AKO-16526A V2 Advanced Temperature and Electronic Expansion Controller User Guide

AKO-16526A V2
AKO-16526AN V2
Advanced temperature and electronic expansion
controller for cold room store
User manual
1652H6A32 Ed. 03

16526A V2 Advanced Temperature and Electronic Expansion Controller

AKO Electromecánica thanks you and congratulates you on the purchase of our product, the development and manufacture of which involved the most innovative technologies, as well as rigorous production and quality control processes.
Our commitment to achieving customer satisfaction and our continuous efforts to improve day by day are confirmed by the various quality certificates obtained.
This is a high performance, technologically advanced product. Its operation and the final performance achieved will depend, to a great extent, on correct planning, installation, configuration and commissioning. Please read this manual carefully before proceeding to install it and respect the instructions in the manual at all times.
Only qualified personnel may install the product or provide technical support.
This product has been developed for use in the applications described in the manual. AKO Electromecánica does not guarantee its operation in any use not foreseen in this document and accepts no liability in the case of damage of any type which may result from incorrect use, configuration, installation or commissioning.
Complying with and enforcing the regulations applying to installations where our products are destined to be used is the responsibility of the installer and the customer. AKO Electromecánica accepts no liability for damage which may occur due to failure to comply with these regulations.
Rigorously follow the instructions described in this manual.
In order to extend the lifetime of our products to the maximum, the following points must be observed:
Do not expose electronic equipment to dust, dirt, water, rain, moisture, high temperatures, chemical agents or corrosive substances of any type.
Do not subject equipment to knocks or vibrations or attempt to handle them in any way differently to that indicated in the manual.
Do not under any circumstances exceed the specifications and limitations indicated in the manual.
Respect the indicated environmental conditions for operation and storage at all times.
During installation and on completion of this, avoid the presence of loose, broken or unprotected cables or cables in poor condition.
These may constitute a risk for the equipment and its users.
AKO Electromecánica reserves the right to make any modification to the documentation and the product without prior notification.

Warnings

• If the device is used without adhering to the manufacturer’s instructions, the device safety requirements could be compromised. Only probes supplied by AKO must be used for the unit to operate correctly.

• From -40 °C to +20 °C, if the NTC sensor is extended to 1000 m with at least a 0.5 mm cable, the maximum
  deviation will be 0.25 °C (cable for sensor extension ref. AKO-15586 / AKO- 15586H. Earth the cable mesh at one end only).

• Pt1000 sensors can be extended up to 25m using the AKO-15586/AKO-15586H sensor extension cable -The product should be installed in a place protected from vibrations, water and corrosive gases, where the ambient temperature does not exceed the value indicated in the technical data.

• For the reading to be correct, the sensor should be used in a place without heat influences apart from the temperature you want to measure or control.

• The IP65 protection degree is only valid with the protection cover closed.

• The IP65 protection degree is only valid if the cables enter the device using a tube for electric conductions + gland with IP65 or above. The gland should be the right size for the diameter of the tube used.

• Do not spray the unit directly with high-pressure hoses, as this could damage it.

• This device must be installed in a location where a minimum distance of 20 cm to the human body can be guaranteed, in order to ensure compliance with standards on human exposure to electromagnetic fields.

• The AKO-16526AN device must NEVER be operating without the internal antenna. This device can be fitted with any antenna provided it has a gain of less than 9.2 dBi and there is a minimum distance of more than 20 cm between it and any person or animal.
  Any type of antenna used with this device must comply with the limits established for the radio interface in Member States and the following documents: Commission Decision 2010/267/EU of 6 May 2010, ECC Decision (09)03 of 30 October 2009 and CEPT Report 30 of 30 October 2009.2

Maintenance

Clean the surface of the unit with a soft cloth, water and soap.
Do not use abrasive detergents, petrol, alcohol or solvents, as this might damage the unit.
Wiring
Always disconnect the power supply to do the wiring.
The probes and their cables must NEVER be installed in a conduit together with power, control or power supply cables.
For disconnection, the power supply circuit must be equipped with at least a 2 A, 230 V switch, located near the device. The power supply cable shall be of the H05VV-F or NYM 1×16/3 type. The section to be used will depend on current local regulations, but should never be less than 1.5 mm. Cables for relay or contactor outputs should have a section of 2.5 mm2 , allow working temperatures equal to or over 70ºC, and be installed with as little bending as possible.
The 120 / 230 V~ wiring area must be kept clear of any other external element.
The wiring setup depends on the options selected in the set-up wizard (See page 10) and on the input and output configurations (See page 37).
Check the enclosed schematic and the defined configuration before wiring.
The parameter St (Type of connected probes) affects all probe inputs. Therefore all connected probes (NTC or Pt1000) must be the same.
IMPORTANT:

• AUXILIARY relays are programmable, and their operation depends on the configuration.
• The function of the digital inputs depends on the configuration.
• The recommended currents and powers are the maximum working currents and powers.

Presentation

The AKO-16526A / 16526AN advanced controller for cold room stores has a SELFDRIVE operating mode that automatically controls (without parametrization) the fans and adaptively minimizes defrosts to optimise the performance of the cold room store: maximizing time in set point and minimizing costs linked to energy consumption and wear of components.
It has an output to regulate the electronic expansion valve. It can be configured so it can control superheating, as well as adjust the cold in the store.
The AKO-16526AN controller incorporates a Naboot communication module that allows it to send operation data to alkanet. cloud autonomously.
The different options are:
Temperature control + EEV controlled by PWM

**Temperature control + Stepper EEV***

• Requires the use of an external driver controlled by a 0-10 V or 4-20 mA signal. For more information on this option, please see the application note available on our website: 351652632

Description

1. Display
2. Keypad

Constant: Stand-By Mode activated. Regulation is paused.
Flashing: Controlled stop process for the regulation in progress.
Constant: Cold room door open.
Flashing: The door has been open for a longer time than defined in parameter A12.
There is an active alarm (No HACCP or temperature).
Constant: HACCP alarm active.
Flashing: HACCP alarm recorded and unconfirmed To acknowledge an HACCP alarm, press the key.
The temperature alarm is active.
Constant: Evaporator fans active.
Flashing: The evaporator fans should be active but something is preventing them from activating.
Constant: The COOL relay is active.
Flashing: The COOL relay should be active but a delay or protection is preventing this.
Pulsing: Expansion valve regulated.
Constant: The SELFDRIVE mode is active.
Flashing: An error has been detected in SELFDRIVE mode. To view it, press the▼ key.
Constant: Compressor active.
Flashing: The compressor should be active but a delay or protection is preventing this.
Defrosting active.
Continuous cycle mode active.
Cold room light active.
Alarm in progress muted.
Temperature displayed in ° Fahrenheit / ° centigrade.
**PRG**Programming mode active.
Lower display showing the real time superheating value.
**%** Lower display showing percentage of EEV opening.
**bar psi** Lower display showing low pressure in psi / bar.
ON: Device registered on the Naboot network and with a valid licence.
OFF: Unable to register on the Naboot network or the licence has expired.

Keypad

| Press and hold for 3 seconds to activate/deactivate the Stand-By mode. In this mode, regulation is paused and the  icon is displayed.
In the programming menu, it exits the parameter without saving changes and returns to the previous level, or exits programming.
---|---
| Pressing once without holding displays the temperature of sensor S2 for 10 seconds (if it is enabled).
Pressing it for 3 seconds starts/stops the defrost.
In the programming menu, it allows you to scroll through the different levels, or when setting a parameter to change its value.
| A brief press shows the SELFDRIVE mode errors.
Pressing it for 3 seconds activates/deactivates the continuous cycle mode.
In the programming menu, it allows you to scroll through the different levels, or when setting a parameter to change its value.
| Pressing once without holding activates/deactivates the cold room light.
Pressing it for 3 seconds accesses the condensed programming menu.
Pressing it for 6 seconds accesses the expanded programming menu.
In the programming menu, it accesses the level shown on the display or, during the setting of a parameter, accepts the new value.
| Pressing it once without holding it down displays the current effective value of the temperature Set Point in the upper display and the superheating set point in the lower display, taking into consideration temporary changes due to other parameters.
When an alarm is in progress, pressing once without holding mutes the acoustic alarm. Pressing for 3 seconds accesses the temperature Set Point setting.
| Only AKO-16526AN: Pressing the SET and ESC buttons for 3 seconds forces the transmission to the cloud via Naboot connectivity.

STAND-BY
If the regulation cannot be stopped immediately due to its configuration, a controlled stop process starts and the   icon flashes. To stop the controlled stop process and force Stand-by, press the Stand-by key again for 3 seconds.

