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 08-18-2013, 11:02 AM   #1
MEASURE ONCE, CUT TWICE
 
123pugsy's Avatar
 
Join Date: Oct 2012
Location: MARKHAM, ON
Posts: 620
Rewards Points: 666
Default

Dehumidifier Mode on A/C System


I have a new two stage furnace and a new A/C system.
I was reading a thread about a guy that had the wrong thermostat installed on his furnace and it wouldn't run in "dehumidifier mode". Is this the correct way to say this?
The whole system is oversized at present as I will be doing a second story addition soon. I'd like to get a better thermostat and hopefully the system can run slower to draw out more humidity.

Is this correct?

The thermostat installed on my unit has only AC/Heat, fan ON/OFF.

My furnace is a Luxaire model TM9V080C16MP11.
I believe it's a two stage with DC motor.

123pugsy is online now   Reply With Quote
Old 08-18-2013, 12:22 PM   #2
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,929
Rewards Points: 3,528
Default

Dehumidifier Mode on A/C System


A thermostat like the Honeywell IAQ(YTH9421) can slow your blower down, and provide control of both stages of heat that your furnace has. Along with both stages of cooling if your A/C is 2 stage.

Is the A/C 2 stage. And what size is it.

__________________
When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
beenthere is offline   Reply With Quote
The Following User Says Thank You to beenthere For This Useful Post:
123pugsy (08-20-2013)
Old 08-18-2013, 06:26 PM   #3
MEASURE ONCE, CUT TWICE
 
123pugsy's Avatar
 
Join Date: Oct 2012
Location: MARKHAM, ON
Posts: 620
Rewards Points: 666
Default

Dehumidifier Mode on A/C System


Thanks.


House at present is 1144 sq feet with 8' high 2x4 walls bungalow.
Future house will be 2288 sq feet with 2x6 walls.

A/C is Luxaire, 3 tons, TCGF36S41S1.

All thermostat wiring diagrams refer to Single Stage. So, I guess I'm toast then?
Attached Files
File Type: pdf LUXAIRE TCGF36S41S1 AIR CONDITIONER 1.pdf (99.1 KB, 16 views)

Last edited by 123pugsy; 08-20-2013 at 05:35 AM.
123pugsy is online now   Reply With Quote
Old 08-18-2013, 08:39 PM   #4
AKA HVACTECHFW
 
Join Date: Nov 2010
Location: NE Indiana
Posts: 2,327
Rewards Points: 1,020
Blog Entries: 1
Default

Dehumidifier Mode on A/C System


The IAQ stat BT suggested will do what you want if wired properly. I would recommend the upgrade though to the new VP 8000 stat (TH8321R1001) and EIM (THM5421R1021). This setup would allow for wireless outdoor sensor and indoor sensors and internet gateway (for internet/smart phone access) all to be added as wanted/needed.
__________________
IT IS WHAT IT IS
hvactech126 is offline   Reply With Quote
Old 08-20-2013, 05:34 AM   #5
MEASURE ONCE, CUT TWICE
 
123pugsy's Avatar
 
Join Date: Oct 2012
Location: MARKHAM, ON
Posts: 620
Rewards Points: 666
Default

Dehumidifier Mode on A/C System


Quote:
Originally Posted by hvactech126 View Post
The IAQ stat BT suggested will do what you want if wired properly. I would recommend the upgrade though to the new VP 8000 stat (TH8321R1001) and EIM (THM5421R1021). This setup would allow for wireless outdoor sensor and indoor sensors and internet gateway (for internet/smart phone access) all to be added as wanted/needed.

Thanks hvactech.

I will do some research to see which way I will go with this.

So with the single stage AC, is there any chance of the coil icing up when the thermostat calls for Dehumidify/low speed fan?
123pugsy is online now   Reply With Quote
Old 08-20-2013, 06:42 AM   #6
AKA HVACTECHFW
 
Join Date: Nov 2010
Location: NE Indiana
Posts: 2,327
Rewards Points: 1,020
Blog Entries: 1
Default

Dehumidifier Mode on A/C System


Not typically, no... but that all depends upon your duct system. It typically doesn't slow it down enough to ice the coil but only enough to make the coil colder than normal and cause extra dehumidification.
__________________
IT IS WHAT IT IS
hvactech126 is offline   Reply With Quote
Old 08-20-2013, 12:47 PM   #7
MEASURE ONCE, CUT TWICE
 
123pugsy's Avatar
 
Join Date: Oct 2012
Location: MARKHAM, ON
Posts: 620
Rewards Points: 666
Default

Dehumidifier Mode on A/C System


Thanks.

How important is it to have the thermostat with the outdoor sensors?
Do they come into play when the thermostat is calling for Dehumid?

Oh, and the scariest thing is; can the wife get on her iPhone and start changing the settings?
123pugsy is online now   Reply With Quote
Old 08-20-2013, 06:05 PM   #8
AKA HVACTECHFW
 
Join Date: Nov 2010
Location: NE Indiana
Posts: 2,327
Rewards Points: 1,020
Blog Entries: 1
Default

Dehumidifier Mode on A/C System


Dehumidification with ac does not use outdoor temp in consideration with controlling humidity.

Dehumidification set point can be changed using a smartphone depending upon which control you choose if it has WiFi access.
__________________
IT IS WHAT IT IS
hvactech126 is offline   Reply With Quote
Old 08-20-2013, 08:13 PM   #9
MEASURE ONCE, CUT TWICE
 
123pugsy's Avatar
 
Join Date: Oct 2012
Location: MARKHAM, ON
Posts: 620
Rewards Points: 666
Default

Dehumidifier Mode on A/C System


Quote:
Originally Posted by hvactech126 View Post
Dehumidification with ac does not use outdoor temp in consideration with controlling humidity.

Dehumidification set point can be changed using a smartphone depending upon which control you choose if it has WiFi access.

Thanks.

For me, I can't see needing the WiFi option so I may go with the IAQ mentioned earlier.

123pugsy is online now   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
Need Help Buying a Sediment and Water Softener System. vpr80 Plumbing 10 02-23-2012 11:26 AM
heat pump freezing problem av-geek HVAC 8 02-02-2012 08:16 PM
I Need a New Boiler. What do i need to know New Boiler Co Plumbing 0 10-23-2010 07:03 PM
Which heatings system should I go with? keano016 HVAC 5 12-01-2009 03:53 PM
Size A/C system properly 70stang HVAC 1 03-26-2006 08:22 PM




Top of Page | View New Posts

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