s******s
发帖数: 13035 | 1 看中一房子，1.4k sqft，2000年的，空调和furnice都是原配。
请问寿命大概多长？是不是空调可能不行了？修起来或者换个新的大概多少数量级？
另外，是不是普通的保险管修？（不好意思，从来没买过房）。 |
|
i*******u
发帖数: 1065 | 2 我当初搬了家后，也是点不着furnice，按着说明怎么都点不着，只好打电话给furnice
公司，从下午一直等到晚上8点，technician才来，原来这个furnice上没有自动点火，
必须用火柴点。ft!还好没收我钱。 |
|
i*******u
发帖数: 1065 | 3 你最好找furnice公司来做个检查，我家的furnice曾经也热的很慢，furnice公司查了
发现secondary heater exchange坏了不工作，所以只有一半工作，另一半不工作还漏
煤气，很危险的。 |
|
s*********t
发帖数: 16647 | 4 ☆─────────────────────────────────────☆
AdamsMyIdol (F3) 于 (Tue Dec 6 15:19:18 2011, 美东) 提到:
发信人: AdamsMyIdol (F3), 信区: Living
标 题: 请教关于gas furnace 的问题
发信站: BBS 未名空间站 (Tue Dec 6 15:18:59 2011, 美东)
房子用的是gas furnace（搬进来才几个月）。最近天冷了，发现要用很长时间才能把
家里加热起来。
我把白天家里没人的时候的温度设成55度，然后从5pm 开始，设成70度。等到7pm回家
的时候，房间里才63度左右的样子（室外温度是32度左右）。
感觉热得太慢了。以前住condo的时候从50度加热到70度很快就好了，不过是用电的
furnace。我去gas furnace边观察了一下，发现它大概是这样工作的：燃烧加热一会儿
（感觉同时也在送暖风），燃烧停止，只能听见送暖风的声音。这样送一会暖风后，再
燃烧加热。房子的保暖应该可以，也没觉得哪里漏风。
就是觉得这个加热过程太慢，想问... 阅读全帖 |
|
|
|
|
|
s********n
发帖数: 4535 | 9 我觉得homewarranty.firstam.com 不错，给我换了空调，其间还修了烤箱，比较老实 |
|
|
B***t
发帖数: 115 | 11 最近utility bill大涨，大概测了一下，我把furnace turn on, 用电从1KW 跳到 3.
4KW, turn it off, go back to 1KW. 看来即便是gas furnace也消耗很多电？还是我
的furnace有问题？ |
|
|
|
t***s
发帖数: 4666 | 14 1-1.5kW is possible. 2.4kW is kind of high. |
|
j***b
发帖数: 5901 | 15 如果是瞬间2.4kw应该没啥，不过应该几秒钟内回落到正常值。
另外，你使用什么测得kw？ |
|
B***t
发帖数: 115 | 16 我看得PG&E的smart meter. 基本维持在2.4kw. 我试了一天白天不开furnace, 一天用
18kwh. 如果开的话，基本是42kwh.
这个furnace是不是用电太多了？ |
|
T*U
发帖数: 22634 | 17 一天要24度电，单位用电2.4kw，电扇一天运转10小时，正常啊。
8000sqft的ranch, 风扇工作压力还是很大的。 |
|
B***t
发帖数: 115 | 18 哪有8000sqft.
问题就是这个2.4kw, 是不是furnace的问题。
2500 sqft house的fan要2.4kw? |
|
t***s
发帖数: 4666 | 19 what's the furnace model? you sure it's not a heat pump? |
|
C*******d
发帖数: 15836 | 20 你的furnace里面可能不但有Blower，还有Emergency Electric Heater。如果你家室外
温度很低的话，那么这个Emergency Electric Heater很可能也被启动。 |
|
|
t***s
发帖数: 4666 | 22 为什么gas furnace要emergency electric heater? |
|
C*******d
发帖数: 15836 | 23 对不起，没看清原文。如果是Gas加热的话，那么一般来讲应该没有应急加热机制。不
过楼长的用电很难用风扇解释，因为一般Furnace的风扇用电是几百到1千瓦。如果他的
Furnace有这种电辅助加热的机制的话，那么它的启动可能代表着gas不能加热了，也可
能外面太冷gas加热太慢。 |
|
C*******d
发帖数: 15836 | 24 发贴时忘了这一点了，我还以为是Heat Pump呢。你问的对，其实貌似gas furnace一般
没有emergency electric heater。但这样有解释不了楼长Furnace的超高用电量，所以
肯定有什么比较大的用电的东西和Furnace的开关连着。Emergency electric heater应
该是一个可能性。楼长needs to find it out. |
|
B***t
发帖数: 115 | 25 Thanks veryone! I will find out the model tonight. |
|
|
|
B***t
发帖数: 115 | 28 老实说，我不知道，没有找到manual,也没有上attic. Ladder 被借了还没回来。
Heater turn on后， 我的gas用量也急剧上升，所以我觉得是gas furnace.
