Operation - York XA Series Installation Manual

5168274-BIM-I-1121
b. 24 VAC from EX-FAN to energize exhaust fan on
Economizer Expansion module

Operation

Operation details include:
a. Compares economizer output to the Economizer Damper
Position For Exhaust Fan On and OFF.
b. Energizes exhaust fan when economizer output is above
Economizer Damper Position For Exhaust Fan On.
c. De-energizes exhaust fan when economizer output is
below the Economizer Damper Position for Exhaust Fan
OFF
24 Johnson Controls Ducted Systems