Regulation is based on the set value plus a displacement, if applicable. The value is set via a push on the centre button.

The set value can be locked or limited to a range with the settings in r02 and r03.

The reference at any time can be seen in ”u28 Temp. ref”.

When the temperature is higher than the reference + the set differential, the compressor relay will be cut in. It will cut out again when the temperature comes down to the set reference.

The controller’s setting range for the setpoint may be narrowed down so that much

too high or much too low values are not set accidentally, with resulting damage.

If the temperature of the products and the temperature received by the controller are not identical, an offset adjustment of the display temperature can be carried out.

Here you set whether the controller display is to show temperature values in °C or in °F.

°C=0. / °F=1

Compensation possibility through a long sensor cable

With this setting, refrigeration can be started, stopped, or a manual override of the outputs can be allowed.

Start / stop of refrigeration can also be accomplished with the external switch function connected to a DI input.

Stopped refrigeration will give a ”Standby alarm”.

1: Start

0: Stop

-1: Manual control of outputs allowed

The thermostat’s reference will be the setpoint plus this value when the controller changes over to night operation. (Select a negative value if there is to be cold ac- cumulation.)

When the function is changed to ON, the thermostat reference will be displaced by the value in r40. Activation can also take place via input DI1 or DI2 (defined in o02 or o37).

The thermostat reference and the alarm values are shifted by the following number of degrees when the displacement is activated. Activation can take place via r39 or input DI

If one of the two limit values is exceeded, a timer function will commence. The alarm will not become active until the set time delay has been passed. The time delay is set in minutes.

The time delay is set in minutes.

The function is defined in o02 or o37.

This time delay is used during start-up, during defrost and immediately after a defrost. There will be change-over to the normal time delay (A03) when the temperature has dropped below the set upper alarm limit. The time delay is set in minutes.

Here you set the alarm limit for the high temperature alarm. The limit is set in °C (absolute value).

During night conditions, the limit value will be changed to the same value as the night offset. The change will only be applied for a positive night offset.

The limit value will also be changed in connection with reference displacement r39.

Regardless, whether this is positive or negative.

Here, you set the alarm limit for low temperature alarms. The limit value is set in °C (absolute value).

During night conditions, the limit will remain unchanged, while a reference

displacement r39 will increase or decrease the limit with the value given by r40.

A cut-out/cut-in input will result in an alarm when the time delay has passed. The function is defined in o02.

A cut-out/cut-in input will result in an alarm when the time delay has passed. The function is defined in o37

Setpoint for the condenser temperature alarm, the warning level without compressor stop. The alarm will clear when the condenser temperature is decreased to the value defined in parameter A78.

Setpoint for the condenser block alarm. Activation of this alarm can trigger an action

– light off, compressor stop, or both (see parameter P92)

The alarm will clear when the condenser temperature is decreased by 2 times the value defined in parameter A78.

Delay for the condenser block alarm and potential action.

The delay starts when the condenser temperature exceeds the limit in parameter A54.

Difference band below the condenser alarm temperature settings (A37 and A54) for clearing the alarms.

To prevent irregular operation, values can be set for the time the compressor is to run once it has been started, and for how long it at least has to be stopped.

The running times are not observed when defrosts start.

Settings indicate the time that has to elapse from the first relay cuts in and until the next relay has to cut in.

Here you can read the status of the compressor relay, or you can force-control the relay in the ”Manual

control” mode

The timer function starts when voltage is connected to the controller, but it is disabled the first time by the setting in d05.

If there is a power failure, the timer value will be saved and will continue from here when the power returns.

This timer function can be used as a simple way of starting defrosts, but it will always act as a safety defrost if one of the subsequent defrost starts is not received.

The controller also contains a real-time clock. By means of settings of this clock and times for the required defrost times, defrost can be started at fixed times of the day. If there is a risk of power failure for periods longer than four hours, a battery module should be mounted in the controller.

Defrost start can also be accomplished via data communication, via contact signals, or manual start-up.

All starting methods will function in the controller. The different functions have to be set so that defrosts do not ”come tumbling” one after the other.

Defrost can be accomplished with electricity or hot gas.

The actual defrost will be stopped based on time or temperature with a signal from a

temperature sensor.

Here you set whether defrost is to be accomplished with electricity, gas, or “non”. During defrost, the defrost relay will be cut in.

1 = El

2 = Gas

The defrost is stopped at a given temperature which is measured with a sensor (the sensor is defined in d10).

The temperature value is set.

The function is zeroset and will start the timer function at each defrost start. When the time has expired the function will start a defrost.

The function is used as a simple defrost start, or it may be used as a safeguard if the normal signal fails to appear.

If master/slave defrost without clock function or without data communication is used, the interval time will be used as max. time between defrosts.

If a defrost start via data communication does not take place, the interval time will be used as max. time between defrosts.

When there is defrost with clock function or data communication, the interval time must be set for a somewhat longer period of time than the planned one, as the interval time will otherwise start a defrost which a little later will be followed by the planned one.

In connection with a power failure, the interval time will be maintained, and when the power returns, the interval time will continue from the maintained value.

