Stulz C2020 User manual

C2020
INDEX 58
I/O CONTROLLER
OPERATING INSTRUCTIONS
Issue 07.2013
AIR CONDITIONING

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Table of contents
1.Introduction........................................................................................................................................................6
2.Hardware features .............................................................................................................................................6
2.1.Technical data .............................................................................................................................................7
2.2.SB7 board layout.........................................................................................................................................8
2.3.I/O assignment ............................................................................................................................................9
2.4.Communication .........................................................................................................................................13
2.5.User interface ............................................................................................................................................14
2.5.1.EO3 user interface (Stulz accessory ACTUKPD)...............................................................................14
2.5.2.CO3 user interface (Stulz accessory ACTKPDC1010H)....................................................................14
2.5.3.WIB1000.............................................................................................................................................15
3.Interfaces.........................................................................................................................................................16
3.1.Visualization on E03 User .........................................................................................................................16
3.2.Menu on E03 user .....................................................................................................................................17
3.2.1.Inserting and setting the passwords...................................................................................................17
3.2.2.Entering the menu..............................................................................................................................17
3.3.Visualization on C03 user (ACTKPDC1010H) ..........................................................................................18
3.4.Menu on C03 user.....................................................................................................................................20
3.4.1.Inserting and setting the passwords...................................................................................................20
3.4.2.Entering the menu..............................................................................................................................20
3.4.3.Parameter change and setting a string parameter.............................................................................22
3.4.4.User setup..........................................................................................................................................22
3.4.5.Manufacturer setup ............................................................................................................................23
3.4.6.I/O Setup ............................................................................................................................................31
3.4.7.Counters menu...................................................................................................................................37
3.4.8.Alarm history menu ............................................................................................................................37
3.4.9.System maintenance..........................................................................................................................38
3.4.10.Menu of WIB1000 board ..................................................................................................................38
4.Control functions..............................................................................................................................................39
4.1.Temperature control ..................................................................................................................................39
4.1.1.Cooling ...............................................................................................................................................42
4.1.2.Heating...............................................................................................................................................42
4.2.Dehumidification........................................................................................................................................43
4.2.1.Compressor logic ...............................................................................................................................43
4.2.2.Evaporator fan logic ...........................................................................................................................43
4.2.3.Heater logic ........................................................................................................................................44
4.3.Humidification............................................................................................................................................45
4.4.Freecooling................................................................................................................................................46
4.4.1.Function description ...........................................................................................................................47
4.4.2.Assisted freecooling ...........................................................................................................................48
4.4.3.HGB (Hot Gas Bypass) control ..........................................................................................................49

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4.5.Emergency ventilation management .........................................................................................................49
4.6.Manual control...........................................................................................................................................49
4.7.Automatic lead lag management (master-slave).......................................................................................51
4.8.Sequencing ...............................................................................................................................................53
4.8.1.General description ............................................................................................................................53
4.8.2.System installing instruction...............................................................................................................54
4.8.3.Sequencing with stand-by management mode ..................................................................................54
4.8.4.Lead lag management........................................................................................................................55
4.8.5.Cooling without freecooling conditions...............................................................................................55
4.8.6.Cooling with freecooling conditions....................................................................................................56
4.8.7.Heating...............................................................................................................................................57
4.8.8.Dehumidification with humidity switch................................................................................................58
4.8.9.Dehumidification with humidity probe.................................................................................................58
4.8.10.Humidification...................................................................................................................................58
4.8.11.Visualization .....................................................................................................................................59
4.9.Condenser fan speed management ..........................................................................................................60
4.9.1.Night mode.........................................................................................................................................61
4.9.2.Bypass of Condenser Fan Speed limitation .......................................................................................61
4.9.3.Triac Control.......................................................................................................................................61
4.9.4.Maximum EER function......................................................................................................................61
4.10.Evaporator fan speed management ........................................................................................................62
4.11.Control under high external/internal temperature....................................................................................63
4.12.Hot start function .....................................................................................................................................63
4.13.Control under high tc (or pc) (adaptive control).......................................................................................63
4.14.Soft control ..............................................................................................................................................64
4.15.Split air unit..............................................................................................................................................64
4.16.Offset correction ......................................................................................................................................65
4.17.Locked keypad ........................................................................................................................................65
5.Alarms .............................................................................................................................................................66
6.Supervision by .................................................................................................................................................70
6.1.PEMS Protocol (PE)..................................................................................................................................70
6.2.Stulz Protocol ............................................................................................................................................70
6.3.Modbus Stulz protocol...............................................................................................................................71
6.4.Modbus standard protocol.........................................................................................................................71
6.5.SAIA-BUS Protocol ...................................................................................................................................83
6.6.SNMP Communication ..............................................................................................................................83
6.7.WEB Monitoring ........................................................................................................................................88

