A.O. Smith HW 610 warranty Pilot Burner Electronic Ignition

Page 40

4.Reinstall the burner manifold assembly on boiler.

5.Restore electrical power and gas supply to boiler.

•Put the boiler back in operation by following the lighting instructions in this manual or on the lighting and operating label on the boiler. See pages 43 - 44.

•Check for gas leaks and proper boiler and vent operation.

2.PILOT BURNER - ELECTRONIC IGNITION

To establish pilot flame without main burner operation, it will be necessary to perform the following steps:

Servicing of the pilot burner (every six months) includes keeping pilot shield (not shown) free of lint, cleaning the burner head, the primary air opening and the orifice of the pilot burner, Figure 35.

1.Open fused disconnect switch or shut off electrical power to the boiler.

2.Disconnect wire from MV wire on valve.

3.Close fused disconnect switch to restore electrical power to the boiler.

The pilot will now ignite provided the system is calling for heat.

4.Adjust pilot flame.

To adjust the pilot flame, remove the cap screw from the pilot adjusting screw (Figure 36) and turn to deliver a sufficient flame at the pilot burner to cover 3/8" to 1/2" (10-12mm) of the sensing probe tip. See Figure 35.

FIGURE 35.

Check for good terminal connection at the sensing probe at the pilot burner assembly if pilot does not light.

Check for electrical power to the valve. If electrical power and gas are present at the valve and the pilot does not operate when system calls for heat, replace valve.

5.Low gas pressure

•Adjust pilot flame by means of the pilot gas adjustment located in the gas valve.

•The pilot flame should envelop 3/8 to 1/2 inch of the tip of the thermocouple. Remove pilot adjustment cover screw, Figure 36. Turn inner adjustment screw or pilot adjusting valve clockwise to decrease, or counterclockwise to increase pilot flame. Be sure to replace cover screw on combination gas valve after adjustment to prevent possible gas leakage.

GROUND

TERMINALS (2)

GAS VALVE KNOB

PRESSURE REGULATOR

ADJUSTMENT

INLET

PILOT

OUTLET

PILOT ADJUSTMENT

GAS (UNDER CAP SCREW)

CONTROL

PILOT ADJUSTMENT

OUTLET

 

UNDER SCREW

PILOT SUPPLY

FIGURE 36.

6.Clogged pilot burner orifice.

•Clean or replace orifice. A clogged orifice will restrict gas flow and result in low thermocouple output.

7.Incorrect orifice.

•Replace. The Orifice size is stamped on the wrench flats.

8.Clogged primary air opening.

•Restricted air passages will sof ten the pilot flame and result in poor thermocouple flame impingement.

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Contents Models HW 300, 399, 420, 520, 610 Tennessee Waltz Parkway Ashland City, TNSafe INSTALLATION, USE and Service Important DefinitionsGeneral Safety Table of Contents Dimensions and Capacity Data Propane NaturalRecovery Capacities 27.7 33.3Introduction High Altitude InstallationsLIQUefied petroleum gas models Controls and Function Manual Reset High Limit High Limit Switch Safety Flow SwitchThermal Balancer GPM LPMSafety Relief Valves Tank Temperature Control General ThermometersDrain Valve Not Supplied Required AbilityConfined Space S. Installations Canadian InstallationsAIR Requirements Unconfined SpaceInstallation Clearances Typical Boiler InstallationVenting LevelingVent Pipe Installation Connecting Boiler to a Common VentDraft Hood Vent ConnectionMultiple Vent Table Venting Sidewall Optional Power Vent SystemVenting System Combined Vent Sizing Tables Model HW-300 BoilerSystem Installations Conventional InstallationsLINEAR-TEMP Installations ONE Boiler Installed Independent of the Primary SystemNO. Suggested Items for Installation Schematic of the LINEAR-TEMPSYSTEMBoiler Inlet Outlet Sizes Minimum Branch Sizes to BoilersGAS Connections Purging and Sizing Correct GASExample Specific Multiplier GravityGAS Pressure Regulators Model Rated Manifold Pressure Number Input Natural PropaneWiring Wiring ConnectionsHW 300 to D. SystemSingle Stage I.I.D. Honeywell GAS Valve HW 300 thru 670. Natural and Propane GAS U.S. & CanadaLINEAR-TEMP Installations Boilers and Secondary Circulator are Controlled by Page Canadian MODELS, Junction BOX W/6 Terminals MODELS, Jucntion BOX W/4 TerminalsCanadian MODELS, Junction BOX W/6 Terminals Schematic MODELS, Junction BOX W/4 Terminals MODELS, Junction BOX W/4 Terminals Wiring Figures 16 and 17 on Pages 24 PipingCommercial Boiler with Vertical Tank USE this Table for Correct Pump and Water Pipe SizeCommercial Boiler with Horizontal Tank Wiring Figures 21 to 27 on Pages 28 to Commercial Boiler with Vertical TANK, CER-TEMPHW-300 HW-399 HW-420 HW-520 Three HW-520s, HW-610s or HW-670s UP-FLOW Model USE this Table for Correct Pump and Water Pipe Size Operation and START-UP Instructions Filling the SystemPilot and Main Burner Main BurnerPilot Burner Electronic Ignition Consumption Rate Checking and Adjusting the InputRefer to Operating at Full Input or Full Capacity Stage Main Burner Operation Flame Current Sensed For Your Safety Read Before Lighting SET T HE Thermostat to Lowwest Setting URN Pilo T Firing VA LVE CounterclockwiseManual Reset High Limit Switch Continuity Test General MaintenanceRelief Valve Cleaning and Flushing Instructions PRE-TROUBLESHOOTINGHOT Water Supply Boilers Preventive Maintenance Internal ContaminantsTroubleshooting CER-TEMP 80 Recovery System Checkout ProcedureYES Burner ignition problems? Is ceramic insulator surrounding the electrode in goodCondition not cracked or broken? Is there excessive draft conditions that may cause pilotMV & MV/PV? Replace pilot burner assembly LED Status and Troubleshooting Location of LEDs Flame LED YellowStatus LED Green OFFNo Call for Heat Not applicable None OFF Limited Warranty Conditions and Exceptions
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