Installation

• Remove the bezels (1)
• Make a 1/4 turn of the screws (2) anti-clockwise and open the door (3).
• Install the necessary glands (4 / 5) by drilling holes in the points indicated on the box.
• Mark and make the holes in the wall with the aid of the template included.
• Fix the device to the wall. If it is a brick wall, use the screws and plugs supplied; if the wall is made of sheet metal (cold room store), use the screws provided without plugs (6).
• Wire the device by following the recommendations indicated on page 3.
• Close the cover (3), tighten the screws (2) and replace the bezels (1).

ATTENTION: When drilling the holes for the glands, take care to avoid damaging the internal components.
AKO-16526AN: DO NOT DRILL ANY HOLES IN THE TOP OF THE DEVICE.
Installation of the probes
To achieve maximum performance from the advanced controller, correct installation of the probes is key as they are responsible for calculating the evaporator’s thermal transfer coefficient, evaluating the start and end of the defrosts and diagnosing problems in the evaporator.
Material included

• One 4 mm hermetic evaporator probe, 1.5 m of cable.
• Two NTC probes, 1.5 m of cable
•  Mounting clips for 10-13 / 14-18 / 19-21 / 22-25 mm coil

Location of the ambient probe
The probe should be located in a place that does not directly receive the flow of cold air from the evaporator. Preferably in its air aspiration area.
Location of the evaporator probe
The probe must be located as near as possible to the inlet of refrigerant from the evaporator (close to the expansion valve) in the finned area.
In certain evaporators, for example cubic ones, this inlet may be located on the front part of the battery, just behind the fan.
If defrost is done by electric heat, the probe must be located far away from them and, if possible, in the area of the evaporator where defrosting is slower, in other words, in the last area to defrost.
If the two conditions are not possible, the best possible compromise must be looked for.

Select the appropriate clip depending on the size of its evaporator pipe.

Attach the probe to the pipe using the clip, making sure that its end is in direct contact with the tube.

Bend the fins of both ends of the probe to increase the fixing and contact surface.

Initial configuration

The AKO-16526A / AKO-16526AN controller can be adapted to different types of installation according to the different options chosen in the set-up wizard.
Before completing the wiring, make sure you are familiar with the details of the installation in order to configure it correctly.
I t is advisable to note the following points:
Compressor
Whether the controller should switch the compressor on and off (InI= 2, 3, 5, 6, 7 or 8) or whether the compressor is switched on and off by the low pressure switch (InI=1 or 4). Defrost
Defrosting method used:
Electric (InI= 1, 2 or 3)
Air (evaporator fans) (InI= 4, 5 or 6)
Hot gas valve (Condensing unit) (InI= 7 or 8)
Analogue outputs
The analogue output (ANALOG OUT) enables communication between the controller and the external controller of the electronic expansion valve (if u00=2) and can be configured as 4-20 mA output (o30=0) or as 0-10 V output (o30=1).
Consult the specifications of the external controller or drive before setting this option.
SET POINT (temperature)
Make a note of the desired set temperature value.
Type of gas
Type of gas used in the installation.

Pressure sensor type
Type of evaporator pressure sensor installed:
4-20 mA (I61=1)
0-5 V (I61=2)
0.5-4.5 V (I61=3)
0-10 V (I61=4) 1-5 V(I61=5)
Note also the maximum and minimum values of the pressure sensor as well as the units of pressure used (bar or Psi).
Superheating SET POINT
Enter the desired optimum superheating value.
Assistant
The first time the unit receives the power supply, it will enter into ASSISTANT mode. The display will show the message flashing at .
**** The buttons▲ and▼  change the value, the SET button accepts the value and moves on to the next step.

Step 1:
Select the most suitable InI option based on the type of installation to be carried out and press SET.
The available options will be shown in the following table:

| Demo mode: it displays the temperature but does not regulate the temperature
| No| No| Electric| Yes| 0| 0| | 2| 0| 0| 0| 0| 20| 0| 0
| Yes| Yes| Electric| Yes| 1| 1| | 2| 7| 1| 0| 0| 20| 0| 0
| Yes| No| Electric| Yes| 0| 1| | 2| 0| 0| 0| 0| 20| 0| 0
| No| No| Air| Yes| 0| 0| | 1| 0| 0| 0| 0| 20| 1| 1
| Yes| Yes| Air| Yes| 1| 1| | 1| 7| 1| 0| 0| 20| 1| 1
| Yes| No| Air| Yes| 0| 1| | 1| 0| 0| 0| 0| 20| 1| 1
| Yes| Yes| Hot gas| Yes| 1| 1| | 2| 7| 1| 7| 1| 5| 2| 0
| Yes| No| Hot gas| Yes| 0| 1| | 2| 0| 0| 7| 1| 5| 2| 0

** If options 2, 5 or 7 are chosen, check the configuration of parameter I11 according to the pressure switch type used.
Step 2:**
Define the type of refrigerant gas used.

u02=24 R454A
Step 3:
Define the minimum value of the pressure sensor (I62) (Value at 4 mA, 0 V, 0.5 V or 1 V according to I61).
Step 4:
Define the maximum value of the pressure sensor (I63) (Value at 20 mA, 5 V, 4.5 V or 10 V according to I61).
*Steps only visible if u02=7
Step 5:
Select the temperature set point.
Step 6:
Set all other parameters to default?
dFP=0 No, the other parameters do not need to be changed.
dFP=1 Yes, set all other parameters to their default values.
This option only appears if this is not the first time the set-up wizard has been run.
The initial configuration is now complete, and the device will start to regulate the temperature.
** The configuration wizard will not reactivate. To reactivate it, activate the stand-by mode (by pressing the m key for 3 seconds) and wait until the unit completely halts regulation (the m indicator will light up permanently) and press the▲ ,▼, SET buttons in this order in sequence, not at the same time.
If the Pump Down function is active, there may be a delay between the initiation of the Stand-by function and the moment the controller stops (See page 17).
Registration on alkanet. cloud (only AKO-16525AN)**
In order for the controller to be able to send operation data to alkanet. cloud, it must be registered.
To do this, go to https://akonet.cloud (requires registration), click on “Add new device” and continue with one of these two methods:

• Enter the serial number (S/N) and validation code / IMEI that appear on the tag and press “Search”.
• Capture the QR code that appears on the tag using the option (requires having a camera on your PC, tablet or mobile phone).

These data are found on the tag on the right hand side of the controller. More information can be found in the alkanet. cloud user guide at: “https://enhelpakonet.ako.com/”
To access alkanet. cloud, enter this address in your browser (the use of Google Chrome is recommended): https://akonet.cloud.
Before activating the device, make sure that there is enough reception at the installation location. Activated devices may not be returned.
Forcing transmission
When the steps of the configuration wizard and the registration process are completed in alkanet. cloud, you must force a first transmission to verify the level of reception:
Press and hold the ESC and SET keys for 3 seconds.
After a moment, the display shows the quality of the Naboot signal received:

The controller does not start transmitting data to alkanet. cloud until the first transmission is forced.

Operation

Messages

| Pump down malfunction error (Stop). The time configured in parameter C20 has been exceeded. Only displayed on screen.
---|---
| Pump down malfunction error (Start). The time configured in parameter C19 has been exceeded. Only displayed on screen.
| Sensor 1, 2, 3, 4, 5 or 6 is faulty (open circuit, crossed circuit, or value outside sensor limits).
Activates the alarm relay and the audible alarm.
| Open door alarm. Only if the door stays open for a longer time than defined in parameter A12.
Activates the alarm relay and the audible alarm.
| Maximum temperature in control sensor alarm. The temperature value programmed in A1 has been reached. Activates the alarm relay and the audible alarm.
| Minimum temperature in control sensor alarm. The temperature value programmed in A2 has been reached. Activates the alarm relay and the audible alarm.
| External alarm activated (by digital input) . Activates the alarm relay and the audible alarm.
| Severe external alarm activated (by digital input). Activates the alarm relay and the audible alarm.
| Defrost time-out alert. The time set in d1 has been exceeded. Activates the alarm relay and the audible alarm.
| HACCP alarm. The temperature has reached the value of parameter h1 for a longer period than established in h2. Activates the alarm relay and the audible alarm.
| HACCP alarm due to a fault in the electric supply. The temperature set in h1 has been reached following a fault in the electric supply. Activates the alarm relay and the audible alarm.
| Minimum superheat alarm. The value set in A20 has been reached. Activates the alarm relay and the audible alarm.
| Minimum superheat alert. The value defined in A23 has been reached. Only displayed on screen.
| Maximum evaporating pressure alarm. The value defined in A26 has been reached. Activates the alarm relay and the audible alarm.
| Minimum evaporating pressure alarm. The value defined in A29 has been reached (See page 27).
Activates the alarm relay and the audible alarm.
| Indicates that a defrost is being performed (See page 21). Only displayed on screen.
| Password request. See parameters b10 and PAS (See page 37). Only displayed on screen.
| Shown sequentially with the temperature: The controller is in demo mode, the configuration has not been made.
| Calibration ongoing, therefore, avoid, as far as possible, opening the cold room during the process.
For more information, (See page 14).
| Flashing light with temperature: Configuration has been changed from 1 to 2 evaporators or vice versa.

