In article , Speedy Jim wrote:
Doug Miller wrote:

In article , Speedy Jim
wrote:

Adjust the FillTrol regulator to give the required system pressure
when Cold. This has nothing to do with the air pressure in the
bladder; this adjusts the pressure of city water connection to boiler.


Nope -- you didn't check the link he provided. The FillTrol is expansion tank
and pressure-regulating fill valve in one unit. The air pressure in the tank
bladder is what regulates the system pressure.


Yes, I did check the link.

Then you apparently didn't understand it.

The fill valve (regulator) is adjustable to set the boiler pressure.

*System* pressure.

The boiler needs more _water_. You won't get more
water by adding air to the exp tank end of things.

Incorrect. Being on the bottom of the system, the *boiler* is full of water,
and doesn't need any more. It's the *radiators* on the fourth floor that need
more water -- and they aren't going to get it until the static pressure in the
system is raised to at least equal that 38- to 40-foot head.

--
Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.