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CWP-RC 04
Инструкция по эксплуатации Страница: 37

Airwell CWP-RC 04 [37/42] Maintenance

Page 36

Maintenance

If you compare the colour of the indicator to the scale

on the ring of the sight glass, you can calculate the

percentage of humidity of the refrigerant. If it is ex-

cessive, replace the filter’s cartridge, operate the ap-

pliance for 1 day and then check the humidity %

again. When the humidity % is within the pre-deter-

mined range, no other operations are required. If the

humidity % is still too high, replace the dehydrating

filter again, start the unit and operate it for another

day.

9.8 Thermostatic expansion valve

The circuit of the unit is equipped with a thermostatic

expansion valve, with external equalizer.

The valve is shop-calibrated for an overheating of

5°C.

Procedure to check for overheating:

– Measure the suction pressure with the pressure

gauges on the board of the unit o using a pressure

gauge connected to the service valve on the suc-

tion side.

– From the pressure gauge’s temperature scale, mea-

sure the saturated suction temperature (Tsa) which

corresponds to the pressure value.

– Using a contact pressure gauge affixed to the out-

let fitting of the gas of the evaporator, measure the

actual temperature (Tse).

Overheating calculation (S):

S = Tse - Tsa

Overheating is regulated through the thermostatic

expansion valve.

Make the adjusting screw follow a complete turn,

and operate the appliance for five minutes.

Check again and, if necessary, repeat the regula-

tion.

If the expansion valve cannot be regulated, it is prob-

ably broken, and shall be replaced. The replace-

ment must be carried out by a Service Centre.

9.9 Evaporator

Check at regular intervals that the water side of the

heat exchanger is perfectly clean. To do this, mea-

sure the pressure drop, water side (see Section 8) or

measure the temperature of the liquid leaving and

entering the heat exchanger, and compare it to the

evaporation temperature.

To obtain an effective heat exchange, the difference

between the temperature of the leaving water and

the saturated evaporating temperature must be in the

3.5-5°C to R407C. A greater difference would indi-

cate a low efficiency of the heat exchanger (i.e. the

heat exchanger is dirty).

In this case, the heat exchanger must be subjected to

chemical cleaning, an operation that shall be carried

out by authorised engineers.

For other maintenance operations (extraordinary

overhauling, replacement of the heat exchanger

etc.), contact an authorised Service Centre.

Manuale CWP 4.11.2005 11:56 Pagina 36

Airwell CWP-RC 04 [37/42] Maintenance

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