Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 01-14-2010, 12:51 PM   #1
Newbie
 
Join Date: Jan 2010
Location: Brandon, Fl
Posts: 5
Share |
Default

Heat Pump Control Wiring Questions


I've got a Comfortmaker heat pump system from 1986. This unusually cold Florida winter has exposed some problems with it. I have noticed over the years that it has blown cold air in the house while defrosting but it's never really been an issue. Now with this sub freezing weather it's going into defrost while running and cools the house. After the cycle it goes back to heat but now has to overcome that extra degree or two it's cooled the house and we enter a never ending cycle of a cold house. After doing some research online I have found that it's been repaired and rewired by some people that perhaps don't know what they're doing. I have installed a Rite Temp programmable that is wired correctly.
For one, the compressor fan has been replaced and is wired directly to the compressor relay.
I understand that when the defrost timer puts out a signal the compressor fan should shut down and the air handler should shut off, or turn the heat strips on.
There are only four wires to the compressor. Common/AC, Compressor, and Change Over. There are two unused wires in the compressor which are labeled X, and W1. I'm guessing that the W1 should be connected to the aux heat and would be the signal from the defrost timer. What is the X? I cannot find any reference for it online.
Would it be safe to add a relay to turn off the air handler when the defrost timer activates? I'm also considering changing the timer to 90 from 60 minutes.

IBuiltPools is offline   Reply With Quote
Old 01-14-2010, 01:29 PM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,523
Default

Heat Pump Control Wiring Questions


No. Don't shut the air handler off. It will take longer to defrost. And could freeze up the indoor coil. The heat pump needs the heat of the house to defrost the outdoor coil.

Reconnect the outdoor fan motor wires to the defrost board. And then check that the defrost board actually shuts the fan off. And that it actually runs the fan.

X should be a trouble indicator light. Not sure on that unit though.

But, W1 should be wired to bring on your strip heaters if you have any.

beenthere is offline   Reply With Quote
Old 01-14-2010, 01:38 PM   #3
Newbie
 
Join Date: Jan 2010
Location: Brandon, Fl
Posts: 5
Default

Heat Pump Control Wiring Questions


Okay. I'm looking into the air handler right now. The relay for the strips is getting power (when I send it) but not closing. I'm looking online for a replacement and it is described as part number 15sh2 SWITCH ELECRIC HEAT SEQUENCER made by Carrier. What does the sequencer part mean? Is this not a simple 2 pole relay?
IBuiltPools is offline   Reply With Quote
Old 01-14-2010, 01:45 PM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 24,523
Default

Heat Pump Control Wiring Questions


A sequencer is a timed closing device. May take 1 or 2 minutes the first time.
beenthere is offline   Reply With Quote
Reply

Tags
heat pump thermostat


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Installing natural gas furnace in place of heat pump, please help KlamathMog HVAC 17 10-20-2009 01:55 PM
Sump Pump Questions henlij Plumbing 19 08-12-2009 07:50 PM
Heat Pump vs Aux Electric Heat batolson HVAC 16 01-17-2009 10:28 AM
Trane Heat Pump tstat replacement with Honeywell prog - wiring question sep23 HVAC 2 10-20-2006 09:10 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.