Boiler Limit Switch Wiring Diagram. Set system switch to off. 2 hazard definitions the following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to.
When a room thermostat calls for heat the gcm starts the system circulator and blower. The gcm control module responds to signals from the room thermostat air pressure switch inlet water sensor and boiler limit circuit to operate the circulators gas valve igniter and blower. Replace or clean the air filter.
Check for 120 volts at the line voltage terminal block located inside the top left electrical compartment.
Built in load matching pump contributes to savings in electrical usage. Viessmann develops intelligent and sustainable energy systems for residential and commercial buildings. Zone valve 24 volt thermostat transformer wiring. An inductor motor draws huge current while starting which can cause mechanical as well as winding damage.