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8 - MAINTENANCE
8.1 GENERAL
Maintenance must be done by authorized centres or by
qualified personnel
The maintenance allows to:
• maintain the unit efficiency
• reduce the deterioration speed to whom every equipment
is subject over time
• assemble information and data to understand the state of
the unit efficiency and avoid possible damages
8.6 WATER EXCHANGER
The inspections should be carried out at least:
• Every year for only the cooling units
• Every six months for the cooling and warming units
The frequency, however, depends on the use.
In the event of frequent use it is recommended to plan
inspections at close intervals:
• frequent use (continuous or very intermittent use, near
the operating limits, etc)
• critical use (service necessary).
8.2 INSPECTIONS FREQUENCY
8.3 UNIT BOOKLET
It’s advisable to create a unit booklet to take notes of the unit
interventions.
In this way it will be easier to adequately note the various
interventions and aid any troubleshooting.
Report on the booklet:
• data
• type of intervention effected
• intervention description
• carried out measures etc.
8.4 PUT AT REST
8.5 WATER FILTER
Check that no impurities prevent the correct passage of water.
8.7 CIRCULATION PUMPS
Verify :
• no leaks
• Bearing status (anomalies are highlighted by abnormal
noise and vibration)
• The closing of the terminals cover and the correct
positioning of the cable glands.
If a long period of inactivity is foreseen:
• Turn off the power in order to avoid electrical risks or
damages by lightning strikes
• avoid the risk of frost (empty or add glycol to the parts of
the system exposed to temperatures below zero, maintain
powered any anti-freeze resistances )
It’s recommended that the starting-up after the stopping
period is performed by a qualified technician, especially after
seasonal stops or seasonal switch.
When restarting, refer to what is indicated in the START-UP
section.
Schedule technical assistance in advance to avoid hitches
and to guarantee that the system can be used when required.
It is very important for the exchanger to be able to provide the
maximum thermal exchange. Therefore, it is essential for the
inner surfaces to be clean of dirt and incrustations.
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 effected :
• With 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 rince with water to inhibe the detergent
rests.
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