View Full Version : Constant evap coil temperature control?
05-02-2005, 04:40 PM
Does anyone make a residental system that will maintain a set evaporator coil temperature by varying the air flow with an ECM?
05-02-2005, 05:03 PM
No but you could install an EPR valve.
Some of the two stage equipment has 4 different fan configurations with the ECM to accomidate lower stages and dehumidify modes, this is a means to maintain a desired range of coil temperatures.
05-02-2005, 06:05 PM
With the VS technology that is already in many systems it should not be that difficult to use blower controls along with a TXV to keep the coil temperature within a set range.
05-02-2005, 07:08 PM
Thanks for the comment, Robin.
Wouldn't that be a more efficient setup than a head pressure control? I'm thinking, of course, of Colorado, where the temperature often drops from the 90's to the 60's before a house is cooled off in the late evening. This often results in uncomfortably cold drafts and sometimes frozen coils.
It might also be an efficient way to handle homes with large swings in humidity.
05-02-2005, 07:17 PM
What you really need is a head pressure control unit that will slow down and speed up the condenser fan speed.
05-02-2005, 07:49 PM
I would think that a combination of controls for indoor blower, outdoor fan along with TXV metering would be best for such a varying load.
05-02-2005, 08:15 PM
Or an economizer.
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