Disable tankless coil
#1
05-23-07, 04:19 PM
Disable tankless coil
Hi, I just bought a house which has a hot water boiler with 2 zones, 1 circulator and a tankless coil for DHW. I'm considering replacing the tankless coil for a tank based system. I understand I'll have to add another zone controller + circulator, however, how do I go about disabling the tankless coil. The main reason I want to disable the thing is that my furnace goes on about once every 45 minutes, which is just ridiculous for the summer.
#3
05-24-07, 08:26 PM
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If your furnace is in a damp basement, having it run during the summer is a good idea. It will keep it dry and help it last longer and be easier to service.
But like Grady said, what do you have for a aquastat?
But like Grady said, what do you have for a aquastat?
#4
05-25-07, 08:40 PM
Aquastat
The furnace has a Honeywell L8124A,C or L8151A - not sure which - anyhow - Honeywell triple aquastat. We've got it currently set to 125 low, 15 differential, 150 high. It was set much higher before, something like 170 low, 10 differential, 190 high before.
#5
05-25-07, 09:08 PM
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Boiler make & model
Some boilers just do not work well, especially in a damp basement, in a cold start application. Pin style boilers in general do not. Can you supply the make & model of the boiler? This may help us guide you in the right direction.
#6
05-26-07, 06:05 AM
Make and model
The burner is a Beckett Model "AFG" and the boiler a Vaillant F75-W-45 PP. Hopefully this is the right model number, I can't find any more numbers related to the boiler itself. The furnace is located in the garage which is under the house, and the basement is finished and doesn't seem to be damp. I'm also noticing that the baseboards in the basement seem to be hot, although the thermostat in the basement seems to be working fine, if I turn it up the heat clicks on and down it clicks off...
#7
05-26-07, 09:47 AM
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Boiler/ Baseboard
That boiler should be ok in a cold start application. If you have zone valves, you could have one stuck. If circulators, the flow check could be not seating fully.
#8
05-27-07, 06:41 AM
Thanks Grady
Thanks Grady!
One more question, what would I have to do to make it a cold start? Would I have to change the aquastat for a single high temp rather than the high, low, diff, or is it just a matter of fixing the wiring?
One more question, what would I have to do to make it a cold start? Would I have to change the aquastat for a single high temp rather than the high, low, diff, or is it just a matter of fixing the wiring?
#9
05-27-07, 07:50 AM
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Aquastat
I know there is a way to convert an 8124 to cold start & was trying to find it on Honeywell's site without any luck. Maybe one of the other guys will see this & remember how to do it.
You could replace the 8124 with an 8148.
You could replace the 8124 with an 8148.
#10
05-28-07, 02:23 PM
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What does "cold start" refer to? Does it imply that there is no tankless coil for domestic hot water?
Thanks!! -Tony
Thanks!! -Tony
