A.O. Smith 500 User'S Information Manual Download Page 5 | Manualshive

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Figure 1A. CCB (Drawing #211758)

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Summary of Contents for 500

Page 1: ...f any part has been under water Immediately call a qualified service technician to inspect the boiler and to replace any part of the control system and any gas control which has been under water CAUTI...

Page 2: ...er is installed in a carpeted alcove the entire floor must be covered with concrete blocks or use the A O Smith Combustible Floor Kit Base FLAMMABLE ITEMS PRESSURIZED CONTAINERS OR ANY OTHER POTENTIAL...

Page 3: ...s the user s hot water needs This will also provide the most energy efficient operation of the water heater and minimize scale formation SETTING THE WATER HEATERTEMPERATUREAT 120 F WILL REDUCE THE RIS...

Page 4: ...D The EMC5000 control system is a fully integrated state of the art electronic control system It consists of sensors output devices a power switch a 24vac transformer wiring and the following printed...

Page 5: ...5 Figure 1A CCB Drawing 211758...

Page 6: ...6 Figure 1B FCB Drawing 211759...

Page 7: ...7 Figure 1C PDB Drawing 211760...

Page 8: ...mp Provides electrical power to directly operate a pump or the coil of an externally connected contactor Powered Vent CCB 24vac optional Provides electrical power to operate a powered vent Low and Hig...

Page 9: ...the factory or by authorized trained personnel only Once set at installation they generally remain that way for the duration of the life of the product If a switch is changed power must be cycled bef...

Page 10: ...checks the status of the flame sensor 16 Steps 12 through 15 are then repeated for stage 3 and 4 17 The system is now in the heating mode with all four stages on and will remain in this mode until the...

Page 11: ...h Speed Blower is on Low Speed Blower Prover when either the High or Low Speed Blowers are on Igniter Current for an on condition approximately 18 seconds after the Igniter is turned on until the igni...

Page 12: ...e turned off Pre Purge State If the stage does not have a blower this state is skipped and the system advances to the Heat Igniter State Otherwise the Blower is turned on After 10 to 34 seconds 34 sec...

Page 13: ...tial setpoint before a call for heat can be generated HIGH LIMIT DIFFERENTIAL SETPOINT ADJUSTMENTPROCEDURE The High LImit Differential Setpoint has a range of 1 Degree F to 50 Degrees F for all models...

Page 14: ...14 CONNECTION DIAGRAM Drawing 211769 FIGURE 4...

Page 15: ...15...

Page 16: ...screens to reach a desired item and to change setpoints and user settings They have an auto increment decrement feature for some of the configurations and values When you first press one of the keys...

Page 17: ...ode Flashing HARD Caused when the micro executes software code in an incorrect manner Contact factory A D Fail CCB Error in analog input reading Flashing HARD Caused when the Analog to Digital convert...

Page 18: ...on the connector at the end of the probe cable The value should be approximately 10K ohms value will change slightly with changes in temperature Outlet Probe Outlet probe shorted or open Flashing HAR...

Page 19: ...system to run through all operating steps up to flame sensing 7 Proper operation of the flame sensing circuit can be almost completely verified through the use of a 14007 diode The anode end of the d...

Page 20: ...20 NOTES...

Page 21: ...21 NOTES...

Page 22: ...22 NOTES...

Page 23: ...ed warranties including any warranty of merchantability imposed on the sale of this boiler under state law are limited to one 1 year duration for the boiler or any of its parts Some states or province...

Page 24: ...24 ADIVISION OFA O SMITH CORPORATION MC BEE SC RENTON WA STRATFORD ONTARIO VELDHOVEN THE NETHERLANDS www hotwater com...

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