我自己又大概折腾了一下。我的房子有两个zone. 如果我开楼上的，用电量很小，大概
0.5KW. 如果我开楼下的，就2.4KW. HVAC系统有两个outdoor unit (fan and
compressor?). 如果开楼上的heater, both outdoor unit 没有启动, 但是如果开楼下
的heater, one outdoor unit 就启动了。我把outdoor unit plug out的话，electric
power马上就降到0.5KW左右了。heater还是工作的，出风口能感觉到热气，温度也上
升了。
看来是这个outdoor unit很费电。summer 开AC的时候，outdoor unit是开的，这是主
要的空调部分。为什么开heater，它也启动了？还是说应该只起到风扇的作用去排除废
气？ |
|
t***s
发帖数: 4666 | 29 you've got a heat pump, with gas backup. or your t-stat wiring is
really screwed.
try to feel the air from the the outdoor unit. is it colde or warm?
electric |
|
C*******d
发帖数: 15836 | 30 外面的Unit的风扇和房子的废弃没任何关系。它的启动代表着HVAC也启动了。所以你的
房子是双加热系统的，一般这种比较少见。两个能源一起加热快，但不一定最节能。
electric |
|
t***s
发帖数: 4666 | 31 he's got a gas furnace + cooling a/c for up stairs. and a heat pump with
gas backup for downstairs. unless they really screwed up the wiring.
turning cooling a/c on while heating. |
|
C*******d
发帖数: 15836 | 32 Wow, that would be horrible if they mixed the wires. To find it out, OP can
check the air outlet temperatures with and without outside HVAC power
plugged. |
|
d****2
发帖数: 6250 | 33
man, this is really f*up system. |
|
t***s
发帖数: 4666 | 34 i'm not saying that's definitely the case. just a remote possibility,
if he doesn't even know he's got a heat pump. |
|
B***t
发帖数: 115 | 35 I could not find out the furnace model, but my AC is carrier 38CKS, so it is AC, not a heat pump.
This summer, some technician tuned up my AC system. He did something to my outdoor unit. Can he mess up
with the wire? |
|
B***t
发帖数: 115 | 36 I googled. carrier 38CKS is not hybrid split system. But I am not sure. I
just start to google and learn... |
|
B***t
发帖数: 115 | 37 I need to double check. I have two outdoor unit with very different size,
downstair unit is much larger than
upstair unit, but I got only one documentation of carrier 38cks... |
|
t***s
发帖数: 4666 | 38 check and let us know. btw, where are you? what is the typical outdoor
temp during the winter? |
|
j***b
发帖数: 5901 | 39 2 out door units should be two separate AC/Heat pumps, since the fan and compressor, condenser should be all in one metal cage. So I guess one is AC and the other is heat pump. |
|
B***t
发帖数: 115 | 40 San Francisco Bay Area. This winter is cold. About 30F to 40F at night, 45
to 55 on the day. |
|
C*******d
发帖数: 15836 | 41 Since both inside and outside works, it must be coupled in some way. One
easy thing you can do, as I mentioned earlier, is to check the first floor
air outlet temperatures with and without outside HVAC power plugged in. If
the outlet temperature is significantly higher when outside HVAC is plugged
in, that means that both of them works together to head your house.
Otherwise, there is something wrong. |
|
B***t
发帖数: 115 | 42 Sure. Will try after I get home tonight.
plugged |
|
t***s
发帖数: 4666 | 43 then you likely have a heat pump. it makes sense to have a
heat pump in the bay area. |
|
t***s
发帖数: 4666 | 44 or you can just feel the wind generated by the outdoor unit while it's on.
if it's cold, it's heating the house. if it's warm, it's cooling the house. |
|
B***t
发帖数: 115 | 45 why? head pump can be more efficient if temperature is not that low? |
|
t***s
发帖数: 4666 | 46 the higher the outside temp, the higher the efficiency. for example,
it's probably doesn't make sense to have an air-sourced heat pump
in wisconsin or minnesota. |
|
B***t
发帖数: 115 | 47 I can not really tell whether it is blowing cold or hot air from the outside
unit since yesterday night and this morning it is not very cold.
I read the label of the outside units. Both are labeled as model 38BRC (I
have the document of 38CKS). They are AC, not heat pump.
I called some contractor to come check. Will update after I get the result. |
|
|
L**Q
发帖数: 834 | 49 现在有两房，请大家帮忙看看，选那个好，
1）1993年，single family house（2200sqft), 有yard, 地下室装修了(partial
basement),学区不错，离工作的地方19mile, ~300k (including furniture, but need
to change furnice and air condition soon)
2) 2001年，single family house with $200 association fee(2100sqft), 没有yard
, full basement无装修， 学区一般， 离工作的地方~10mile, ~255K
比较犹豫，自己觉得第二个便宜又新， 但是没有自己的院子,LD喜欢有院子的， 现在
孩子还小 |
|
m*****3
发帖数: 13701 | 50 据版上的专家们说，维护好的话应该可以抵挡20/25年以上，你做inspection让人仔细
检查一下就心里有数了。换个新的肯定得三四千往上，房屋保险不管，你得买 home
warranty，俺自己没用过，不知道咋样。 |
|
