Danfoss Optyma AK-RC 251 Installation Manual

Installation Guide
Temperature controller for walk-in coolers
and freezers, Type AK-RC 251
EN : Temperature controller for walk-in coolers and freezers
ES : Controlador de temperatura para cuartos fríos y congeladores
Type AK-RC 251
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.
• 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.
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 1x16/3. The section to be used as wire rated according to local regulations but must never be
less than 14AWG.
Cables for relay or contactor outputs should use 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.
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, gasoline, alcohol or solvents, as this might damage the unit.
© Danfoss | DCS (vt) | 2021.02
ENGLISH
080R9291
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