Danfoss AK-RC 204B, 205C Walk-In Cooler Temperature Controls User Guide

: June 3, 2024
: Danfoss

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AK-RC 204B, 205C Walk-In Cooler Temperature Controls
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AK-RC 204B, 205C Walk-In Cooler Temperature Controls

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

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Contents

1. Versions and references……………………………………………………………………………………………………………………………. 3 2. Warnings……………………………………………………………………………………………………………………………………………………….. 3 3. Maintenance………………………………………………………………………………………………………………………………………………… 3 4. Description…………………………………………………………………………………………………………………………………………………… 3 5. Installation …………………………………………………………………………………………………………………………………………………… 4 6. Wiring…………………………………………………………………………………………………………………………………………………………….. 5 7. Initial configuration …………………………………………………………………………………………………………………………………… 5 8. Operation……………………………………………………………………………………………………………………………………………………… 6
8.1 Cold regulation…………………………………………………………………………………………………………………………………….. 7 8.2 Door management ……………………………………………………………………………………………………………………………… 9 8.3 Defrost ………………………………………………………………………………………………………………………………………………….10 8.4 Defrost control…………………………………………………………………………………………………………………………………….10 8.5 Fan control …………………………………………………………………………………………………………………………………………..11 8.6 Alarms…………………………………………………………………………………………………………………………………………………..12 8.7 Alerts …………………………………………………………………………………………………………………………………………………….13 8.8 Light control ………………………………………………………………………………………………………………………………………..13 8.9 Password………………………………………………………………………………………………………………………………………………13 8.10 Remote Stand-by mode …………………………………………………………………………………………………………………….13 8.11 Operation of the auxiliary relays………………………………………………………………………………………………………13 9. Configuration ……………………………………………………………………………………………………………………………………………..14 10. Technical specifications……………………………………………………………………………………………………………………………19 11. Ordering ………………………………………………………………………………………………………………………………………………………20

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

1. Versions and references

Model AK-RC 204B AK-RC 205C

Description 4 relays temperature controller 5 relays temperature controller

Power supply 230 V~ ± 10%, 50 Hz ± 5% 230 V~ ± 10%, 50 Hz ± 5%

Circuit Breaker Protection No
Yes (Breaker)

2. Warnings
· Using the unit without observing the manufacturer’s instructions may alter the appliance’s safety requirements. Only NTC 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 electrical conduit + gland with IP65 or above. The size of the glands should be suitable for the diameter of the conduit 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.

3.0 Maintenance
· Clean the surface of the unit with a soft cloth, water and soap. · Do not use abrasive detergents, gasoline, alcohol or solvents, as this might damage the unit.

4.0 Description

Display

Keypad
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.
© Danfoss | Climate Solutions | 2022.07

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 in progress muted. Temperature displayed in ° Fahrenheit / ° Centigrade. Programming mode active.
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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

4.1 Keypad
Pressing it for 3 seconds activates/deactivates Stand-By mode. In this mode, regulation is paused and the power 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.

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.

Danfoss 80Z8117

5. Installation

· Remove the bezels (1) by pulling out on one side first and then

the other side.

· Make a 1/4 turn of the screws (2) counter-clockwise and open

the door (3).

· Install the necessary glands (4) removing the provided caps.

1

· 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

anchors supplied; if the wall is made of sheet metal (cold room

store), use the screws provided without anchors (5).

· Remove the plastic cover (7) loosening the screw (6) and wire

the device by following the recommendations indicated on p. 7.

· Once the wiring is done, reinstall the plastic cover (7), close the

cover (3), tighten the screws (2) and reinstall the bezels (1)

2

3
7 6
5 4

Ø Max.25 mm

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

6. 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 230 V~ wiring must be kept clear of any other external element.

· The specific wiring to be performed depends on the option selected in the initial configuration wizard.
· Use the appropriate diagram based on the option selected. · Check the available options on the diagram sheet included
with your device.
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.

7. Initial configuration

The first time the unit is powered up, it will enter into the Wizard mode. The display will show the message

1

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:

Danfoss 80Z8118

CORE

InI Cold regulation

Type of installation

Pump Down

Defrost

Evaporator fans

Parameters Pd o00 I00 I10 I11 I20 I21 d1 d7

Diagram to be
F3 used

0 Demo Mode: it displays the temp. but does not regulate 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

1127191520

C

8 Solenoid + compressor No

Hot gas

Yes

0120091520

C

9 Solenoid + compressor Yes Reversed cycle

Yes

1127100530

D

10 Solenoid + compressor No Reversed cycle

Yes

0120000530

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. 2
The unit will begin to regulate the temperature.

