Air Conditioning TOP Exam Guide Questions and CORRECT Answers
Cause of most freeze up problems in steam coils? 1) Coils handling 100% outside air OR 2) An incorrect blend of outside air and return air. Coil tube length where danger of freeze-up is minimal? 1.1 meters or less. Tube length is negligible as long as the steam trap is properly chosen and the coil is properly piped to ensure proper drainage of the condensate. Freezing occurs in coils with long tube lengths at what temperatures? why? Around -2, -1 degrees C because this situation leads the control valve into a "hunting" manner and results in sluggish flow of the condensate. What type of valve could potentially solve this issue? Two-position control valve, versus the modulating type. Where is the pre-heat coil usually located in a system? In the outside air duct entry and before the intersection with the return air
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