Optyma™ Plus Inverter are a perfect solution for typical MBP applications such as food retail, petrol sites & cold rooms etc.
All units are fully wired, factory tested, have one cabinet size and are equipped with one fan.
It is important to ensure the condensing unit capacity at minimum speed (30 rps) will not be higher than the required cooling capacity of the smallest evaporator. Failure to ensure this may be detrimental to the unit in the longer term.
The Optyma™ Plus Inverter is equipped with a IPM (Interior Permanent Magnet) motor. The compressor should never be operated without a frequency converter as it would be destroyed immediately if connected directly to the public network.
It is extremely important to select the correct suction line insulation thickness in order to:
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Avoid high superheat during high ambient conditions that can create high discharge temperatures.
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Avoid low superheat during low ambient conditions that can cause the refrigerant to condensate in suction line.
Protection and features:
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Electronic thermal compressor protection against overload.
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Temperature monitoring of the heat sink ensures that the frequency converter trips in case of overtemperature.
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The frequency converter is protected against short-circuits between compressor terminals U, V, W.
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When a compressor phase is missing, the frequency converter trips and issues an alarm.
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When a mains phase is missing the frequency converter trips or issues a warning (depending on the load).
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Monitoring of the intermediate circuit voltage ensures that the frequency converter trips when the intermediate circuit voltage is too low or too high.
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The frequency converter is protected against ground faults on compressor terminals U, V, W.
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Occurring alarms will be shown in the controller display and by the red LED in front of the frequency converter.
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The root cause of an individual alarm can be shown with an optional LCP (local control panel, code 120Z0581) or the MCT10 setup software.
Emergency running without controller:
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If the controller fails the condensing unit can be operated when the controller standard wiring (WD1) is modified to temporary wiring as described in the application guidelines. (authorized electricians only to apply any modifications)
EMC compliance:
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All necessary actions are taken to secure EMC compliance of complete condensing unit.
Warning - working on unit that has been switched OFF:
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Frequency converters have DC-link capacitors that remain charged even when the frequency converter is not powered.
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To avoid an electrical hazard disconnect AC mains & wait 15 min for the capacitors to fully discharge before work on unit.
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Failure to wait for the specified time to expire after power is terminated to the unit could result in serious injury or death.
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Note: Digital inputs are not a safety switch & do not disconnect the frequency converter from the mains.
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Do not remove mains connections, compressor connections or other power connections while the frequency converter is still connected to power.
Leakage Current:
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The ground leakage current from the frequency converter exceeds 3.5 mA. According to IEC 61800- 5-1 a reinforced Protective Earth connection must be ensured with a min. 10 mm2 Cu or an additional PE wire – with the same cable cross section as the mains wiring - must be terminated separately.
Residual Current Device:
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This product can cause a DC current in the protective conductor. Where a residual current device (RCD) is used for extra protection only an RCD of Type B (time delayed) shall be used on the supply side of this product.
Phase sequence:
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Optyma™ Plus INVERTER units are equipped with variable speed scroll compressors for which proper phase sequence is compulsory in order to secure rotation in right direction and therefore compression. The phase sequence has to be secured between the drive and compressor. (The phase sequence between network and unit drive is of no influence on the compressor rotation direction).
Unit start up:
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The condensing unit controller is factory set for R449A (change as required – see application guide) for quick installation and start up. The compressor drive is fully managed by the condensing unit controller and therefore all parameters settings should be done only via condensing unit controller.
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It is compulsory to energize crankcase and oil separator heaters at least 1 hour before initial start-up and start-up after prolonged shutdown to remove refrigerant in liquid phase from the compressor.
Unit maximum test pressure is 28 bar.
Note: Please read appropriate application guidelines & manuals for more detailed information.