When water gets into a refrigeration system, chemical reactions inside the system often create:
A) Phosgene gas. B) Fluoride crystals. C) Acid. D) Combustible gas.
C
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For the purposes of personnel hoist platform design, a guard rail is defined as a(n) _____.
a. top rail about waist height b. intermediate rail about knee height c. combination of a solid, perforated, or expanded-mesh metal barrier and toe board d. combination of a top and intermediate rail with the lower barrier and toe board
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How is the tubing used in ground-source systems joined?
A) CPVC cement B) Threaded fittings C) Flare fittings D) Thermal fusion
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A common problem on the job site that contributes to delays is _____.