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14 Cards in this Set
- Front
- Back
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which thermostatic trap is not adversely affected by superheated system
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bimetallic
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which term is a measure of resistance to the movement of air that is being forced through a hvac systems?
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static pressure
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list the valves and terminals in the order they occur falls under which step of preparing water-balance test reports?
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Fill out the flow or pressure drop water balance report
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list the coil id and room number in sequence falls under which step of preparing water balance test reports?
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fill out the temp water balance report
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the shape of the flame can be altered from short and bushy to long and narrow in a hortizontal rotary burner by
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interchangeable cups and nozzles
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when performing an ignition spark response on a uv flame detector what is the max meter response when ignition starts?
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1/4 microamp
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what control is a pressure sensitive swietch used to prove a sufficient amount of combustilbe air from the drafts fans?
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airflow control
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the proper way to purge the furnace of a boiler up to line pressure?
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1/4 the max airflow
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what is the min size pipe connection for a guage glass on an expansion tank?
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1/2 in
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what do you use if a centrifugal pump supplies too much water pressure or too many gpm?
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a bypass valve
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what is one type of controlled device used in a pneumatic system?
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actuator
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which flow meter measures volume rates by inserting its free moiving elements into the water flow?
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mechanical
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what is used in a humidity control subsystem to keep the humidity in the ductwork from getting too high?
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high limit humidity controller
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the mixed air section for a variable air volume system is identical to the one on a signle zone system unless to
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ventilation load is constant
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