# Refrigeration and Air Conditioning 4 (Equipment Cooling) by United States Army Combined Arms Support Command

By United States Army Combined Arms Support Command

By United States Army Combined Arms Support Command

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Additional info for Refrigeration and Air Conditioning 4 (Equipment Cooling)

Sample text

Figure 40 illustrates the method of solution charging. (1) Start the water jet on the purge unit and open the purge valve on the absorber. (2) Continue purging until a vacuum reading of 25 inches of mercury is obtained on the manometer. Close the valves and shut off the jet when the vacuum is satisfactory. (3) Connect the hose to the solution charging valve and place the other end of the hose into the drum of solution. Do not let the hose touch the bottom of the drum since this would draw up dirt that had settled there.

8, Par. 14) 38. What is the maximum allowable vacuum loss during a vacuum leak test? (Sec. 8, Par. 28) 33. How is the conical strainer cleaned? Par. 16) 39. Which refrigerant is added to the system to perform a halide leak test? (Sec. 8, Par. 29) (Sec. 8, 34. How is the purge connection on the absorber cleaned? (Sec. 8, Par. 20) 40. List at least three possible causes of lithium bromide solidification at startup. (Sec. 8, table 11) 35. (Agree)(Disagree) The diaphragm is a vacuum type valve should be replaced yearly.

Open the valve in the line from the absorber to the manometer and determine the pressure in the machine. Figure 32 illustrates a manometer reading. Take the temperature of the machine room and locate the corresponding pressure on the chart in figure 33. 1 inch of mercury higher than the pressure located on the curve, then there is air in the machine. This should be noted on the daily log sheet. If the condition recurs on the next two or three startups, the machine should be shut down as soon as possible and tested for leaks.