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Hi everyone!

Can somobedy explain me please how should be AHU heating coil leaving air temepratures correctly set? Especially for system 5-7 there is packaged VAV with reheat and I wonder what temeperatures should be used for AHU heating coil and zone heating coil (reheat coil). I would say that reheat coil should be set with supply-air-to-room-air temperature difference of 20°F because of design airflow rates, so if room heating setpoint is for instance 72°F then reheat coil is set at 92°F. But my question is what about AHU heating coil? Should it be set the same as reheat coil? Or quite opposite = at 52°F and it would be something like preheat coil? Is it prescribed somewhere in App.G?

Thanks for any advice in advance!

Martin

Hi everyone!

Can somobedy explain me please how should be AHU heating coil leaving air temepratures correctly set? Especially for system 5-7 there is packaged VAV with reheat and I wonder what temeperatures should be used for AHU heating coil and zone heating coil (reheat coil). I would say that reheat coil should be set with supply-air-to-room-air temperature difference of 20°F because of design airflow rates, so if room heating setpoint is for instance 72°F then reheat coil is set at 92°F. But my question is what about AHU heating coil? Should it be set the same as reheat coil? Or quite opposite = at 52°F and it would be something like preheat coil? Is it prescribed somewhere in App.G?

Thanks for any advice in advance!

Martin

Hi everyone!

Can somobedy explain me please how should be AHU heating coil leaving air temepratures correctly set? Especially for system 5-7 there is packaged VAV with reheat and I wonder what temeperatures should be used for AHU heating coil and zone heating coil (reheat coil). I would say that reheat coil should be set with supply-air-to-room-air temperature difference of 20°F because of design airflow rates, so if room heating setpoint is for instance 72°F then reheat coil is set at 92°F. But my question is what about AHU heating coil? Should it be set the same as reheat coil? Or quite opposite = at 52°F and it would be something like preheat coil? Is it prescribed somewhere in App.G?

Thanks for any advice in advance!

Martin