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Economizer high limit doesn't work

I don't normally have secondary limit on differential enthalpy economizers, but this model actually has two - an enthalpy value and a dewpoint. Setup seems simple, but it's not working.... EnergyPlus setup is:

image description

Results are:

image description

Insights, please!

ps, For the series of values shown, outdoor temp is ~29c, RH ~60%. Zone temp & RH are shown in the image (~20C, = 60%RH)

Economizer high limit doesn't work

I don't normally have secondary limit on differential enthalpy economizers, but this model actually has two - an enthalpy value and a dewpoint. Setup seems simple, but it's not working.... EnergyPlus setup is:

image description

Results are:

image description

Insights, please!

ps, For the series of values shown, outdoor temp is ~29c, RH ~60%. Zone temp & RH are shown in the image (~20C, = 60%RH)