Toggle's Appliances
Oil -fired steam heat and domestic hot water plant.
Burnham Brand boiler
Riello brand burner head.
Left in black= oil filter.
beige, (bottom-left)= circulator to push (non-potable)hot water to basement heating loop via baeboard style convectors ("radiators").
You can also see the Hartford Loop made of 2" wide steel threaded pipe that goes up across and then down This it to keep the water in the boier in case of slight over-fill and when the steam is fresh and not yet dry (superheated). As the steam becomes "dry" it rises and flows by gravity to the radiators.
Green boxes (left side) relay for low-votlage control (24v). One is to control the burner the other is to control the circulator -- allows for a 24v thermostat.
Green round valve (left-side near top.) Thermostatic mixing valve (non-electric) cools water to safe temp by introducing cold to hot water feed line.
Between red valves is water-level viewing gauge. In a steam boiler the water level i partially full, in a hot water boiler it is entirely full.
Left of red valves is water level sensor that---
a) adds water by shooting a signal to the black box back-right (trace the wires).
b) turns off heat should boiler run dry.
Even further left of that is the pressure-limit control switchover a pipe pig-tail. shuts off burner when system is pressureized. cycles burner on and off as home is being heated.
Shoulf that control fail, there is a mechanical pressure relief vavlve above that. It prevents explosions due to steam build-up.
Domestic hot water needs are met by a coil on the right side.
You can see the grey thermostat (aquastat) that maintains the minimum boiler temp, when steam is not needed.