SELFDRIVE mode alert messages (Only shown by pressing the▼  key)

| Defrost end error in 1/2 evaporator during the calibration, defrost has not ended due to temperature.
---|---
| Error during calibration in 1/2 evaporator. There is not enough difference in temperature between the cold room probe and the evaporator probe.
| It has not been possible to carry out the calibration due to a lack of stability in the system (Excessive door opening, excessive oscillations in the lower pressure, etc.).
| Error during normal operation (SELFDRIVE Mode active) in 1/2 evaporator. There is not enough difference in temperature between the cold room probe and the evaporator probe.
| A lack of stability has been detected in the system (Excessive door opening, excessive oscillations in the low pressure, etc.) during normal operation (SELFDRIVE Mode active).
| The persistent lack of stability has led to the deactivation of the SELFDRIVE mode.
| Excessive door openings have been detected during calibration and it has not been possible to calibrate.
| Excessive door openings have been detected and the device cannot regulate in SELFDRIVE mode.

SELFDRIVE mode

If the SELFDRIVE mode is activated (default configuration), the device periodically evaluates the evaporator’s heat transfer, managing the available resources to maximize it.
The defrosts are minimized, adapting to the changing conditions of the cold room, reducing heat input into the refrigerated space, thermal stress in the evaporator and energy consumption.
Operation of the evaporate fans is optimised taking into account the compressor status, evaporate temperature, frost level, opening of the door, etc.
The control function of the drainage resistor minimizes its activation (moments before starting a defrost), thereby reducing energy consumption.
To achieve correct operation of the SELFDRIVE mode, it is very important for the probes to be correctly installed, as described on page 8.
Calibration
During the first hours of operation, the device performs two calibrations automatically, during which the display shows the CAL message.
Calibration may take several hours and include several refrigeration and defrost cycles.

IMPORTANT:
During the calibration processes, the following should be avoided:

• Opening the cold room door
• Turning the controller off or putting it on stand-by
• Changing controller parameters, including the set point

While the calibration process is active:

• Manual defrost cannot be activated (  key)
• The continuous cycle cannot be activated
• The set point change function cannot be activated

If calibration cannot be performed, or if an important part of the installation is replaced (compressor, evaporator, etc.) it is advisable to perform a manual calibration.
It is also recommended (not essential) to perform a manual calibration, once the installation has completed its commissioning, with a load inside it and when its operating temperature has been stabilised, after several days of operation, in this way calibration is optimal.
In the event of changing the set point or hysteresis, the device performs a calibration again automatically, except if the set point change is made using the “set point change mode” function (See page 19).
To perform a manual calibration, access the parameter menu (See page 32) and follow this sequence:

• Access parameter b30
• A security code is requested, enter code 63
• Using keys▲ and ▼, select option 1 and press SET

Cold regulation

Solenoid control (COOL Relay)
If u00=0 is selected in the wizard, coolant production is regulated by opening/closing the solenoid valve, which sends liquid to the thermostatic expansion valve.
If u00=1 is selected in the wizard, coolant production is regulated by controlling the opening and closing of the expansion valve (PWM control).

If u00=2 is selected in the wizard, coolant
production is regulated by controlling the opening degree of the expansion valve (stepper control). For more information on this type of regulation, please consult the application note available on our website.
When the temperature in sensor S1 reaches the set point value (SP) plus the sensor differential (C1), coolant production is activated and the temperature drops. Once the set point (SP) value is reached, the solenoid closes.
Compressor control (Relay AUX 1)
With Pump Down (Inl: 2, 5, 7)
Requires the connection of a low pressure switch in digital input 1.
When the temperature in sensor S1 reaches the set point (SP) value plus the sensor’s differential (C1), the solenoid opens, causing the pressure in the evaporator to increase and, therefore, the low pressure switch deactivates and the compressor starts up.
Once the set point (SP) value is reached, the solenoid closes, causing the pressure in the evaporator to decrease, triggering the low pressure switch and stopping the compressor.
For further details of the process, see the next page.
Without Pump Down (Inl: 3, 6, 8)
The compressor operates simultaneously with the solenoid valve, starting up when the latter opens and stopping when it closes.
Operation in the event of a fault in sensor S1
If sensor S1 fails (fault, disconnection, etc. ), compressor behavior will depend on parameter C6, with one of 3 options available:
C6=0: The compressor is stopped until sensor S1 begins to operate again.
C6=1: The compressor is started-up until sensor S1 begins to operate again
C6=2: The compressor operates in line with the average operation during the 24 hours prior to the error, taking into account the number of start-ups and stops and the average time in each state (stop-start). If 24 hours have not elapsed without a sensor error, the device moves to C6=3 mode.
C6=3: The compressor operates according to the times programmed in C7 (ON) and C8 (OFF).

Control of superheating
Superheating (SH) is the temperature difference between the temperature at the evaporator outlet and the evaporating temperature. To obtain the SH value, sensors S5 (evaporator outlet temperature) and S6 (pressure sensor) are required. The pressure is converted to temperature according to the refrigerant gas used, so that the SH is obtained as:
SH (K) = Temperature S5 – Temperature S6
A low superheat allows for better evaporator efficiency, but too low a value may cause liquid to enter the compressors because the liquid in the evaporator is not completely evaporated.
The AKO-16526A / AKO-16526AN provides stable superheat regulation and a fast response to pressure or load fluctuations, thus ensuring a high level of system safety.
** When the EEV is regulating, the cold icon on the display performs a dimming sequence, indicating that the expansion regulation is electronic and is therefore constantly being adjusted.
The superheat value is shown on the bottom line of the display by default. Parameter b23 defines which value is displayed on that line.
When there is no cooling required, the superheat value is not updated, as the regulation is stopped.
When the controller does not generate coolant, the display shows the last superheat value reached before cooling was required, for the user’s information.
IMPORTANT**
Install sensors S5 and S6 at the evaporator outlet.
The parameters must be set correctly in the set-up wizard to ensure correct regulation of superheating.
Incorrect configuration can lead to problems in the refrigeration system.
Manual opening of the EEV valve
Using parameter U11, a fixed opening value can be set for the EEV valve. The equipment will perform ON/OFF cycles according to U03 but always in line with the selected opening percentage.
This function should only be used by qualified personnel and in exceptional circumstances.

• Access parameter U11; the equipment will request a security code.
• Enter code 63
• Enter the opening percentage and press SET

The equipment will not readjust the valve opening until U11=0 is configured again (manual opening disabled).
The valve will remain closed while there is no cold demand.
Pump down function
This function foresees problems in the compressor caused by movements of coolant, using a stop/start technique for the installation, controlled via the liquid solenoid, the low pressure switch and the compressor itself.
This function is only available for Inl 2, 5, and 7 and requires the connection of a low pressure switch in digital input 1. (I10=7)
STOP
When the temperature in sensor S1 reaches the set point (SP) value, the COOL relay deactivates, closing the solenoid valve.
Because the compressor continues to operate, pressure in the evaporator quickly drops. Upon reaching a given value, the low pressure switch activates, changing the status of digital input 1, which stops the compressor (relay AUX 1).
This maneuver isolates all of the coolant in the high-pressure line, far from the compressor crankcase, preventing serious faults upon start-up.
Should the low pressure switch fail, the controller stops the compressor once the safety interval defined in C20 has elapsed, displaying the message “ Pd ” (an informative message that does not affect the unit’s operation).
If C20 time is 0 (default value), the compressor will not stop until the low pressure switch is activated, but it will display the “ Pd ” message after 15 minutes.
START
When the temperature in sensor S1 reaches the set point value plus the differential (SP+C1), the COOL relay activates, opening the liquid solenoid. This increases the pressure in the evaporator, deactivating the low pressure switch, which turns the compressor on.
If, some time (determined by C19) after the liquid solenoid is opened (COOL relay set to ON), the low pressure switch does not deactivate, the controller will once again close the solenoid (COOL relay set to OFF) and the “ LP ” message will be displayed.
This maneuver will be repeated every 2 minutes, indefinitely, until the pressure switch is deactivated and the installation reverts to its normal operation. If C19 time is 0 (default value), the solenoid will remain open until the low pressure switch deactivates, but  t will display the “ LP ” message after 5 minutes.
STAND-BY
If the pump down function is active, there may be a delay between starting the stand-by function and the controller stopping; this is because certain installation control phases cannot be interrupted. To force the stop of the controller, press the Stand-by key again for 3 seconds.

