RAD_CTL Return Air Damper Control - Operation Manual - EM1.8U - ELC.E14 - EM1.8D - EM1.8R

Description

RAD_CTL has the same control logic with MAD_CTL Mixed Air Damper Control. It controls the output of an analog return air damper, which is mainly linked to the output of an outside air damper, i.e., the opening percentage of the return air damper is equal to the result of subtracting the outside air damper from 100 %.

The set also has a manual override function: The output is "Return Air Damper Manual Setpoint" if "Return Air Damper Mode Select" is "0 - MAN (manual)", and the automatic logic value of the application if "Return Air Damper Mode Select" is "1 - AUTO".

Function

"Return Air Damper Control" is "Return Air Damper Manual Setpoint" when "Return Air Damper Mode Select" is "0" (0-MAN/1-AUTO).

When "Return Air Damper Mode Select" is "1" (0-MAN/1-AUTO)", "Return Air Damper Control" is equal to the larger value of "Return Air Damper Minimum Setpoint" and the result of subtracting the outside air damper from 100 %.

NOTE: The basic logic is the same as mixed air damper control.

Internal logic

Input

Output

Example