Danfoss AK-RC 204B Temperature Controller for Walk-in Coolers and Freezers Installation Guide

Danfoss AK-RC 204B Temperature Controller for Walk-in Coolers and

Freezers

Temperature controller for walk-in coolers and freezers, type AK-RC 204B and AK-RC 205C

Warnings

• Using the unit without observing the manufacturer’s instructions may alter the appliance’s safety requirements. Only probes supplied by Danfoss should be used for the unit to operate correctly.
• From -40 – +20 °C, if the NTC probe is extended to 1000 m with at least 0.5 mm2 cable, the maximum deviation will be 0.25 °C
• It 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 probe should be used in a place without heat influences apart from the temperature you want to measure or control.
• IP65 protection degree is only valid with the protection cover closed.
• IP65 protection degree is only valid if the cables enter the device using a tube for electric conductions + gland with IP65 or above. The size of the glands should be suitable for the diameter of the tube used.
• Do not spray the unit directly with high-pressure hoses, as this could cause damage.

IMPORTANT

• Before starting the installation, you must take the advice of local regulations in force.
• The 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.

Wiring

Always disconnect the power supply to do the wiring.
The probes and their cables should NEVER be installed in a conduit together with power, control or power supply cables.

• For disconnection, the power supply circuit must be equipped with a switch of at least 2 A, 230 V, located near the device. The power supply cable will be H05VV-F or NYM 1×16/3. The section to be used will depend on the local standard in force, but must never be less than 2.5 mm2.
• Cables for relay or contactor outputs should have a section of 2.5 mm2, allow working temperatures equal to or over 70 °C and be installed with as few bends as possible.
• The 120/230 V~ wiring must be kept clear of any other external element.
• The wiring to be done depends on the type of installation. Use the appropriate diagram based on the option selected in the wizard. Check the available options on the diagrams included in the controller’s packaging.
• Wizard refers to a built in tool to guide the user through the set up process.

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.

Keypad

• Pressing it for 3 seconds activates/deactivates Stand-by mode. In this mode, regulation is paused and the icon is displayed. In the programming menu, this exits the parameter without saving changes, returns to previous level or exits programming.

• Pressing once displays the temperature of probe S2 for 10 seconds (If it is enabled).
  Pressing it for 3 seconds starts/stops the defrost.
  In the programming menu, this allows scrolling around the different levels, or, during the setting of a parameter, changing its value.

• Pressing it for 3 seconds activates/deactivates continuous cycle mode.
  In the programming menu, this allows scrolling around the different levels, or, during the setting of a parameter, changing its value.

• Pressing once 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, this accesses the level shown on the display or, during the setting of a parameter, accepts the new value.

• Pressing once displays the current effective value of the Set Point, taking into consideration temporary modifications by other parameters (C10 or C12).
  When an alarm is underway, pressing once mutes the acoustic alarm. Pressing for 3 seconds accesses the Set Point setting.

Indicators

• Fixed: Stand-by mode activated. Regulation is paused.
  Flashing: Controlled shutdown process for the regulation underway.

• Fixed: Cold room door open.
  Flashing: The door has been open for a greater time than has been defined in parameter A12.

• There is an active alarm, but not an active HACCP alarm.

• Fixed: HACCP alarm active.
  Flashing: HACCP alarm registered and unconfirmed. Press the key to confirm an HACCP alarm.

• Fixed: Evaporator fans active.
  Flashing: The evaporator fans should be active but a delay is preventing this.

• Fixed: The cold solenoid is active.
  Flashing: The solenoid should be active but a delay or protection is preventing this.

• Fixed: Compressor active.
  Flashing: The compressor should be active but a delay or protection is preventing this.

• Defrost relay active.

• Continuous cycle mode active.

• Cold room light active.

• Alarm underway muted.

• Temperature displayed in ° Fahrenheit / ° Centigrade.

• Programming mode active.

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

Initial configuration

The first time the unit receives the power supply, it will enter into ASSISTANT mode. The display will show the message flashing with 0.

