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 Plumberpro Your Own Question

Plumberpro
Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience:  Heating and plumbing answers. 20 years experience
77408428
Type Your Plumbing Question Here...
Plumberpro is online now

Biasi M90E.24S wiring to Nest Thermostat question. Can anybody

Resolved Question:

Biasi M90E.24S wiring to Nest Thermostat question. Can anybody tell me which terminal on the boiler is the "Call-For-Heat" terminal?
Submitted: 1 year ago.
Category: Plumbing
Expert:  Plumberpro replied 1 year ago.
Plumberpro :

Hi , give me a few mins to check the wiring in the manual , thanks

Customer:

sure, no worries.

Plumberpro :

Hi . it will be 3 in metal he boiler wiring block . do you have the manual?

Customer:

okay, so the wall thermostat the I have replaced was wired to pins 1 & 3 and was a simple 'normally open' until it 'called for heat' when the circuit was 'closed' and the boiler kicked in.

Customer:

https://s3.amazonaws.com/support-assets.nest.com/images/tpzimages/Nest-Thermostat-Installation-Guide-UK.pdf

Customer:

in the nest wiring diagram in the link above on page 13, would the biasi common be pin 1?

Customer:

i.e. pin 1 common, and pin 3 'call for heat'?

Plumberpro :

Hi , I will check that link and come back in a few mins. But yes if the nest is a simple in and out then use the same wiring , but just double checking your link

Plumberpro :

Hi , yes 3 from boiler to 2 in heat link nest. , 1 in boiler to 1 in heat link nest

Plumberpro :

Just to put it simply 3 on boiler is common

Customer:

can I just confirm "1 in boiler to 1 in heat link nest"? 1 on the nest heat link is the 'normally closed' relay or "satisfied" terminal. Pin 3 on the nest is 'normally closed' or 'call for heat'

Customer:

sorry... Pin 3 on the nest is 'normally closed' c should have read 'normally open' or 'call for heat'

Plumberpro :

2 and 3 are the connection in the nest.2 is common and 3 is call for heat.according to the manual

Customer:

correct, so should pin 1 in the boiler not be wired to pin 3 'call for heat' on the nest heat link and not pin 1 ?

Customer:


Plumberpro says:

6:39 PM



Hi , yes 3 from boiler to 2 in heat link nest. , 1 in boiler to 1 in heat link nest



Plumberpro :

3 in boiler is common in nest and 1 call for heat . have you tried this ?

Customer:

I can't try it tonight Toby, the installation is at my holiday cottage. I'll be happy to give you a good rating if you can confirm that pin1 on the boiler is 'call for heat' and will connect to pin 3 in the nest which is also labeled 'call for heat' and that pin3 in the boiler is common and will connect to pin 2 on the nest which is labeled common.

Plumberpro :

Ok , just double checking

Plumberpro :

That's correct.

Customer:

cheers Toby.

Plumberpro :

Your welcome

Plumberpro, Plumber
Category: Plumbing
Satisfied Customers: 634
Experience: Heating and plumbing answers. 20 years experience
Plumberpro and other Plumbing Specialists are ready to help you

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
< Previous | 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • 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
  • 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
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • theplumber717

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
< Previous | Next >
  • http://ww2.justanswer.com/uploads/TH/theplumber717/2011-11-24_34039_DSCF7012.64x64.JPG theplumber717's Avatar

    theplumber717

    Plumber

    Satisfied Customers:

    516
    Lic plumbing and heating contractor, 28 years exp
  • http://ww2.justanswer.com/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    202
    Heating and plumbing answers. 20 years experience
  • http://ww2.justanswer.com/uploads/BI/billyjr1961/2013-9-27_11122_ATT1351123267229photo.64x64.JPG Billy's Avatar

    Billy

    Technician

    Satisfied Customers:

    206
    Mechanical Contractor
  • /img/opt/shirt.png Brian's Avatar

    Brian

    Plumber

    Satisfied Customers:

    47
    16 yrs. experience as plumber, including full bathroom and kitchen installations.
  • http://ww2.justanswer.com/uploads/MA/MarkAYng/2011-1-15_16358_Markcameo2008b.64x64.jpg MarkAYng's Avatar

    MarkAYng

    Handyman

    Satisfied Customers:

    0
    Knowledgeable in home, electrical and small appliance repair.
  • http://ww2.justanswer.com/uploads/AS/AssuredElectrical/2011-9-13_221243_me.64x64.gif AssuredElectrical's Avatar

    AssuredElectrical

    Home Improvement Enthusiast

    Satisfied Customers:

    332
    Electrical contractor's license