
• Dimensions 7536 mm; depth 23 mm;
• Protection rating IP20;
• Front protection rating IP65;
• Display: 3 keys, blue LED and height 14,2 mm.
SET
View / Edit the set point.
It selects a parameter or
confirms a value.
ON/OFF
Turns the unit on and off
Function key UP
• To scroll through the parameters or
increase their value.
• Quick menu access
Function key DOWN
• To scroll through the parameters or
decrease their value.
Display

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Key Combinations Meaning of combinations
+
Lock / Unlock the keypad. See paragraph "5.1.4. Lock and unlock the keypad".
+
• To go into programming mode.
• In parameter programming mode: Pr2 level ("Selection menu") is used to change the visibility of the
displayed parameter in level Pr1 (first menu level).
• If the decimal point is on while the parameter’s label is displayed, this means that the parameter is visible in
programming level Pr1 (first menu level).
+
Exit from programming mode.
Display - The values of the parameters and the operating mode are shown on the display
LED MODE MEANING LED MODE MEANING
ON The unit is in ‘System ON’ ON Cooling is requested,the unit operates according tothe set parameters.
ON An alarm occurred Flashing During delay upon start-up (ton) and delay upon shutdown (toF)
ON Unit of measurement Flashing Programming
Unit of measurement
The instrument allows you to set the unit of measurement for the display and settings.
Label Description Range
°C/°F (appears on the display) Celsius, Fahrenheit °C(0) - °F(1)
rES Resolution (only for temperature in °C):
decimal , integer dE(0) - in(1)
PMU (doesn’t appear on the display) Unit of measurement of the Pressure Bar(0) - PA(1)
Lod Display probe selection by default
b1 = probe P1 (upper temperature)
b2 = probe P2 (middle temperature)
b3 = probe P3 (lower temperature)
b4 = air pressure probe
Avr = average temperature of the enabled probes
MAu = Max temperature value of the enabled probes
5.1.1. Quick display menu (actual value display)
The quick display menu is used to display actual values of the following inputs:
1. Probe B1 value (upper temperature)
2. Probe B2 value (middle temperature)
3. Probe B3 value (lower temperature)
4. Temperature probe average value (Avr)
5. Temperature probe max value (MAu)
6. Probe B4 value (air pressure probe)
7. Analogue output value AO1 (1st Analogue Output) and AO2 (2nd Analogue Output)
8. Digital input value In1 (1st Digital Input) and In2 (2nd Digital Input)
Starting from the main screen press function key UP to enter the quick display menu, from there
follow the procedure below:
1. To go through the list, press UP and DOWN;
2. Press SET to display the corresponding value of the resource. When it's displayed the value of the
parameter in the quick display menu, it's not possible to do other operations.
3. Press SET to go back to the list.
4. Press SET + UP to go back to the main screen.

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UAF %
LAF %
SPt + HYSPtSPt - HL tIP
EN/10.2018/IT30I © STULZ SpA – all rights reserved
INFORMATION
• The temperature values (B1, B2, B3) are expressed in Celsius or Fahrenheit degrees;
• The pressure value (B4) is expressed in Bar or PA;
• Flashing “Err” label indicates that there is a probe failure;
• “nu” (not used) label indicates that the probe is not enabled or that the analogue output / digital
input is not used by any function;
• A value from 0% to 100% expresses the output value of the resource, for analogue outputs
AO1 and AO2;
• “OFF” label indicates that the digital input (In1, In2) is not enabled, while “ON” indicates that the
digital input (In1, In2) is enabled.
5.1.2. Basic display and setpoint
The temperature (SPt) or pressure (SPb) setpoint is displayed according to the type of control,
temperature or pressure control. If there is no operation for at least 30 seconds, the display of the
controller returns automatically to basic display.
5.1.2.1. Controller logic and main parameters
Fan Speed
UAF Maximum fan speed (100%)
LAF Minimum fan speed (20%)
SPt Temperature setpoint (25°C)
HL Temperature switch-off hysteresis (3°C)
HY Temperature proportional band (10°C)
tIP Calculated temperature
The factory setting and the complete parameter list is provided in chapter 5.2.
5.1.2.2. Changing the setpoint
Make sure that the keypad is not locked (see paragraph 5.1.4). To modify the setpoint, follow the
procedure below:
1. Press SET;
2. The temperature (SPt) or pressure (SPb) setpoint is displayed and °C/°F led starts to flash;
3. To change the value, press UP and DOWN keys;
4. To save new setpoint and return to the standard display, press SET or wait 30 seconds to exit the
programming.

