Air Conditioning and Humidity Control — Comments from Readers

This was fast – already have had a few suggestions and responses. Thank you to the responders.

One thing I did not go into was “controls” other than the economizer and this is what the responders all made suggestions about.

What could happen if a single stage thermostat was used on on 2-stage unit? Chances are, even though the unit WAS properly sized but now, because it only runs at full capacity with the single stage stat, there are times it is oversized causing it to short cycle and not properly dehumidify.

Or, being a bank, (they do keep them pretty cold), is it short cycling due to low loads at times. They have it set for a certain people load and now there is only 1 or 2 or no customers in the bank.  Maybe they need hot gas bypass or a RAWAL Valve (see post on HGBP).

So many things can cause a problem only because someone didn’t properly install a system or look at the complete application.



About yorkcentraltechtalk

I have been in the HVAC industry most of my life. I worked 25 years for contractors on anything from residential to large commercial boilers and power burners. For the past 23+ years I had been employed by York International UPG Division ( a division of Johnson Controls) as a Technical support/Service Manager but I am now retired. One of my goals has always been to "educate" dealers and contractors. The reason for starting this blog was to share some knowledge, thoughts, ideas, etc with anyone who takes the time to read it. The contents of this blog are my own opinions, thoughts, experiences and should not be construed as those of Johnson Controls York UPG in any way. I hope you find this a help. I always welcome comments and suggestions for postings and will do my best to address any thoughts, questions, or topics you may want to hear about. Thanks for taking the time to read my postings! Mike Bishop
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