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7.Software personalization for custom application .............................................................................................90
7.1.Custom 1 ...................................................................................................................................................90
7.2.Custom 2 ...................................................................................................................................................90
7.3.Custom 3 ...................................................................................................................................................90
7.4.Custom 4 ...................................................................................................................................................90
7.5.Custom 5 ...................................................................................................................................................90
7.6.Custom 6 ...................................................................................................................................................91
7.7.Custom 7 ...................................................................................................................................................91
7.8.Custom 8 ...................................................................................................................................................92
7.9.Custom 9 ...................................................................................................................................................92
7.10.Custom 10 ...............................................................................................................................................92
7.11.Custom 11 ...............................................................................................................................................92
7.12.Custom 12 ...............................................................................................................................................93
7.13.Custom 13 ...............................................................................................................................................93
7.14.Custom 14 ...............................................................................................................................................93
7.15.Custom 15 ...............................................................................................................................................94
7.16.Custom 16 ...............................................................................................................................................94
7.17.Custom 17 ...............................................................................................................................................94
7.18.Custom 18 ...............................................................................................................................................94
7.19.Custom 19 ...............................................................................................................................................94
7.20.Custom 20 ...............................................................................................................................................94
7.21.Custom 21 ...............................................................................................................................................95
7.22.Custom 22 ...............................................................................................................................................95
7.23.Custom 23 ...............................................................................................................................................95
7.24.Custom 24 ...............................................................................................................................................98
7.25.Custom 25 .............................................................................................................................................100
7.26.Custom 26 .............................................................................................................................................104
7.27.Custom 27 .............................................................................................................................................104
7.28.Custom 28 .............................................................................................................................................104
7.29.Custom 29 .............................................................................................................................................105
7.30.Custom 30 .............................................................................................................................................106
7.31.Custom 31 .............................................................................................................................................108

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1. Introduction
The object of this manual is a microprocessor controller for air conditioners used in Telecommunication area.
C2020 controller manages all main functions of air conditioning units with two basic purposes:
• Temperature control with cooling and heating. The cooling mode can be obtained either by the compressor
operating in a single refrigerant circuit or by introducing external air in free cooling mode. Heating requires the
activation of electrical heaters.
• Humidity control can be obtained either by enabling dehumidification mode or with the humidifier operation.
C2020 controller can control 1 refrigerating circuit and can be combined with two different versions of operator interface:
• User interface with 3-digit display to allow the change of parameters, such as: cooling set point, cooling band, etc.
• Service interface with 4 x 20 display to access all parameters and functions of the controller, used for commissioning
and servicing the air conditioner.
C2020 can control up to 3 DC evaporator fans, subject to parallel control. This means that fans will be controlled by the
same output, while each fan sends a speed indicating feedback signal towards the board (board input).
Up to five C2020 controllers can be connected in a LAN for sequencing, back-up and capacity management.
IMPORTANT NOTE: software functions and parameters described in this manual are generally valid for the
software version, which is designed to control units of different product families and configurations.Therefore,
unit features cannot be automatically inferred from software described in this manual. Features of a particular
product family are only the ones described on its specific manual.
Information in this manual refers to software version STUTL210.
2. Hardware features