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:

InI

| Type of installation| Parameters| Diagram to be used
---|---|---|---
Cold regulation| Pump Down| Defrost| Evap. fans| Pd| o00| I00| I10| I11| I20| I21| d1| d7| F3
0| Demo Mode: it displays the temperature but does not regulate the temperature or activate relays
1| Solenoid| No| Electric| Yes| 0| | 2| 0| 0| 0| 0| 20| 0| 0| A
2| Solenoid + compressor| Yes| Electric| Yes| 1| 1| 2| 7| 1| 0| 0| 20| 0| 0| B
3| Solenoid + compressor| No| Electric| Yes| 0| 1| 2| 0| 0| 0| 0| 20| 0| 0| B
4| Solenoid| No| Air| Yes| 0| | 1| 0| 0| 0| 0| 20| 1| 1| A
5| Solenoid + compressor| Yes| Air| Yes| 1| 1| 1| 7| 1| 0| 0| 20| 1| 1| B
6| Solenoid + compressor| No| Air| Yes| 0| 1| 1| 0| 0| 0| 0| 20| 1| 1| B
7| Solenoid + compressor| Yes| Hot gas| Yes| 1| 1| 2| 7| 1| 9| 1| 5| 2| 0| C
8| Solenoid + compressor| No| Hot gas| Yes| 0| 1| 2| 0| 0| 9| 1| 5| 2| 0| C
9| Solenoid + compressor| Yes| Reversed cycle| Yes| 1| 1| 2| 7| 1| 0| 0| 5| 3| 0| D
10| Solenoid + compressor| No| Reversed cycle| Yes| 0| 1| 2| 0| 0| 0| 0| 5| 3| 0| D
11| Solenoid| No| Static| No| 0| *| 1| 0| 0| 0| 0| 20| 1| –| A
12| Solenoid + compressor| Yes| Static| No| 1| 1| 1| 7| 1| 0| 0| 20| 1| –| B
13| Solenoid + compressor| No| Static| No| 0| 1| 1| 0| 0| 0| 0| 20| 1| –| B

• o00=2 in AK-RC 204B, o00=0 in AK-RC 205C
  Note: If options 2, 5, 7, 9 or 12 are chosen, check the configuration of parameter I11 according to the pressure switch type used. (See diagram included with the device).

Step 2:
Use keys and to enter the desired Temperature Set Point value and press SET. The wizard has finished.
The unit will begin to regulate the temperature.
If this is not the first time you use the wizard, after completing the last step the display will show the
message dFp (default parameters). You may choose between two options:
0: Only changing the parameters which affect the wizard. The other parameters will remain the same.
1: All parameters return to their factory setting except those which have been modified by the wizard.

Important: The wizard will not reactivate. To enter the wizard mode, initiate Stand-by mode by pressing the key for 3 seconds and wait until the unit completely halts the temperature regulation (the indicator will light up permanently) and press the following keys in sequence one after the other, , , SET.
Warning: If the pump down function is active, a certain amount of time may elapse between starting the stand-by function and the controller stopping.

Configuration

Condensed programming menu
Enables the rapid configuration of the most frequently-used parameters (SP, C1, d0, d1, d4, F3, A1 and A2). Press the SET key for 3 seconds to access it.

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

• If the function of the password has been configured as a keypad block (b10=2), or as an access block to parameters (b10=1), you will be requested to enter the access code 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.
• Certain parameters or menus may not be visible depending on the configuration of the rest of the parameters.

Regulation and control

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

rE

| SP| Temperature setting (Set Point)| °C/°F| -50| 0.0| 99
C0| Probe 1 calibration (Offset)| °C/°F| -20.0| 0.0| 20.0
C1| Probe 1 differential (Hysteresis)| °C/°F| 0.1| 2.0| 20.0
C2| Set Point top locking (it cannot be set above this value)| °C/°F| C3| 99| 99
C3| Set Point bottom locking (it cannot be set below this value)| °C/°F| -50| -50| C2

C4

| Type of delay for the protection of the compressor:

0 =Minimum time of compressor in OFF

1 =Minimum time of compressor in OFF and in ON 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 probe 1:

0 =OFF; 1 =ON; 2 =Average according to last 24 h prior to probe error

3 =ON-OFF according to prog. C7 and C8

| | ****

0

| ****

2

| ****

3

C7| Relay time in ON in the event of probe 1 failure

(If C7=0 and C8≠0, the relay will always be disconnected in OFF)

| Min.| 0| 10| 120
C8| Relay time in OFF in the event of probe 1 failure

(If C8=0 and C7≠0, the relay will always be connected in ON)

| 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 ≥ C3).

