Help with verifying Heat pump wiring

Reply

  #1  
Old 04-29-13, 08:02 AM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
Help with verifying Heat pump wiring

My home has separate units for downstairs and upstairs. We hardly ever use the upstairs unit, but had a few day of alternating hot and cold and noticed the upstairs unit was freezing. Had a service call and needed a recharge (probably the only time in the 15 years I've had it) However, when I switched to heat I noticed it was blowing cold air.

As I went to check the Reverse Valve coil, I noticed the wiring looked odd, no red connected, orange jumpered to yellow on control board then sent yellow to tstat. blue to common, and nothing else. So I went inside to check tstat connections to air handler and it looked more like a jumbled mess and one of the worse installs I've ever seen.

I have an outdoor Goodman GSH130241AA Heat Pump with an indoor vertical Rheem RHQA 1010B air handler connected to a Honeywell t874r 1459 tstat (all wiring at the tstat end is wired to corresponding color codes) Wiring uses 7 wire for all connections.

What is the proper wiring from the outdoor unit to the indoor unit and to the thermostat?

I want to verify he install and do some troubleshooting before doing a service call, as it usually takes a week before anyone comes out and if it looks like a reversing coil replacement, then I'll hold off and replace the unit.

Thank you
 
Sponsored Links
  #2  
Old 04-30-13, 11:26 AM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I see the heat pump.



The Honeywell T874 series thermostats can be matched to a variety of subbases.
https://customer.honeywell.com/resou...0s/69-0392.pdf


What is the Q674?-???? number on the thermostat subbase?

What terminals are on the stat subbase ? (also list unused terminals)
What is the color wire = terminal combination used at your stat?
What is the color wire = terminal combination used at your air handler?
 

Last edited by Houston204; 04-30-13 at 12:09 PM.
  #3  
Old 05-02-13, 06:52 AM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
Thank you for the quick reply. I was out of town and just got back.

The subbase is q674L 1504 8614
White - W2
Yellow - Y
Blue - B
Orange - O
Brown(tan) - X
Green - G
Red - R

Thank you again,

Mike
 
  #4  
Old 05-02-13, 03:56 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
List the thermostat terminals that are not in use.
 
  #5  
Old 05-02-13, 04:07 PM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
From T-stat

Green is going to air handler
yellow is going to heat pump yellow and orange
Red is going to air handler
blue is going to air handler (however, blue from heat pump is going to air handler as well and not connected to blue on tstat)
white to air handler

Not used
Orange
Brown (tan)
Black

I also have a photo of the air handlers wiring diagram if needed.

Thank you

Mike
 

Last edited by mhoward223; 05-02-13 at 05:23 PM.
  #6  
Old 05-02-13, 04:48 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
List any unused thermostat terminals...
Do you have an H?
Do you have a T?
Do you have an L?
Do you have any terminals on the subbase that do not have a wire connected to them?
 
  #7  
Old 05-02-13, 04:56 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I can't make out that pic.
Can you post a larger picture ?
The heat pump blue is common.
What color is common on the air handler?
Does the air handler have screw terminals or short pieces of wire to connect the stat wire to (pigtails)?
 
  #8  
Old 05-02-13, 05:17 PM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
L and E are the only two on the thermostat without a wire, all others, (W2, Y,G,R,B,O,X have a wire)

Air handle has wires

 
  #9  
Old 05-02-13, 06:34 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts





Conclusion...


Your diagram shows G (fan) and W (heat strip 2) as 2 black wires. If the fan has worked fine for all this time, the black wire connected to stat G is fan.

Heat pump W2 connects to the air handler purple wire which is heat strip 1.
Thermostat W2 connects to heat strip 2.
 
  #10  
Old 05-02-13, 06:50 PM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
Thank you so much,

I knew something was completely messed up when I pulled the heat pump and saw that red and white were not connected to anything and yellow and orange on the heat pump were wire nut together.
 
  #11  
Old 05-02-13, 07:15 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I would add a 5 amp, blade type automotive fuse to protect the transformer. Someone may have gutted your wiring because of a short.

Radioshack has a good fuse holder for ~ $3 that is good for up to 30 amps. Put a 5 amp fuse in it.

 
  #12  
Old 05-03-13, 08:31 AM
M
Member
Thread Starter
Join Date: Apr 2013
Posts: 10
Received 0 Votes on 0 Posts
lol went back through wiring and realized the contact was bent on tstat.

Thank you for everything, it was gonna be next Friday before I could get a service call.

Using your original diagram, this was how it was wired.



Thank you for all your help.

Mike
 

Last edited by mhoward223; 05-03-13 at 10:51 AM.
  #13  
Old 05-03-13, 05:17 PM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
I'm glad that you resolved the problem.
Your setup would probably intimidate many techs without that diagram.
I recommend printing it and leaving a copy at the air handler.
 
  #14  
Old 05-05-13, 09:04 AM
Houston204's Avatar
Forum Topic Moderator
Join Date: Oct 2009
Location: Texas
Posts: 7,426
Received 17 Votes on 14 Posts
The Honeywell RTH6580WF, the Honeywell RTH8580WH are some wifi stats that will work with your system. The RTH9580WF is a very impressive thermostat that will also support your system.




It is not recommended to "setback" the temperature setpoint in the heat mode with heat pumps since this will engage the heat strips when it tries to recover from the set back setting.

You can setback the thermostat in cooling mode.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: