CLIMAVENETA MICS FF, Installation, Operating And Service Manual

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MICS / MICS-N
23
English 07/07
Regular maintenance is fundamental to maintain the effi-
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 follow-
ing operations and checks:
- Filling of the water circuit
- Presence of air bubbles in the water circuit
- Efficiency of safety devices
- Power supply voltage
- Power input
- Tightness of electrical and hydraulic connections
- Condition of the compressor contactor - Checking of operating pressure, superheating and sub-
cooling
- Cleaning of finned coil
- Cleaning of fan grills
- Mesh filter cleaning (compulsory)
For units installed near the sea, the intervals between
maintenance should be halved.
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’
Longhi Spa.
REFRIGERANT GAS CONTENT
The chillers are filled R410A refrigerant gas and tested in the facto-
ry. In normal conditions, there should be no need for the Technical
Assistance Service to intervene to check the refrigerant gas. How-
ever, 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 identified and
repaired and the refrigerant circuit refilled. Proceed as follows:
- Empty and dry the entire refrigerant circuit using a vacuum
pump connected to the low and high pressure 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 filling cylinder
to the low pressure line pressure gauge connection.
- Fill with the quantity of refrigerant gas indicated on the
rating plate of the unit.
- Always check the superheating and subcooling values. In
the nominal operating conditions for the appliance, these
should be between 4 and 8°C respectively.
In the event of partial leaks, the circuit must be
completely emptied before being refilled.
The refrigerant must only be filled in the liquid state.
Operating conditions other than nominal condi-
tions may produce considerably different values.
Seal testing or identification of leaks must only be
carried out using R410A refrigerant gas, checking
with a suitable leak detector.
The refrigerant circuit must not be filled with a
refrigerant other than R410A. The use of a refrigerant
other than R410A may cause serious damage to the
compressor.
Oxygen, acetylene or other flammable or poi-
sonous gases must never be used in the refrigerant
circuit as they may cause explosion.
Oils other than those indicated on page 12
must not be used. The use of different oils may
cause serious damage to the compressor.
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
If there is a possibility that the outside tempera-
ture may drop below zero, there is the risk of freez-
ing.
The water circuit MUST BE EMPTIED AND
CLOSED or antifreeze must be added in the pro-
portion recommended by the manufacturer.
ROUTINE MAINTENANCE
EXTRAORDINARY MAINTENANCE
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