How it Works
Danfoss
Loading...
AK-RC 251
Installation guide
16 pgs2.9 Mb0
Operating guide
2 pgs3.5 Mb0
User guide [es]
20 pgs4.32 Mb0
User guide
20 pgs4.17 Mb0
Installation guide
2 pgs523.14 Kb0

Danfoss AK-RC 251 User guide

User Guide
Temperature controller for walk-in coolers and freezers Type AK-RC 251
User Guide | Temperature controller for walk-in coolers and freezers, Type AK-RC 251
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
2 | BC364433930186en-000101 © Danfoss | DCS (vt) | 2021.02
User Guide | Temperature controller for walk-in coolers and freezers, Type AK-RC 251
1. Versions and references
Model Description Power supply Circuit Breaker Protection Contactor
AK-RC 251 5 relay temperature controller
100 – 240 V~
50 – 240 Hz
No No
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 – +68 °F, if the NTC probe is extended to 3,280 ft with at least 20AWG cable, the maximum deviation will be 0.45 °F.
• 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.
• 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.
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: The cold solenoid is active.
Flashing: The solenoid should be active but a delay or
protection is preventing this.
(Refer to the Fan start-up section).
Fixed: Cold room door open.
Flashing: The door has been open for a greater time than
has been defined in parameter A12.
Fixed: Compressor active.
Flashing: The compressor should be active but a delay
or protection is preventing this.
There is an active alarm, but not an active HACCP alarm.
Fixed: HACCP alarm active.
(Refer to the Compressor Protection timing section).
Defrost relay 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
Continuous cycle mode active.
Cold room light active.
delay is preventing this.
(Refer to the Drip time section).
Alarm in progress muted.
Temperature displayed in ° Fahrenheit / ° Centigrade.
Programming mode active.
© Danfoss | DCS (vt) | 2021.02 BC364433930186en-000101 | 3
User Guide | Temperature controller for walk-in coolers and freezers, Type AK-RC 251
80Z8117
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 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 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 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.
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.
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.
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.
• 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)
1
2
3
Danfoss
7
6
5
4
Ø Max.25 mm
4 | BC364433930186en-000101 © Danfoss | DCS (vt) | 2021.02
User Guide | Temperature controller for walk-in coolers and freezers, Type AK-RC 251
CORECORE
1
Danfoss
CORECORE
2
Danfoss
80Z8119
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
• 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.
with a switch of at least 2 A, 230 V, located near the device. The power supply cable will be H05VV-F or NYM 1x16/3. The section to be used will depend on the local standard in force but must never be less than 14AWG.
Cables for relay or contactor outputs should have a section of 14AWG, allow working temperatures equal to or over 158 °F and be installed with as few bends as possible.
The 120/230 V~ wiring must be kept clear of any other external element.
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
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:
Type of installation Parameters
InI
Cold regulation
0 Demo Mode: it displays the temp. but does not regulate or activate relays
1 Solenoid No Electric Yes 0 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 0 1 0 0 0 0 20 1 1 A
5 Solenoid + compressor Yes Air Ye s 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 Ye s
10 Solenoid + compressor No
11 Solenoid No Static No 0 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
Pump Down
Defrost
Reversed
cycle
Reversed
cycle
Evaporator
fans
Yes 1 1 2 7 1 0 0 5 3 0 D
Yes 0 1 2 0 0 0 0 5 3 0 D
Pd
o00 I00 I10 I11 I20 I21 d1 d7 F3
80Z8118
CORECORE
Diagram
to be used
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.
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.
CORECORE
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).
© Danfoss | DCS (vt) | 2021.02 BC364433930186en-000101 | 5
User Guide | Temperature controller for walk-in coolers and freezers, Type AK-RC 251
Wizard parameters list
Pd Pump down active? 0=No 1=Yes
o00 Configuration of relay AUX1
I00 Connected probes 1=Probe 1 (Cold room) 2=Probe 1 (Cold room) + Probe 2 (Evaporator)
I10 Configuration of digital input 1
I11 Polarity of the digital input 1 0=Activates on closing contact 1=Activates on opening contact
I20 Configuration of digital input 2
I21 Polarity of the digital input 2 0=Activates on closing contact 1=Activates on opening contact
d1 Maximum defrost duration (0=defrost deactivated)
d7 Type of defrost
F3 Status of the fans during the defrost 0=Shut down 1=Running
0=Deactivated 1=Compressor/Crankcase heater 2=Light 3=Virtual control
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= 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° evaporator 9=High pressure switch for Hot Gas 10=Remote Stand-by
0=Resistors 1=Air/fans 2=Hot gas 3=Reversal of cycle
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.
6 | BC364433930186en-000101 © Danfoss | DCS (vt) | 2021.02
Loading...
+ 14 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use