Examples:

C25=0 (S1: 100% S3: 0%)
C25=60 (S1: 40% S3: 60%)
C25=75 (S1: 25% S3: 75%)
C25=95 (S1: 5% S3: 95%)

This mode is particularly useful in large volume cold room stores, where there may be significant variations of temperature.
In the event of an error in probe 3 (E3), the controller only uses the reading of probe 1. If both probes break down (E1 + E3), the controller acts according to parameter C6.

Continuous cycle mode
This is used to quickly cool the cold room stores before products are loaded and is activated by pressing the key for 3 seconds.
Upon activating this mode, the compressor begins to operate until the temperature in sensor S1 reaches the set point value, minus the variation indicated in parameter C10.
The value of C10 is always negative, unless it is 0.

The unit will immediately return to normal operation. Should it not be possible to reach this point, the device will return to normal operation once the time configured in C9 has elapsed, or by pressing the key again for 5 seconds.

Calibration of sensor 1
Parameter C0 allows for correction of the temperature detected by sensor 1; this is particularly useful when the sensor cannot be located in the ideal place.
Set Point locking
Parameters C2 and C3 allow for an upper and lower limit to be established for the set point (SP), to protect the product or installation from Set Point manipulation.
Product temperature
This function allows using a temperature probe to display the product temperature.
To activate it, input 2 must be configured as “Product temperature” (I20=11), and the display of all the probes activated sequentially (C21=0).

Set Point change mode
This allows for quick alternation between two working temperatures in the cold room store, modifying the Set Point in line with the value indicated in parameter C12. The aforementioned value may be negative or positive, which allows for the Set Point to be reduced or increased. If it is configured in 0, the mode is disabled.
It is activated in three possible ways:
By means of an external switch connected to one of the digital inputs. The digital input should be configured as “Set Point change (I10 or I20=4). Activation through this method cancels any other activation and can only be deactivated using the same method.
By means of the AKONet application.
This requires the device to be connected to a Modbus network (See page 39).
By means of the CAMM module and the AKO CAMM tool application.

EXAMPLE:

**** If the SELFDRIVE mode is active:
It is recommended for calibration to be performed with the lowest set point value.
It is recommended that the difference between set points is not greater than 5ºC in negative cold room stores and 2ºC in positive cold room stores.

Compressor protection timing
Parameter C4 allows for selection of the type of timing to be applied to protect the compressor. These delays prevent continuous compressor starts and stops.
These timings affect the COOL and AUX 1 relays (if o00=1)
OFF-ON (C4=0): Minimum time in OFF mode before each start-up.
OFF-ON / ON-OFF (C4=1): Minimum time in ON and OFF mode for each cycle.
The delay time is defined by means of parameter C5; if C5=0, timing is disabled.

Door management

Standard operating mode (CE=0)
Door management allows for the installation’s behaviour to be controlled, should the cold room door open through
parameters C22 and C23.
Parameter C22 defines whether cold production should be stopped if the door opens. If C22=1, when the door
opens, the fans stop and, 15 seconds later, the solenoid closes (COOL relay).
Parameter C23 defines the maximum time, in minutes, that the installation can remain without producing cold whilst
the door is open. If C23=0, cold is not produced with the door open.

Door management

Standard operating mode (CE=0)
Door management allows for the installation’s behaviour to be controlled, should the cold room door open through parameters C22 and C23.
Parameter C22 defines whether cold production should be stopped if the door opens. If C22=1, when the door opens, the fans stop and, 15 seconds later, the solenoid closes (COOL relay).
Parameter C23 defines the maximum time, in minutes, that the installation can remain without producing cold whilst the door is open. If C23=0, cold is not produced with the door open.

SELFDRIVE operating mode (CE=1)
If the SELFDRIVE mode is active, in the case of opening the door, the fans stop, or do not stop, depending on parameter C22. If the door does not close, when the time set in parameter C24 has passed, cold production stops and does not activate again until the time set in C23 has passed.
If, when the door is opened, cold is not being produced, only parameter C23 is taken into account.

Management of door frame resistor
If the set point is equal to or below -4°C and the relay AUX 1, 2 or 3 has been configured as “door frame resistor” (o00, o10, o20=5), the resistor is activated (relay ON) when the temperature of the cold room store drops below -3°C, and is deactivated (relay OFF) when 0°C is reached.

Types of defrost
There are 5 possible defrost types, depending on the option selected in the wizard (Inl):
Electric (InI=1, 2 and 3) (d7=0)
Defrost is performed through electrical resistors, supplying the evaporator with heat. The operation of fans in this mode depends on parameter F3; the compressor and solenoid are stopped.

By air (InI=4, 5 and 6) (d7=1)
Usually used in positive cold rooms (> 3°C), since the inside temperature of the cold room is sufficient to melt evaporator ice. By default, the fans are activated so that air may circulate through the evaporator; to stop them, change parameter F3 to 0.
The compressor and solenoid are stopped.

Hot gas (InI=7 and 8) (d7=2)
The hot gas from compressor discharge is used to melt evaporator ice and, to this end, two valves are necessary: one at the condenser input (A) and another between the compressor output and the evaporator input (B).
During the process, the liquid solenoid valve (C) and the condenser input valve (A) are closed and the evaporator input valve (B) is opened, forcing hot gas to pass through the latter, melting the ice.
Optionally, a high pressure switch (D) can be added to control the solenoid valve (digital input D2, l20=7) during the defrost process using hot gas. If the pressure decreases, the solenoid opens to allow liquid into the tank; when the pressure rises again, the solenoid closes.
Control of defrost in standard mode (CE=0)

Defrost start
Defrost will start if:

• The time programmed in parameter d0 has elapsed since the start of the last defrost.
• Press the  key for 3 seconds.
• By means of an external push-button (I10 / I11=5).
• Through the app or through AKONet.

Defrost completion
Defrost will complete if:

• The temperature programmed in parameter d4 has been reached in sensor 2. This requires a 2nd sensor (l00=2) to be available, located in the evaporator.
• The time configured in parameter d1 has elapsed (maximum defrost duration).
• Press the  key for 5 seconds.
• By means of an external push-button (I10 / I20=5).
• Through the app or through AKONet.

Control of defrost in SELFDRIVE mode (CE=1)
Defrosts in SELFDRIVE mode are not programmed, but rather the device evaluates the operation of the cold room and manages defrosts depending on the needs of the installation.
If a drop in the performance of the cold room is detected due to formation of ice in the evaporator, defrost is activated and it is supervised until its completion.
Using parameter d30, the defrost strategy is defined, a lower value allows less formation of frost in the evaporator, while a higher value acts with lower frequency allowing more frost to accumulate in the evaporator.
As a rule, a more aggressive strategy provides the system with greater efficiency allowing more frost to accumulate.
Adapting the value of this parameter to the type of evaporator used and to the type of defrost configured according to the following table is recommended:

Fin spacing of the evaporator in mm

| TYPE OF DEFROST
---|---
ELECTRIC| AIR| HOT GAS
| | | | | | | |
Fin spacing of the evaporator in mm| <3| 0| 1| 2| 1| 3| 4| 0| 1| 2
3.5| 0| 1| 2| 1| 3| 4| 0| 1| 2
4| 1| 2| 3| 2| 4| 5| 0| 1| 2
4.5| 2| 3| 4| 3| 5| 6| 1| 2| 3
5| 2| 3| 5| 3| 5| 7| 1| 2| 3
5.5| 2| 3| 5| 3| 5| 7| 1| 2| 4
6| 3| 4| 6| 4| 6| 8| 1| 3| 4
6.5| 3| 4| 6| 4| 6| 8| 1| 3| 4
7| 4| 5| 7| 4| 7| 9| 2| 3| 4
7.5| 4| 6| 7| 5| 8| 9| 2| 3| 4
8| 4| 6| 8| 5| 8| 10| 3| 4| 5
8.5| 5| 7| 8| 6| 9| 10| 3| 4| 5
9| 5| 7| 8| 6| 9| 10| 4| 5| 6
9.5| 5| 8| 9| 6| 10| 10| 4| 5| 6
10| 6| 8| 9| 7| 10| 10| 4| 5| 6
10.5| 6| 8| 10| 7| 10| 10| 4| 5| 6

11| 6| 9| 10| 7| 10| 10| 4| 5| 6

Strategy:
Conservative
Moderate
Aggressive

Parameter d31 allows establishing a time limit without making defrosts, if the cold room does not require defrosts set it to 0, if the cold room can generate frost it is recommended to set a security time of between 2 and 7 days.
Parameter d32 defines the maximum time permitted of the cold room without reaching the Set Point, after which an emergency defrost starts to unlock the evaporator.
Parameter d4 defines the final defrost temperature.
**** It is advisable to configure all the parameters relating to defrost since, in the event of a calibration or operating error of the SELFDRIVE mode, the controller then temporarily regulates in standard mode.

