Furnace and Hot Water Heater - http://www.hvacmechanic.com/ Forums


Original message

ptrapper65

24.47.60.197

"Furnace and Hot Water Heater" , posted Sat 6 Sep 09:44user profileedit/delete messagepost reply


Hi,

A few years ago, I had a separate hot water heater installed. The guy who did it left the hot water coil in my furnace. The problem I'm having and I've noticed this in the summer is the furnace cycles on and off. My heat thermostats are off, so it's just heating the hot water coil. This is a waste of fuel since the separate hot water heater is heating the water. Is there a simple wire disconnect that I can undo from the furnace to disconnect the unnecessary on/off cycle?

The controller is Honeywell.

Thanks in advance for any help.

 


Replies:

theduke03

68.9.234.3

"Re(1):Furnace and Hot Water Heater" , posted Sat 6 Sep 13:57user profileedit/delete messagepost reply


You can simply shut off the boiler at the end of each heating season. I reccommend having boiler cleaned at that time every year.

"My dad was the most feared furnace fighter in Northern Indiana."

 

 

ptrapper65

24.47.60.197

"Re(2):Furnace and Hot Water Heater" , posted Sat 6 Sep 18:13user profileedit/delete messagepost reply


but even if i did that, I would think the boiler would still cycle unneeded in the winter because of the water coils call for heat. It may not be as much as in the summer, but it's a little, maybe???

I'm correct 99.9% of the time.

 

 

midwayice

67.85.135.23

"Re(3):Furnace and Hot Water Heater" , posted Sun 7 Sep 21:34:user profileedit/delete messagepost reply


Your boiler may have an aquastat with a high and a low setting which is designed to maintain a high temp. in the boiler in case you need hot water. You can turn the "low setting" all the way down and your boiler should cycle less.
You should still turn your boiler off when you don't need heat.

midwayice

[this message was edited by midwayice on Sun 7 Sep 21:36]

 

 

ptrapper65

24.47.60.197

"Re(4):Furnace and Hot Water Heater" , posted Mon 8 Sep 17:30user profileedit/delete messagepost reply


Thank you. That's a great idea. Now, why would I have to keep the high where it's at and just lower the low dial? Does the high have anything to do with the call for heat? I would like to disconnect the water coil part all together.

I'm correct 99.9% of the time.