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User Instructions Low Temperature Freezers Model UNI/LT
GB USER INSTRUCTIONS Congratulations on your new low temperature freezer. We trust that it will serve you for many years to come. In order to gain optimum benefit from your freezer, please read the following instructions thoroughly and act accordingly. The low-temperature freezers are used for freezing and long-term storing of food products, medical preparations ( vaccines, blood plasm, ect.) and other biological products. products in the freezer when the freezer is operating.
The ice layer is easily removed with a plastic or wooden scraper. Never use a sharp metal object which might will cause damage to the inner liner. The defrosting frequency is determined mainly by two factors the usage pattern (number of lid openings) and the relative humidity. Excess water can be drained out by using the drain water outlet on the front of the freezer. 6. Electrical supply. The electrical supply should always be in accordance with the rating plate on the back of the freezer.
the option of changing the temperature inside the cabinet. 13. External voltage and temperature alarm. Optionally the freezer can be equipped with a battery operated alarm box with connections for external alarm for voltage failure and temperature alarm. The battery should be exchanged every two years. Please note! When commissioning the freezer, the battery must be turned into its correct position. More details on page 17. 14.Dixell controller.
INSTALLING AND OPERATING INSTRUCTIONS GENERAL DESCRIPTION Model XR30C, format 32 x 74 mm, is a digital termostat with off cycle defrost designed for refrigeration applications at normal temperature. It provides two relay outputs, one for the compressor, the other one can be used for alarm signalling or as auxiliary output. The probe input can be selected between PTC or NTC. The instrument has a digital input, for alarm signalling, for switching the auxiliary output or for start a defrost cycle.
FRONT PANEL COMMANDS SET: To display target set point; in pro gramming mode it selects a parameter or confirm an opera tion. HOW TO SEE THE ALARM DURATION AND MAX (MIN) TEMPERATURE If the alarm LED is on, an alarm has taken place. To see the kind of alarm, the max (min) reached temperature and alarm duration do as follows: 1. 2. (DEF) To start a manual defrost (UP) To see the last temperature alarm happened; in program ming mode it browses the parameter codes or increases the displayed value.
3. 4. displayed and the LED starts blinking; To change the Set value push the o or n arrows within 10s. To memorise the new set point value push the SET key again or wait 10s. NOW YOU ARE IN THE HIDDEN MENU. 3. Select the required parameter. 4. Press the “SET” key to display its value (Now only the LED is blinking). 5. Use o or n to change its value. 6. Press “SET” to store the new value and move to the following parameter.
PARAMETERS NOTE: the parameters preceded by dots are in the Hidden Menu. REGULATION Hy Differential: (0,1 ÷ 25,5°C / 1÷255 °F) Intervention differential for set point. Compressor Cut IN is Set Point Plus Differential (Hy). Compressor Cut OUT is when the temperature reaches the set point. • LS Minimum set point: (- 50°C÷SET-58°F÷ SET): Sets the minimum acceptable value for the set point. • US Maximum set point: (SET÷110°C/ SET÷ 230°F). Set the maximum acceptable value for set point.
OA1 Second relay configuration: ALr: alarm; LHt: auxiliary; onF: always on; dEF: do not select it!.; FAn: do not select it!.; AoP Alarm relay polarity: it set if the alarm relay is open or closed when an alarm happens. CL= the relay is closed; oP = the relay is open i1P Digital input polarity: oP: the digital input is activated by opening the contact; CL: the digital input is activated by closing the contact.
DIGITAL INPUTS POLARITY The digital input polarity depends on the “i1P” parameter. i1P=CL: the input is activated by closing the contact. i1P=OP: the input is activated by opening the contact necting cables make sure the power supply complies with the instrument’s requirements. Separate the probe cables from the power supply cables, from the outputs and the power connections. Do not exceed the maximum current allowed on each relay, in case of heavier loads use a suitable external relay.
NOTE: the message “Err” is displayed for failed programming. In this case turn the unit off and then on if you want to restart the download again or remove the “Hot key” to abort the operation. Inputs: 1 NTC or PTC probe. Digital input: free contact Relay outputs: compressor: SPST relay 8(3) A, 250Vac or SPST relay 20(8)A; 250Vac second relay: SPDT relay 8(3) A, 250Vac or Data storing: on the non-volatile memory (EEPROM). Kind of action: 1B; Pollution grade: normal; Software class: A.
DEFAULT SETTING VALUES Label Name Range °C/°F Set Set point HY Differential 0,1-25,5ºC/ 1-255ºF LS+US 3,0/37 2,0/4 LS Minimum set point -50ºC-SET/ -58ºF-SET -50,0/-58 US Maximum setpoint SET-110ºC/ SET-230ºF 110/230 Ot Thermostat probe calibration -12-12ºC/ -120-120ºF 0,0 Ods Outputs delay at start up 0-255 min 0 AC Anti-short cycle delay 0-50 min 1 CCt Continuos cycle duration 0,0-24,0 h 0,0 COn Compressor ON time with faulty probe 0-255 min 15 COF Compressor OFF tim
Factory settings UNI/LT models.
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