Other defrost parameters (They have an effect in standard and SELFDRIVE mode)
Drip time
It is set by parameter d9 and defines the time added at the end of defrost to allow the evacuation of the remaining defrost water from the evaporator, during which time there is no cooling regulation.
Fan start-up delay
This is established through parameter F4 and allows for the possible drops left in the evaporator to freeze before the fans activate, preventing them from being projected into the cold room. It also prevents heat being supplied to the cold room due to defrost in the evaporator.

**** If defrost is cancelled before 1 minute has elapsed, the drip time (d9) is not applied and the fans are activated without taking into account the start-up delay (F4).
If defrost is by air or is static, the drip time (d9) and fan start-up delay (F4) are deactivated.

Message displayed during defrost
This is established using parameter d2, and you can choose between displaying the real temperature captured by sensor 1 (d2=0), showing the temperature captured by sensor 1 at the start of the defrost (d2=1), or displaying the dEF (d2=2) message. Parameter d3 defines the time during which the aforementioned message will be displayed once the drip time (d9) and fan stop time (F4) are complete.

Remote defrost
This function allows defrost of the unit to be activated using an external key, connecting it to one of the digital inputs that must be configured as remote defrost (I10 or I20=5).

Defrost locking
This prevents defrost starting at unusual points by means of an external switch, which may be useful for ensuring that the installation’s load does not excessively increase, exceeding the permitted limits.
The external switch must be connected to one of the digital inputs, which should be configured as “Defrost locking” (I10 or I20=6).

Defrosting in a second evaporator
This function allows for defrost to be controlled in a second evaporator, provided that defrost is by electric heat, by air or is static. The same type of defrost should be used for the first and second evaporators.
This requires configuration of input D2/S4 as a 2nd evaporator sensor (l20=10). In the event of an error in the 2nd evaporator sensor, defrost completes once the time defined in d1 has elapsed.

Electric defrosting
This requires configuration of relay AUX 2 as 2nd evaporator defrost (o10=4). Defrost begins simultaneously in both evaporators. When the sensor of evaporator 1 reaches the temperature defined in d4, the DEF relay deactivates, completing defrost of evaporator 1. Defrost of evaporator 2 is completed when the evaporator 2 sensor reaches the temperature defined in d4. Drip time begins when both defrosts are complete.
Defrost by air
The fans of both evaporators are connected in parallel to the FAN relay. Defrost begins simultaneously in both evaporators and does not complete until both probes reach the temperature defined in d4. Drip time subsequently begins.
Static defrost
Defrost begins simultaneously in both evaporators and does not complete until both probes reach the temperature defined in d4. Drip time subsequently begins.

Other parameters
Using parameter d5, you can configure whether the unit performs a defrost (d5=1) or not (d5=0) when it receives power (first start-up or after a power supply failure). Should the option YES (d5=1) be selected, defrost will begin once the delay time defined in d6 has elapsed.
Using parameter d8, we define the time tally established in d0, choosing between total time elapsed (d8=0) or the sum of compressor operation time (d8=1).

REMARK: If parameter d1 is configured to 0, no defrosts are performed.

Management of the drainage resistor

Activates the drainage resistor before the start of defrost and deactivates it one hour after finishing, avoiding unnecessary energy consumption in the absence of defrosts.
For this function to be active, parameter o10 (Relay AUX 2) should be set to 8.

Evaporator fans
Control of fans in standard mode (CE=0)
Fans are controlled through sensor 2 (evaporator) and parameters F0 (stop temperature) and F1 (sensor differential).
If sensor S2 is not connected or an error in the sensor (E2) is detected, the fans continuously operate without taking into account parameters F0 and F1, but taking the remaining parameters (F2 to F4) into account.
Using parameter F2, the status of the fans during compressor stops is defined.
Using parameter F3, the status of the fans during defrost is defined.
Parameter F4 defines the fan start-up delay time after defrost (See page 21).
Parameter C22 defines whether fans stop when the door is opened.

Control of fans in SELFDRIVE mode (CE=1)
With the SELFDRIVE mode active, fan control is performed taking into account the evaporator temperature, compressor, frost level, the cold room temperature and if the door is open or not, optimising its operation.
In this way its operation is optimised to obtain the greatest energy efficiency of the cold room.
With this mode active, only parameters F0, F1 and F4 need to be configured.

**** It is advisable to configure all parameters relating to the fans since, in the event of a calibration or operating error of the SELFDRIVE mode, the controller then temporarily regulates in standard mode.

Alarms
The device warns the user through an on-screen message as to activation of a relay (if a relay has been set as an alarm) and a sound alarm when the criteria programmed in the parameters are met.

Maximum / minimum temperature alarm
It shows the message “AK ” or “AL” when the temperature in sensor 1 reaches the value configured in parameters A1 (maximum temperature) and A2 (minimum temperature).
This value may be:

• Absolute (A0=1): The temperature at which the alarm should activate must be indicated in A1/A2.
• Relative to the SP (A0=0): The increase or decrease in the number of degrees necessary for the alarm to activate, in relation to the set point, must be indicated in A1/A2. This option enables us to change the set point without having to reset the maximum and minimum alarms.

Parameter A10 establishes the differential of both parameters (Hysteresis).

Example
We configure the following parameters in a controller: SP=2, A1=10, A10=2
– If A0=0 (Relative to the SP), the maximum temperature alarm will activate when 12 degrees are reached in sensor 1, and will deactivate when 10 degrees are reached.
– If A0=1 (Absolute), the maximum temperature alarm will activate when 10 degrees are reached in sensor 1, and will deactivate when 8 degrees are reached.

External alarm / severe external alarm
The message (External alarm) or (Severe external alarm) is displayed when the digital input configured as external alarm or severe external alarm is activated.

The severe external alarm also deactivates all the loads and, therefore, temperature regulation stops. When this alarm disappears, the device returns to its normal operation.
At least one of the digital inputs must be configured as an external alarm (l10 or l20=2) or as a severe external alarm (l10 or l20=2).

Evaporator sensor error alarm due to moisture ingress
If, at the start of defrost, the temperature in sensor S2 is 20°C higher than the temperature in sensor S1, the defrost ignores sensor S2 and completes due to time-out.
The display shows the message , activates the alarm relay and audible alarm.

The alarm can be silenced, but alarm icon  will not disappear until:

• The controller is switched off and then on again.
• Defrost without error is started in sensor S2.

If the 2nd evaporator sensor (l20=10) has been enabled, it will behave in the same way, but displaying the message .

HACCP alarm
The alarm is activated should situations be detected which could endanger the integrity of the products stored in the cold room.
If the temperature of the cold room is higher than that defined in parameter h1 for a length of time exceeding that defined in parameter h2, the alarm activates, displaying the message on screen.
Upon pressing the mute key, the sound alarm switches off, but the alarm remains. Once the temperature drops below parameter h1, if the mute key has been pressed, the alarm disappears. If the mute key has not been pressed, the audible alarm deactivates but the HACCP indicator remains in flashing mode, indicating than a non-confirmed HACCP alarm has occurred.
Press the mute key to confirm an HACCP alarm.
Sensor error alarm
If one of the enabled probes is crossed, open circuit, or out of range, the message E1, E2, E3, E4, E5 or E6 is displayed depending on whether it is sensor S1, S2, S3, S4, S5 or S6.

Open door alarm
The door has been open for a longer time than defined in parameter A12, the open door alarm is activated.
In order to detect the open door, configuration is required of one of the digital inputs as “door contact” (l10 or l20=1).
Activates alarm relay and audible alarm.

Minimum superheat alarm
If the superheat value falls below the value defined in parameter A20, the alarm is activated and the display shows the message .
The alarm disappears when the value A20 + differential A22 is reached.
Parameter A21 allows a delay in the activation of this alarm to be defined.
Activates the alarm relay and the audible alarm.

Maximum evaporating pressure alarm
If the evaporating pressure exceeds the value defined in parameter A26, the alarm is activated and the display shows the message .
The alarm disappears when the value A26 + differential A28 is reached.
Parameter A27 allows a delay in the activation of this alarm to be defined.
Activates the alarm relay and the audible alarm.

