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 Dales-Electronic Your Own Question
Dales-Electronic, HVAC Technician
Category: HVAC
Satisfied Customers: 1498
Experience:  I am a Home Appliance / Refrigeration Technician of 25yrs+ with my own business and for multi-brand national companies.
Type Your HVAC Question Here...
Dales-Electronic is online now

I have a very old myson velair oil boiler and need to change

This answer was rated:

I have a very old myson velair oil boiler and need to change the control box can you tell me how to wire from Danfoss BHo 11 to a Danfoss obc 82

Good morning just a few question before we tackle this ~ why have you decided to fit the OBC82 when you can still get the BHO11, and does the extra work justify its fitting?

The link following takes you to a company that refurbishes the BHO11 if you cant find a new one ~~ ~~

Original wiring for the BHO111 ~~ ~~

Herewith the wiring for the OBC82 ~~ ~~

I note that you have viewed my post above, do you require further help? If not would you kindly rate my service to you using the smiley faces below, this allows me to shut down the question whilst letting you ask further questions on a free of charge basis if needed ~ Ian
Customer: replied 2 years ago.
I have wired the new control box as per wiring diagram ,which I had already done.
I have linked 8-3 as there is no pre-heater.have connected alarm wire to 10.
Do I need to link 4-5 as there is only 1 oil valve on the pump.
There is power to control box controlled by the boilerstat, green light on control box flashes green
but does nothing else. Dennis
Thanks for getting back to me, just back from working away, will have a check and come back to you shortly ~ Ian
Dales-Electronic and other HVAC Specialists are ready to help you