Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
Manual for Refrigeration Servicing Technicians - UNEP - Division of ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
CHAPITRE 4<br />
PAGE 12<br />
4TOPPING-UP<br />
<strong>Servicing</strong> Practices<br />
APITRE 4<br />
E 12<br />
AP-SOLUTION<br />
Using soap-solution<br />
A water-soap solution is the most popular, minimal cost, and one <strong>of</strong><br />
the most effective methods used among servicing technicians.<br />
Applying a soap solution to joints, connections and fittings while system<br />
is running or under a standing pressure <strong>of</strong> nitrogen helps to identify leak<br />
points when bubbles appear, as shown here:<br />
Use <strong>of</strong> soap-solution <strong>for</strong> leak detection<br />
Using an electronic refrigerant detector<br />
Electronic refrigerant detectors contain an element sensitive to a<br />
particular chemical component in a refrigerant. The device may be<br />
battery or AC-powered and <strong>of</strong>ten has a pump to suck in the gas<br />
and air mixture. Often, an audible “ticking” signal, and/or visible<br />
flashing indicating lamp increases in frequency and intensity as<br />
the sensor analyses higher concentrations <strong>of</strong> refrigerant, which<br />
suggests to the operator that the source <strong>of</strong> the leak is closer.<br />
LEAK DETECTOR<br />
Many refrigerant detection devices also have varying sensitivity ranges that<br />
can be adjusted, as shown here:<br />
SENSING<br />
BULB<br />
ON / OFF<br />
SWITCH<br />
Electronic refrigerant detector<br />
ON<br />
BAT.<br />
OFF<br />
FLEXIBLE<br />
PROBE<br />
Many modern refrigerant detectors have selector switches <strong>for</strong><br />
switching between refrigerant types, e.g. chlor<strong>of</strong>luorocarbons<br />
(CFCs), hydrochlor<strong>of</strong>luorocarbons (HCFCs), HFCs or HCs. HCFCs<br />
have less chlorine than CFCs and the sensitivity has to be changed<br />
by the selector switch. When using electronic refrigerant detectors<br />
in a workshop, always ensure good ventilation since sometimes<br />
it gives false signals due to other refrigerants being present in the<br />
surrounding area.<br />
Electronic refrigerant detectors may be used to detect hydrocarbons<br />
(HCs), but the sensitivity may not be adequate, or may need recalibration.<br />
The detection equipment should be calibrated in a<br />
refrigerant-free area. Ensure that the detector is not a potential source<br />
<strong>of</strong> ignition and is suitable <strong>for</strong> hydrocarbon refrigerants.<br />
100<br />
BATTERY<br />
LIFE<br />
INDICATOR
Change language