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.

Do NOT drain the boiler. Admitting fresh water to the boiler
only results in increased corrosion.

Phooey. He HAS to drain the FillTrol tank, at a minimum -- and since his
problem is that the system isn't full, he can't possibly avoid admitting fresh
water to the system. He doesn't have enough water in it. There is _no_way_ to
fix his problem without admitting fresh water.

In any event, as soon as the oxygen that's in the fresh water is used up,
there won't be any *additional* corrosion. The real big corrosion problem in
hydronic systems comes from the *continual* admission of fresh water in the
case of a slow leak (which is why it's recommended to close the fill valve
once the system's full).

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

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