A.O. Smith 500 - Manuals - manualsarea.com

Page 3 - LIGHTING INSTRUCTIONS; WARNING; Some local codes; TEMPERATURE REGULATION; DANGER; Table 1: Risk of Scalds; BOILER LOCATION

3 LIGHTING INSTRUCTIONS These models have an automatic hot surface ignition systemmounted on the combustion chamber panel inside the frontjacket. This hot surface igniter ignites the main burner gaswhenever the system control calls for heat. Before proceeding with operation of the unit, make sure th...

Page 4 - BURNER SYSTEM; The burners should display the following characteristics:; CHEMICAL VAPOR CORROSION; CAUTION; Inputs To CCB and FCB:; • Temperature Sensors:

4 the surrounding air pressure. Inspection of the boiler and ventsystem is necessary to insure that flue gas leakage to thesurrounding area does not occur. Inspect the external surfaces of the vent system every 3 monthsfor corrosion and leakage. Inspect the vent terminations forc o r r o s i o n a n...

Page 8 - Line Polarity Indicator & Fuse Protection; Igniters

8 closed and everything else is in the proper state, a "call forheat" condition will be initiated. These leads should beshorted together, when a thermostat is not being used. If it isdesired that the thermostat control the temperature of theboiler, the operating setpoint of the system should...

Page 10 - Temperature Setpoints (System Control Algorithm); Stages 1 and 2 will turn on in sequence from 1 to 2.; UIM Operating Procedures

10 • Stored values are recalled from memory. • Configuration dipswitches are read. • Pending faults are recalled • Micros on all boards start running (indicated by a flashingYellow LED near each micro) • Input sensors are read • C o m m u n i c a t i o n s b e t w e e n m i c r o s a n d b o a r d s...

Page 11 - Description of CCB control states:; Status Displayed

11 The operation of these parts is described below: UIM Screens: On all screens a double vertical bar appears on the right side ofthe display each time a key is touched to indicate that a key hasbeen activated. On several screens an indicator ">" appears onthe left side of the display to ...

Page 12 - One hour passes (Soft fault automatic restart after one hour); Description of FCB control states:; cold purging) the system switches to the Heat Igniter State.

12 except the fault states. If enabled the powered vent and theIRI gas valve are turned on. A command is sent to all activestages to cold purge the system. Cold purging clears outany combustion gas that may be in the combustion chamber.When purging is complete the system moves to the HeatState. • He...

Page 16 - UIM Touch Switches; UIM LED’s

16 Number of cycles for each stage (Number of times stagehas been in heat mode).Kbtu rating of the boiler (0 to 5750Kbtu in 10Kbtu increments)The software revision level of the CCB, and FCB micro-controllers. Current Error Screen: • Displays the last error that the system has detected plus atimestam...

Page 17 - TROUBLESHOOTING IGNITION SYSTEM; Fault Displayed

17 TROUBLESHOOTING IGNITION SYSTEM Fault Messages and Lockout Status (* = stage number: 1 or 2) Fault Displayed Description Red LED Lockout “Display Fail” Communications with UIM interrupted Continuous Auto Reset • Check communication cable to UIM. Try moving to other Internal Communications connect...

Page 20 - NOTES

Page 23 - NEW BOILER LIMITED WARRANTY

23 NEW BOILER LIMITED WARRANTY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this hydronic boiler: 1. If within TEN years after initial installation of the boiler, the heat exchanger shall prove upon examination by the warrantor to be defective inmate...