Minimum evaporating pressure alarm
If the evaporating pressure falls below the value defined in parameter r, the alarm is activated and the display shows the message .
The alarm disappears when the value A29 – A31 is reached.
Parameter A30 allows a delay in the activation of this alarm to be defined.
Activates the alarm relay and the audible alarm.

Alarm delays
These delays prevent certain alarms from being shown, to allow the installation to recover its normal operation after certain events.

• Delays in start-up (A3): This delays the activation of the temperature alarms upon receiving power (at startup or after a power supply failure) or when exiting Stand-by mode. This allows for the installation to start up avoiding alarms.
• Delay after a defrost (A4): This delays the activation of the temperature alarms when a defrost completes.
• Maximum and minimum temperature alarm delay (A5): This delays the activation of the maximum (A1) and minimum (A2) temperature alarms, from when the temperature in sensor 1 reaches the programmed value.
• Delay to activation of external alarm (A6): This delays the activation of the external alarm, from when the digital input becomes active.
• Delay to deactivation of external alarm (A7): This delays the deactivation of the external alarm, from when the digital input becomes active.
• Delay to activation of open door alarm (A12): Delays activation of the open door alarm.
• Delay to activation of alarm (A21): Delays activation of the low superheat alarm from when the programmed value is reached.
• Delay to activation of alarm (A26): Delays activation of the maximum operating pressure alarm from when the programmed value is reached.
• Delay to activation of alarm (A30): Delays activation of the lowest operating pressure alarm from when the programmed value is reached.

Alerts
The device alerts the user through an on-screen message when an event occurs which requires his/her attention.
However, it does not activate the sound alarm or the alarm relay (if active).
Defrost time-out alert
The message is displayed when a defrost has completed due to time-out, if parameter A8=1.

Pump down malfunction error (stop)
The message is displayed if a malfunction is detected when the installation is stopped using the pump down manoeuvre. (See page 17).

Pump down malfunction error (start-up)
Displays the message if a malfunction is detected when the installation is started up using the pump down manoeuvre. (See page 17).

Maximum overheating alert
If the superheat value falls below the value defined in parameter A23, the and the display shows the message .
The alert disappears when the value A23 – A25 is reached.
Parameter A23 allows a delay in the activation of this alarm to be defined.

Light control
Relay AUX 1 or AUX 2 must be configured as “Light” (o00, o10 or o20=2).
Switching the lights on or off is controlled using:

• The push-button: One press switches the lights on or off.
• The cold room door: When the door is opened, the lights remain on for the time defined by parameter b01.

If the value is 0, when the door closes the lights go out. (One of the digital inputs must be configured as door contact (l10 or l20=1). The control even occurs with the equipment in Stand-by.

Password
Allows the configuration of the equipment to be protected by a 2-digit code.
If it is active a code is requested when you try to access the programming menu. This menu cannot be accessed if a wrong value is entered. The code is set via the PAS parameter. Parameter b10 defines the operation of this code.

Remote Stand-by mode
This allows activating Stand-by mode using a switch connected to one of the digital inputs.
Said digital input must be set to Stand-by remote activation (I10=8 or I20=8).

Operation of the auxiliary relays

Depending on the controller model, it may have 1 or 2 auxiliary relays. The function of these relays is configurable via the parameter menu.

AUX 1 relay

• Deactivated (o00=0): Does not carry out any function.
• Compressors / crankcase resistor (o00=1): Controls compressor operation. When the compressor is not in operation, it powers the crankcase resistor. This function can only be selected via the initial wizard In{ ).
• Light (o00=2): This regulates the operation of cold room light.
• Virtual control (o00=3): The relay can be remotely activated and deactivated by means of AKONet software.
• Alarm (o00=4): This activates the relay every time that an alarm occurs (See page 26).
• Door frame resistor (o00=5): This controls the operation of the cold room’s door frame resistor (See page 20).
• Drainage resistor (o00=6): Controls the activation/deactivation of the evaporator drainage resistor (See page 25).

AUX 2 relay

• Deactivated (o10=0): Does not carry out any function.
• Alarm (o10=1): This activates the relay every time that an alarm occurs (See page 26).
• Light (o10=2): This regulates the operation of cold room light.
• Virtual control (o10=3): The relay can be remotely activated and deactivated by means of AKONet software.
• Defrost 2nd Evaporator (o10=4): This controls the defrost resistors of a second evaporator (See page 24).
• Door frame resistor (o10=5): This controls the operation of the cold room’s door frame resistor (See page 20).
• Same as solenoid status (o10=6): Imitates solenoid status: active if the solenoid is in ON mode, inactive if the solenoid is in OFF mode.
• Same as unit status (o10=7): Indicates the unit’s status: active if the unit is in ON mode, inactive if the unit is in Stand-by mode.
• Drainage resistor (o10=8): Controls the activation/deactivation of the evaporator drainage resistor (See page 25).

AUX 3 relay

• Deactivated (o20=0): Does not carry out any function.
• Alarm (o20=1): This activates the relay every time an alarm occurs (See page 26).
• Light (o20=2): This regulates the operation of cold room light.
• ON/OFF external control (o20=3): Sends the ON/OFF signal to the EVV driver.
• Defrost 2nd Evaporator (o20=4): This controls the defrost resistors of a second evaporator (See page 24).
• Door frame resistor (o20=5): This controls the operation of the cold room’s door frame resistor (See page 20).
• Drainage resistor (o20=6): Controls the activation/deactivation of the evaporator drainage resistor (See page 25).

Configuration

Condensed programming menu
This allows for the most-used parameters to be quickly configured. Press the SET key for 3 seconds to access it.

Parameters

Level 2|
---|---
Description| Values| Min.| Def.| Max.
SP| Temperature setting (Set Point)| ºC/ºF| -50| 0.0| 99
CE| SELFDRIVE Mode 0=Deactivated 1= Activated| | 0| 0| 1
C1| Sensor 1 differential (Hysteresis)| ºC/ºF| 1.0| 2.0| 20.0
d0| Defrost frequency (time between 2 starts)| h.| 0| 6| 96
d1| Maximum defrost duration (0=defrost deactivated)| min.| 0| | 255
d4| Final defrost temperature (by sensor) (If I00 ¹ 1)| ºC/ºF| 0| 8.0| 50
SH| Superheating set point| ºK| 0.1| 8| 40
F3| Status of the fans during the defrost 0=Stopped; 1=Running| | 0| | 1
A1| Alarm for maximum in sensor 1 (it must be higher than the SP)| ºC/ºF| A2| 99.0| 99.0
A2| Alarm for minimum in sensor 1 (it must be lower than the SP)| ºC/ºF| -50| -50| A1
d30| Defrost strategy in SELFDRIVE mode| | 0| 5| 10

Extended programming menu

Use the extended programming menu to configure all of the unit’s parameters in order to adapt it to your installation requirements. Press the SET key for 6 seconds to access it.

IMPORTANT: If the password function has been configured as a keypad lock (b10=2), or as an access to parameters block (b10=1), you will be requested to enter the password programmed in PAS when attempting to access either of the two functions. If the entered password is not correct, the unit will go back to showing the temperature.

IMPORTANT: Certain parameters or menus may not be visible depending on the configuration of the other parameters and the options chosen during set- up.

Extended programming menu

Parameters

Regulation and control

Level 1
Level 2| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
rE| SP| Temperature setting (Set Point)| ºC/ºF| -50| 0.0| 99
CE| SELFDRIVE Mode 0=Deactivated 1= Activated| | 0| 1| 1
C0| Sensor 1 calibration (Offset)| ºC/ºF| -4.0| 0.0| 4.0
C1| Sensor 1 differential (Hysteresis)| ºC/ºF| 1.0| 2.0| 20.0
C2| Set point top locking (it cannot be set above this value)| ºC/ºF| C3| 99| 99
C3| Set point bottom locking (it cannot be set under this value)| ºC/ºF| -50| -50| C2
C4| Type of delay for the protection of the compressor: 0=Minimum OFF time of the compressor 1=Minimum OFF and ON time of the compressor in each cycle| | 0| 0| 1
C5| Protection delay time (Value of the option selected in parameter C4)| min.| 0| 0| 120
C6| COOL relay status with fault in sensor 1:
0=OFF; 1=ON; 2=Average according to last 24 h before the sensor error; 3=ON- OFF according prog. C7 and C8| |

0

|

2

|

3

C7| Time of relay ON if sensor 1 damaged (If C7=0 and C8¹0, the relay will always be OFF when disconnected)| min.| 0| 10| 120
C8| Time of relay OFF if sensor 1 damaged (If C8=0 and C7¹0, the relay will always be ON when connected)| min.| 0| 5| 120
C9| Maximum duration of the continuous cycle mode. (0=deactivated)| h.| 0| 0| 48
C10| Variation of the Set Point (SP) in continuous cycle mode. When it reaches this point (SP+C10), it reverts to the normal mode. (SP+C10 ³ C3).
The value of this parameter is always negative, unless it is 0. (0=OFF)|

