For this system they may be dependant on each other yet they do say they have two distinct functions.Originally posted by john dalton
Sit down friend, although I totally agree with you regarding your option that when worst case scenarios are present involving wind that is blowing across the condensing coil, condensing coil flooding is the preferred, best, most logical, most reliable form of condensing coil reduction. Having said that, and not knowing the weather patterns in this area of Florida, I would use the flooded condensing coil method of reduction if the wind was a factor.
Now, with that said, Serverroomcooling,: I know you have never seen your condensing unit on the roof, but I wonder if the wind has the ability to flow through the condensing coil unobstructed or is there structural members of the building that would hinder or prevent that?
If the wind can blow through the condensing coil, unobtrusively then I would recommend the flooded condensing coil methods to control your capacity reduction in this section, if on the other hand, the wind was not a problem, then I would recommend the JC P66 condensing fan controller for the reduction of capacity control for this section.
Is this a satisfactory statement Thehumid!......and what about the installation of HGB on the evaporator so Serverroomcooling could lower his setpoint to 65 degrees F ?
John J. Dalton
One can be installed without other independantly depending on what the application calls for. If I install the hot gas bypass head pressure(low ambient) control in a system like serverroom where the load is constant it would work without an evaporator pressure regulator. and vice versa in an area where low ambient was of no concern the epr cold be installed with no low ambientHBG.
They also say fan cycling controls should NOT be used to control head pressure......
Still unable to convert you I ask you this:
1)When a fan cycles off does the compressor pull more amperage as the head pressure rises? If it does ...is this beneficial to the compressor motor and windings?
2)Does this happen with the Hgb low ambient valve?
3)Does a fan motor pull more amps continously running all day or shutting on and off 100 times a day?
4)Which reduces motor life more stoping and starting or having the motor continuously running?
5)Besides the obvious wind drawback do you believe the sudden high side pressure changes caused by fan cycling have no adverse effects on the TXV? You do not think it causes the TXV to start seeking as well which while it is seeking takes away from the system efficiency?
Ok ........this getting to be like chess again.
[Edited by thehumid1 on 01-22-2005 at 07:23 PM]