Domestic hot water and whole house heating with one boiler?????
#1
Need some expert help please.
I am installing a new boiler (NYThermal Legacy L150) and I have a couple of questions.
I understand how to pipe the installation for just heating use, but, I'll be using the DHW heating coil on this unit for domestic hot water.
During the heating season I can see how the boiler would supply hot water to the coil by keeping the boiler LO temp. at 160 F. minimum, but, when summer comes along, if the heating water is kept at this temp wouldn't the whole house be hot also? There are no zone controls on my system at all, just a central thermostat.
Is there supposed to be a electric valve that stops circulation to the one pipe heating system and another valve opens for the bypass circuit causing the boiler water to recirculate around the DHW coil?
I just can't see how the boiler controller can make a distinction between a call for house heat and a call for DHW heat without separate valving for each segment.
I'm a little cloudy on this and would really appreciate some expert help.
Vic
I understand how to pipe the installation for just heating use, but, I'll be using the DHW heating coil on this unit for domestic hot water.
During the heating season I can see how the boiler would supply hot water to the coil by keeping the boiler LO temp. at 160 F. minimum, but, when summer comes along, if the heating water is kept at this temp wouldn't the whole house be hot also? There are no zone controls on my system at all, just a central thermostat.
Is there supposed to be a electric valve that stops circulation to the one pipe heating system and another valve opens for the bypass circuit causing the boiler water to recirculate around the DHW coil?
I just can't see how the boiler controller can make a distinction between a call for house heat and a call for DHW heat without separate valving for each segment.
I'm a little cloudy on this and would really appreciate some expert help.
Vic
Last edited by Victorious1_1; 12-07-04 at 06:11 AM. Reason: Changing title for better response
#2
Greetings from NH. I am sure that if your thermostat in the house is turned down (off) during the summer season, then your circulator pump which is on the boiler side is not going to send the heat up into the house because it is not being called for. Thus the only water to heat up will be inside the boiler itself which in return will heat the DHW in your coil. I hope this was of some help. Happy Holidays!
#3
Thanks Bob, now it all seems to make sense to me. I guess that all I have to do now is be certain that the Sentry 2100 controller on this boiler knows that I have installed a DHW coil or does it automatically keep the boiler water temp at a minimum 160' if I set the LO limit to 160?
Maybe I'm confusing this somewhat; if there is no call from the thermostat for heat, the recirc. pump will not start, but, the boiler will keep itself between the preset high and low limits and that is what heats the DHW.
If this is the case, can I install a timer on this boiler so that it is not constantly running to make DHW at times that it's not needed?
What type/make of timer could I purchase to accomplish this?
Happy holidays, Vic
Maybe I'm confusing this somewhat; if there is no call from the thermostat for heat, the recirc. pump will not start, but, the boiler will keep itself between the preset high and low limits and that is what heats the DHW.
If this is the case, can I install a timer on this boiler so that it is not constantly running to make DHW at times that it's not needed?
What type/make of timer could I purchase to accomplish this?
Happy holidays, Vic
#4
If it were me (and I have done this for summer months for many years) I would save the money of the timer and the installation and what I do is just reach to the red boiler switch on my kitchen wall (or it could be located just inside a door leading to the boiler, such as at the entrance to the basement) and turn that wall switch off until awake in the morning. consider it!