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06617645-02
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ELECTRICAL CONNECTIONS
Disconnect the electrical supply before undertaking any work on the unit.
All electrical work must be undertaken by suitably qualified personnel
.
The electrical supply must match the nominal electrical data (voltage, phase, frequency) shown on the label
in the front panel of the unit. Power connections must be made in accordance to the wiring diagram enclosed
with the unit and in accordance current local and national regulations. Power cable and line protection must
be sized according to the specification stated on the wiring diagram enclosed with the unit.
The variation in line voltage must not be more than ±5% of the nominal value, whilst the voltage imbalance
between phases must not exceed 2%. If those tolerances are likely to be exceeded, please contact TEV
Ltd., as further protection devices are required.
Electrical supply must be as described, otherwise warranty will be invalid.
START UP
Before start-up
- Check that all power cables are connected in the correct sequence and that all terminals are tight.
- The voltage measured at the R Y B phase clamps must be 400 V ± 5% (or the value given on the rating
plate for special voltages). If the voltage is incorrect, do not proceed.
- Check for any refrigerant leaks using a leak detector. Should a leak be found do not proceed. All leaks
must be rectified and the unit re-charged by trained personnel.
- Check that the crankcase heaters are energised.
Crankcase heaters must be energised at least 12 hours before start up by switching on the unit at
the main switch.
- Verify that heaters are working correctly. After a short warm up period, the compressor crankcase must be
warm to the touch and must have a temperature at least 10K higher than ambient temperature.
- Check that all hydraulic connections have been made correctly and that all information given on the unit's
labels have been observed.
- The system must be filled with water and bled to eliminate any air.
Caution: before starting the unit up, check that all cover panels are correctly located and securely
fastened.
Start up
Please refer to the microprocessor manual enclosed with the unit.
If the unit fails to start:
• Check that the control thermostat is set to the correct value.
• Do not modify any internal wiring, otherwise warranty will be invalidated.
Controls during unit operation
• Check the rotation of the fans. If the rotation is incorrect, disconnect the main switch and change over any
two phases of the incoming main supply to reverse motor rotation:
• Check that water temperature at evaporator inlet is near to the set point of the control thermostat.
• For “K” version units (units with pumps and storage tank) if the motor driven pump is noisy, slowly
close the discharge shut-off valve until normal working conditions are restored.
This trouble may occur when system pressure drop is significantly different from pump available
pressure.