花花, 為何沒有24 V 電壓？

為何沒有24 V 電壓？...

ok, base on my very limited understanding..

1. check contactor if 24v.

1.1 if yes, bad contactor.
1.2 if no, go to control board.

2. control board, white=W=heat, yellow=Y=cool, brown=C=common, red=R=24v.

2.1 use voltage meter, check C+R, if 24v.
2.2 if no, goto 4, transformer.
2.3 if yes, goto 3.

3. if 24v on C+R, connect Y+R, condenser should kick on.

3.1 if condenser doesn't kick on, possible bad thermostat wire or bad thermostat. goto 5.

4. transformer.

4.1 check 110v input, if no input, bad wire.
4.2 check 24v output, if no output, bad transformer.

5. thermostat, white=W=heat, yellow=Y=cool, brown=C=common, red=R=24v, green=G=fan.
5.1 connect Y+R, if condenser on, bad thermostat.
5.2 if condenser doesn't kick on, bad thermostat wire.

所有跟帖： 

• 我最近的一次經驗 -little-landlord- ♂ (163 bytes) () 08/02/2012 postreply 18:49:05

• Yellow line? ... water overflow protection? -wooddiy- ♂ (0 bytes) () 08/02/2012 postreply 20:37:59

• 班長全能啊。應該置頂，非常有價值的內容，保存了。 -little-landlord- ♂ (0 bytes) () 08/02/2012 postreply 18:50:50

• lihai! -tianfangye- ♂ (0 bytes) () 08/02/2012 postreply 19:39:51

• 對#1有疑問 -monkeyboy- ♂ (153 bytes) () 08/02/2012 postreply 21:53:38

• because -比花花還花- ♂ (157 bytes) () 08/02/2012 postreply 23:32:25

• 這我知道，但班長說，如果有24v，就是壞的，為什麽？ -monkeyboy- ♂ (173 bytes) () 08/03/2012 postreply 12:11:53

• ok... -比花花還花- ♂ (369 bytes) () 08/03/2012 postreply 13:33:50

• really great. I did some research. yes. -比花花還花- ♂ (57 bytes) () 08/02/2012 postreply 23:31:09

• 沒做過有什麽關係，我的AC Contractor修空調時，我都會在邊上看，也會問些問題 -monkeyboy- ♂ (0 bytes) () 08/03/2012 postreply 12:14:22