I sold and installed a Fujitsu 36RCLX cassette type air conditioner in the center of the ceiling in a freshly remodeled board room. Indoor unit AUU36RCLX and outside unit AOU36RLX. Background: single story building, no windows, brick/cinder block construction, only north wall exposed to outside air, all other walls against controlled environments on other side. The board room was just remodeled, and it's dimensions are 38'X28' with a 9.5' ceiling. Condensing unit set on the roof, approx. 10 feet above cassette unit. Ran new 10 gauge copper circuit per NEC code and installed disconnect on roof. Pulled vacuum before releasing freon to 500 microns. The construction contractor installed a brand new drop ceiling before operation after initial install and insulated above drop ceiling with R-16.
Here's the skinny.
A/C worked fine 3 days after initial installation (as per factory included installation instructions), then went down on a 1b error code (high pressure sw). The ambiant temp was peaking around 90 F. One of my techs spent forever on the phone with Fujitsu tech support and they sent out a new control board we received 3 days later and then system ran for approx 24 hours before again going off again on a 1b error code. We blew out the indoor coil, cleaned the new condensor and powered back up. Stayed on line for around 4 hours, went off on compressor failure. Customer getting irritated, so I contacted sales rep and Fujitsu tech support, tryed more solutions (changed other parts and screwed around for about 8 more days changing parts as per their instruction) with same result, compressor would not start. Told sales rep to get out here with new unit and help find a fast viable solution. He came out, we spent an additional 3 hours on phone with Fujitsu tech support until he got extremely upset with them and he made the call to demo out existing outdoor unit and replace as per the installation instructions. We then installed a brand new outdoor unit. Installed new wiring harness to indoor unit and new line set as per their recommendation. Unit started and cooled board room to 72 degrees.....held temp for 3 days, then went down on 1b (high pressure sw)! We again called support, cleaned units again, powered down, started back up and would not stay on line for more than four hours at a time without going off on high pressure. Sales rep gave us the green light to change out the indoor unit, so we installed brand new indoor unit. System cooled like a champ for about 5 days, or until temps started hitting 100 degrees and then started into same 1b error code. Sales rep came back out today, we spent around 3 hours on phone with tech support today and they are trying to tell me that the operation parameters of the unit only go to 115 degrees F!!! The ambient temp on the roof this afternoon was 106 F and surface temp of the black tar roof was 122 F. They are now sending out a fan motor and a new control board again. The air going in the bottom side of the condensing coil was 112 F and the air going into top side was 107 F. I decided to paint the black tar roof around the condensing unit with snow white roof sealant and have knocked 7 degrees off surface temp directly in front of and around condensing unit.
Has ANYONE had the same issue or does anyone have any suggestions regarding my situation. This has been a ridiculous situation and although we've sold and installed around 10 Fujitsu high wall systems without a single problem, I'm pretty sure that I'm done with this company. I purchased it from my Carrier sales rep and he has been wonderful in helping with the situation and feel he has went above and beyond, but he tryed to get a Fujitsu factory rep out to help remedy the problem and they weren't concerned with trying to help us. Please give me your insight. Thanks