Air cooled water chillers and heat pumps
with radial fans
IDRA - RSC Series
Use, installation and maintenance manual
22
GB
Preliminary checks - hydraulic circuit
- v
erify the correct connection between the unit and the plant pipes;
- verify that the hydraulic shut-off valves are open;
- verify that the plant is charged;
- release all the air from the plant;
- verify that the circulation pump is working and the rotation direction is clockwise;
- verify that the water fl ow conform to the design one
; be sure the water fl ow is always steady
.
Preliminary checks - cooling circuit
Check the components of the cooling circuit. Verify that the compressors lubricant is at the correct level at the half of the
sight glass.
Start-up
Turn the main switch on the electric board to “ON”. Depending on the model, proceed as follows:
- IDRA - RSC F: push the “on/off” button on the keyboard (downwards arrow for 2÷3 sec.); verify there are no alarms
on the display.
- IDRA - RSC H: push the “on/off” button on the keyboard and select the operating mode (chiller or heat pump) by the
“MODE” button on the keyboard; verify the remote on/off contacts are bridged and there are no alarms on the display.
The F-H units start to operate 3 minutes after the signal given on the inlet water temperature.
WARNING! The rotation direction of the scroll compressors is very important; if the phase sequence is uncorrect
they rotate on the wrong side becoming loud and risking serious damages. In this case change immediately the pha-
se sequence. To verify the correct rotation direction, connect the pressure switches to the pressure gauges, correct
evaporation and condensing pressure values should be read.
Running condition
The microprocessor control in F-H units controls the cooling capacity on the plant thermal load. Verify the water inlet and
outlet temperatures: the difference between those two values should not exceed 7°C. Low water fl ow or air through the
plant may cause a higher temperature difference.
An external signal (room thermostat) controls the compressor switch on and off for the condensing units (MF-MH).
Unit switch on and switch off
Push “on/off” button on the microprocessor board (downwards arrow for 2-3 sec.) or open the remote on/off contacts.
During long stop periods disconnect the unit through the main switch on the electric board.