The interval time is not active when set to 0.

This setting is a safety time so that the defrost will be stopped if there has not already been a stop based on temperature or via coordinated defrost.

The function is only relevant if you have several refrigeration appliances or groups where you want the defrost to be staggered in relation to one another. The function is furthermore only relevant if you have chosen defrost with interval start (d03).

The function delays the interval time d03 by the set number of minutes, but it only does it once, and this at the very first defrost taking place when voltage is connected to the controller.

The function will be active after each and every power failure.

Here you set the time that is to elapse from a defrost and until the compressor is to start again. (The time when water drips off the evaporator).

Here you set the time that is to elapse from compressor start after a defrost and until the fan may start again. (The time when water is “tied” to the evaporator).

The fan may also be started a little earlier than mentioned under “Delay of fan start after defrost”, if the defrost sensor S5 registers a lower value than the one set here.

Here you can set whether the fan is to operate during defrost. 0: Stopped (Runs during pump down)

1: Running (stopped during “fan delay”)

2: Running during pump down and defrost. After that, it is stopped.

Here you define the defrost sensor. 0: None, defrost is based on time 1: S5

2: Sair

Set the time when the evaporator is emptied of refrigerant prior to the defrost.

Here, the refrigeration time allowed without defrosting is set. If the time has passed, a defrost will be started.

With setting = 0, the function is cut out.

The controller will follow the effectiveness of the evaporator, and via internal calculations and measurements of the S5 temperature, it will be able to start a defrost when the variation of the S5 temperature becomes larger than required.

Here you set how large a slide of the S5 temperature can be allowed. When the value is passed, a defrost will start.

The function can only be used in 1:1 systems when the evaporating temperature will become lower to ensure that the air temperature will be maintained. In central systems the function must be cut out.

With setting = 20, the function is cut out

Controls the readout of “-d-” after defrost, so that “-d-” is shown until the temperature is ok, the set delay has expired, or a temperature alarm becomes active.

You can stop an ongoing defrost in the same way.

Here you can start a manual defrost

Here you can read the defrost relay status or you can force-control the relay in “Manual control” mode.

Shows ON when the controller is operating with coordinated defrost.

1= pump down / defrost

Here you can select whether the fan is to be stopped when the compressor is cut out.

(Yes = Fan stopped)

If you have chosen to stop the fan when the compressor is cut out, you can delay the fan stop when the compressor has stopped.

Here you can set the time delay.

The function stops the fans in an error situation, so that they will not provide power to the appliance. If the defrost sensor registers a higher temperature than the one set here, the fans will be stopped. There will be a restart at 2 K below the setting.

The function is not active during a defrost or start-up after a defrost.

With a setting +50°C, the function is interrupted.

Here you can read the fan relay status, or force-control the relay in “Manual control” mode.

Setting the clock is only necessary when there is no data communication.

In the event of a power failure of less than four hours, the clock function will be saved. When mounting a battery module the clock function can preserved longer.

There is also a date indication used for registration of temperature measurements.

After a power failure, the controller’s functions can be delayed so that overloading of the electricity supply network is avoided.

Here you can set the time delay.

The controller has a digital input 1, which can be used for one of the following functions:

Off: The input is not used

1.     Status display of a contact function

2.     Door function: When the input is open, it signals that the door is open. The refrigeration and the fans are stopped. When the time setting in “A4” is passed, an alarm will be given and refrigeration will be resumed.

3.     Door alarm: When the input is open, it signals that the door is open. When the time setting in “A4” is passed, there will be an alarm.

4.     Defrost: The function is started with a pulse signal. The controller will register when the DI input is activated. The controller will then start a defrost cycle. If the signal is to be received by several controllers it is important that ALL connections are mounted the same way (DI to DI and GND to GND).

5.     Main switch: Regulation is carried out when the input is short-circuited, and regulation is stopped when the input is put in pos. OFF.

6.     Night operation: When the input is short-circuited, there will be a regulation for night operation.

7.     Reference displacement when DI1 is short-circuited. Displacement with “r40”.

8.     Separate alarm function: Alarm will be given when the input is short-circuited.

9.     Separate alarm function: Alarm will be given when the input is opened. (For 8 and 9, the time delay is set in A27)

10.  Case cleaning: The function is started with a pulse signal. Cf.. also a description on.

Definition takes place with the numerical value shown to the left.

(0 = off)

DI state (Measurement)

The DI input’s present status is shown here. ON or OFF.

These settings can only be made when a data communication module has been mounted in the controller and the installation of the data communication cable has been finished.

This installation is mentioned in a separate document, “RC8AC”.

The address is set between 1 and 60 (119), gateway determined. The address is sent to the gateway when the menu is set in pos. ON

IMPORTANT: Before you set o04, you MUST set o61. Otherwise, you will be transmitting-

Ting incorrect data.

If the settings in the controller are to be protected with an access code, you can set a numerical value between 0 and 100. If not, you can cancel the function by setting 0. (99 will always give you access.)