IIf this is not the first time you run the wizard, after completing the last step the display will show the message dFp (default parameters). You may choose between two options: 0: Only change 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.

Danfoss 80Z8119

CORE

Important: The wizard will not start automatically once the unit has been powered up at least once. To start the Wizard at any time turn off the controller by pressing the power button for 3 seconds and wait until the power symbol is ON. The press the buttons listed here in sequence , and SET. If the pump down function is active, a certain amount of time may elapse between starting the stand-by function and the controller stopping (see page 8).

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Wizard parameters list

Pd

Pump down active?

0=No

o00 Configuration of relay AUX1

0=Deactivated 2=Light

I00 Connected probes

1=Probe 1 (Cold room)

I10 Configuration of digital input 1

0= Deactivated 3=Severe external alarm 6=Defrost block

I11 Polarity of the digital input 1

0=Activates on closing contact

I20 Configuration of digital input 2

0= Deactivated 3=Severe external alarm block pressure switch for Hot Gas

I21 Polarity of the digital input 2

0=Activates on closing contact

d1

Maximum defrost duration (0=defrost deactivated)

d7

Type of defrost

0=Resistors of cycle

F3

Status of the fans during the defrost 0=Shut down

1=Yes

1=Compressor/Crankcase heater

3=Virtual control

4=Alarm (only in AK-RC 204B)

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

1=Door contact 4=Change of SP 7= Low pressure switch

2=External alarm 5=Remote defrost 8=Remote Stand-by

1=Activates on opening contact

1=Door contact 4=Change of SP 7=Register probe 10=Remote Stand-by

2=External alarm 5=Remote defrost 6=Defrost 8=Probe 2° evaporator 9=High

1=Activates on opening contact

1=Air/fans 1=Running

2=Hot gas

3=Reversal

8. Operation
Display messages

Pump down malfunction error (stop), the time configured in parameter C20 has been exceeded (see page 8). Only displayed on screen.

Pump down malfunction error (start-up), the time configured in parameter C19 has been exceeded (see page 8). Only displayed on screen.
Probe 1/2/3 failure (open circuit, crossed circuit or temperature outside the limits of the probe) Only E2 and E3: Damp evaporator probe (see page 12). Activates the alarm relay and the audible alarm.
Open door alarm. Only if the door remains open for a longer time than defined in parameter A12 (see page 12). Activates the alarm relay and the audible alarm.
Maximum temperature in control probe alarm. The temperature value programmed in A1 has been reached (see page 12). Activates the alarm relay and the audible alarm.
Minimum temperature in control probe alarm. The temperature value programmed in A2 has been reached (see page 12). Activates the alarm relay and the audible alarm.
External alarm activated (by digital input) (see page 12). Activates the alarm relay and the audible alarm.

Severe external alarm activated (by digital input) (see page 12). Activates the alarm relay and the audible alarm.
Alarm for defrost completed due to time-out. The time set in d1 has been exceeded (see page 13). Activates the alarm relay and the audible alarm.
HACCP alarm. The temperature has reached the value of parameter h1 during a longer period than established in h2 (see page 12). Activates the alarm relay and the audible alarm.
HACCP alarm due to a power supply failure. The temperature established in h1 has been reached, following a power supply failure (see page 12). Activates the alarm relay and the audible alarm.

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Indicates that a defrost is being performed (see page 10). Only displayed on screen.
Password request. See parameters b10 and PAS (see page 13). Only displayed on screen.

Shown sequentially with the temperature: The controller is in demo mode, the configuration has not been made.

8.1 Cold regulation
Solenoid control (COOL Relay) The cooling process is regulated by means of opening / closing the solenoid valve. When the temperature in probe S1 reaches the set point (SP) value plus the probe’s differential (C1), the solenoid opens and causes the temperature to drop. Once the set point (SP) value is reached, the solenoid closes.

