Electrical wiring of my previous 220 240 Volts (high voltage) thermostat to my gas heater

21 Dec

default wiring for high voltage thermostat

220v thermostat wiring dry switch

to all, above is a drawing of my previous configuration using a “2-wire” thermostat, high voltage that is 220 240 Volts, directly connected to my gas heater.

couple of key points:

#1 the thermostat had batteries internally used to trigger the “dry switch” (now on the drawing).

#2 upon “heat” command (ambiant temperature below target) the “dry  switch” basically closes the electrical path between Ls and Lr

#3 once Ls and Lr are connected together, this triggers the heater (gas + circulator)

#4 Ns connector is shown although not used in this configuration since thermostat operates from its own supply (internal batteries)

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