My new Carrier Infinity system was installed last week at my home in Northern Virginia. I have mixed feelings about the job that the installers did. They did very neat work and the job looks professional. For the work with the refrigerant, they did a very good job as far as I can tell: I chatted with the techs and was told that they braze with nitrogen, used damp rags to cover the components, etc. But I've found a few things I want correct and would appreciate any other comments.
The model numbers are:
Furnace: 58MVP060-14 (94% AFUE condensing furnace)
I have read all the installation instructions for every component and have identified the following concerns:
1) The exhaust vent is not 12” above the intake as Carrier’s instructions require, and does not seem to follow the requirements for offset of less than 12”. Also, it may need to be located higher. It’s about 22” off the ground, and we get snow that high about every 10 years. It shouldn’t be a problem as long as I clear it during the snow, but the next owners may not do this or I could be away in a blizzard.
2) The TXV is mounted incorrectly. The instructions say it should be vertical, but it is horizontal.
3) The chimney flue liner for the water heater was not mortared where the liner enters the masonry flue. I was told it was unnecessary because it was sealed at the top, but I think it should be sealed for both safety and energy efficiency reasons.
4) Condensate pump safety switch was not placed in line with 24 VAC supply from thermostat to furnace. (Is this even possible with the unconventional Infinity wiring? Should it go on the D wire, which the instructions say is the 24VAC (hot) conductor?)
1) Small gap in caulking where the condensate lines leave the coil case.
2) Cable clamp not tightened where the furnace 14/2 cable enters the electric panel.
3) Romex used instead of armored cable. (I'd prefer AC, but am not going to quibble on this.)
4) Caps to cover unused air intakes and exhaust ports on furnace not screwed in with sheet metal screw per Carrier instructions
5) A metal patch on the ducts was not sealed with tape.
6) Electric knockout to outdoor unit not sealed properly.
A clip that holds the furnace front panel is missing, but it should be installed soon.
1) Carrier’s instructions say that the A/C condensate drain must have a trap prior to connection to furnace drain. I presume this isn’t required when they both drain separately into a condensate pump. Also, the condensate pump drains into the laundry tub. Is it acceptable for me to install a standpipe similar to a washing machine drain for the condensate? Or to tie it into the washing machine standpipe next to the tub? I don’t like it going into the tub in case I put the plug in to soak something or I have something in there that I don’t want furnace condensate dripping onto.
2) Although the quote specified an encased coil (CD5AXA036), the installers built their own case because there wasn’t sufficient room between the furnace and the existing ducts to install the coil case and make an adequate transition. (I was away and don’t know whether they pulled the coil from the case or replaced it with one that comes uncased.) Is this anything I should be concerned about? Durability, efficiency?
3) I looked at the service mode on the thermostat and noticed that although the thermostat stated that the A/C had operated in both high and low stages about 10 times each, the hours counter read zero for the low stage while the high stage read about 10. (This was over a weekend that seems perfect for low stage operation—very humid but only about 80-85 outside.) I’ve done some reading and understand that this is a known bug, but shouldn’t it have been fixed by now? All of my equipment was built in the last two months judging by the serial numbers.
4) It sounds like fluid is flowing through the filter/dryer when the A/C is running. I know fluid is running, but I don't remember ever hearing one of these make noise before.
[Edited by kcb203 on 06-06-2005 at 03:31 PM]