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9 - Maintenance
Carefully read the “Safety” section of this manual before carrying
out any maintenance operations.
DANGER
Do not discharge the refrigerant into the
atmosphere while the refrigeration circuits
are being drained. Use appropriate recovery
equipment. When the recovered refrigerant
cannot be re-used, dispose of it in safely, in
accordance with EU and local legislation.
Unless otherwise specified, the operations described below may be
carried out only by a trained maintenance operator.
9.1 General requirements
Units have been designed for continuous operation, providing
that they are subjected to regular maintenance, within the limits
specified in this manual. Each unit must be serviced according to the
programme by the User/Customer, and must be inspected at regular
intervals by the personnel of an authorised Service Center.
It is the responsibility of the User to meet these maintenance
requirements and/or to enter into an agreement with an authorised
Service Center, so as to properly safeguard the operation of the
appliance.
During the warranty period, in case of damage or failures caused
by improper maintenance, manufacturer will not refund the costs
incurred to repair the appliance in its original state.
9.2 Planned maintenance
Maintenance inspections must be carried out according to the
program below, by a qualified person.
As a general rule, units cannot be repaired directly by the user, who
shall not try to service or repair any failures or anomalies identified
during daily inspections. If you are in doubt, please contact an
authorised Service Centre.
Operations
Daily
Weekly
Monthly
Beginning
of season
End of
season
Check the temperature
of the leaving fluid
•
Check the pressure drops
in the heat exchanger
•
Check the insulation of
the heat exchanger
•
Check that terminals are tightened
•
Check that the terminals’
screws are tightened
•
Clean the exterior of the unit
with water and soap
•
Check the operation
of the external flow switches
•
9.3 Evaporator
Check at regular intervals that the water side of the heat exchanger
is perfectly clean. To do this, measure the pressure drop, water side
(see Section 8) or measure the temperature of the liquid leaving
and entering the heat exchanger, and compare it to the evaporation
temperature.
To obtain an effective heat exchange, the difference between the
temperature of the leaving water and the saturated evaporating
temperature must be in the 1 - 4 °C range. A greater difference
would indicate a low efficiency of the heat exchanger (i.e. the heat
exchanger is dirty).
In this case, the heat exchanger must be subjected to chemical
cleaning, an operation that shall be carried out by authorised
engineers.
For other maintenance operations (extraordinary overhauling,
replacement of the heat exchanger etc.), contact an authorised
Service Centre.
9.4 Component substitution
Differential Pressure Switch
In case the differential pressure switch need to be changed, put the
new one with the positive sign (+) at the capillar connected to the
upper port of the heat exchanger
Refrigerant Strainers
In case refrigerant strainers must be changed, install the new one
always in protection of the WHE (the arrow on the filter must be in the
direction entering the unit)
NOTE
The strainers can work in both flow directions
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