How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Rick Your Own Question

Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 13674
Experience:  40+ yrs. experience as a licensed oil & gas technician.
Type Your HVAC Question Here...
Rick is online now
A new question is answered every 9 seconds

I have a boiler with a L8124A, C, L8151A triple aquastat relay.

Resolved Question:

I have a boiler with a L8124A, C, L8151A triple aquastat relay. The boiler heats 2 different buildings, both hot water, not steam. My house t-stat is wired into the 8124A as is the circulator pump, everything working fine on that side. A 2nd building, work shop\mancave has a hydronic unit with fan & seperate circulator pump wired into a TACO SR501 switching relay controlled by a t-stat in that building. When my house circ pump comes on, the boiler fires up within 15 seconds to maintain the water temp presumably controlled by the 8124A. When the work shop heat comes on, the boiler doesn't fire until the water temp drops to the low setting & calls for a hotter water temp. Is there a way to wire the Taco SR501 switching relay into the L8124A auxillary terminals-zone control so that when the shop calls for heat, the boiler fires in the same manner as the house to maintain a hotter temp? This should give me hotter air exiting the hydronic unit with less overall run time.
Submitted: 4 years ago.
Category: HVAC
Expert:  Rick replied 4 years ago.
Hi threshold

Wire the 6N/O and the 5 terminal to TT on the operating control on the boiler. This assumes you are using 3 & 4 to control the circ and there are no line voltage jumpers to 5 or 6.
Customer: replied 4 years ago.

rick, the circ pump is wired to 4 N/O & of course neutral. The house tstat is currently wired to TT on the operating control on the boiler, can a 2nd set of t-stat wires be added to it without interfering with anything? No line voltage jumpers to 5 or 6, only H to 3 on the taco sr501.

Expert:  Rick replied 4 years ago.
TT is a switch leg that will pull the burner in but if you are also controling the other zone's circ with this control then you will also pull the circ in if the SR501 calls so you will need to add a second relay (wired the same way as the shop SR501) to control the circ (and burner control) for the house zone. It doesn't matter if you have 2 switch legs connected to TT. Once the switch is closed it won't matter if another one is closed as well.
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 13674
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Rick and 2 other HVAC Specialists are ready to help you
Customer: replied 4 years ago.
thanks Rick, I thought that might be the case, but it's worth getting pro info. Not the answer I was hoping for, but the right answer & thats what counts. If you ever need car or truck repair info, XXXXX@XXXXXX.XXX, I can help you there, 40+years to date-you'll not be charged by me, I won't be seeing my mail till tomorrow sometime, thanks again-Randy
Expert:  Rick replied 4 years ago.
Thanks for the offer but your email shows up X'ed out on my screen. They only allow us to communicate through this interface.

Thanks for using Just Answer

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial