In HVAC Series fan powered VAV boxes Select all that apply.
A. Must always have the fan on when occupied B. Use the fan only for heating mode C. must be sized for the full cooling load D. sized only for the heating load
In HVAC series fan-powered VAV (Variable Air Volume) boxes, the following options apply:
A. Must always have the fan on when occupied - This is generally true for series fan-powered VAV boxes, as the fan helps to mix the air and maintain comfort levels.
B. Use the fan only for heating mode - This is not correct. Series fan-powered VAV boxes can operate in both heating and cooling modes, although they may be more commonly associated with heating.
C. Must be sized for the full cooling load - This is generally true. Series fan-powered VAV boxes should be sized to handle the full cooling load to ensure adequate cooling capacity when needed.
D. Sized only for the heating load - This is not correct. While they may be designed to provide supplemental heating, they should also be sized to accommodate the cooling load.
So, the correct selections are A and C.