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SPECIAL MAINTENANCE
Never perform any cleaning operations before having
disconnected the unit from the mains power supply.
Terminals 10, 11, 12 and 13 may be live even when the
unit has been disconnected.
Make sure power is not connected before proceeding
CHEMICAL WASHING
It is recommended to chemically flush the plate heat
exchanger after every 3 years of operation. For instructions
on how to carry out this operation, call the toll free number.
REFRIGERANT GAS CONTENT
The chillers are charged with R410A refrigerant gas and
tested in the factory.
In normal conditions, there should be no need for the Tech-
nical 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 identified and
repaired and the refrigerant circuit recharged.
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.
- Charge the quantity of refrigerant indicated on the unit's
rating plate.
- Always check the superheat and subcooling values, which
should be between 5 and 10 °C and 4 and 8 °C.
- After a couple of hours operation, check that the liquid
indicator indicates a dry circuit (dry-green).
In the event of partial leaks, the circuit must be com-
pletely emptied before being recharged.
The R410A refrigerant must only be charged in the liq-
uid state.
Operating conditions other than rated conditions may
produce considerably different values.
Tightness 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 charged with a
refrigerant other than that indicated. The use of a differ-
ent refrigerant may cause serious damage to the com-
pressor.
Oxygen, acetylene or other flammable or poisonous gas-
es must never be used in the refrigerant circuit as they
may cause explosion or poisoning.
Oils other than those indicated on page 16 must not be
used.
The use of a different oil may cause serious damage to
the compressor.
GB 03/2010 WWR MTD - BWR MTD
A
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