S1 SP+C1

SP

Danfoss 80Z8120

Solenoid

ON

Compressor control (Relay AUX 1)
With Pump Down (Inl: 2, 5, 7, 9, 12)
Requires the connection of a low pressure switch in digital input 1. When the temperature in probe S1 reaches the set point (SP) value plus the probe’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 page 8.
Without Pump Down (Inl: 3, 6, 8, 10, 13) 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 probe S1 If probe 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 probe S1 begins to
operate again. C6=1: The compressor is started-up until probe 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 probe error, the device moves to C6=3 mode. C6=3: The compressor operates in line with the times programmed in C7 (ON) and C8 (OFF).

S1 SP+C1
SP Solenoid
Low pressure
switch Compressor
Compressor

ON ON
ON

Danfoss 80Z8122

ON

C7

C8

C7

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Danfoss 80Z8121

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Pump down function This function provides direct control of the solenoid and the compressor and requires the use of a low pressure switch connected to the digital input 1. It prevents pressure problems in the system by ensuring that the compressor operates only when the pressure is within the correct range. Use only if controlling both, the solenoid valve and the compressor. If controlling only the solenoid valve, DO NOT USE THIS SETTING and use any other of the options as it will trigger an error if the low pressure switch is not connected.
This function is only available for Inl options 2, 5, 7, 9 and 12
STOP When the temperature in probe S1 reaches the set point (SP) value, the COOL relay deactivates, closing the liquid solenoid. 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 action isolates all of the refrigerant 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 probe 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 action 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 it will display the “LP” message after 5 minutes.
STAND-BY If the pump down function is active, a certain amount of time may elapse 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.

Danfoss 80Z8123

Liquid solenoid

ON
COOL

OFF

Low pressure D1 ON

switch

OFF

ON
Compressor AUX1
OFF

Pressure in

evaporator

SP

Pressure switch fault

SP+C1

C20 SP

C19 SP+C1

Danfoss 80Z8124

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 probe 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.

S1 SP+C1
SP SP+C10

Solenoid

ON

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Danfoss 80Z8125

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

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 can be activated as follows: · 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.
Parameter C0 allows for correction of the temperature detected by probe 1; this is particularly useful when the probe 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.

EXAMPLE 1: Calibration of probe 1
S1

Configuration I10: 4 I11: 0

(SP+C12)+C1 SP+C1

DIG. IN

SP+C12 SP

D1 Gnd D2 / S3

Set Point change

Solenoid D1

ON D1= OFF

ON D1= ON

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.

OFF-ON (C4=0)
ON COOL
OFF SP

SP+C1 C5

OFF-ON / ON-OFF (C4=1)

ON COOL
OFF

SP C5

SP+C1 C5

Danfoss 80Z8126

8.2 Door management
Door management allows for the installation’s behavior to be controlled, should the cold room door open through parameters C22 and C23.
Parameter C22 defines whether cooling 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 cooling whilst the door is open. If C23=0, cooling does not occur with the door open.

S1 SP+C1
SP Door COOL

Configuration: C22: 1 C23: 5
ON

Management of door frame resistor If the Set Point is equal to or below -4 °C and the relay AUX 2 has been configured as “door frame resistor” (o10=4), the resistor is activated (relay ON) when the temperature of the cold room drops below -3 °C, and is deactivated (relay OFF) when 0 °C is reached.
© Danfoss | Climate Solutions | 2022.07

Open ON
C23
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Danfoss 80Z8127

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

8.3 Defrost
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 (> 37 °F), 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.
Static (InI=11, 12 and 13)
In this type of installation, there are no evaporator fans and defrost is performed by stop cooling.
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) (SSV relay) and another between the compressor output and the evaporator input (B) (DEF relay).

DIG. IN

AUX 1

COOL

FA N

N DEF

SSV

D1 Gnd D2 / S3

N

COND.

D

A

B

C

EVAP.

Danfoss 80Z8128

During the process, the liquid solenoid valve (C) and the condenser input valve are closed and the evaporator input valve is opened, forcing hot gas to pass through the latter and melting the ice.
Optionally, a high pressure switch (D) can be added to control the solenoid valve (digital input D2, l20=9) 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.

H. CRANK.

Reversed cycle (InI=9 and 10) (d7=3)
A 4-way valve is used to invert the refrigeration cycle, using the evaporator as a condenser to melt the ice formed. The process begins by stopping the cooling process (if it is active). If Pump Down is active, defrost begins once the action is complete.
Next, the 4-way valve is activated (DEF relay ON), alongside the solenoid (COOL relay ON) and the compressor (AUX 1 ON), and the defrost process begins. D1 time begins to be counted after the COOL relay is activated.