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2.1. Technical data
• Voltage supply 24 ÷ 48 V DC, tolerance -15 ÷ +25%
• Nominal supply 24 Vdc
• Current absorption: 210 mA at 24 V, 310 mA at 48 V
• Microprocessor with 512 Kbyte flash memory
• Mother board SB7
• Analog inputs:
– 4 AN-IN PTC, range -35 ÷ +90 °C
– 3 AN-IN: 4 - 20 mA
• 13 non-insulated DIG-IN for free-contact kind inputs
• Analog outputs:
– 2 AN-OUT 0/10V non-insulated
– 3 AN-OUT 0/10V non-insulated for DC engines control with DC tachometric feedback
– 1 AN-OUT 230Vac, 4 A insulated for power control through phase-cut
• Digital outputs:
– 9 DIG-OUT relays 48 V AC
– 3 DIG-OUT relays 230 V AC - 5 A
• 1 slot connector for interface boards on SPI bus: Stulz accessory ACTHKEY (hardware key for on-site
microprocessor programming and application setup).
• 3 serial interfaces with microprocessor:
– COM0: 1 telephone connector for connection to the user interface board.
– COM1: 1 slot for IS232 / IS485 adapter boards for connection to monitoring systems or for programming.
– COM2: 1 telephone connector for master-slave connection.
• Clock and non volatile memory on board, on I2C bus
• Operating temperature: - 20°C ÷ 60°C
• Storage temperature: - 30°C ÷ 70°C

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2.2. SB7 board layout
Technical Data
Dimensions: 215 x 120 x 40 mm
Power consumption: 8 W
Fuse: 1A time-lag
Download interface: RS232 (external adapter required)
User interface board connection: RS485
There are three jumpers on board:
Name Description Default configuration
TL1 Central termination of the 485 user Not plugged in
TL2 Central termination of the 485 slave Plugged in
PRG Programming jumper Not plugged in
Connector for program
loading with IS232
Jumper TL1
Jumper for programming
operation PRG
CPU Connector for slave
board (RS485)
Connector for user interface board
(RS485) and 12V voltage supply
Jumper TL2

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2.3. I/O assignment
DIG-IN Phase cut for AC fans
AN-IN
4 ÷ 20 mA
AN-IN
PTC AN-OUT DIG-OUT AN-OUT for DC fans
Connectors layout
Top view of flat connectors
Top view of minifit connectors
POWER SUPPLY
Terminal Name Type Features Notes
X1 + Vdc Voltage 24 ÷ 48Vdc -15% / +25% Fast-on connector
X2 0 Vdc Supply Reference Fast-on connector
X3 PE Functional Earth Fast-on connector
19 17 15 13 11 9 7 5 3 1
20 18 16 14 12 10 8 6 4 2
9 7 5 3 1
10 8 6 4 2
1
3 2
4
56
1
2
3
4
1
2

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Analog input
ANALOG INPUT
Name Logic ID Signal type Range Terminals Features - description
T1 +
-
T1 PTC* -35÷90 X29 pin 1 Evaporator Temperature (TE)
X29 pin 2
T2 +
-
T2 PTC* -35÷90 X43 pin 1 Internal Temperature (TI)
X43 pin 2
T3 +
-
T3 PTC* -35÷90 X41 pin 1 Condenser Temperature (TC)
X41 pin 2
T4 +
-
T4 PTC* -35÷90 X44 pin 1 External Air Temperature (TAE)
X44 pin 2
ANIN-DI IC1 mA 4÷20 X5 pin 1 Internal Relative Humidity (IRH)
X5 pin 2
IC2 +
-
IC2 mA 4÷20 X42 pin 1 Condenser Pressure (PC)
X42 pin 2
ANIN-DI IC3 mA 4÷20 X5 pin 3 External Relative Humidity (ERH) /
Evaporator pressure (PE)
X5 pin 4
* PTC sensor KTY-81
Digital input
The 13 digital inputs are free-contact type. All of them have a common reference. The contacts for digital inputs must
be mechanical and non-solid state.
DIGITAL INPUT
Name Logic ID Signal type Terminals Features - description
ANIN-DI A1 Free contact X5 pin 5
X5 pin 6 Fire-smoke presence
DI1 A6 Free contact X13 pin 1
X13 pin 2 Magneto-thermal protection of condenser fan
ANIN-DI A3 Free contact X5 pin 7
X5 pin 8 Door open / Intrusion
ANIN-DI A4 Free contact X5 pin 9
X5 pin 10 External enable (ON-OFF)
DI2 A5 Free contact X15 pin 1
X15 pin 2 Magneto-thermal protection compressor
DI3 A8 Free contact X35 pin 1
X35 pin 2 Thermal protection heating element
DI4 A7 Free contact X12 pin 1
X12 pin 2 Magneto-thermal protection evaporator fan
DI5 A12 Free contact X40 pin 1
X40 pin 2 Air flow
DI6 A11 Free contact X39 pin 1
X39 pin 2 Dirty filter alarm (or blocked condenser)
DI7 A10 Free contact X38 pin 1
X38 pin 2 High pressure
DI8 A9 Free contact X37 pin 1
X37 pin 2 Voltage lack

