Air Filtering & Thermostat


Old 05-11-02, 07:17 AM
DC Larson
Visiting Guest
Posts: n/a
Air Filtering & Thermostat


New here. I would like to find a thermostat that would keep a the fan on of a central heating system for a while. A programmable one that you could set to have the fan run for 25 minutes off 5 on 25...etc, if possible. I wouldn't even mind letting it run all the time. My objective is to keep the air moving so it can be filtered! I have just a round old style thermostat on a nice new Lennox Central Heating System. Will go with air conditioning this summer maybe. If just having a fan on moving air, maybe we won't need one. Any ideas?
Sponsored Links
Old 05-11-02, 07:41 AM
Sharp Advice's Avatar
Admin Emeritus
Join Date: Feb 1998
Location: The Shake and Bake State USA
Posts: 10,440
Received 5 Votes on 4 Posts
Hello DC Larson and Welcome to the Heating and Cooling forum and our Do-It-Yourself Web Site.

The objective you would like to accomplish may be available right on the heating unit. There may be a "FAN ON" option selection position located on the fan relay switch.

Depending upon the heating units age & type, the type of fan relay switch installed on the unit, this manually selected option may be available. Check that switch on your heater.
Use CAUTION: The fan switch is houseline electrical voltage.

If this option is available, turning the fan switch to the ON position will keep the fan running continuously day & night.

Some heating units, again, depending upon the exact unit you have, may have a external fan switch located on the furnace somewhere. If this option is available, there will not be a need to locate the fan switch.

Digital thermostats have fan on only manually operated switches. Installing one of these types of thermostats will accomplish the same task. However, the furnace will have to be wired for it and those wires will have to be available at the thermostats existing location. If the wires are not already there, they will need to be added.

Several other resident heating and cooling professionals on this type of system, replying within this forum, could have additional helpful information, suggestions, advice. Check back on your question several times for additional replies.

If you need further assistance, use the REPLY button to add any and all additional information, etc. By doing so, the additional information you add will remain within this posting. Using this method also moves the topic back up to the top of the list automatically.

Forum Host & Moderator.
TCB4U2B2B Company Enterprises.
Fast, Fair, Friendly & Highly Efficient Service.....
Energy Conservation Consultants & Gas Appliance Diagnostics Technician.
Old 05-11-02, 07:45 AM
hvac4u's Avatar
Join Date: Aug 2001
Location: NW atlanta
Posts: 3,147
Received 0 Votes on 0 Posts
get a heat/cool tstat

your new system has a "G" terminal at the board inside the furnace. connect this terminal to the "G" terminal at tstat, and the fan on switch will keep the fan on. also there are "dip switches" more than likely that control fan on/off delay, check the owners manual. if you only have 2 wires going up the wall to the tstat, you wil have to pull a new tstat wire, when cooling is added, you will need another conductor, i recommend pulling at least 5 conductor tstat wire, as it is alway good to have extras in case of a short
Old 05-12-02, 05:28 AM
DC Larson
Visiting Guest
Posts: n/a
Thanks Guys...appreciate the info!

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
Display Modes
Ask a Question
Question Title:
Your question will be posted in: