I was glad to find this forum. I hope someone can give some help/advice.
It's hard to know where to start but I will try to get to my most important issue.
A local HVAC contractor installed a new Bryant Heat Pump & Fan/Coil unit in my house a little over 2 years ago. I have had multiple issues with this unit, most of them related to installation, but I won't go into those right now. I just wanted to mention that so you could better understand my frustration. About a month ago I noticed one morning that the unit was not running and that the thermostat had no power. I discovered that the 5 amp fuse on the fan control board was blown. I replaced the fuse and got the unit running again. It ran for 2 weeks with no issues until the fuse blew again.
(Just so you know, I have worked with electrical controls
and industrial automation for almost 18 years and have done a lot of troubleshooting. While my unit was still under warranty I did not attempt to do any type of troubleshooting even though there were some controls related issues during the first few months. Also I do
not do anything related to refrigerant. That's not my area of
expertise.) Anyway, with the fuse blowing a second time I knew there
was some issue going on. I thought the fuse blowing might be related to a failed rectifier/relay that controls the auxiliary heat.
I disconnected the wires going to the relay coil and the fuse has not blown since. The reason I thought the relay had failed, possibly in the closed/on position was that my aux. heat units were cycling on and off even though the fan was not running. The elements would come on and then turn off when the high temp limit switches would open. What I then did was disconnect the power wire from the relay to the aux. units and reconnected the relay coil wires. Still no blown fuse again. One of the things that really has me puzzled is that one of the aux. heat units is wired to the normally closed contacts of the fan relay, so whenever the fan is not running power is going to this unit. It comes on and and cuts off when the limit switch opens. I checked the wiring diagram and this was the correct wiring. Why would the aux. heat need to come on when the unit is not running?
Anyway, I am attaching a couple of pictures to show what I think may have contributed to my problem. Even if this didn't cause the problem it still is a poor design. Seems there should be some type of barrier between the heat terminals and the foil on the insulation. Thanks for your help.