In regards To Carrier model 25HNA648A300 used with Carrier FV4BNF005 fan coil. Some things to keep in mind; Carrier seems very reluctent to supply their distribuitor & sales network with the correct technical info. wiring diagrams, and operating specs. so a functional operating system is in place on any given customers location. MINE INCLUDED! The technical programing and wiring configuration requires a high degree of expertise. It may well tax the average HVAC installer's abilities. Plus the abilities of the area's distribuitor to supply the correct parts to put together a funcitional operating system. One big problem seems as in my case no one wants to admit the system requires knowledge which is above their ability. I have been trying for two years with only moderate success. And have reached the stage where it may become necessary to hire a lawyer to get things moving my way. $x is a lot of money for a system that only performs up to 3/5 of what it should. Would any of us accept a car under the same conditions? Can anybody supply me with the correct wiring configuration so I can check out my system properly? 25HNA648A300 2 stage HP. FV4BNF005 Fan coil with 20kw resistance aux heat, 2 piece Bryant thermostat with external control box.
So far AC works perfect in the summer. But only 3 stages of heat will work in the winter. The 3rd stage adds 5kw of redistance when the temp gets down to 5deg F. Defrost works fine runs 15kw of res. heat. But Below zero down to -30deg F the Compressor never shuts down, and I never get any more than 5kw of additional res heat, Emergency heat will only run 5kw of res heat no HP compressor. Over all I believe there should be a total of 5 stages and 20kw of emergency available. Thanks for bending your ear. email direct please Richard