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DI9 A13 Free contact X36 pin 1
X36 pin 2 Low pressure input
DI10 A2 Free contact X34 pin 1
X34 pin 2 Humidity switch
Analog output
ANALOG OUTPUT
Name Logic ID Signal type Range Terminals Features - description
ANOUT1 DAC0 Vdc 0÷10 V X6 pin 1 DC 1 supply : positive
X6 pin 2 DC 1 supply : negative
X6 pin 3 0÷10V signal output
X6 pin 4 Signal reference
ANOUT2 DAC1 Vdc 0÷10 V X7 pin 1 DC 2 supply : positive
X7 pin 2 DC 2 supply : negative
X7 pin 3 0÷10V signal output
X7 pin 4 Signal reference
DC FANS
Name Logic ID Signal type Range Terminals Features - description
V1 V1 PWM Duty cycle
0÷100 %
X17 pin 1 Fan 1 supply: positive
X17 pin 2 Fan 1 supply: negative
X17 pin 3 Fan 1 - PWM Signal (f = 1 kHz)
X17 pin 4 Fan 1 - Tachometric Signal input
V2 V2 PWM Duty cycle
0÷100 %
X18 pin 1 Fan 2 supply: positive
X18 pin 2 Fan 2 supply: negative
X18 pin 3 Fan 2 - PWM Signal (f = 1 kHz)
X18 pin 4 Fan 2 - Tachometric Signal input
V3 V3 PWM Duty cycle
0÷100 %
X19 pin 1 Fan 3 supply: positive
X19 pin 2 Fan 3 supply: negative
X19 pin 3 Fan 3 - PWM Signal (f = 1 kHz)
X19 pin 4 Fan 3 - Tachometric Signal input
AC FANS OUTPUT FOR SPEED ADJUSTMENT - PHASE CUT
Name Logic ID Pin (X8) Type Function description
AC FAN VC 1 Line Input: Phase Condenser fan
2 Phase cut Output
3
4 Line Input: Neutral 230 Power supply
5 Line Output: Neutral
6
An auxiliary connector (X25) is provided on board, in order to control the phase-cut module. The signal is a 5 mA
(approximately) current pulse on a 1K load; in order to produce the right phase delay between the pulse and the
network voltage zero-crossing instant, the line has to be connected necessarily to the poles 1 and 4 of X8.

