Maintenance
67
CS3000 AWP – 6721852570 (2023/04)
Fig. 97 Do not step on the surface of the appliance
Table 59 Intervention frequency (months)
* Refer to the local regulation. Companies and technicians performing
installation, maintenance/repair, leak control and recovery operations
must be certified as set out by the local regulations.
Standby mode
If foreseen a long period of inactivity; turn off the power, in order to
prevent the risk of freezing (use glycol or empty the system). Also
disconnect the voltage to avoid electric risks or damages following
lightning.
With lower temperatures keep heaters turned on in the electrical panel
(option).
It is recommended to have a qualified technician start the system after a
period of inactivity, especially after seasonal stops or for seasonal
switch-overs.
When starting, follow the instructions in the “start-up” section.
Schedule technical assistance in advance to avoid hitches and to
guarantee that the system can be used when required.
System drain
Avoid draining the system periodically because it can generates a
corrosive phenomena. Drain the system only if necessary.
To drain the system, follow the steps:
▶ Empty the system;
▶ Empty the exchanger, use all shut-off valves and grub screws;
▶ Blow the exchanger with compressed air;
▶ Dry the exchanger with hot air; for greater safety, fill the exchanger
with glycol solution;
▶ Protect the exchanger from air;
▶ Take the drain caps off the pumps;
▶ Be sure that no water is inside the pipes due to frost damages.
Any anti-freeze liquid contained in the system should not be discharged
freely as it is a pollutant. It must be collected and reused.
It is recommended to have a qualified technician start the system after a
period of inactivity, especially after seasonal stop or for seasonal switch-
overs.
Consider to wash the system before start-up.
When starting, follow the instructions in the “start-up” section.
Schedule technical assistance in advance to avoid hitches and to
guarantee that the system can be used when required.
Water side heat exchanger
The exchanger must be able to provide the maximum thermal exchange.
Therefore it is essential for the inner surfaces to be clean of dirt and
build-up.
Periodically check the difference between the temperature of the supply
water and the condensation temperature: if the difference is greater
than 8°C–10°C it is advisable to clean the exchanger.
The clearing must be performed:
• With the circulation opposite to the usual one;
• With a speed at least 1,5 times higher than the nominal one;
• With an appropriate product moderately acid (95% water + 5%
phosphoric acid);
• After the cleaning rinse with water to inhibit the action of any residual
product.
CAUTION
Dirt trap
▶ Check that no impurities prevent the correct passage of water.
Consider that the flow switch controls the operations and remove
incrustations from the palette.
Unit booklet
Keep a unit schedule to keep trace of the interventions made on the unit.
It will become simple to adequately schedule the various interventions
and facilitate any troubleshooting.
6 12
1 Sign of corrosion x
2 Panel fixing x
3 Fan fixing x
4 Coil cleaning x
5 Water filter cleaning x
6 Water: quality, pH, glycol concentration x
7 Check exchanger efficiency x
8 Circulation Pump x
9
Check of the fixing an the insulation of the
power lead
x
10 Earth cable check x
11 Electric panel cleaning x
12 Power remote controls status x
13 Clamp closure, cable isolation integrity x
14
Voltage and phase unbalancing (no load and on-
load)
x
15 Absorptions of the single electrical loads x
16 Compressor casing heaters test x
17 Checking for leaks * *
18 Cooling circuit work parameter detection x
19 Safety valve * *
20
Protective device test: pressure switches,
thermostats, flow switches, etc.
x
21
Control system test; set point, climatic
compensations, capacity stepping, air flow-rate
variations
x
22
Control device test: alarm signalling,
thermometers, probes, pressure gauges, etc.
x
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