By A C Bryant
Refrigeration gear is a transparent, useful consultant to the set up, trying out and servicing of business and household refrigeration equipment.
Refrigeration technicians, who're poorly supplied with solid reference fabric, will welcome the author's hands-on method. different readers will contain trainees on in-plant classes, construction carrier engineers and upkeep employees within the frozen meals undefined, supermarkets, motels and hospitals. It additionally presents a textual content from NVQs (C&G 6007) and different vocational courses).
This revised variation has been up-to-date all through, and incorporates a new part at the topical topic of other refrigerants and, for the 1st time, a bankruptcy at the rules of air conditioning.
New variation of the normal textual content and reference guide
Ideal for urban & Guilds NVQs and proper BTEC units
New chapters on replacement refrigerants (non - CFC) and air-con now integrated
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Additional info for Refrigeration Equipment
Sample text
9 Set the suction service valve to the operating position and start the plant. 10 Operate the plant until pressures have stabilized. Check the refrigerant charge via the sight glass and operating pressures. 11 Adjust the valve to give the recommended degree of superheating. 12 Remove gauges, cap service valves and carry out a final leak test. 13 Clear the site of debris, oil etc. The system may be evacuated through the gauge port on the compressor. Crack off the suction service valve from the front seat position and allow a small amount of vapour to enter the compressor crankcase.
Restricted refrigerant flow to the evaporator can be caused by the following: 1 A partial blockage may occur in the filter drier, thereby creating a pressure drop in the liquid line. If the sight glass is located after the filter drier, bubbles will be evident. When a sight glass is installed before the filter drier, a pressure drop will exist just the same but bubbles will not be visible. In each case a temperature difference will exist either side of the restriction. 2 An expansion valve filter or screen may be blocked by undesirable substances circulating around the system which have passed through the filter drier, such as moisture or particles of the desiccant in the filter drier.
If acid is present it will change colour, ranging from pink to red according to the degree of acidity in the sample. The system must then be flushed again and the test repeated. Indicator When testing with an indicator it is necessary to charge the system with the liquid solvent ready for flushing and allow to stand for 30 minutes. Then take samples of the solvent, if possible from both the high and the low side of the system. Add the prescribed amount of indicator to the samples and agitate the mixture: examine for a colour change.