When defrost is complete, the action can be stopped in two possible ways:
· Pump down active (Inl=9): The solenoid closes (COOL relay OFF) and the 4-way valve returns to its initial position (DEF relay OFF) while the compressor continues to operate (AUX 1 relay ON), until the low pressure switch activates, stopping the compressor (AUX 1 relay OFF), starting the drip time.
· Without Pump Down (Inl=10): The solenoid closes (COOL relay OFF) and the 4-way valve returns to its initial position (DEF relay OFF) and the compressor stops (AUX 1 relay OFF), starting the drip time.

Danfoss 80Z8129

8.4 Defrost control
Defrost start Defrost will start if: · The time programmed in parameter d0 has elapsed since the
start of the last defrost. · We press the key for 3 seconds. · By means of an external push-button (I10 / I11=5).
Defrost completion Defrost will complete if: · The temperature programmed in parameter d4 has been
reached in probe 2. This requires a 2nd probe (l00=2) to be available, located in the evaporator. · The time configured in parameter d1 has elapsed (maximum defrost duration). · We press the key for 5 seconds. · By means of an external push-button (I10 / I11=5).
Drip time This is established through parameter d9 and sets the time added at the end of defrost to allow for the removal of surplus water from melted evaporator ice, during which there is no cooling.

COLD REGULATION S1

Máx.d1 DEFROST

d9

F4

d3

DRIPTIME

COLD REGULATION
FAN START-UP DELAY

“DEF” MESSAGE

d0

DEFROST
d4 SP+C1 SP

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

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.
Note: 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 probe 1 (d2=0), showing the temperature captured by probe 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.

This requires configuration of input 2 as a 2nd evaporator probe (l20=8). In the event of an error in the 2nd evaporator probe, defrost completes once the time defined in d1 has elapsed.
Electric defrosting This requires configuration of relay AUX 2 as 2nd evaporator defrost (o10=5).
Defrost begins simultaneously in both evaporators. When the probe 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 probe 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.

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

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.

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).
Defrost of 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.

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 startup 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.

Danfoss 80Z8130

8.5 Fan control
Fans are controlled through probe 2 (evaporator) and parameters F0 (stop temperature) and F1 (probe differential). If probe 2 is not connected or an error in the probe (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. Parameter C22 defines whether fans stop when the door is opened.

S2 F0 F0-F1
COOL F2=0
Fans F2=1

SP

SP+C1

ON

SP ON
ON

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

8.6 Alarms
The device warns the user through an on-screen message, activation of a relay (only units with 5 relays if o10=1 or units with 4 relays if o00=4) and a sound alarm when the criteria programmed in the parameters are met.
Maximum / minimum temperature alarm It shows the message “AH” or “AL” when the temperature in probe 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).

The alarm can be silenced, but the B alarm icon will not disappear until: · The controller is switched off and then on again. · Defrost without error is started in probe S2. If the 2nd evaporator probe (l20=8) has been enabled, it will behave in the same way, but displaying the message E3.
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” (I10 or I20=1). Activates alarm relay and sound alarm.
HACCP alarm

Note: 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 probe 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 probe 1, and will deactivate when 8 degrees are reached.
External alarm / severe external alarm
The message AE (External alarm) or AES (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 (I10 or I20=2) or as a severe external alarm (I10 or I20=3).
Probe error alarm
If one of the enabled probes is crossed, in open circuit or out of range, the message E1, E2 or E3 will be shown, depending on whether probe S1, S2 or S3 is involved.
Evaporator probe error alarm due to moisture ingress
If, at the start of defrost, the temperature in probe S2 is 20 °C higher than the temperature in probe S1, the controller ignores probe S2 and defrost is instead completed based on defrost time. The display shows the message E2, activates the alarm relay and sound 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 HCP. 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 nonconfirmed HACCP alarm has occurred.
Press the mute key to confirm an HACCP alarm.
If, during a power failure, a HACCP alarm occurs, when the power supply returns, the HACCP alarm is activated and the display shows the messages HCP and PF (power failure) alternately.
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 start-up 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. · Delay to minimum and maximum temperature alarm (A5): This delays the activation of the maximum (A1) and minimum (A2) temperature alarms, from when the temperature in probe 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 open door alarm (A12): This delays the activation of the alarm upon detecting that the door is open.

