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4.2.4 Refrigerant charge

The EWWD(H) DZ units are designed to operate with R134a refrigerant therefore DO NOT USE other refrigerants.

When you add or remove refrigerant gas, always ensure correct water flow in the evaporator and the

condenser to avoid freezing pipes.

Freeze damage will void the warranty.

The removal of refrigerant and drainage operations has to be made by qualified technicians with the use of appropriate

material for the unit. Improper maintenance can lead to uncontrolled loss of pressure and fluid. Do not discard refrigerant

in the environment. Always use an appropriate waste disposal system.

All units are shipped with a full refrigerant charge. If the unit needs to be recharged in the field, follow these

recommendations. The optimum charge is one that allows the unit to operate with a correct flow of refrigerant in all

conditions.

4.2.5 Check the refrigerant charge

To check whether the unit is operating with the correct refrigerant charge, you should check the following:

1. Bring the machine to maximum load conditions

2. Ensure that the evaporator outlet water temperature is in the range of 6 to 8° C.

3. Verify that the condenser inlet water temperature is between 25 and 32° C.

4. Under the conditions described above, check that:

a) Discharge superheating is between 8 and 15°C.

b) Subcooling is between 4 and 6° C

c) The temperature difference between outlet water and evaporation is comprised between 0.5 and

4° C.

d) The temperature difference between condensation and condenser outlet water is between 1 and

3° C.

5. Make sure the indicator on the liquid sight glass is full.

If one of these parameters exceeds the indicated limits, the machine may require additional refrigerant.

Note: As the unit changes load, the subcooling value changes but will stabilise quickly. The subcooling value slightly

changes as the evaporator and condenser outlet water temperature changes.

A loss of refrigerant can be so small as to have little effect on the circuit, or may be so obvious as to cause the machine to

shutdown triggered by safety protections.

4.2.6 Electrical Installation

The electrical installation involves the application of some general rules as described below:

1. The current absorbed by the compressor must be compared with the nameplate value. Normally, the absorbed

current value is less than the nameplate value that corresponds to compressor absorption at full load at maximum

operating conditions.

2. At least once every three months all the safety checks should be made to intervene to check its functionality. Each

unit, with aging, can change its operating point and this should be monitored to possibly fix or replace it. Pump

interlocks and flow switches should be checked to make sure that they interrupt the control circuit when triggered.