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 06-06-2011, 09:22 AM   #1
Newbie
 
Join Date: Jun 2011
Posts: 2
Share |
Default

MST Damper Motor Problem


I have a dual zone damper-controlled system with a damper downstairs and one in the attic for the upstairs system. The system has been fine for 5 years I've lived here but within the last few weeks it was not getting any air to upstairs system. In checking out the upstairs damper (damper is free and easy to move), when the thermostat calls for cooling and sends air upstairs, the damper motor doesnt move. When I short terminals 4 and 5 (or move it slightly with my hand) it will open but rather than stop, the motor rotates 360 degrees back to closed position. Any ideas? One other curiosity, terminal #2 (24V Hot) is jumped to terminal #5 (switch common), seems odd to me but it has been ok for years. I replaced the MST motor and board with new unit over the weekend, nothing changed. Thanks in advance for any assistance.


Last edited by Mountie0329; 06-06-2011 at 09:25 AM. Reason: Forgot important detail
Mountie0329 is offline   Reply With Quote
Reply


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
Zone Damper Questions rkelly_83543 HVAC 3 04-18-2010 03:52 PM
Zone damper sticking Dutch2 HVAC 5 02-28-2010 02:49 PM
Damper door on Furnace not opening all the way tro222 HVAC 11 02-08-2010 08:28 PM
Installing Flue Liner thru Damper MikeinBurien Building & Construction 0 10-16-2009 11:39 PM
Zone damper system danstar25 HVAC 10 12-24-2008 01:27 AM




Top of Page | View New Posts

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