Panasonic 140 Installation And Maintenance Manual page 45

17.3.1.4. Air cooled condenser
CAUTION Fin edges are sharp and can cause injury hazard. Avoid contact with them.
Condenser coils are composed of copper tubes and aluminium fi ns. In case of leaks due to damage or shock, the coils must
be repaired by one of the authorized Support Centres. To guarantee the best possible operation of the condenser bank, the
condenser surface must be maintained as clean as possible, and it must be free from foreign materials (leaves, wires, insects,
slag, etc.). A dirty coil will result in an increase in electrical consumption. In addition, condensation pressure could increase and
trigger a high pressure alarm.
Clean the air exchanger using a special product for aluminium-copper coils and rinse with water. Do not use hot water nor
steam, as these may increase the refrigerating fl uid's pressure.
Avoid damaging the aluminium fi ns during cleaning. Never use pressurised water without a wide diffuser.
CAUTION
Concentrated and/or rotating water jets are strictly forbidden.
17.3.2. Hydraulic circuit
17.3.2.1. Plate heat exchanger
Verify the pressure difference between the inlet and the outlet of the plate heat exchanger. If the water pressure and fl ow rate
values do not correspond to the pressure loss curves available in § "Hydraulic pumps curves", page 61, there may be fouling
of the plate heat exchanger. To clean it, use a non corrosive solvent to remove calcareous deposits. The equipment used for
the external water fl ow, the quantity of solvent and safety measures applied must be approved by the company supplying the
cleaning products, or the one performing these operations.
17.3.2.2. Winter protection
A frost protection system is built into the ECOi-W control system. By default when the ECOi-W is in stand-by, the control can
trigger the pump to operate from the anti-freeze resistance of the plate heat exchanger.
CAUTION During winter, the ECOi-W must remain on to ensure protection against frost.
In winter, if a general shutdown of the installation is programmed, there may be a risk that the water in the hydraulic circuit
could freeze.
To prevent any problem, it is recommended to fully drain any circuits not used and to pressurise them with nitrogen or protect
them by adding an anti-freeze solution or other measures.
The anti-freeze concentration must be checked regularly and carefully before each winter season.
The manufacturer waives any liability for damage of a plate exchanger caused by water freezing of water
CAUTION contained inside does not engage the responsibility of the manufacturer with respect to this incident (Low
winter temperature or water start temperature below 5°C in summer mode).
CAUTION: BEFORE CARRYING OUT ANY OPERATION ON THE EQUIPMENT,
CHECK THAT THE ELECTRICAL POWER SUPPLY IS SWITCHED OFF AND
THAT IT CANNOT BE SWITCHED ON INADVERTENTLY.
IT IS RECOMMENDED THAT THE DISCONNECT SWITCH BE PADLOCKED.
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