PDA

View Full Version : DOM Timer


comeaudale
11-14-2011, 09:23 AM
I am trying to delay my indoor fan start by a few seconds to prevent cold blow; application is residential add on heat pump.

I have wired a TD69 in series between the G terminal from an Aube TH146NU base module and the fan relay RC485.

I have tried two different timers and can't get any time delay; the fan relay energizes immediately on G call. I have checked all the obvious.

Have you ever seen a DOM or DOB relay not time for some "mysterious" reason?

Stumped by the elemetary!

Dale
Chris_Worthington
11-15-2011, 06:27 PM
Moved to AOP
jpsmith1cm
11-15-2011, 06:35 PM
hvac69,

I had to delete your post because this thread is in the AOP Forum.

You should look at becoming a Pro Member here.
catmanacman
11-15-2011, 06:46 PM
maybe its the y call turning on the fan
jpsmith1cm
11-15-2011, 06:50 PM
I know how I would approach this, but we cannot give out DIY advice on this site.

A good tech should be able to sort it out very easily.
beenthere
11-15-2011, 06:53 PM
Delaying the indoor fan in heat mode is not a good idea.
comeaudale
11-15-2011, 09:45 PM
Thanks for your post, I am not a DIY'er....not in this case anyway; I am a licensed HVACR mechanic.
comeaudale
11-15-2011, 09:46 PM
I agree however when we deal with the elderly a fan that blows cold for 20 seconds is something that becomes all consuming.
beenthere
11-15-2011, 09:49 PM
What about an early death for the compressor.
comeaudale
11-15-2011, 09:55 PM
What about an early death for the compressor.
not going to happen in 20 seconds...anyway I dont need an opinion on system design I just asked a simple question on DOM timers

Have you ever seen them influenced by the load they control?
beenthere
11-15-2011, 10:00 PM
not going to happen in 20 seconds...anyway I dont need an opinion on system design I just asked a simple question on DOM timers

Have you ever seen them influenced by the load they control?

20 seconds 500 times a heating season adds up.

Yes i have, but that isn't what is causing the blower to still run, like it is suppose to.
comeaudale
11-15-2011, 10:03 PM
20 seconds 500 times a heating season adds up.

Yes i have, but that isn't what is causing the blower to still run, like it is suppose to.
thanks for your help