Rads not heating

[lattin]

Hello guys, I looked at heating system yesterday. A large 2 story house with 2 story extension at back. The rads to extension never worked. Its a 90,000 btu oil fired boiler. Pipes from boiler are 22mm (should be 28mm) coming from shad near house. From what I can see I think flow and return for extension were teed into the existing flow and return undreground between boiler and house. I might put in a stronger circulating pump. If that doesent work, would pressuring the system make a difference to give system equal pressure.

 

[ShaunCorbs]

What’s the existing pump and how many rads ?

 

[lattin]

Pump looks old. Original house built 23 years old. Maybe 10 - 12 rads

 

[ShaunCorbs]

I would try swapping the pump first

 

[lattin]

In general does a sealed system circulate better than open system? . Might have to take up floor boards

 

[lattin]

Hi Guys

Can anyone tell me what is "Index Circuit Resistance"

 

[ShaunCorbs]

The resistance of the circuit eg boiler, pipe work and radiators

 

[lattin]

OK friction