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EXTERNAL PHASE CUT
Name Logic ID Pin (X25) Type Description
EXT. PHASE
CUT
EXT. PHASE
CUT
1 Pulse signal output current Signal for external phase cut module
2 Current signal feedback
Digital output
In the following table the default settings are showed; all the other associations are selectable via software.
DIGITAL OUTPUT
Name Logic ID Signal type Range Terminals Features - description
COMP K1 NO contact output K1 230Vac 5A resistive X9 pin 1 Compressor contactor
Common output K1 X9 pin 2
Not used X9 pin 3
Reference X9 pin 4
Reference X9 pin 5
Not used X9 pin 6
VE-VC K3 NO contact output K3 230Vac 5A resistive X10 pin 1 Evaporator fan
Common output K3 X10 pin 2
K4 NO contact output K4 230Vac 5A resistive X10 pin 3 Condenser fan / Humidification
Not used X10 pin 4
Not used X10 pin 5
Common output K4 X10 pin 6
DIGITAL
OUT
K5 NO contact output K5 48Vdc 1A resistive X11 pin 1 Common warning
K5 Common output K5 X11 pin 2
K6 NO contact output K6 48Vdc 1A resistive X11 pin 3 Low pressure alarm
K6 Common output K6 X11 pin 4
K7 NO contact output K7 48Vdc 1A resistive X11 pin 5 High pressure alarm
K7 Common output K7 X11 pin 6
K8 NO contact output K8 48Vdc 1A resistive X11 pin 7 Air flow
K8 Common output K8 X11 pin 8
K9 NO contact output K9 48Vdc 1A resistive X11 pin 9 Dirty filter
K9 Common output K9 X11 pin 10
K10 NO contact output K10 48Vdc 1A resistive X11 pin 11 High temperature alarm
K10 Common output K10 X11 pin 12
K11 NO contact output K11 48Vdc 1A resistive X11 pin 13 Low temperature alarm
K11 Common output K11 X11 pin 14
K12 NO contact output K12 48Vdc 1A resistive X11 pin 15 High humidity alarm
K12 Common output K12 X11 pin 16
K13 NO contact output K13 48Vdc 1A resistive X11 pin 17 Common alarm
K13 Common output K13 X11 pin 18
Not used X11 pin 19
Not used X11 pin 20

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2.4. Communication
COM1: PRG SPI COM2: COM0:
SLAVE USER
SPI synchronous serial interface
X24 allows the plug-in of a serial interface board, such as ACTHKEY (hardware key for software up/download).
COM1: PRG asynchronous serial interface
The connector X22 allows the plug-in of an IS232 (connector for program loading) or an IS485 (adapter to allow the
connection of C2020 to RS485 serial line) interface board for communication with a Tele-control gateway and other
serial devices.
COM0 – COM2: USER and SLAVE serial interfaces
There are two telephone connectors (RJ-12) on board: X20 for connection to the user interface (COM0) and X21 for
connection to a remote slave controller (COM2).
A pin-to-pin telephone cable must be used for connection to USER and SLAVE ports. Over 5 m length, screened cables
must be used.
Name Logic ID Signal type Terminals Features - description
USER
(COM0)
- - X20-1 Not connected
TX+ + RS485 X20-2 Line + RS485
TX- - RS485 X20-3 Line – RS485
GND Ground X20-4 Ground
+V V not adjusted X20-5 12V voltage supply
- X20-6 Not connected
SLAVE
(COM2)
- - X21-1 Not connected
TX+ + RS485 X21-2 Line + RS485
TX- - RS485 X21-3 Line – RS485
GND Ground X21-4 Ground
- - X21-5 Not connected
- - X21-6 Not connected

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2.5. User interface
An user interface board is supplied as an option; it’s connected to the mother board through a 4-poles telephone cable
(including serial bi-directional RS485 line and the power supply).
There are two serial user interfaces that can be linked to the mother board through USER connector:
• EO3 (corresponding to Stulz accessory ACTUKPD) will be used for the final customer.
• CO3 (corresponding to Stulz accessory ACTKPDC1010H) will be used for manufacturer and service.
2.5.1. EO3 user interface (Stulz accessory ACTUKPD)
• Dimensions: 76.5 x 58.5 mm
• 3 digits LED 7 segments display
• Keyboard, 4 keys:
– MENU / SET to enter into setup menu or to change setup parameters values
– UP to change values and to scroll up
– DOWN to change values and to scroll down
– ON_OFF / ESC to switch on / off the machine or to exit from setup menu
• 6 on-board LEDs:
– L1: Minus for negative number visualization on 7 segments display;
– L2, L3: Page displayed in normal mode
– H7: Machine status: cooling or freecooling on (green)
– H8: Common warning presence (yellow)
– H9: Alarm presence (red)
• Operating temperature: -0°C +70°C
The EO3 user interface layout is shown in the following drawing:
2.5.2. CO3 user interface (Stulz accessory ACTKPDC1010H)
• Dimensions: 200 x 70 mm, “no case”
• LCD display 20 x 4
• Keyboard, 6 keys:
– SET to change set point
– UP to change values and to scroll up
– DOWN to change values and to scroll down
– ESC to exit menu
– START/STOP to start/stop the controller
– MENU working menu access
• Operating temperature: -0°C +60°C (limited by LCD module)

