Search: Posts Made By: DIY56
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11-18-10, 04:36 AM
Replies: 55
Views: 23,433
Posted By DIY56

I forgot to include this page which gives basic...

I forgot to include this page which gives basic info on F/L switches, also helpful ;)
Furnace Fan Limit Switch Control: a guide to the fan limit switch, settings, manual fan override, temperature...
11-18-10, 04:24 AM
Replies: 55
Views: 23,433
Posted By DIY56

Re; Ideal fan settings

Handy To Be, looks like you have a Honeywell F/L controller, here's a nifty explanation about how it works and the best settings to use; Honeywell L4064B Combination Fan and Limit Control: How to...
11-17-10, 10:15 AM
Replies: 55
Views: 23,433
Posted By DIY56

Talking F/ L Controller

ecman51 & Handy To Be,
A lot of what I'm reading on this thread had me confused so I pulled out my fan/limit (blower) controller (equivalent to Camstat-Henry F560) and tested with my Voltage-Ohm...
11-16-10, 09:53 AM
Replies: 55
Views: 23,433
Posted By DIY56

Quick question; by unhooking the red wires to the...

Quick question; by unhooking the red wires to the fan limit switch aren't you opening the circuit? Many furnaces will keep the blower running if this circuit is open as a safety measure (open= a high...
11-16-10, 08:46 AM
Replies: 15
Views: 39,296
Posted By DIY56

Same problem with my Tempstar DC90

It sounds like many of these induced-draft combustion furnaces operate similarly; 3 safety limit switches wired in series to protect us from a malfunction.

I also had the flame roll-out...
11-16-10, 07:32 AM
Replies: 3
Views: 10,708
Posted By DIY56

Tempstar DC90; Fan Continuously blows, no heat

Found the problem, found 2 limit switches in the upper (burner/heat exchanger) cabinet wired in series; the flame roll-out sensor and the fan limit sensor. I found the problem to be with my flame...
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