Miller CMF-80 gas furnance.


  #1  
Old 01-22-11, 07:52 AM
L
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
Miller CMF-80 gas furnance.

I just bought 2000 Miller CMF-80 gas furnace for my shop.The furnace starts,inducer fan runs and the burner comes on,but as soon as the blower kicks on it runs for 10 to 15 seconds then shuts down.It continues to cycle this way.Any ideas? Thanks in advance.
 
  #2  
Old 01-22-11, 03:14 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
Is the burner or blower shutting down?
 
  #3  
Old 01-22-11, 08:43 PM
L
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
The blower is shutting down. I had the furnace converted from a LP to natural gas. (Replaced gas valve and burner orafice. Tested pressures)
 
  #4  
Old 01-23-11, 01:54 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
The blower is controled by the temperature in the furnace. If the room temperature is low, what you are experiencing would be normal.
 
  #5  
Old 01-23-11, 05:23 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 12,682
Received 41 Upvotes on 39 Posts
Gas Valve

Why was the gas valve replaced? The original equipment valve is easily convertable between LP & Natural.
 
  #6  
Old 01-23-11, 08:38 PM
L
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
I had a local heating and cooling contractor do the conversion. I'm checking to see if there was anything I could do to fix the problem.
 
  #7  
Old 01-23-11, 08:44 PM
L
Member
Thread Starter
Join Date: Jan 2011
Location: USA
Posts: 4
Upvotes: 0
Received 0 Upvotes on 0 Posts
The room temperture is low. I don't use the shop all the time so the furnace gets turn on when needed. It take a long time to get the room to 50 degrees (3 to 4 hours.) The room is 4500 cubic feet.
 
  #8  
Old 01-23-11, 11:23 PM
SeattlePioneer's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Jul 2007
Location: Seattle, Wa
Posts: 4,469
Upvotes: 0
Received 1 Upvote on 1 Post
Since you have natural gas, you can clock the meter to determine the BTU input to the furnace.


You want to turn other equipment (like the water heater) to the pilot position so the main burner wont turn on.


Turn the thermostat up to 80 or so so that the main burner will turn on.

Measure the number of seconds it take for the 2' test dial on the gas meter to rotate 360 degrees, and post the result here.
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: