HVAC “leaking”
我们的承包商最近安装了运营商的最新巴西速度热泵和男孩汗水！承包商真的很好。他们昨天移动了锅，以捕获Middlebit上的凝结（带有制造商标签的设备），但歧管也出现了处理程序的汗水。它直接滴入我们的绝缘材料中。
I don’t know whether it’s related, but the unit has been throwing “blower motor fault” off and on since they commissioned it. We got twenty such faults throughout the last couple hours of this morning. Is that related?
Our contractor has tried to assert that our attic is the problem. Whether that is true or not, he agreed to install a unit in that attic, so I need him to fix it. It’s not clear what the fix has gotta be, though. Any ideas?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part
Search and download construction details
答复
无条件阁楼中的空调必须被代码隔离。“捕捉”凝结是不可接受的；必须用适当的绝缘材料隔热，以防止冷凝水
In my opinion duck work and equipment in the attic is a laze and dumb decision that saddles the homeowner with at least 25% higher operating costs. Sorry if I hurt anyone’s feeling.
所有修复程序都是关于您可以恢复多少不必要的损失。
Option 1. Install the code required R8 insulation wrap around the ducts. Before insulating the ducts consider sealing the leaks in the ducts. Very leaky uninsulated ducts could double your operating costs.
Option 2. Is to remove the current insulation and apply new spray foam insulation to the bottom of the roof sealing the attic from outdoors then add vents from the ducts into the attic and condition the attic air to the same temp as the house. This option makes the surface area of the conditioned space 25% larger and limits your R value because spray foam is very expensive per R per square foot compared to fluffy stuff on the attic floor.
选项2比选项1不好，这仍然是您要选择的糟糕选项。选项2比选项1贵2贵，如果您在房子里呆了足够长的时间，则可以为自己付出代价。
Walta
The ducts & air handler need to be insulated to a code-min R8 with an air-impermeable exterior facer/skin. The laws of physics are self-enforcing- when the temperature of a surface is below the dew point of the proximate air condensation will form on that surface.
在绝缘之前，首先需要在每个接缝和接缝处密封管道。（可以用箔式HVAC胶带将空气处理程序的接缝密封。）
>“我不知道它是否相关，但是自从他们委托以来，该部门一直在抛弃“鼓风机的电动机故障”。我们在今天早上的最后几个小时中遇到了二十个这样的缺点”
Find out from the manufacturer what conditions cause the blower motor fault. The system isn't really "commissioned" until that gets resolved. It's possible that the air flow is too low (often due to ducts being too small, or a crummy restrictive filter) the supply ducts will be colder than normal, creating even more condensation. Something like that could be related to the blower motor fault condition.
Mapping the static pressure drops across the system with a dual-port manometer is something the HVAC contractor should be able to do (if not, you can with a $100- $150 box-store manometer and some investment in your time). If it turns out the duct design is OK but the filter is too restrictive with a big pressure drop, cutting in an oversized 4-6" deep pleated filter would allow more flow. This sort of problem is all stuff that the contractor should have figured out up front.
通常，高SEER设备需要粘性管（或较低的CFM空气处理器）来处理现有的管道系统，但可能能够与较小，更右尺寸的热泵一起使用。美国绝大多数的交流和热泵系统都严重过大，通常超过2倍的矿石更大，用于设计冷却或加热负荷。1.2倍超大的热泵，用于1％的设计条件冷却负荷和0.9-1.2倍的加热负荷可能具有足够低的CFM，可以使用较小的1或2速老式Seer 10类型的较小的预先存在的管道系统。
感谢大家。几个承包商表演Man J计算，并提出了2.5或3吨。我们安装了2吨，因为a）一位承包商说，这就是适合我们现有的管道的原因，b）我们已经做了很多事情来密封信封，并且在他们的模型中没有考虑到这一点。
该承包商用新的R8管道代替了所有可访问的管道。我知道某个地方有泄漏，因为早晨阁楼比应该的凉爽。如果他们应该通过代码隔离处理程序，那应该是一个保修问题。在与它们接触基础之前，我们将看到鼓风机电动机故障的含义。
Benjamin, I have a Carrier heat pump and air handler installed last year with a similar issue. It's not the Greenspeed but the model below that with 5 different speeds. When the weather is hot and humid (I'm in Delaware, on the coast), I often get errors 44 and 40 related to the blower motor. The unit shuts down. Sometimes it corrects itself and restarts.
有时需要一天左右。的英斯达ller replaced everything but the air handler box last August. We had no issues until late June of this year. Now the same error codes are appearing again.
我的空气处理程序安装在密封的阁楼中。阁楼用开放的细胞喷雾泡沫密封。我没有密封的阁楼上的供应或返回。阁楼中的湿度比房屋高的湿度高，这是开放式细胞泡沫密封的阁楼的已知问题。我的管道隔热至R-8。但是空气处理程序本身并非绝缘。当湿度高时，我在空气处理程序上得到了很多凝结。我的假设是，凝结正在进入电子设备并引起故障代码。为了测试这一点，我将使用除湿机降低阁楼的湿度，并查看故障代码是否停止。
I should note that I have the same air handler installed in a downstairs utility closet and I have had no problems with that unit. I've also never seen condensation on that unit.