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The CO3 user interface layout is shown in the following drawing:
2.5.3. WIB1000
WIB1000, or WIB1485, is a single point Ethernet interface, that is physically soldered on SPI connector.
WIB1000 is the option without the serial interface 485, while WIB1485 is the option with serial interface 485.
The parameters must be set as follows:
–M08 = 1
–M09 = PEMS
The board has the following features:
• Power supply +5V: from the main board
• It’s provided with 2 LEDs:
– 1 LED for correct power supply
– 1 LED for diagnostic
• It’s provided with three ports:
– USB 2.0 Full-speed Host-Port (12Mbits per second).
– 10/100Base-TX LAN Ethernet interface.
– Option: 1 serial 485 optocoupled connection on 3 poles, 3.81mm screw connector (only WIB1485).

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3. Interfaces
Two different user interfaces can be connected to the USER connector (EO3 and CO3) and it’s always possible to change
the user interface also when the board is powered. The user is auto detected by the software during the connection.
3.1. Visualization on E03 User
Note that a rotation is used to display strings with size greater than 3 digit.
Initialization mode
During initialization, the firmware version and the custom (if it’s different from zero) are displayed two times (STUTL2XX_
YY_ZZ).
Normal mode
If the system is off, “OFF” will be displayed.
If the system is in standby state, “STB” will be displayed (LED H8 and LED H9 off).
If the system is on, the value of internal temperature will be displayed.
When cooling or freecooling are switched on, LED H7 (green) will be switched on.
Pressing UP / DOWN key the following information will be displayed (Page 5, 6, 7, 8, 9, 10, 11, 12 and 13 with string
rotation):
Page 1 - Internal temperature:
“XX.X” (LED L2: OFF - LED L3: OFF)
Page 2 - External temperature:
“XX.X” (LED L2: ON - LED L3: OFF)
Page 3 - Internal relative humidity:
“XX.X” (LED L2: OFF - LED L3: ON)
Page 4 - External relative humidity:
“XX.X” (LED L2: ON - LED L3: ON)
Page 5 - Condenser fan speed:
“CF_XXX” (XXX = %)
Page 6 - Condenser pressure (M95=1) or condenser temperature (M95=0):
“PC_XXX” (XXX = bar or DIS)
“TC_XXX” (XXX = °C or DIS)
Page 7 - Compressor status:
“CP_XXX” (XXX = %, ON or OFF)
Page 8 - Evaporator fans speed:
“EF_XXX” (XXX = % or OFF)
Page 9 - Heater status:
“HT_XXX” (XXX = ON or OFF)
Page 10 - Freecooling damper status:
“FC_XXX_A” (XXX = %, OFF or DIS; A if freecooling damper is in assisted mode)
Page 11 - Evaporator temperature:
“TE_XXX” (XXX = °C or DIS)
Page 12 - Supply temperature:
“TS_XXX” (XXX = °C or DIS)
Page 13 - Firmware version and custom (if different from zero):
“STUTL2XX_YY_ZZ” (XX_YY = Firmware version; ZZ = Custom)
After 30 seconds without pressing any key, it returns to Page 1.

