Version No. 1-4 - 02.06.2021
Doc. No. 992300110
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The solenoid valve is switched electrically. If the unit power is off, the valve switches to open.
5. Units with temperature controller
The unit is equipped with a temperature controller which regulates the function of the unit. On normal working
conditions the display shows the temperature inside the enclosure. The controller “set point” for the interior of
the enclosure (parameter St / St1) is pre-set at 35°C and can be adjusted b20°C and +50°C.
The High temperature alarm (parameter AH) is preset at 55°C. The High Temperature Alarm relay is delivered
as “normally closed” (H1=1). If you need to change it to “normally open”, please modify value of parameter H1
(H1=2).
Modifying controller parameters
1. Press the SET button for more than 3 sec. (if there are active alarms, mute the buzzer).The display shows the
parameter code ‘PS’ (password).
2. Only for parameters requiring password: Press the SET button to access the password setting, use the UP and
DOWN buttons to scroll the numbers until displaying, “22” (default password to access the parameters), press
the SET button to confirm the password
3. Use the UP and DOWN buttons to scroll the parameters. The LED corresponding to the category of
parameters will be on
4. Press SET to display the value associated with the parameter
5. Increase or decrease the value using the UP or DOWN button respectively
6. Press SET to temporarily save the new value
7. Press the SET button for more than 3 sec. to permanently save the new parameters and exit the parameter
setting procedure.
If no button is pressed for 60 sec. all changes made to the parameters, temporarily saved in the RAM, will be
cancelled and the previous settings restored. The cooling unit manufacturer is in no way liable for any
alterations the customer may make to the factory set parameters, unless the manufacturer has authorized the
customer in writing to change them.
This manual is intended as quick reference for controller, for a full controller manual or if you need to restore
the factory parameters please go to our website to download the full manual or to locate your nearest servicing
office.
6. Units with door switch
The unit can be switched on and of via a door contact switch (optional). When delivered the door contact
terminals are bridged on the female connector. To connect the door contact switch remove the bridge and
connect door contact switch. The contact must be closed when the cabinet door is closed.
11. Maintenance & Cleaning
The unit should have regular functional tests (approx. every 2,000 hours depending on the grade of ambient
pollution).
12. Maintenance
Every unit is given a performance test under load at the factory. The units are largely maintenance-free,
however, the following points should be observed:
1. Fan replacement
Before replacing the fan, the equipment must be switched off from the power supply (pull out mains plug or
connecting cable). The rated life time of the fan is L10 = 30.000 hours under normal operational conditions.
Should it become necessary to replace the fan, remove the support for the fan by loosening the 4 fastening
screws (RK-2114 models only). To detach the fan from the fan support loosen a further 4 screws and the fan
connecting cable.
When connecting the new fan, take care that the correct polarity is maintained.