ºC/ºF

|

0

|

-50

| C3- SP
C12| Variation of the set point (SP) when the change set point change function is active. (SP+C12£ C2) (0= deactivated)| ºC/ºF| C3- SP| 0| C2- SP
C19| Maximum time for start-up after gas collection (Values between 1 and 9 seconds are not accepted) (0= Deactivated)| sec.| 0| 0| 120
C20| Maximum time for pump down (0= deactivated)| min.| 0| 0| 15
C22| Stop fans and COOL when opening door 0=No 1=Yes| | 0| 0| 1
C23| Start-up delay for fans and COOL when door open| min.| 0| 0| 999
C24| Delay time of cold stop with door open.| sec.| 0| 0| C23
C25| Influence of probe S3 when regulating with two temperature probes (I20=10) (See page 18)| %| 0| 0| 95
C27| Sensor 4 calibration (Offset)| ºC/ºF| -4.0| 0.0| 4.0
EP| Output to level 1

Defrost

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---

dEF

| dO| Defrost frequency (time between 2 starts)| h.| 0| 6| 96
d1| Maximum defrost duration (0=defrost deactivated)| min.| 0| | 255
d2| Type of message during the defrost: 0=Sign of the real temperature; 1=Sign of the temperature at the start of the defrost; 2=Sample of the dEF message| | 0| 2| 2
d3| Maximum message duration (Time added at the end of the defrost process)| min.| 0| 5| 255
d4| Final defrost temperature (by sensor) (If 100 # 1)| °C/°F| 0| 8.0| 50
d5| Defrost on connecting the unit: 0=NO, First defrost according to d0;
1=YES, First defrost according to d6| | 0| 0| 1
d6| Delay of the defrost start on connecting the unit| min.| 0| 0| 255
d7| Type of defrost: O=Resistors; 1=Air / fans; 2=Hot gas| | 0| | 2
d8| Time calculation between defrost periods:
O=Total real time 1=Sum of COOL time connected| | 0| 0| 1
d9| Drip time when a defrost finishes (Stop COOL and fans)| min.| 0| 1| 255
d30| Defrost strategy in SELFDRIVE mode (See page 23)| | 0| 5| 10
d31| Maximum time without defrosting (0=Deactivated)| h.| 0| 96| 999
d32| Maximum time of cold room outside the temperature regulation range (0=Deactivated)| h.| 0| 2| 10
EP| Output to level 1| | | |

Evaporator fans

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
FAn| F0| Fans stop temperature| ºC/ºF.| -50| 45| 50
F1| Sensor 2 differential if fans are stopped| ºC/ºF| 0.1| 2.0| 20.0
F2| Stop fans when the compressor stops 0=No 1=Yes| | 0| 0| 1
F3| Status of the fans during the defrost 0=Stopped; 1=Running| | 0| *| 1
F4| Start-up delay after defrost (if F3=0) Only actuates if higher than d9| min.| 0| 2| 99
EP| Output to level 1

Expansion valve

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
EEV| u00| Valve type: 1=PWM-type EEV 2=Stepper-type EEV| | 1| 1| 2
SH| Superheating set point| K| 0.1| 8| 40
u02| Refrigerant gas type: 0= R-404A, 1= R-134A, 2= R-407A, 3= R-407F, 4= R-410A, 5= R-450A, 6= R-513A, 7= R-744, 8= R-449A, 9= R-290, 10= R-32, 11= R-448A, 12=R1234ze, 13=R23, 14=R717, 15=R407C, 16=R1234yf, 17=R22, 18=R454C, 19=R455A, 20=R507A, 21=R515B, 22=R452A, 23=R452B, 24=R454A| 0| *| 24
u03| PWM cycle time| s.| 2| 6| 10
u04| Proportional constant value (P)| | 1| 10| 100
u05| Integral constant value (I)| | 0| 10| 100
u06| Derivative constant value (D)| | 0| 0| 100
u07| Opening value of the electronic expansion valve when cooling is activated| %| u13| 50| u12
u08| Duration of valve opening on cooling demand| s.| 2| 5| 240
u09| Valve opening value with sensor error S5 or S6: 0=Fixed opening according to u10; 1=Average opening over the last 24 hours| | 0| 0| 1
u10| Valve opening value with sensor error S5 or S6 (if u09=0)| %| u13| 0| u12
u11| Manual valve opening value (0=Disabled), (cycles acc. to u03) (See page 16)| %| u13| 0| u12
u12| Maximum valve opening value| %| u13| 100| 100
u13| Minimum valve opening value| %| 0| 0| u12
u14| Valve opening value after defrost (0=Disabled), (duration according to u15)| %| 0/ u13| 0| u12
u15| Duration of valve opening after defrosting| s| 0| 0| 240
u16| Valve opening in case of LOP error (0=valve closed)| %| 0/ u13| 0| u12
EP| Output to level 1

Alarms

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
AL| A0| Configuration of the temperature alarms 0=Relative to SP 1=Absolute| | 0| 1| 1
A1| Alarm for maximum in sensor 1 (it must be higher than the SP)| ºC/ºF| A2| 99.0| 99.0
A2| Alarm for minimum in sensor 1 (it must be lower than the SP)| ºC/ºF| -50| -50| A1
A3| Delay of temperature alarms in the start-up| min.| 0| 0| 120
A4| Delay of temperature alarms from the end of a defrost| min.| 0| 0| 99
A5| Delay of temperature alarms from when the A1 or A2 value is reached| min.| 0| 30| 99
A6| Delay of external alarm/severe external alarm on receiving digital input signal (I10 or I20=2 or 3)| min.| 0| 0| 120
A7| External alarm deactivation delay / Severe external alarm on disappearance of signal at digital input (I10 or I20=2 or 3)| min.| 0| 0| 120
A8| Show warning if the defrost ends for maximum time 0=No 1=Yes| | 0| 0| 1
A9| Polarity relay alarm 0= Relay ON in alarm (OFF without alarm); 1= Relay OFF in alarm (ON without alarm)| | 0| 0| 1
A10| Differential of temperature alarms (A1 and A2)| ºC/ºF| 0.1| 1.0| 20.0
A12| Delay of open door alarm (if I10 or I20=1)| min.| 0| 10| 120
A20| Minimum superheating value for LSH alarm| K| 0| 2| SH
A21| LSH alarm activation delay| sec.| 0| 30| 240
A22| LSH alarm hysteresis| K| 0.1| 2| Sh- A20
A23| Maximum superheating value for HSH warning| K| sh| 40| 40
A24| Delayed activation of the HSH warning| s| 0| 30| 240
A25| HSH alarm deactivation hysteresis| K| 0.1| 2| A23-sh
A26| Maximum evaporating pressure (MOP)| bar| 0| 60| 60
A27| MOP alarm activation delay (Delay time for activating alarm after threshold has been exceeded)| sec.| 0| 30| 240
A28| MOP alarm deactivation hysteresis (When the pressure drops below the MOP-hysteresis level the alarm is deactivated)| bar| 0.1| 1| 60
A29| Minimum evaporating pressure (LOP)| bar| -1| 0| 8
A30| LOP alarm activation delay (Delay time for activating alarm after threshold has been exceeded)| sec.| 0| 30| 240
A31| LOP alarm deactivation hysteresis (When the pressure exceeds the LOP+ hysteresis level the alarm is deactivated)| bar| 0.1| 1| 8
EP| Output to level 1

Basic configuration

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
bcn| b00| Delay of all functions on receiving power supply| min.| 0| 0| 255
b01| Cold room light timing| min.| 0| 0| 999
b10| Password function 0=Inactive 1=Block access to parameters 2=Lock keypad| | 0| 0| 2
PAS| Password| | 0| 0| 99
b20| MODBUS address| | 1| 1| 247
b21| Communication speed:
0=9600 bps 1=19200 bps 2=38400 bps 3=57600 bps| bps| 0| 0| 3
b22| Audible alarm enabled 0= No 1=Yes| .| 0| 1| 1
b23| Lower display function: 1=sensor S2, 2=sensor S3, 3=sensor S4, 4=sensor S5, 5=Su-
perheating, 6=Pressure sensor, 7=% EEV, 9=Carousel, 10 = Off| 1| *| 10
b30| Activation of manual calibration 0=Deactivated 1= Activated Requires security
code, (See page 14)| 0| 0| 1
Unt| Working units 0=°C 1=°F| | 0| 0| 1
EP| Output to level 1