The value of this parameter is always negative, unless it is 0. ( 0 =OFF)

| ****

°C/°F

| ****

0

| ****

-50

| ****

C3-SP

C12| Variation of the Set Point (SP) when the change Set Point function is active. (SP+C12 ≤ C2) ( 0 = deactivated)| °C/°F| C3-SP| 0.0| C2-SP
C19| Maximum start time from Pump Down

(Values between 1 and 9 seconds will not be accepted) ( 0 =deactivated)

| Sec.| 0| 0| 120
C20| Maximum time for pump down ( 0 = deactivated)| Min.| 0| 0| 15

C21

| Probe to be displayed: 0 =All probes (sequential)

1 =Probe 1 (Cold Room), 2 =Probe 2 (Evaporator), 3 =Probe 3 (According to I20)

| | ****

0

| ****

1

| ****

3

C22| Stop fans and compressor on opening door 0 =No, 1 =Yes| | 0| 0| 1
C23| Start-up delay for fans and compressor with door open| Min.| 0| 0| 999
C27| Probe 3 calibration (Offset)| °C/°F| -20.0| 0.0| 20.0
EP| Exit to level 1| | | |

Defrost

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

dEF

| d0| 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 =Displays the real temperature; 1 =Displays the temperature at the start of the defrost; 2 =Displays the dEF message

| | ****

0

| ****

2

| ****

2

d3| Maximum duration of the message

(Time added at the end of the defrost process)

| Min.| 0| 5| 255
d4| Final defrost temperature (by probe) (If I00 ≠ 1)| °C/°F| -50| 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
d71)| Type of defrost:

0 =Resistors; 1 =Air/fans, 2 =Hot gas; 3 =Reversal of cycle

| | 0| *| 3
d8| Count of time between defrost periods:

0 =Total real time, 1 =Sum of compressor connected time

| | 0| 0| 1
d9| Drip time when completing defrost (Shutdown of compressor and fans)| Min.| 0| 1| 255
EP| Exit to level 1| | | |

• According to wizard.

1. It can only be modified using the configuration wizard (InI).

Evaporator fans

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

FAn

| F0| Shutdown temperature of fans| °C/°F| -50| 45| 50
F1| Probe 2 differential if fans are shut down| °C/°F| 0.1| 2.0| 20.0
F2| Shut down fans when the compressor shuts down: 0 =No, 1 =Yes| | 0| 0| 1
F3| Status of the fans during the defrost: 0 =Shut down; 1 =Running| | 0| 0| 1
F4| Delay of start-up after defrost (If F3=0) It will only actuate if it is higher than d9| Min.| 0| 2| 99
EP| Exit to level 1| | | |

Alarms

Level 1| Level 2| 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 probe 1 (It should be higher than the SP)| °C/°F| A2| 99| 99
A2| Alarm for minimum in probe 1 (It should be lower than the SP)| °C/°F| -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| | 0| 30| 99
A6| Delay of the external alarm/Severe external alarm on receiving a signal in digital input ( I10 or I20 = 2 or 3)| Min.| 0| 0| 120
A7| Delay of external alarm deactivation/Severe external alarm deactivation when the signal in digital input disappears ( 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

| Relay alarm polarity

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 )| °C/°F| 0.1| 1.0| 20.0
A12| Delay of open door alarm (If I10 or I20 =1)| Min.| 0| 10| 120
EP| Exit to level 1| | | |

Basic configuration

Level 1| Level 2| 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| Function of password

0 =Inactive, 1 =Block access to parameters, 2 =Block keypad

| | 0| 0| 2
PAS| Access code (Password)| | 0| 0| 99
b20| MODBUS address| | 0| 0| 247
b21| Communication speed:

