UM / UM PLUS
Chillers and inverter air / water heat pumps with axial fans
16
7.7.2
Removal of protective carter for models 12 and 16
The following shows the procedure for removing the protective carter so you can access the terminal block in models 12 and 16.
1)Remove the indicated screws
2) Push down the right side panel
3) Turn the right side panel in the
direction indicated by the arrow to
remove it.
In order to reposition and fix the carter, repeat the procedure on the contrary.
8
START UP
Before start-up:
•
Check out the availability of the supplied wiring diagrams and manuals of installed apparatus.
•
Check out the availability of the electrical and hydraulic diagrams of the plant in which the unit is installed.
•
Check that the shut-off valves of the hydraulic circuits are open.
•
Verify that the hydraulic circuit has been charged under pressure and air vented.
•
Check out that all water connections are properly installed and all indications on unit labels are observed.
•
Ensure that arrangements have been provided to drain the condensate.
•
Check out that all power cables are properly connected and all terminals are hardly fixed.
•
Check that electrical connections are carried out according to the norms in force including grounding.
•
Check out that the voltage is the one shown in the unit labels.
•
Make sure the voltage is within the limits (±10%) of tolerance range.
•
Check out that crankcase heaters are powered correctly.
•
Check out that there is no refrigerant leakage.
•
Check out that all the cover panels are installed in the proper position and locked with fastening screws before start up.
WARNING: The unit must be connected to the electrical network and should be in STAND-BY mode (powered) closing
the general switch in order to operate the crankcase heaters of the compressor for a minimum of 12 hours before
start up. (the heaters are automatically powered when the main switch is switched off). The crankcase heaters are
working properly if, after some minutes, the temperature of crankcase’s compressor is about 10°C ÷ 15°C higher than
ambient temperature.
WARNING: The weight of the pipes doesn’t load unit structure.
WARNING: Never switch off the unit (for a temporary stop) by switching off the main switch: this component should
be used to disconnect the unit from the power supply only for lengthy stoppages (e.g. seasonal stoppages). Besides,
failing the power supply, the crankcase’s heaters are not supplied thus resulting in a possible breakdown of the
compressors once the unit is switched on.
WARNING: Do not modify the internal wiring of the unit otherwise the warranty will terminate immediately.
WARNING: The summer/winter operating mode have to be selected at the beginning of the related season. Frequent
and sudden changes of this seasonal operating mode have to be avoided in order to prevent severe damages to
compressors.
WARNING: When you first install and start-up the unit make sure that the unit is working properly in both cooling
and heating modes.
