No less than 18 mb inlet point

[Inverness]

hi guys. Serviced a boiler today at the meter working pressure 21mb and the boiler 16.5mb. But Worcester say 14 mb at the boiler? Any road 4.5mb drop across the pipework undersized. But my reading ratios where good.
Worcester 37 cdi combi. Cheers

 

[ShaunCorbs]

Length and size ?

 

[Inverness]

22mm pipe about 4meters and 4x22mm bends. I think this boiler requires 3.9 cubic meters of gas an hour. Co2 max 9.7 min 9.3 I'm happy with that. At the meter I run boiler at max and got 21mb. I then attached u gauge at inlet point of boiler 16.5mb at max. I'm now doubting my ability. I'm correct in this order?

 

[Scott_D]

1mb on pipewrk and 1.5 through gas valve
pipework undersizred or a blockage

 

[ShaunCorbs]

I would say check the inlet of the gas valve

 

[Inverness]

With it working at max?

 

[Scott_D]

Any other appliances

 

[Old Account]

I was thinking you are only allowed to have 1mb drop between meter and appliance. Am I mixing something right ?

 

[Scott_D]

Correct
some boiles have a loss through internal pipe and gas valve

I was thinking you are only allowed to have 1mb drop between meter and appliance. Am I mixing something right ?

 

[Chalked]

For a test point, just before the boiler and test again. Bet it’s better.