By Rex Miller
Air-con and Refrigeration is helping you recognize todays cooling and weather regulate systems-so expertly that you should use it because the starting place for a profession! transparent instructions-with over 800 photos and illustrations-offer step by step advice to studying the exchange for college kids, pros, and owners who are looking to do their very own installations or repairs.
LEARN WITH THE PROS
Written by means of skilled lecturers Rex and Mark R. Miller-whose Carpentry & building has been a development vintage for greater than 25 years-Air Conditioning and Refrigeration has the entire task-simplifying info you would like for any venture. within the renowned Miller kind, this entire and present consultant helps:
•New and pupil technicians. construct on-the-job abilities and the information had to reach a fast-growing, profitable field.
•AC and refrigeration execs. Refine and replace talents, with complete details at the most modern cost-cutting applied sciences, refrigerants, and tools.
•Do-it-yourselfers and owners. Make specialist gear and power offerings and attain greater effects, economically.
•Service body of workers, technicians, contractors, engineers, and facility managers. locate up to date info on codes, criteria, defense information, and methods.
•Anyone who wishes transparent, illustrated, step by step directions for effective, most economical, and present equipment in picking out, fitting, holding, troubleshooting, servicing, and repairing todays AC and refrigeration apparatus.
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1-26. If the gage does not have a recalibration screw, remove the ring and glass. Connect the gage you are testing and a gage of known accuracy to the same pressure source. Compare readings at midscale. If the gage under test is not reading the same as the test gage, remove the pointer and reset. If remote readings are necessary, then the vapor tension thermometer is best. It has a closed, filled Bourdon tube. A bulb is at one end for temperature sensing. Changes in the temperature at the bulb result in pressure changes in the fill medium.
It is rugged and easy to handle. This meter is useful when working around unknown power sources in refrigeration units. Fig. 1-20 Voltage and current recorder. (Amprobe) GAGES AND INSTRUMENTS Fig. 1-19 AC and DC voltage probe voltmeter. (Amprobe) Figure 1-20 shows a voltage and current recorder. It can be left hooked to the line for an extended period. Use of this instrument can be used to determine the exact cause of a problem, since voltage and current changes can affect the operation of air-conditioning and refrigeration units.
Refer to Fig. 1-37. • With the needle valve on the adaptor closed tightly, just barely open the tank valve, using a P-O-L tank key. Test for leaks. • Open the adapter needle valve about one-quarter turn. Light the gas above the reaction plate. Use a match or taper. Leak Testing the Setup Using a small brush, apply a thick solution of soap and water to test for leaks. Check for leaks at the regulator and any connection point. Check the hose to handle connection, hose to regulator connection, and regulator or adaptor connection.