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nozzle size can be worked out by dividing the heat input(btu,s) by 140000 to give you gph(gallons per hour)

YOUR GPH (Gallons per hour ) can be worked out by dividing the heat input of your boiler by 140000 Square combustion chambers normally fire 70 - 90 degree angle whilst longer, narrower chambers 30- 60 degree. Pump pressure at 100 psi as that is what the nozzles are tested at. if the nozzle...

these boilers will fire if water drops below 10 degrees

what do the tanks supply water to? maybe you have oversized storage and you are getting stagnation. The amount of water stored should be for 1 days use. The tank should be fitted with a lid, flyscreen and lagged. The film on top of your tank sounds as though it may be caused by stagnation...

YOU have to remove the burner cover to see the oil pump. That picture is the water pump,.

YOU MUST HAVE A LEAK

personally i would remove it

is it a thermostatic valve on the radiator, if so it may not be bi flow and could be on the wrong way round. Their should be an arrow on the valve stating direction of flow.

plate heat exchanger could be leaking across(very slightly) to primary circuit. prv leaking Excessive air in system

No reason why you cant use a kitchen cabinet as long as you havd the room.

DOESNT MATTER

You can use the vacuum port to check whether the oil line is sound as this is the suction side of the pump.You would probably not get a reading, or a slow falling reading if the oil supply pipe had any leaks in it

check that the ballvalve is filling the tank adequately

Open flued boilers require ventilation. You CANNOT connect a balanced flue to a chimney you will need to replace the boiler for a balanced flue room sealed model and disregard the chimney.[/i]

The 30ci has a modulating burner.Minimum heat output is 10.8kw and maximum heat output is 29.6kw. A gas rate and burner pressure test would confirm that your boiler is operating at the correct settings. As for the room thermostat, the point at which the stat is satisfied would depend on many...

Should be valve located on inlet to boiler

you have a 15mm supply to the pump and a 22mm supply from the pump to the shower? A Shower pump is designed to push water rather than pull it, so the feeds to the pump must be adequate to supply the outlet pressure.ie you may be trying to pump water at a greater rate than the supply will allow.

fill boiler to 1.5 bar if expansion takes it up to 3 bar(when hot) then the expansion vessel is failing. the prv maybe faulty and leaking, hence pressure drop, but to be honest this is quite rare.

sound like pump not working