Normally, a Pt 1000 sensor with great signal accuracy is used. But you can also use a sensor with another signal accuracy. That may either be a PTC 1000 sensor (1000 ohm) or an NTC sensor (5000 Ohm at 25°C).

All the mounted sensors must be of the same type.

PTC = 1

NTC = 2

Yes: Gives steps of 0.5° No: Gives steps of 0.1°

When a controller has completed a defrost it will wait for a signal which tells that the refrigeration may be resumed. If this signal fails to appear for one reason or another, the controller will itself start the refrigeration when this standby time has elapsed.

The controller has a digital input 2, which can be used for one of the following functions:

Off: The input is not used.

1.     Status display of a contact function

2.     Door function: When the input is open it signals that the door is open. The refrig- eration and the fans are stopped. When the time setting in “A4” is passed, an alarm will be given and refrigeration resumed.

3.     Door alarm: When the input is open, it signals that the door is open. When the time setting in “A4” is passed, an alarm will be given.

4.     Defrost: The function is started with a pulse signal. The controller will register when the DI input is activated. The controller will then start a defrost cycle. If the signal is to be received by several controllers it is important that ALL connections are mounted the same way (DI to DI and GND to GND).

5.     Main switch: Regulation is carried out when the input is short-circuited, and regulation is stopped when the input is put in pos. OFF.

6.     Night operation: When the input is short-circuited, there will be a regulation for night operation.

7.     Reference displacement when DI2 is short-circuited. Displacement with “r40”.

8.     Separate alarm function: Alarm will be given when the input is short-circuited.

9.     Separate alarm function: Alarm will be given when the input is opened.

10.  Case cleaning: The function is started with a pulse signal. Cf. also description on page 4.

11.  Not used

12.  The input is used for coordinated defrost in conjunction with other controllers of the same type.

1) The relay cuts in during the day operation

2) The relay is to be controlled via data communication

3) The relay to be controlled by the door switch is defined in either o02 or o37, where the setting is selected to either 2 or 3. When the door is opened, the relay will cut in. When the door is closed again, there will be a time delay of two minutes before the light is switched off.

The light relay can be activated here, but only if defined in o38 with setting 2.

The ON period is set as a percentage of the time.

The ON period is set as a percentage of the time.

The period of time for the aggregate ON time + OFF time is set in minutes.

The status of the function can be followed here, or the function can be started manually.

0 = Normal operation (no cleaning)

1 = Cleaning with fans operating. All other outputs are Off 2 = Cleaning with stopped fans. All outputs are off.

If the function is controlled by a signal at the DI1 or DI2 input, the relevant status can

be seen here in the menu.

The controller can be defined in various ways. Here you set which of the 5 applications is required. You can see a survey of applications. This menu can only be set when regulation is stopped, i.e., “r12” is set to 0.

It is possible to select a quick setting of a number of parameters. It depends on whether an application or a room is to be controlled and whether defrost is to be stopped based on time or based on temperature. The survey can be seen on page 22. This menu can only be set when regulation is stopped, i.e., “r12” is set to 0.

After the setting, the value will return to 0. Any subsequent adjustment/setting of parameters can be made, as required.

There is access to adjustments of values, but not to configuration settings. If the settings in the controller are to be protected with an access code, you can set a numerical value between 0 and 100. If not, you can cancel the function by setting 0. If the function is used, access code 1 (o05) must also be used.

With this setting, you save the controller’s actual settings as a new basic setting (the earlier factory settings are overwritten).

Readout of the accumulated controller runtime in days (powered up and main switch on).

Can be cleared or adjusted when the R12 main switch is off.

Days of operation before the Service alarm request. Value = 0 disables the function

0 = Function disabled, 1 = Turn off Light, 2 = Stop compressor, 3 = Light and comp off, 4 = Stop comp, Rail heat and light off, 5 = Comp, Light and RH off

Number of hours for counting events.

Events that are older than the set period are discarded.

The period is defined by parameter P93. Value = 0 disables the function

1=Night

There are two kinds of error reports – it can either be an alarm occurring during the daily operation, or there may be a defect in the installation.

A-alarms will not become visible until the set time delay has expired.

E-alarms, on the other hand, will become visible the moment the error occurs. (An A alarm will not be visible as long as there is an active E alarm.)

Here are the messages that may appear:

1 = alarm

visible, you can see an operating status on the display. Push briefly (1s) the upper button. If there is a status code, it will be shown on the display.

The individual status codes have the following meanings:

(Shown in all menu displays)

PTC 1000 or

NTC-M2020 (5000 ohm / 25 °C)

±0.5 K between -35 – 25 °C

±1 K above 25 °C

±0.005 K per degree

Use auxiliary relays when the cable is longer.

(250 V AC)

Refrigeration

131 VA Pilot

duty

Min. 100 mA**

131 VA Pilot

duty

-40 – 70 °C, during transport

Buttons and packing are embedded in the front.

4 hours

LVD tested acc. EN 60730-1 and EN 60730-2-9, A1, A2

EMC tested acc. EN 61000-6-3 and EN 61000-6-2