Problem with Concord heat pump / air handler


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Old 07-12-12, 05:41 PM
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Problem with Concord heat pump / air handler

Hello,
Long first post coming, sorry.
I have a Concord heat pump / air handler controlled by a Honeywell th8320u1008 thermostat that is giving me grief. The system was installed last October and has never really worked. I ran on emergency heat all winter and have just been ignoring it until our recent hot spell.
I did have an HVAC contractor out this morning to take a look but he thought I just had a low charge and didn't have time to find the real problem.
It seems the reversing valve isn't operating and now whenever the unit is turned on it only runs for a very short time and then switches off (within two minutes I would say).
I have the thermostat programmed with function 170 at #7, function 190 I have tried with both heat and cooling controlling the valve and have tried auto and manual for function 300. No luck.
Is there another function that I might have programmed incorrectly?
All of the wiring from the thermostat to the air handler - compressor unit seems to be in order.
Please help, I am melting.
 
  #2  
Old 07-12-12, 07:10 PM
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please list out your low voltage wiring

T-stat = AHU = HP
R = R = R ....etc.
 
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Old 07-12-12, 07:29 PM
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Y2, L, E, S1, S2 = NOT USED


T- stat AHU HP
Aux - W W/B W (W1 jack)
RC = Jumpered to R
R - R- R- R
O/B O -O- O
Y-none- Y
G -G-none
C B- B- B

Sorry for the formatting, I hope it makes sense.
 
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Old 07-12-12, 07:31 PM
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you only have 2 Y?

Y should be connected to stat, ahu, and HP...
 
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Old 07-12-12, 07:33 PM
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Double checked, comes from stat, goes to HP.
 
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Old 07-12-12, 07:36 PM
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Is there a Y terminal in the AHU? Not that that is what your problem is, just strange.

Ok, with a helper, Remove R and O at the stat. one person go outside and the other inside at the stat. Have the person at the stat touch R to O, does the person outside here a click when this action takes place?
 
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Old 07-12-12, 07:38 PM
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I wired it according to page 16 here:

http://www.ducanehvac.com/pdfs/48658f007.pdf
 
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Old 07-12-12, 07:42 PM
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I have no helper at the moment unfortunately, and when she gets home she is going to be crabby!
 
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Old 07-12-12, 07:45 PM
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ok, try this. shut power off to AHU.

@ stat, remove and wire nut together R,G,Y,O

turn back on power to AHU

this should bring on cooling.
 
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Old 07-12-12, 08:12 PM
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Same symptoms.
HP comes on and the line going to the house gets hot immediately.
I shut it down.
 
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Old 07-12-12, 09:35 PM
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I finally got some helpers and there was no audible click when R and O are touched together.
 
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Old 07-12-12, 09:51 PM
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Also, to eliminate the possibility of an open in the O wire running from the stat to the HP, I jumped straight from the hot to the O at the HP and no click. There is 25 volts at the red there.
Bad ground on O maybe or a solenoid problem???
 
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Old 07-13-12, 04:25 AM
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Yes. Could be not connected. Could be bad coil.
 
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Old 07-13-12, 05:47 PM
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Well thanks for your help.
After all of that I looked in the unit and the reversing valve was completely unplugged.
What a nightmare.
I wonder how common this is as my HVAC buddy told me he has seen it a few times too.
 
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Old 07-13-12, 06:33 PM
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well, it was a no cost fix so good for you!
 
 

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