26
®
Start-up
PRELIMINARY CHECKS: WATER SYSTEM
A = Expansion tank 12 Lt.
B = Expansion tank 16 Lt.
C = Expansion tank 18 Lt.
- Check that the water circuit has been filled and pressurised. The pressure value near the unit with the system off must be at least
around 150KPa greater than atmospheric pressure. (If the unit is connected to a pumping unit, see the Pumping unit manual)
- Check that the water connections are correct (see the section on "Water connections")
- Check that there is no air in the circuit. If required, bleed it using the vent valves in the system.
- Check that the temperature of the fluid is less than or equal to the max value allowed according to the information provided in the
"General" section under the heading "Operating limits".
- Check that the shut-off valves in the circuit are in the "OPEN" position.
- Check that the circulating pump is operating and that the flow-rate is at least sufficient to ensure that the WATER DIFFERENTIAL
PRESSURE SWITCH or FLOW SWITCH are NOT activated
- Check that the weight of the water connections is suitably supported by the outside of the unit. There must be no stress on the
exchanger connections.
N.B.: The water flow alarms are only measured if the control system requires the operation of the pump. When the unit is OFF, the
alarm (no flow) is not shown. This can only be tested when the unit is started.
CHECKS ON SAFETY DEVICES, WATER SIDE (DIFFERENTIAL PRESSURE SWITCH / FLOW SWITCH)
Slowly close the ball valve installed downstream from the exchanger, until the pressure switch is activated and the unit shuts-down as
a consequence.
Open the ball valve again, and check that the unit is correctly enabled for operation.
NOTE:
The checks on the differential pressure switch / flow switch safety devices must be carried out with extreme care, without ever
completely cutting off the flow of water (risk of frost on the exchanger)
NITROGEN CUSHION SETTING IN THE EXPANSION VESSEL ACCORDING TO THE CAPACITY OF THE GLOBAL INTALLATION
200
400
600
800
10 0 0
12 0 0
14 0 0
1.5 2 2.5 3 3.5 4 4.5 5
A
B
C
lt
bar
START-UP
After having carefully performed the operations described above, the unit can be started.
Open all the taps in the refrigerant circuit (if present).
Check the values of the various accessible parameters, referring to the "Control" section in this manual.
Reset any alarms using the ON OFF / ALARM button.
CAUTION
Scroll compressors rotate in one direction only. If it is reversed, the compressor will not be damaged, however noise will increase and
pumping will be affected. After a few minutes the compressor will be shut-by the thermal cut-off device. In this case, disconnect power
and reverse 2 phases on the power supply to the machine. Also check the correct direction of rotation of the fans (if present). Do not
operate the compressor too long with reverse rotation. Starting it more than 2-3 times in this condition may damage it).
To check that the direction of rotation is correct, simply measure the condensing and inlet pressures. The pressure must change quite
noticeably.
N.B.: The phase monitor is available as an option.
CLEANING THE IMPURITIES COLLECTOR
The dirtying of the filter causes always the reduced flow-rate of the fluid and possible machine operating problems.
When the unit is started for the first time, impurities in the system water may collect in the filter, causing the symptoms described
above.
Restore correct operation by cleaning the filter.
N.B.: The unit is fitted with a pressure switch that checks for the presence of water in the circuit, and enables the pump only if there is
pressure in the circuit for a minimum safety time.
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