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Which of the following standards is the industry authority for basic HVAC system requirements?
When reviewing the building automation system, a patient room VAV box indicates the heating water reheat valve is open. Which of the following results can be expected from this scenario?
When reviewing the building automation system, an air handling unit is observed operating in economizer mode while the outside air temperature is 89 degrees F. Which of the following conditions is most likely the root cause?
Which of the following procedures should be initially followed if an air handling unit is not operating?
An air-locked hot water finned-tube would likely cause what issue?
Which of the following control variables for quiet operation is steam-supply pipe sizing based on?
1 lb of water pressure equals how many feet?
Refer to the following scenario:
A condensing boiler with at least a 95% efficiency rating is sized for 100% design load and is not meeting the documented efficiency when operating at full capacity. The boiler is capable of meeting the heating water supply temperature setpoint of 165ºF with 155ºF entering water temperature. Which of the following statements is the primary cause of decreased efficiency?