Alfonso’s Test

• Thermostat

• Switch

• 24v

• Maintains Temperature

• Voltage, Continuity, Temp

• Service switch

• Switch

• 120v

• Shuts off power to service boiler

• Voltage, Continuity AMP’s (optional)

• Aquastat

• Voltage source, switch, load

• 24v, 120v

• Maintains the water temperature in a boiler & sends 120v to the pump (turns on the power)

• Voltage

• Pump

• Load

• 120v

• To circulate water into the system

• Voltage, OHM’s, AMP’s

• Coil Relay

• Switch

• 24v, 120v

• Turning on bigger loads with lower voltage

• Voltage, OHM’s, Continuity

• Roll-Out Switch

• Switch

• Shuts all burners off if there’s a flame rollout

• Voltage, Continuity, Temp

• Fuse Link

• Switch

• 24v

• Shuts all burners off if there’s a flame rollout

• Voltage, Continuity, Temp

• Gas Valve

• Load

• 24v

• Allows gas into the burners

• Voltage, OHM’s, Water Column, AMP’s (Optional)

• Effikal Damper

• Switch, Load

• 24v

• Opens when you call for heat, closes when no heat is called. Makes boiler 5% more efficient

• Voltage

• Taco Zone Valve

• Switch, Load

• 24v

• To release water into a specific zone when you call for heat

• Voltage

• Honeywell Zone Valve

• Switch, Load

• Opens when you call for heat, to heat up a specific zone or whole apartment

• Voltage

• Ball Valve, Gate Valve, Plug Valve

• To stop the water flow (to service or replace a part)

• Check Valve or Back Flow Preventer

• Only allows water to flow in 1 direction. All boilers must have one of these

• Water pressure reducing valve

• Reduces the city’s pressure from 30psi to 12psi

• Automatic Air Vent or Manual Purge

• Separates air from the vent system. If water is leaking from your air vent, the vent needs to be replaced. In order to remove air from system manually, (system keys) psi needs to be at 25, then back at 12 when done

• Expansion Tank

• Provides extra space/volume when the pressure in the piping circuit increases as water heats & expands

Mechanical Parts Hot Water Boiler (Hydronics)

• Aquastat

• Maintains the temperature of the water, & turns on the pump. Sends 24v to gas valve

Mechanical Parts Hot Water Boiler (Hydronics)

• Pump or Circulator

• Forced hot water from the heat source boiler, through the piping to the heat transfer units & back to the boiler

Mechanical Parts Hot Water Boiler (Hydronics)

• Honeywell Zone Valve

• Electrical Valve to open & close the heating for zone. Regulate water flow to zones in a hydronic heating system

Mechanical Parts Hot Water Boiler (Hydronics)

• Taco Zone Valve

• Electrical Valve to open & close the heating for a zone. Regulate water flow to zones in a hydronic heating system

• Return Ball Valves

• Property purges the zone (removes air from system) When the manual air vents are missing/not installed

• Relief Valve

• Opens when the pressure in the boiler gets to or above 30psig. IB a safety device, only mechanical part in a boiler

• Supply Manifold

• Manages GPM & the speed of the water that goes to the zones

• Pressure Gauge

• Tells you pressure (PSIG) & Temperature (F•)