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Configuration of alarm relay Should any relay have been configured as an alarm relay, parameter A9 allows for the relay status to be defined when an alarm is triggered: · A9=0 Relay active (ON) in the event of an alarm (OFF without
alarm) · A9=1 Relay inactive (OFF) in the event of an alarm (ON without
alarm)
8.7 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 finished by time alarm

8.9 Password
It allows protecting the configuration of the unit using a 2 digit code (from 01 to 99). 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.
8.10 Remote Stand-by mode
DIG. IN

Danfoss 80Z8131
D1 Gnd D2 / S3

The message Adt is displayed when a defrost has completed due to time-out, if parameter A8=1.
Pump down malfunction error (stop)

Remote Stand-by (I10 =8)
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=12).

The message Pd is displayed if a malfunction is detected when the refrigeration system is stopped using the pump down action. (See page 8). Pump down malfunction error (start-up)
Displays the LP message if a malfunction is detected when the refrigeration cycle is started up using the pump down action. (See page 8).
8.8 Light control
Relay AUX 1 or AUX 2 must be configured as “Light” (o00 or o10=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 (I10 or I20=1). The control even occurs with the equipment in Stand-by.

8.11 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 through the parameters menu.
AUX 1 relay · Deactivated (o00=0): It 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 (Inl). · Light (o00=2): This regulates the operation of cold room light.
AUX 2 relay · Deactivated (o10=0): It does not carry out any function. · Alarm (o10=1): This activates the relay every time that an alarm
occurs · Light (o10=2): This regulates the operation of cold room light · Door frame resistor (o10=4): This controls the operation of the
cold room’s door frame resistor. · Defrost 2º evaporator (o10=5): This controls the defrost
resistors of a second evaporator. · 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.

BC419141115574en-000101 | 13

Do not save changes

Danfoss 80Z8132

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

9. 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.

OUT OF PROGRAMMING
20 sec.

IN PROGRAMMING

Temperature control

Parameters OK

Values

3 seg.

Change parameter

Change value
OK

Save changes

20 sec. OK

Parameters

Level 2 Description

SP

Temperature setting (Set Point)

C1

Probe 1 differential (Hysteresis)

d0

Defrost frequency (Time between 2 starts)

d1

Maximum defrost duration (0=defrost deactivated)

d4

Final defrost temperature (by probe) (If I00 1)

F3

Status of the fans during the defrost 0=Shut down; 1=Running

A1

Alarm for maximum in probe 1 (It should be higher than the SP)

A2

Alarm for minimum in probe 1 (It should be lower than the SP)

Values

Min.

Def.

Max.

°C/°F

-50

0.0

99

°C/°F

0.1

2.0

20.0

H.

0

6

96

Min.

0

255

°C/°F

-50

8.0

50

0

1

°C/°F

A2

99

°C/°F

-50

A1

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. · Certain parameters or menus may not be visible depending on the configuration of the rest of the parameters.

Save changes

OUT OF PROGRAMMING
20 sec.
Temperature indication

20 sec.

Level 1 Menus

OK

IN PROGRAMMING

Level 2 Parameters

OK

Level 3 Values

6 sec.

Change menu

Change parameter

Change value
OK

OK OK

20 sec.

Do not save changes

Danfoss 80Z8133

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Regulation and control

Level 1 rE

Level 2 SP C0 C1 C2 C3
C4
C5
C6
C7
C8 C9
C10
C12
C19 C20 C21 C22 C23 C27 EP

Description
Temperature setting (Set Point)
Probe 1 calibration (Offset)
Probe 1 differential (Hysteresis)
Set Point top locking (it cannot be set above this value)
Set Point bottom locking (it cannot be set below this value)
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
Protection delay time (Value of the option selected in parameter C4)
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
Relay time in ON in the event of probe 1 failure (If C7=0 and C80, the relay will always be disconnected in OFF)
Relay time in OFF in the event of probe 1 failure (If C8=0 and C70, the relay will always be connected in ON)
Maximum duration of the continuous cycle mode. (0=deactivated)
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)
Variation of the Set Point (SP) when the change Set Point function is active. (SP+C12 C2) (0= deactivated)
Maximum start time from Pump Down (Values between 1 and 9 seconds will not be accepted) (0=deactivated)
Maximum time for pump down (0= deactivated)
Probe to be displayed 0=All probes (sequential) 1=Probe 1 (Cold Room), 2=Probe 2 (Evaporator), 3=Probe 3 (According to I20)
Stop fans and compressor on opening door 0=No, 1=Yes
Start-up delay for fans and compressor with door open
Probe 3 calibration (Offset)
Exit to level 1