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5.1.2.3. Changing the value of a parameter
Make sure that the keypad is not locked (see paragraph 5.1.4). To change the value of a parameter
proceed as follows:
1. To access the programming mode, hold down SET + DOWN key for few seconds (°C/°F led
flashes);
2. Select the desired parameter;
3. Press SET to display the value;
4. Change it with UP and DOWN keys;
5. Press SET to save the new value and go to the next parameter.
6. To exit, press SET + UP key when a parameter is displayed, or wait 30 seconds without pressing
any key.
INFORMATION
The new set value is saved even when you exit without pressing SET.
5.1.3. Selection menu
Via the selection menu, you can navigate to the parameters which you want to read, change or
transfer to the quick display menu.
Access to the hidden menu (Pr2)
To access to the hidden menu, proceed as follows:
1. Access to programming by pressing SET + DOWN key for 3 seconds (°C/°F led flashes);
2. When a parameter is displayed, hold down SET + DOWN key for more than 7 seconds. ‘Pr2’
message will appear immediately on the display, followed by temperature proportional band
parameter (HY). You are now in the hidden menu;
3. Select the desired parameter;
4. Press SET to display the value;
5. Change it with UP and DOWN keys;
6. Press SET to save the new value and go to the next parameter.
7. To exit, press SET + UP key when a parameter is displayed, or wait 15 seconds without pressing
any key.
INFORMATION
After 30 seconds, the new set value is saved even when you exit without pressing SET.
Move a parameter from the hidden menu on the first level and vice versa.
Each parameter in the hidden menu can be removed or entered into the first menu level (Pr1) by
pressing SET + DOWN key. If a parameter is in the first menu level (Pr1), when you are in the hidden
menu the decimal point is on.
5.1.4. Lock and unlock the keypad
To lock the keypad proceed as follows:
1. Hold down UP and DOWN keys for few seconds, until “POF” starts to flash. Press SET to finish
setting.
2. Atthis point, the keypad is locked. Whenthe keypad is locked, the quick display menu is shown, but
it's not possible to make modifications. With the key SET you can switch between the display of
the actual value and the setpoint even in the locked mode.
3. If a key (not up arrow) is pressed for more than 3 seconds, “POF” appears.

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AIR BOOSTER 2
EN/10.2018/IT30I © STULZ SpA – all rights reserved
To unlock the keypad: hold down UP and DOWN keys for few seconds, until “POn” starts to flash.
Manual reset after locking alarms
If the unit is locked, press DOWN key for 3 seconds to reset the unit. It allows MANUAL UNLOCK
function (manual reset of alarms) when the unit is locked due to:
• FAN BLOCKED alarm (at least 4 events in 4 hours)
• DAMPER BLOCKED alarm
• MOTOR BLOCKED alarm
• HIGH PRESSURE alarm
5.2. Parameters
Label Description Range Preset
value
SPt Temperature setpoint (Type 1) [LS ÷ US] 25°C
SPb Pressure setpoint (Type 2) [LSb ÷ USb] 20 Pa
LS Temperature setpoint lower limit °C [-40,0 ÷ SPt] °F [-40 ÷ SPt] 5°C
US Temperature setpoint upper limit °C [SPt ÷ 110,0] °F [SPt ÷ 230] 50°C
LSb Pressure setpoint lower limit Bar [0 ÷ SPb] PA [0 ÷ SPb] 10 Pa
USb Pressure setpoint upper limit Bar [SPb ÷ 50,0] PA [SPb ÷ 725] 80 Pa
Ctr Type of control tPr÷ PrS tPr (temperature control) ÷ PrS (pressure control) tPr
CMt Temperature control mode BAF (Air Booster Fan) ÷ BAM (Air Booster Modulator) BAF
CF Temperature unit of measurement: Celsius, Fahrenheit °C(0) - °F(1) °C
rES Resolution (only for T in °C): decimal , integer dE(0) - in(1) dE
PMU Unit of measurement of the Pressure Bar(0) - PA(1) PA
Lod Display probe selection by default
b1 = probe P1 (upper temp)
b2 = probe P2 (middle temp) / b3 = probe P3 (lower temp)
Avr = average temperature of the enabled probes
MAu = Maximum temperature value of the enabled probes
Avr
tIP Calculated temperature
b1 = probe P1 (upper temp)
b2 = probe P2 (middle temp) / b3 = probe P3 (lower temp)
Avr = average temperature of the enabled probes
MAu = Maximum temperature value of the enabled probes
Avr
HY Temperature proportional band °C [0,1÷ 25,5] °F [1 ÷ 45] 10°C
Int Integral time for the temperature adjustment 0 ÷ 999 (seconds) 0 sec
HL Temperature switch-off hysteresis °C [0,1÷ 25,5] 3°C
HP Pressure switch-off hysteresis Bar [0,1÷1,0] Pa [1 ÷ 10] 30 Pa
LAF Minimum speed with CMt = BAF 0 ÷ UAF 20%
UAF Maximum speed with CMt = BAF LAF ÷ 100 100%
LAM Lower operating limit with CMt = BAM 0 ÷ UAM 10%
UAM Upper operating limit with CMt = BAM LAM ÷ 100 100%
bPb Pressure proportional band Bar [0,1 ÷ 25,5] PA [1 ÷ 360] 20 Pa
Inb Pressure integral time 0 ÷ 999 (seconds) 0 sec
Lab Lower operating limit with Ctr = PrS 0÷UAb 10%
UAb Upper operating limit with Ctr = PrS LAb ÷100 100%
ton Delay upon start-up 0 to 255 seconds 0 sec
toF Delay upon shutdown 0 to 255 seconds 0 sec
ALL Low temperature alarm °C [-40,0 ÷ ALU] °F [-40 ÷ ALU] 5°C
ALU High temperature alarm °C [ALL ÷ 110,0] °F [ALL ÷ 230] 50°C
HLA Low temperature alarm hysteresis
(differential for low temp alarm to be restored) °C [0.1 ÷ 25,5] °F [1 ÷ 45] 2°C
HHA High temperature alarm hysteresis
(differential for high temp alarm to be restored) °C [0.1 ÷ 25,5] °F [1 ÷ 45] 2°C
ALd Temperature alarm delay (in normal mode) 0 to 255 seconds 20 sec
dAo Temperature alarm exclusion at power on 0 to 255 seconds 60 sec