Inputs and outputs

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
InO| St| Type of probes connected: 0= NTC, 1= Pt1000| | 0| 0| 1
I00| Probes connected: 1=Sensor 1 (cold room), 2=Sensor 1 (cold room) + Sensor 2 (evaporator)| | 1| 2| 2
I10| D1 / S3 input configuration: 0=Deactivated, 1=Door contact, 2=External alarm, 3=Severe external alarm, 4=Change SP, 5=Remote defrost, 6=Defrost lockout, 7=Low pressure switch, 8=Remote activation in standby mode, 9=Product temperature| | 0| *| 9
I11| Digital input polarity D1: 0=Activates on closing, 1=Activates on opening contact| | 0| 0| 1
I20| D2 / S4 input configuration: 0=Deactivated, 1=Door contact, 2=External alarm, 3=Severe external alarm, 4=Change SP, 5=Remote defrost, 6=Defrost lockout, 7=High pressure switch for hot gas, 8=Remote activation of standby mode, 9=Product temperature, 10=Defrost 2nd evaporator, 11=2nd cold room temperature probe| |

0

| | 11
I21| Digital input polarity D2: 0=Activates on closing, 1=Activates on opening contact| | 0| 0| 1
I60| Pressure units: 0= bar, 1= Psi| | 0| | 1
I61| Pressure sensor type (S6): 0= Deactivated, 1= 4-20 mA, 2= 0-5 V, 3= 0.5-4.5 V, 4= 0-10 V, 5= 1-5 V| | 0| 0| 5
I62| Minimum pressure sensor value (4mA, 0V, 0.5V, 1)| | -1| 0| I63
I63| Maximum pressure sensor value (20mA, 5V, 4.5V, 10V)| | I62| 12| 60
I64| Pressure sensor calibration (S2)| | -10| 0| 10

Inputs and outputs

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
In0| o00| AUX1 relay configuration: 0= Deactivated, 1= Compressor/Crankcase resistan- ce, 2= Light, 3= Virtual control, 4= Alarm, 5= Door frame resistor, 6=Drainage resistor| | 0| *| 6
o10| AUX2 relay configuration: 0= Deactivated, 1= Alarm, 2= Light, 3= Virtual control, 4= Defrost 2nd evaporator, 5= Door frame resistor, 6= Equal solenoid status, 7= Equal device status, 8=Drainage resistor| | 0| 2| 8
o20| AUX3 relay configuration: 0= Deactivated, 1= Alarms, 2= Light, 3= External AO controller ON/OFF, 4=Defrost 2nd evaporator, 5= Door frame resistor, 6=Drainage resistor| 0| 0| 6
o30| Analogue output type (AO): 0= 4-20mA, 1= 0-10V| | 0| 0| 1
EP| Output to level 1

HACCP alarm

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
HCP| h1| HACCP alarm maximum temperature| ºC/ºF| -50| 99| 99
h2| Maximum permitted time for activation of the HACCP alarm (0=HACCP alarm
deactivated)| h.| 0| 0| 255
EP| Output to level 1

Information (read-only)

Level 2
Level 1| Description| Values| Min.| Def.| Max.
---|---|---|---|---|---
tid| InI| Option chosen in the configuration wizard| | | |
Pd| Pump down active? 0=No, 1=Yes| | | |
PU| Program version| | | |
Pr| Program revision| | | |
PSr| Program subrevision| | | |
bU| Bootloader version| | | |
br| Bootloader revision| | | |
bSr| Bootloader subrevision| | | |
PAr| Parameter map revision| | | |
EP| Output to level 1

Connectivity

The controllers are equipped with a port for connection of RS485 (MODBUS) data, which allows for remote management of these using a AKO-5010, AKO-5025, AKO-5041 or AKO-5051 gateway.
The MODBUS address is factory-set and is indicated on the rating plate located on the left side of the controller. This address must be different for each unit within the same network.
The address can be changed using parameter b20. Once modified, the old address indicated on the plate will not be valid.

Technical specifications

Power supply …………………………………………………………………………………………………….. 100 – 240 V ~ 50/60 Hz
Maximum input power in the operation ………………………………………………………………………………………….8.1 VA
Maximum nominal current ………………………………………………………………………………………………………………15 A
DEF relay – SPDT – 20 A NO (EN 60730-1: 15 (15) A 250 V~ )
NC …………………………………………………..(EN 60730-1: 15 (13) A 250 V~)

FAN relay – SPST – 16 A (EN 60730-1: 12 (9) A 250 V~)
Relay COOL – SPST – SSR 2 A Vmax: 275 V~, Imax: 2 A

AUX relay 1 – SPDT – 20 A
NO …………………………………………………..(EN 60730-1: 15 (15) A 250 V~)
NC …………………………………………………..(EN 60730-1: 15 (13) A 250 V~)
AUX relay 2 – SPDT – 16 A
NO …………………………………………………….(EN 60730-1: 12 (9) A 250 V~)
NC …………………………………………………….(EN 60730-1: 10 (8) A 250 V~)
AUX relay 3 – SPST – 16 A
NO …………………………………………………….(EN 60730-1: 12 (9) A 250 V~)
No. of relay operations ……………………………………………………………………………..EN 60730-1:100,000 operations
Sensor temperature range …………………………………………………………………………………………..-50.0 ºC to 99.9 ºC
Resolution, adjustment and differential ………………………………………………………………………………………….. 0.1 ºC
Thermometric accuracy ………………………………………………………………………………………………………………… ±1 ºC
Tolerance of the NTC probe at 25 ºC ……………………………………………………………………………………………. ±0.4 ºC
Input for NTC probe ………………………………………………………………………………………. AKO-14950 / AKO-14950-8
Working ambient temperature ………………………………………………………………………………………….-10 ºC to 50 ºC
Ambient storage temperature ……………………………………………………………………………………………-30 ºC to 60 ºC
Protection degree ……………………………………………………………………………………………………………………….. IP 65
Installation category ……………………………………………………………………………………………….. II as per EN 60730-1
Degree of pollution ………………………………………………………………………………………………… II as per EN 60730-1
Grade as per UNE-EN 60730-1: Built-in control device, with Type 1.B automatic action operation feature, for use in clean situations, logical support (software) class A and continuous operation. Degree of pollution 2.
Double isolation between power supply, secondary circuit and relay output.
Accessible parts pressure ball test temperature ………………………………………………………………………………… 75 °C
Parts positioning active elements …………………………………………………………………………………………………. 125 ºC
Radio interference suppression test current ……………………………………………………………………………………270 mA
Voltage and current delayed by the EMC tests: ………………………………………………………………………..207 V, 17 mA
Type of mounting ……………………………………………………………………………………………………………… Fixed interior
MODBUS address ………………………………………………………………………………………………….. Indicated on the label
Dimensions ………………………………………………………………………………. 290 mm (W) x 141 mm (H) x 84.4 mm (D)
Internal buzzer

AKO-16526AN
Maximum transmission power ………………………………………………………………………………….. 23.5 dBm conducted
Antenna …………………………………………………………………………………………………………………………………. Internal
Bands …………………………………………………….. NBIoT (Narrow band) LTE Cat NB1 | B2, B3, B4, B8, B12, B13, B20

Band……………….. Rx Frequency…………………… Tx Frequency
2 …………….. 1930 MHz ~ 1990 MHz ……………. 1850 MHz ~ 1910 MHz
3 …………….. 1805 MHz ~ 1880 MHz ……………. 1710 MHz ~ 1785 MHz
4 …………….. 2110 MHz ~ 2155 MHz ……………. 1710 MHz ~ 1755 MHz
8 ………………. 925 MHz ~ 960 MHz ……………….. 880 MHz ~ 915 MHz
12 ……………… 729 MHz ~ 746 MHz ……………….. 699 MHz ~ 716 MHz
13 ……………… 746 MHz ~ 756 MHz ……………….. 777 MHz ~ 787 MHz
20 ……………… 791 MHz ~ 821 MHz ……………….. 832 MHz ~ 862 MHz

Simplified declaration of conformity

AKO Electromecánica S.A.L. hereby declares that the radioelectric device types AKO-16526AN (Advanced temperature controller for cold rooms with NBIoT communication) conform to the provisions set forth by Directive 2014/53/EU.
The full text of the EU conformity declaration is available at the following internet addres: http://help.ako.com/manuales/declaracion-ue-de-conformidad

AKO ELECTROMECÁNICA, S.A.L.
Avda. Roquetes, 30-38
08812 • Sant Pere de Ribes.
Barcelona • Spain
www.ako.com
We reserve the right to supply materials slightly different to those described in our Data Sheets. Updated information in our website.

**** 1652H6A32 Ed. 03

References

• AKONET.Cloud
• akonet.cloud help

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