Astralpool CDP Serie Manual Técnico. Puesta En Marcha Y Funcionamiento página 40

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1.- Connect the main line of the gauge to the R-407 bottle stopcock.
2.- Open the bottle stopcock and purge the section of tubing.
3.- Open the high-pressure valve.
4-. Pressurise the equipment to equal the pressure of the bottle.
5.- Close all gauge valves.
6.- Start the machine. The low-pressure switch may be activated. To continue with the
charge, you must disconnect the low-pressure switch in the electrical panel (just while the charging
operation is underway).
7.- Open the low-pressure valve until the pressure is above the trip point of the low-
pressure switch.
8.- Once in a while, close the LO valve of the gauges in order to confirm the real pressure
of intake.
9.- Verify that the outflow pressure is not above the normal range for normal working
conditions.
10.- When the correct weight of refrigerant has been charged, close the LO valve.
11.- When the equipment is functioning according to the specified working conditions,
close the valve of the charging bottle and disconnect the tubes taking precautions regarding gas
purge.
12.- Place the caps on the supply and return lines of the compressor.
Detecting Leaks:
Leaks may appear due to various reasons. Leakage risk may be greatly reduced if the
equipment is correctly installed by qualified personnel and by taking certain precautions in the
assembly of the equipment.
The following points are especially important:
* Good welding technique.
* Use of antivibration tools.
* Use of top-quality components and tools designed specifically for the pressure and
temperature conditions of the equipment.
Symptoms of a leak
Leaks will cause a decrease in the refrigerant charge in the equipment. Low refrigerant
charge may be the cause of:
The temperature of the evaporating unit is too low. This may be caused by an
obstructed fluid line or the incorrect operation of a capillary. The consequences may be
very serious, for example ice may form on evaporating unit, etc.
The compressor is functioning on cycles which are too short. This may also be due to
incorrect functioning of control humidistat.
Compressor is overheated: low gas charge makes for insufficient flow of vapours to
cool the compressor. This may cause the tripping of the internal thermal indicator of the
compressor.
The compressor operates continuously, there is not enough refrigerant to obtain the
desired results, and since the specified temperatures are not reached, the equipment
does not shut down.
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