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Locked mode
If the user interface is locked, when the customer presses a key, the string “LOC” will be displayed for 5 seconds. See
the chapter 4.17 Locked keypad for more information.
Alarm mode
If an alarm occurs, the alarm code will be displayed alternating with the normal mode visualization and LED H9 (red)
will be switched on. If a “common warning” occurs, LED H8 (yellow) will be switched on.
If a key is pressed, the alarm is not displayed for 30 seconds. For a detailed list of alarm codes see the chapter 6 Alarms.
3.2. Menu on E03 user
3.2.1. Inserting and setting the passwords
If the user password is set, it will be request. The password is a value composed by 3 digits, everyone in the range 0-9;
the value must be inserted or set one digit at time. Entering in the USER SETUP menu, the mask “000” will be displayed
with the first digit on the left blinking and the customer, with the UP/DOWN keys, selects a number comprehensive
between 0 and 9. To confirm the choice press the SET key and the second digit will start blinking. Continue in this way
until the insertion of the 3 digits and, if the inserted password is right, the USER SETUP will be accessible.
It’s possible to go out from this procedure pressing the ESC key, going back the previous screen.
User password is factory set at 000, maintenance password is factory set at 111.
3.2.2. Entering the menu
To enter into setup menu, the MENU key has to be pressed from any screen.
Below there’s a flow chart that shows which menus are accessible using E03 user and how you can move between
them.
A - USER SETUP
B - COUNTERS
MENU
C - ALARM
HISTORY MENU
MENU
Press the SET key to enter into every single setup menu to change parameters and to store a parameter changed. If you
press the ESC key, you will come back to the previous menu without storing anything.
To change a parameter, press the MENU key and ‘A’ will appear on the screen.
For example, if the parameter “Cooling band” (S06) has to be changed, select the desired menu, then press the SET key
and ‘S01’ will appear. By pressing the UP / DOWN key it’s possible to scroll the various parameter: in this case “Cooling
Band” is the sixth parameter, so it’s sufficient to press six times the UP key to obtain S06.
To change the value, press the SET key and the value will be shown (blinking), than press the UP / DOWN key to set a
different value. To store the new value, press the SET key. If the ESC key is pressed, the new value isn’t stored.

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If A - User setup is selected:
• The display will show the code of the parameter
• Use UP / DOWN keys to scroll all the parameters
If B - Counters menu is selected:
• Use UP / DOWN keys to visualize one at a time the hours of activity of four devices (with string rotation) as below:
– Page 1 - Hours of evaporator fans activity (x100 h): “EF_XXX”
– Page 2 - Hours of condenser fan activity (x100 h): “CF_XXX”
– Page 3 - Hours of compressor activity (x100 h): “CP_XXX”
– Page 4 - Hours of freecooling damper activity (x100 h): “FC_XXX”
• Press ESC to go back to the previous menu
If C - Alarm history menu is selected:
• Use the UP / DOWN keys to visualize one at a time the last 50 happened alarms (with string rotation).
3.3. Visualization on C03 user (ACTKPDC1010H)
In the first screen the following data are displayed:
1. The manufacturer’s name ( “STULZ”)
2. The type of controller (“CONTROLLER C2020”)
3. The version of the software (standard or “client’s name”)
4. The client’s version (standard or name of the client)
** STULZ **
CONTROLLER C2020
STUTL2XX.YY
CCC
After the initialization phase a new screen appears. Use UP/DOWN ARROW keys to scroll the screens and display the
measured and set parameters, for example: external and internal temperature, external and internal humidity, fans on/
off, etc.
In the following figure all main screens are represented on the left and on the right side are explained the parameters
indicated in every screen.
If a component is not connected, the corresponding value doesn’t appear (---).

