EXV forced closure?

[hobbit]

I recently noticed that my air handler / indoor coil has a pair
of dry-contact input terminals to force its EXV to CLOSED during
cooling mode.

When/why would you want to do this, and/or why would such a
function want to be able to be externally automated? I can't
imagine how it could be good for the rest of the system.

tnx

_H*

[Shophound]

What indicates that this is what the set of dry contacts are for? Dry contacts are often for alarm triggering purposes.

[ryan1088]

Hobbit it this on your Daikin system we have talked about before?

[hobbit]

Yup, the Daikin FTQ type air handler. Quoting from the
install manual description for option block terminals 9,10:
"Receives input: Forced closure of indoor unit Electronic
Expansion Valve during cooling operation. (dry contact)"

Seems like a strange thing to want an input for. Note: this
isn't the same as "forced off" that you'd use for safety
switches, condensate-pump overflows, etc.

_H*

[Elfshadow]

Sorries did not notice this was in the ask a pro section.