COMMUNITY FORUM

gregsubk

02:32PM | 08/27/00
Member Since: 08/26/00
3 lifetime posts
Bvhvac
I have a Lennox system. I think it is a G26? Whatever they replaced the bad pulse systems with. The AC unit is model H514-511-U-1P. Here's my problem. The system works great but keeps blowing the class 'k' fuses in the fuse box outside next to the unit. If I replace the 2 fuses it works great again. Sometimes this happens as often as everyday, then other times it can go a week or has even gone several weeks before they blow. I had a repairman come out to look at it and all he did was replace the fuses (for a very high price, too). These fuses are about $5 for the pair so it's getting costly and I can't seem to get a straight answer on the cause. Any ideas?

HOLLYWOOD

12:47AM | 08/29/00
Member Since: 02/19/00
206 lifetime posts
You may be, or the unit itself may be short cycling just after shutdown. the unit needs about 5 minutes for the pressures to equalize. If the unit comes on too soon, blown fuses are usually the end result. If you have a round Honeywell t-stat, gold in color, you system should have a time delay added to eleminate this problem. Also, the wire connections on the 220vac both inside and out should be tight,...good connection.
I think that you will find that the problem is that the unit is comming back on just after shutdown. It's hard to see and it's really not your fault.

Ask the service tech. if there is a time delay anywhere in the system, and if not, to add one.

[This message has been edited by HOLLYWOOD (edited August 29, 2000).]

rpxlpx

04:06AM | 08/29/00
Member Since: 03/13/00
1675 lifetime posts
Are the fuse holders/connections both tight and clean (no corrosion)?

gregsubk

04:15PM | 08/30/00
Member Since: 08/26/00
3 lifetime posts
Thanks for the advice!
I checked the fuse holder connections and they are clean. I'm checking into the delay. The thermostat is a Lennox with the heat and cool settings separate on one panel but I don't think it has any way to delay. Do the progammable ones let you add a delay time in?

rpxlpx

03:43AM | 08/31/00
Member Since: 03/13/00
1675 lifetime posts
Until you get the problem permanently resolved, you might want to check to see if BOTH fuses blow. Maybe you could save a few $$ by replacing only one at a time.

gregsubk

05:27PM | 08/31/00
Member Since: 08/26/00
3 lifetime posts
I did check. They both blow. Believe me that was one of the first things I hoped for.
The fuses say they are 'Dual Element, Time Delay, Current Limiting'. I have a second A/C system for another part of the house that doesn't have these fuses. Are these fuses suppose to be the delay you are speaking of?

HOLLYWOOD

03:59AM | 09/02/00
Member Since: 02/19/00
206 lifetime posts
Duel element fuses are reccomended. All digital programable t-stats have a built in time delay. So you will be getting a better t-stat and adding a time delay at the same time.
Your fuses can be standard fuses but dont worry so much about that for now.
One way to see if your current stat has a time delay is cycle the unit, send someone out side to the condenser, shut unit down at t-stat and turn back on at once. the unit should not start for 3 to 6 or so minutes. That will tell you if there is a time delay on that t-stat.

[This message has been edited by HOLLYWOOD (edited September 02, 2000).]

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