SYSTEMP – Installation Operation Manual (IOM SYSTEMP rev.N)

Table Of Contents
107
15.2 FIRST START-UP
WARNING!
Starting up or checking machines with cooling circuit requires the units to be powered on
for at least two hours prior to the arrival of the technician, in order to allow the compressor's
crankcase oil heater to reach working temperature and allow evaporation of any refrigerant
deposited in it and guarantee correct compressor operation.
The crankcase heaters switch on automatically when the machine is powered on.
15.2.1 UNIT SUPPLY
Description Positive Negative
1 Make sure the disconnecting switch is ON (unit powered).
2 Make sure the disconnecting switch of the condenser is ON (condenser powered on).
3 Make sure the phase sequencer is working properly (direct expansion unit).
4 Make sure all electrical utilities of the unit are correctly powered.
15.2.2 TURNING THE UNIT ON
Description Positive Negative
1 Check the setting of the unit Set-point.
2 Check the settings of the microprocessor user parameters.
3 Check unit switch-on with the ON/OFF key.
15.2.3 REFRIGERANT CHARGE OF THE AIR CONDENSED DIRECT EXPANSION CIRCUIT
Description Positive Negative
1 Check the high and low side pressure gauges connection.
2 Make sure the compressor switch is on.
3 Check the evaporation pressure.
4 Check the condensation pressure.
5 Check the overheating of the refrigerant aspirated by the compressor.
6 Check the sub-cooling of the liquid refrigerant.
7 Check that the liquid line lter is not clogged.
8 Check the correct calibration of the condenser speed regulator.
15.2.4 QUANTITY OF REFRIGERANT IN THE CIRCUIT
Description Type Kg
1 Charging refrigerant during the start-up phase.
2 Adding refrigerant on site.