OPERATING AND MAINTENANCE MANUAL
Chapter 6 - Starting
iC 215 ÷ iC 780
29
The data in this manual are not binding and they can be modified by the manufacturer without notice.
Reproduction of this manual is strictly prohibited
EN
ENGLISH
C
HAPTER
6
S
T A R T I N G
ATTENTION
Before starting this type of unit, ensure that all personnel involved have read and understood Chapter 2 “Safety”.
ATTENTION
On starting the unit:
1) If the high pressure alarm trips (b1HP/b2HP/b1hP/b2hP) without the compressor having started, stop the unit
immediately by setting it to off on the controller.
Now check the refrigerant circuit high pressure value.
2) If the Phase Monitor alarm ALc1 trips check the correct phase sequence upline from the unit. The ALc1 alarm may be
generated by tripping of the protections upline from the phase monitor.
1. Check that the unit shut-off valves are open.
2. Check that the tank has been completely filled with water and that the air has been bled out correctly.
3. Check that the ambient temperature is within the range indicated on the unit’s data plate.
4. Use the pressure gauge on the rear panel of the unit to check that the pressure is approximately 0.5 bar (only for
closed hydraulic circuits).
5.Check that the main switch is in the OFF position (“O”).
6.Check that the unit power supply voltage is correct.
7.Power the unit by means of the line protection device.
8.Close the unit’s main switch by setting it to the ON position (“I”).
9.Check that water is flowing through the evaporator.
10. To start the unit perform the following procedure (For more information consult Chapter 7 “Electronic
controller”)
From unit OFF (stand-by) press and release button
to switch the unit on or off in chiller mode. With the unit
on LED
is lit.
11. On three-phase power supply models make sure the compressor operates correctly (no anomalous noise and no
overheating) and check that the fans and the pump (if present) rotate in the correct direction.
If necessary, invert two phase wires of the power supply line.
12. Check that the pressure difference between the pressure gauge reading with the pump running and the reading
with the pump idle is higher than the available pressure head with the maximum pump flow rate. If the difference
is lower this means that the water flow rate is higher than the maximum permissible value. To avoid damaging the
pump increase the pressure drop in the hydraulic circuit, for example by partially closing a shut-off cock on the
pump outlet.
13. Models with high pressure centrifugal/axial flow fans:
Check that the outlet of the fans is correctly directed and that the pressure drops of the air ducting system are
approximately equal to the available pressure value. If the pressure drops are:
- higher, this means that there is a reduction in the flow rate of cooling air with consequent impairment of the
unit’s performance and possible tripping of the thermal cutouts even at relatively low ambient temperatures;
- lower, this means that the air flow rate may be too high creating a situation of potential risk for the fan motor in
the case of a centrifugal fan.
14. If at the time of first startup the ambient temperature is high and the water temperature in the hydraulic circuit is
significantly higher than the operating value (e.g. 25-30°C) this means that the chiller is starting in overloaded
conditions resulting in possible tripping of the protections. To reduce the overload you can progressively close
(without closing it completely!) a valve at the chiller outlet to reduce the flow rate of water passing through it. As
the water temperature in the hydraulic circuit approaches the working value, the valve can be re-opened.