Unit Start Up; Preliminary Checks - Lochinvar AMICUS HT Series Installation, Commissioning And Service Manual

5. UNIT START UP

5.1 Preliminary checks

Before starting the unit the checks detailed in this manual of the electric supply and connections, the hydraulic system and the refrigerant
circuit, should be performed.
Start-up operations must be performed in accordance with the instructions detailed in the previous paragraphs.
If it is required to switch the unit on and off, never do this using the main isolator: this should only be used to discon-
nect the unit from the power supply when the unit is to be permanently off. Isolation will result in no supply for the
crankcase heater and on start up the compressor could be seriously damaged.
5.1.1 Before start-up
Damage can occur during shipment or installation. It is recommended that a detailed check is made, before the
installation of the unit, for possible refrigerant leakages caused by breakage of capillaries, pressure switch con-
nections, tampering of the refrigerant pipework, vibration during transport or general abuse suffered by the unit.
• Verify that the unit is installed in a workmanlike manner and in accordance with the guidelines in this manual.
• Check that all power cables are properly connected and all terminals are correctly fixed.
• The operating voltage between phases R S T is the one shown on the unit labels.
• Check that the unit is connected to the system earth.
• Check that there is no refrigerant leakage.
• Check for oil stains, sign of a possible leak.
• Check that the refrigerant circuit shows the correct standing pressure on the pressure gauges (if present) otherwise use external ones.
• Check that the Shrader port caps are the correct type and are tightly closed.
• Check that crankcase heaters are powered correctly (if present).
• Check that all water connections are properly installed and all indications on unit labels are observed.
• The system must be flushed, filled and vented in order to eliminate any air.
• Check that the water temperatures are within the operation limits reported in the manual.
• Before start up check that all panels are replaced in the proper position and locked with fastening screws.
Do not modify internal wiring of the unit as this will immediately invalidate the warranty.
Crankcase heaters must be powered at least 12 hours before start up (pre-heating period) To do this, isolate the
compressor(s), fans and pump(s) in the electrics box and then switch on the main isolator (heaters are automatically
supplied when the main switch is closed). The crankcase heaters are working properly if, after several minutes, the
compressor crankcase temperature is about 10÷15°C higher than ambient temperature.
During the 12 hours pre-heating period it is also important to check that the label OFF is shown on the display or that
the unit is on stand-by mode. If there is an accidental start-up before the 12 hours pre-heating period has elapsed, the
compressors could be seriously damaged and therefore the warranty will immediately terminate .
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Rev. A 11-2020