Shutting Down For Long Periods; Routine Maintenance; Extraordinary Maintenance - CLIMAVENETA MICS-C FF Serie Manual De Instalación-Operación-Servicio

SHUTTING DOWN FOR LONG PERIODS

After deactivating the chiller:
• Make sure the remote switch SA1 (if present) is in
the "OFF" position.
• Make sure the remote keyboard (if present) is set to
"OFF".
• Position QF1 and QS1 on OFF.
• Deactivate the indoor terminal units by placing the
switch of each unit in the "OFF" position.
• Close the water valves.

ROUTINE MAINTENANCE

Regular maintenance is fundamental to maintain the ef-
fi ciency of the unit both in terms of operation and energy
consumption.
The Technical Assistance Service maintenance plan
must be observed, with an annual service which includes
the following operations and checks:
• Filling of the water circuit
• Presence of air bubbles in the water circuit
• Effi ciency of safety devices
• Power supply voltage
• Power input
• Tightness of electrical and hydraulic connections
• Condition of the compressor contactor

EXTRAORDINARY MAINTENANCE

CHEMICAL WASHING
You are recommended to chemically wash the plate heat
exchanger after every 3 years of operation. For instruc-
tions on how to carry out this operation, contact De' Lon-
ghi Spa.
REFRIGERANT GAS CONTENT
The chillers are fi lled R410A refrigerant gas and tested
in the factory.
In normal conditions, there should be no need for the
Technical Assistance Service to intervene to check the
refrigerant gas. However, over time, small leaks may
develop at the joints leading to loss of refrigerant and
draining of the circuit, causing the unit to function poorly.
In this case, the leaks of refrigerant must be identifi ed
and repaired and the refrigerant circuit refi lled. Proceed
as follows:
• Empty and dry the entire refrigerant circuit using a
vacuum pump connected to the low and high pressu-
re tap until the vacuometer reads about 10 Pa.Wait
a couple of minutes and check that this value does
not rise to more than 50 Pa.
• Connect the refrigerant gas cylinder or a fi lling cylin-
der to the low pressure line pressure gauge connec-
tion.
• Fill with the quantity of refrigerant gas indicated on
the rating plate of the unit.
English 06/09
18
If there is a possibility that the outside tempe-
rature may drop below zero, there is the risk of
freezing.
The water circuit MUST BE EMPTIED AND CLO-
SED or antifreeze must be added in the proportion
recommended by the manufacturer.
• Checking of operating pressure, superheating and
subcooling
• Cleaning of fi nned coil
• Cleaning of fan grills
• Mesh fi lter cleaning (compulsory)
For units installed near the sea, the intervals
between maintenance should be halved.
• Always check the superheating and subcooling
values. In the nominal operating conditions for the
appliance, these should be between 4 and 8°C re-
spectively.
In the event of partial leaks, the circuit must be
completely emptied before being refi lled.
The refrigerant must only be fi lled in the liquid sta-
te.
Operating conditions other than nominal condi-
tions may produce considerably different values.
Seal testing or identifi cation of leaks must only be
carried out using R410A refrigerant gas, checking
with a suitable leak detector.
The refrigerant circuit must not be fi lled with a re-
frigerant other than R410A. The use of a refrige-
rant other than R410A may cause serious damage
to the compressor. It is forbidden to use oxygen,
acetylene or other fl ammable or toxic gases in the
cooling circuit as they may cause explosions. It is
forbidden to use oils other than those indicated on
page 11. Using other oils may seriously damage
the compressor.
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MICS-C / MICS-CN