Values °C/°F °C/°F °C/°F °C/°F °C/°F
Min.
Min. Min. H. °C/°F °C/°F Sec. Min.
Min. °C/°F

Min. -50 -20.0 0.1 C3 -50
0
0
0
0
0 0
0
C3-SP
0 0 0 0 0 -20.0

Def. 0.0 0.0 2.0 99 -50
0
0
2
10
5 0
-50
0.0
0 0 1 0 0 0.0

Max. 99 20.0 20.0 99 C2
1
120
3
120
120 48
C3-SP
C2-SP
120 15 3 1 999 20.0

Defrost

Level 1 Level 2 Description

Values

Min.

Def.

Max.

d0

Defrost frequency (Time between 2 starts)

H.

0

6

96

d1

Maximum defrost duration (0=defrost deactivated)

Min.

0

255

Type of message during the defrost:

d2

0=Displays the real temperature; 1=Displays the temperature at the start of

the defrost; 2=Displays the dEF message

0

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

dEF

d5

Defrost on connecting the unit: 0=NO First defrost according to d0; 1=YES, First defrost according to d6

0

1

d6

Delay of the defrost start on connecting the unit

Min.

0

255

d7**

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

1

d9

Drip time when completing defrost (Shutdown of compressor and fans)

Min.

0

1

255

EP

Exit to level 1

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

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Evaporator fans

Level 1 Level 2

F0

F1

F2

FAn

F3

F4

EP

Description Shutdown temperature of fans Probe 2 differential if fans are shut down Shut down fans when the compressor shuts down 0=No, 1=Yes Status of the fans during the defrost 0=Shut down; 1=Running Delay of start-up after defrost (If F3=0) It will only actuate if it is higher than d9 Exit to level 1

Values

Min.

Def.

Max.

°C/°F

-50

45

122

°C/°F

0.1

2.0

36

0

1

0

1

Min.

0

2

99

Alarms

Level 1 Level 2 Description

Values

Min.

Def.

Max.

A0

Configuration of the temperature alarms 0=Relative to SP 1=Absolute

0

1

A1

Alarm for maximum in probe 1 (It should be higher than the SP)

°C/°F

A2

99

A2

Alarm for minimum in probe 1 (It should be lower than the SP)

°C/°F

-50

A1

A3

Delay of temperature alarms in the start-up

Min.

0

120

A4

Delay of temperature alarms from the end of a defrost

Min.

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

AL

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

120

0

120

A8

Show warning if the defrost ends for maximum time, 0=No, 1=Yes

0

1

Relay alarm polarity

A9

0= Relay ON in alarm (OFF without alarm); 1= Relay OFF in alarm (ON

without alarm)

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 b00 b01

b10

PAS

bcn

b20

b21

b22 Unt EP

Description Delay of all functions on receiving power supply Cold room light timing Function of password 0=Inactive, 1=Block access to parameters, 2=Block keypad Access code (Password) MODBUS address Communication speed: 0=9600 bps, 1=19200 bps, 2=38400 bps, 3=57600 bps Acoustic alarm enabled: 0= No, 1=Yes Work units: 0=ºC, 1=ºF Exit to level 1

Values

Min.

Def.

Max.

Min.

0

255

Min.

0

999

0

2

0

99

1

247

bps

0

3

0

1

0

1

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Inputs and outputs

Level 1 Level 2 Description

Values

Min.

Def.

Max.

I00

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

1

2

I10**

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

Configuration of digital input 2

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

I20

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

In0

6=Defrost block, 7=Register probe, 8=Probe 2° evaporator,

9=High pressure switch for Hot Gas, 10=Remote Stand-by

0

10

I21

Polarity of the digital input 2 0=Activates on closing contact; 1=Activates on opening contact

0

1

O00**

Configuration of relay AUX1 0=Deactivated, 1=Compressor/Resistor sump, 2=Light, 3=Virtual control, 4=Alarm (only AK-RC 204B)

0

4

Configuration of relay AUX2

O10

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

HACCP alarm

Level 1 Level 2 Description

Values

Min.

