Compressor casing resistances
Connect the compressor oil heating resistances at least 8 hours
before the compressor is to be started:
at the first unit start-up
after each prolonged period of inactivity
1 Power the heaters.
2 Check the power consumption of the resistances to make sure
that they are functioning.
3 Start-up the compressor only if the crank-case temperature on
the lower side is be higher than the outside temperature by
at least 10°C .
4 Do not start the compressor with the crankcase oil below
operating temperature.
Voltage
Check that the air and water temperatures are within in the
operating limits.
Start-up the unit.
While the unit is operative, i.e. in stable conditions nearing
operating ones, check:
Power supply voltage
Total absorption of the unit
Absorption of the single electric loads
Remote controls
Check that the remote controls (ON-OFF etc) are connected and,
if necessary, enabled with the respective parameters as indicated
in the “electrical connections” section.
Check that probes and optional components are connected and
enabled with the respective parameters (“electrical connections”
section and following pages).
Pump manual start
To be done only during the course of the first start-up, for flow
switch/differential pressure switch test.
To start the pump, connect as in fig. 2.
At the end of the test, restore the connection as in fig. 1.
Scroll compressor
Scroll compressors have only one rotation direction.
In the event it is reversed, the compressor is not immediately
damaged, but increases its noise and jeopardises pumping.
After a few minutes the compressor shuts down due to the
thermal protection tripping.
In this case, disconnect the power supply and invert 2 phases on
the machine power supply.
Do not let the compressor work for a long time with opposite
rotation: more than 2-3 of these abnormal start-ups can damage
it.
To ensure the rotation direction is correct, measure the
condensation and suction pressure.
The pressures must significantly differ: upon start-up, the suction
pressure decreases while the condensation one increases.
