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EXV forced closure?
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*
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What indicates that this is what the set of dry contacts are for? Dry contacts are often for alarm triggering purposes.
- Electricity makes refrigeration happen.
- Refrigeration makes the HVAC psychrometric process happen.
- HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.
A building is NOT beautiful unless it is also comfortable.
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Hobbit it this on your Daikin system we have talked about before?
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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*
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Sorries did not notice this was in the ask a pro section.
Last edited by Elfshadow; 09-10-2012 at 02:42 PM.
Reason: was in wrong section.
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