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Those manual vents are irrelevant and are only to remove air from those pipes on system fill up.
The thermostat operating fire pump is on wrong place, - should be on return at cylinder.
Whoever did the gas boiler is responsible for the air in system, but connecting into dual heating systems is a bit of a minefield and rarely are dual systems actually properly designed or piped.
I assume the cylinder has 2 coils?
The thermostat operating fire pump is on wrong place, - should be on return at cylinder.
Whoever did the gas boiler is responsible for the air in system, but connecting into dual heating systems is a bit of a minefield and rarely are dual systems actually properly designed or piped.
I assume the cylinder has 2 coils?