Def.

Max.

h1

Maximum temperature of HACCP alarm

°C/°F

-50

99

HCP

h2

Maximum permitted time for activation of the HACCP alarm (0=Disabled)

H.

0

255

EP

Exit to level 1

Information (reading only)

Level 1 Level 2 Description

InI

Option chosen in the configuration wizard

Pd** Pump down active? 0=No, 1=Yes

PU

Program version

Pr

Program revision

tid

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).

Values

Min.

Def.

Max.

BC419141115574en-000101 | 17

User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

Messages

A

R

Pd

Pump down malfunction error (Shutdown)

LP

Pump down malfunction error (Start-up)

E1/E2/E3 Probe 1/2/3 failure (Open circuit, crossed circuit or temperature outside the limits of the probe)

Ad0

Open door alarm. Only if the door stays open for a greater time than is indicated in parameter A12

AH

Maximum temperature alarm in control probe. The temperature value programmed in A1 has been reached

AL

Minimum temperature alarm in control probe. The temperature value programmed in A2 has been reached

AE

External alarm activated (by digital input)

AES

Severe external alarm activated (by digital input)

Adt

Defrost alarm concluded due to time-out. The time established in d1 has been exceeded

HCP

HACCP alarm. The temperature has reached the value of parameter h1 during a longer period than has been established in h2

hCP + PF

HACCP alarm due to a fault in the power supply. The temperature established in h1 has been reached following a fault in the power supply

dEF

Indicates that a defrost is being performed

PAS

Access code (Password) request. See parameters b10 and PAS

S1 – S2

Shown sequentially with the temperature: The controller is in demo mode, the configuration has not been made.

A: Activates the acoustic alarm R: Activates the alarm relay

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User Guide | Temperature controller for walk-in coolers and freezers, Type AK- RC 204B, 205C

10. Technical specifications

Features

Power supply

Maximum input power in the operation

Maximum nominal current

NO Relay DEFROST – SPDT – 20 A
NC

Relay FAN – SPST – 16 A

Relay COOL – SPST – 16 A

NO Relay AUX 1 – SPDT – 20 A
NC

NO Relay AUX 2 – SPDT – 16 A
NC

No. of relay operations

Probe temperature range

Resolution, setting and differential

Thermometric precision

Loading tolerance of the NTC probe at 25 °C

Working ambient temperature

AK-RC 204B AK-RC 205C

Storage ambient temperature

Protection degree

Pollution degree

Control device classification

Temperature during ball-pressure test
Current of radio jamming suppression tests Voltage and current as per EMC tests Type of assembly MODBUS address Dimensions Internal buzzer

Specifications 230 V~ ± 10%, 50 Hz ± 5% 6.3 VA 15 A EN60730-1: 15 (15) A 250 V~ EN60730-1: 15 (13) A 250 V~ EN60730-1: 12 (9) A 250 V~ EN60730-1: 12 (9) A 250 V~ EN60730-1: 15 (15) A 250 V~ EN60730-1: 15 (13) A 250 V~ EN60730-1: 12 (9) A 250 V~ EN60730-1: 10 (8) A 250 V~ EN60730-1:100.000 operations -58 +99.9 °C 0.1 °C ±1 °C ±0.4 °C -10 +50 °C -10 +45 °C -30 +60 °C IP65 II s/ EN 60730-1 Built-in assembly, with Type 1.B automatic operation action feature, for use in clean situations, logical support (Software) class A and continuous operation.
Double isolation between power supply, secondary circuit and relay output. Accessible parts: 75 °C Parts which position active elements: 125 °C 270 mA 207 V, 17 mA Fixed internal Shown on label 290 mm (W) x 141 mm (H) x 84.4 mm (D) Yes

BC419141115574en-000101 | 19

11. Ordering

Controller Model

Description

AK-RC 204B AK-RC 204B Gen. 2,5 O/P, Single phase

AK-RC 205C AK-RC 205C Gen. 2,5 O/P, Single phase

Comments
Includes: · 1 x 1.5 m, NTC 10K sensor · 1 x 3 m, NTC 10K sensor

Code no. 080Z5001 080Z5002

Accessories (for spares and replacement purposes):

Name

Features

3.5 m, NTC 10K Sensor