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c2) With temperature sensor:
- Velocity of condenser fan
- TC: Condenser temperature
- Set temperature of condenser
dd/mm/yyyy hh:mm
Room temp.: XX.X °C
Ext temp.: XX.X °C
State of the system
dd/mm/yyyy hh:mm
FAN COND. XX.X %
PC=XX SET=XX bar
State of the system
dd/mm/yyyy hh:mm
RH:Room XX.XExtXX.X
SETRH: XX.X HumStat
State of the system
dd/mm/yyyy hh:mm
FAN COND. XX.X %
TC=XX.X SET=XX °C
State of the system
dd/mm/yyyy hh:mm
CP XXX VE OFF
HEATER OFF
State of the system
dd/mm/yyyy hh:mm
FREE COOLING XX.X%A
TE=XX.X TM=XXX°C
State of the system
a)
b)
d)
e)
c.1) c.2)
dd/mm/yyyy hh:mm
Pe:XX.Xbar
Sp:XX.XHz Ti:XX.X°C
State of the system
dd/mm/yyyy hh:mm
Pw:XXXXXW V1:XX.XV
State of the system
dd/mm/yyyy hh:mm
ShRef:XX.XK Sh:XX.XK
Valve: XXX%
State of the system
dd/mm/yyyy hh:mm
Vdc:XX.XV If1:XX.XA
If2:XX.XA If3:XX.XA
State of the system
** STULZ **
CONTROLLER C2020
STUTL2XX.YY
CCC
dd/mm/yyyy hh:mm
Pf1:XX.XW Pf2:XX.XW
Pf3:XX.XW
State of the system
f)
g)
h)
i)
j)
k)
a) - Room temp: Internal temperature (TI)
- Ext temp: External temperature (TAE)
- State of the system: (SYSTEM OFF / SYSTEM ON / STAND-BY /EMERGENCY)
b) - Room temp: Internal temperature (TI)
- RH: Relative humidity of the room (IRH)
- Ext: External relative humidity (ERH)
- SETRH: Set point of humidification
- HumStat: State of humidification (OFF / HUMID xx% / DEHUM xx%)
c1) With pressure sensor:
- Speed of fan
- PC: Condenser pressure
- Set pressure of condenser
d) - CP: State of compressor (OFF / ON / XXX%)
- VE: State of evaporator fan
- State of heater
e) - Opening of freecooling damper (DISABLE / OFF / XX.X% / A-assisted mode)
- TE: Temperature at evaporator fan
- TM: Temperature of leaving air flow
f) (if enabled Danfoss compressor)
- Evaporator pressure - Data point Modbus 40206
- Compressor speed - Data point Modbus 40301
- Inverter temperature - Data point Modbus 40207
g) (if enabled Danfoss compressor)
- Pw: compressor power - Data point Modbus 40203
- V1: Line voltage - Data point Modbus 40222
h) (if enabled Danfoss compressor)
- Superheat reference - Data point Modbus 40007
- Superheat - Data point Modbus 40008
- Pct opening - Data point Modbus 40009
i) (if enabled Danfoss compressor)
- Vdc: Power supply voltage (V)
- IfX: Current absorbed by fan X (A). If the current absorbed is lower than 400mA,
it’s shown 0 A
j) (if enabled Danfoss compressor)
- PfX: Power consumption of fan X (W). If the current absorbed is lower than
400mA, it’s shown 0 W
k) (if enabled Danfoss compressor)
- Information screen, equal to thescreendisplayedat start up

EN/07.2013/58/20
Possible states of the system:
• SYSTEM OFF: the system has been switched off by the ON-OFF key. Components of the unit are not working,
alarms are disabled, the unit is still supplied and the controller is working.
• SYSTEM ON: the system has been switched on by the ON-OFF key; unit is working according to the set logic.
• STAND-BY: the system is on, but the unit doesn’t have to work for a certain time (e.g. due to sequencing function).
• EMERGENCY: see paragraph 5.5.
Locked keypad
If the keypad is locked, the key symbol “O-°” will appear in the corner on the right of the fourth line.
3.4. Menu on C03 user
All parameters are memorized in a menu structure with different level of password to access.
3.4.1. Inserting and setting the passwords
The password is a value composed by 3 digits, everyone in the range 0-9.
The value of the password must be inserted or set one digit at time. Entering in the USER SETUP, the display to insert
the password will appear with the first digit on left blinking, with the UP/DOWN keys select a number comprehensive
between 0 and 9. To confirm the choice press the SET key and the second digit will start blinking. Continue in this
way until the insertion of the 3 digits of the password and, if the inserted password is right, the USER SETUP will be
accessible. It’s possible to go out from this procedure pressing the ESC key, going back the previous screen.
User password is factory set at 000, maintenance password is factory set at 111.
3.4.2. Entering the menu
To enter into setup menu, the MENU key has to be pressed from any screen.
In the following figure there’s a flow chart which shows how you can move between the menu.