Posted by Jeff P on November 29, 1998 at 08:29:22:

In Reply to: Humming boiler posted by Robert on November 28, 1998 at 03:51:05:

A lot of 24 volt transformers have a hum. This is the small electrical unit that tranforms 120 volts down to 24 for the control wiring. You could either have a completely separate transformer mounted to the boiler or one built into an operating control. This is a very hard thing to describe what it looks like without knowing the boiler.

Replies:

• Re: Humming boiler Robert 09:42:25 11/29/98 (0)