0 =9600 bps, 1 =19200 bps, 2 =38400 bps, 3 =57600 bps

| bps| 0| 2| 3
b22| Acoustic alarm enabled: 0 = No, 1 =Yes| | 0| 1| 1
Unt| Work units: 0 =°C, 1 =°F| | 0| 1| 1
EP| Exit to level 1| | | |

Inputs and outputs

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

In0

| I00| Connected probes

1 =Probe 1 (Cold room), 2 =Probe 1 (Cold room) + Probe 2 (Evaporator)

| | 1| 2| 2

I101)

| Configuration of digital input 1

0 = Deactivated, 1 =Door contact, 2 =External alarm,

3 =Severe external alarm, 4 =Change of SP, 5 =Remote defrost,

6 =Defrost block, 7 = Low pressure switch, 8 =Remote Stand-by

| | ****

0

| ****

| ****

8

I11| Polarity of the digital input 1

0 =Activates on closing contact; 1 =Activates on opening contact

| | 0| *| 1

I20

| Configuration of digital input 2

0 = Deactivated, 1 =Door contact, 2 =External alarm, 3 =Severe external alarm, 4 =Change of SP, 5 =Remote defrost, 6 =Defrost block, 7 =Register probe, 8 =Probe 2° evaporator2), 9 =High pressure switch for Hot Gas, 10 =Remote Stand-by

| | ****

0

| ****

0

| ****

10

I21| Polarity of the digital input 2

0 =Activates on closing contact; 1 =Activates on opening contact

| | 0| 0| 1

o001)

| Configuration of relay AUX1

0 =Deactivated, 1 =Compressor/Resistor sump, 2 =Light, 3 =Virtual control,

4 =Alarm3)

| | ****

0

| ****

| ****

4

o10

| Configuration of relay AUX22)

0 =Deactivated, 1 =Alarm, 2 =Light, 3 =Virtual control, 4 =Door frame resistance, 5 =Defrost 2° evaporator, 6 =Same as solenoid status, 7 =Same as unit status

| | ****

0

| ****

2

| ****

7

EP| Exit to level 1| | | |

According to

1. It can only be modified using the configuration wizard (InI).
2. 2. Not available in AK-RC 204B
3. Available in AK-RC 204B only

HACCP alarm

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

HCP

| h1| Maximum temperature of HACCP alarm| °C/°F| -50| 99| 99
h2| Maximum permitted time for activation of the HACCP alarm ( 0 =Disabled)| H.| 0| 0| 255
EP| Exit to level 1| | | |

Information (reading only)

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

tid

| InI| Option chosen in the configuration wizard| | | |
Pd1)| Pump down active? 0 =No, 1 =Yes| | | |
PU| Program version| | | |
Pr| Program revision| | | |
bU| Bootloader version| | | |
br| Bootloader revision| | | |
PAr| Parameter map revision| | | |
EP| Exit to level 1| | | |

It can only be modified using the configuration wizard (InI).

Messages

A: Activates the acoustic alarm

R: Activates the alarm relay

Technical specifications

Control device classification

| Built-in assembly, with Type 1.B automatic operation action feature, for use in clean situations, logical support (Software) class A and continuous operation. Degree of contamination 2 acc. to UNE-EN 60730-1.

Double isolation between power supply, secondary circuit and relay output.

Temperature during ball-pressure test| Accessible parts: 75 °C

Parts which position active elements: 125 °C

Current of radio jamming suppression tests| 270 mA
Voltage and current as per EMC tests| 207 V, 17 mA
Type of assembly| Fixed internal
MODBUS address| Shown on label
Dimensions| 290 mm (W) x 141 mm (H) x 84.4 mm (D)
Internal buzzer| Yes

Ordering

Controller

•     1 x 1.5 m, NTC 10K sensor

•     1 x 3 m, NTC 10K sensor

| 080Z5001
AK-RC 205C| AK-RC 205C Gen. 2,5 O/P, Single phase| 080Z5002

Accessories (for spares and replacement purposes):

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