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 10-15-2012, 03:54 PM   #16
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 0
Share |
Default

Furnace Condensation problem


Did you get the purge times .

It's not what FIELD wants it's what your furnace requires. If it is truly designed for power venting then a draft regulator AND the size of the vent are useless AND maybe detrimental to that application.

BTW when you said it was power vented what exactly do you mean..is the power from the oil burner supply fan or is there a secondary blower or induced draft fan in the FIELD equipment...personally I can't see the purpose of the application..if the furnace incorporates a positive pressure combustion process then all you require is the 4 inch corrugated staimless vent

Also, isn't the existing 4 inch internal for flue gasses and outside diameter 6 inch to allow for combustion air intake OR do I have the sizes wrong?

techpappy is offline   Reply With Quote
Old 10-15-2012, 04:19 PM   #17
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,080
Rewards Points: 54
Default

Furnace Condensation problem


Quote:
Originally Posted by wml52 View Post
Thanks for the info.

BTW, the draft regulator is required as per Field Controls installation and set up manual. One of the things I'm wondering is why they ran 6" pipe when it terminates to 4" at the power vent, why not just run 4" all the way? I would think a smaller pipe 4" would get hotter and stay warmer longer then a 6" pipe? Just wondering...

Bill
Because its suppose to be 6" until the power ventor.

When i the last time it ws cleaned and set up with a combustion analyzer.
beenthere is offline   Reply With Quote
Old 10-15-2012, 04:23 PM   #18
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,080
Rewards Points: 54
Default

Furnace Condensation problem


Quote:
Originally Posted by techpappy View Post
Did you get the purge times .

It's not what FIELD wants it's what your furnace requires. If it is truly designed for power venting then a draft regulator AND the size of the vent are useless AND maybe detrimental to that application.

BTW when you said it was power vented what exactly do you mean..is the power from the oil burner supply fan or is there a secondary blower or induced draft fan in the FIELD equipment...personally I can't see the purpose of the application..if the furnace incorporates a positive pressure combustion process then all you require is the 4 inch corrugated staimless vent

Also, isn't the existing 4 inch internal for flue gasses and outside diameter 6 inch to allow for combustion air intake OR do I have the sizes wrong?
It has a fan in the hood of that power ventor. Its a somewhat common set up around here.
beenthere is offline   Reply With Quote
Old 10-15-2012, 04:32 PM   #19
Newbie
 
Join Date: Oct 2012
Posts: 15
Rewards Points: 0
Default

Furnace Condensation problem


The Field Controls unit is basically a squirrel fan that draws exhaust gases from the burner, the furnace is not a positive pressure combustion chamber. The power vent is used in situations where a normal chimney cannot be used or is not practical, in my case it's a log home with no chimney so the power vent was utilized.

If you look at the photo of the power vent the 6" flue pipe goes into the 4" center of the power vent via a 6' to 4" reducer and the 4" intake duct that exits from the bottom of the power vent is the make up air.
wml52 is offline   Reply With Quote
Old 10-15-2012, 04:36 PM   #20
Newbie
 
Join Date: Oct 2012
Posts: 15
Rewards Points: 0
Default

Furnace Condensation problem


The system was looked at by several HVAC contractors that never once looked at the power vent itself. I did however pull the unit and check it over the summer, it was in good condition with very little soot.
wml52 is offline   Reply With Quote
Old 10-15-2012, 04:38 PM   #21
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 0
Default

Furnace Condensation problem


Just looked up the manufacturer's data for your furnace. It is not a positive pressure combustion process as I thought . It is a negative pressure over draft type combustion chamber/natural draft, which would normally vent to a full sized chimney with just a draft control to maintain negative draft over the fire and keep chimney venting properly.

However, what you have is an approved modification to allow direct venting straight outside without a chimney therefore the large discharge flue must be required to meet venting requirements of the furnace.

I think you could mitigate the condensation by closing off the existing combustion air intake (stuff it with non combustible insulation) and provide a separate source for outside combustion air. Check with Field but I don't think that would affect the venting process. It will reduce the cold air surrounding the outlet flue.
techpappy is offline   Reply With Quote
Old 10-16-2012, 03:14 AM   #22
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 25,080
Rewards Points: 54
Default

Furnace Condensation problem


Burner has probably been down fired, and the flue is too cold because of that, and probably too much combustion air.
beenthere is offline   Reply With Quote
Old 10-16-2012, 08:28 AM   #23
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 0
Default

Furnace Condensation problem


it's been checked several times by different technicians..doesn't anybody know what they are doing OR..it's just too darn cold in the basement..don't know why it's not being heated but I would heat it. Can't stand cold floors.

techpappy 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
Heil Furnace Burner Problem timothyr HVAC 79 02-12-2014 07:01 PM
Help with furnace blower problem Spydey HVAC 6 12-15-2010 08:18 PM
Payne PG9YAB high efficiency 95% furnace water draining problem jchen64 HVAC 9 12-06-2010 06:42 PM
Old Silver-Line furnace problem avro1 HVAC 9 03-18-2010 12:01 AM
Strange Problem with My Furnace chenjijc HVAC 14 11-04-2009 09:05 PM




Top of Page | View New Posts

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