Hand-Drawn 24V Thermostat, Transformer, Relay & Fan Switch Wiring Diagram

This is a simple hand-drawn wiring diagram (digital sketch) showing the low-voltage and line-voltage connections for what appears to be a heating/HVAC control circuit. Five labeled component boxes are shown: a Transformer (green box), Thermostat (red box), Valve (blue box), Relay (cyan box), and Fan Switch (yellow box). Two supply wires labeled '110v from breaker' feed the Transformer. The Transformer outputs 24v on two circuits: one 24v wire runs to the Thermostat and another 24v wire runs down to the Valve. The Thermostat connects via a 24v wire to the Relay, and the Valve also connects to the Relay via a 24v wire. From the Relay, two wires each labeled '110v' run to the Fan Switch. A reader can learn the basic control topology: household 110V power steps down through a transformer to a 24V control circuit that links the thermostat, valve, and relay, with the relay switching 110V power to the fan switch. No part numbers, wire colors (beyond box outline colors), fuse ratings, terminal designations, or applicability information (year/make/model) appear anywhere in the drawing.