A.O. Smith HW 610 warranty Checking and Adjusting the Input, Consumption Rate

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CHECKING AND ADJUSTING THE INPUT

1.Follow steps 1 thru 6 of the OPERATING INSTRUCTIONS.

2.Attach a pressure gauge or a manometer to the manifold pressure tapping and refer to table 10 for correct manifold pressure.

3.Follow steps 7 thru 11 of the OPERATING INSTRUCTIONS.

4.Use this formula to “clock” the meter. Be sure that other gas consuming appliances are not ON during this interval.

3600 x H = Btuh

T

Btuh = The approximate actual input rate.

T = Time in seconds to burn one cubic foot of gas.

H = Heating value of the fuel gas in Btu per cubic foot of gas.

EXAMPLE:

T = 9.0 seconds/ft3

H= 1050 Btu/ft3(natural gas) Btuh = ?

Gas flow through meter:

3600 x 1050 = 420,000 Btuh

9.0

Small changes in the input rate may be made by adjusting the manifold pressure, see GAS PRESSURE REGULATORS. Under no circumstances should you exceed the maximum input rate for the boiler given in table 2 on page 6.

5.Repeat steps 1 thru 6 of the OPERATING INSTRUCTIONS.

6.Remove the pressure gauge or manometer from the manifold pressure tapping. Replace the screw-in plug in the manifold pressure tap.

7.Repeat steps 7 thru 11 of the OPERATING INSTRUCTIONS. The boiler will resume normal operation.

When the boiler is operating at full capacity, or full gas input, it should consume 1 cu. ft. of gas in approximately the time indicated in table 10.

TABLE 10.

CONSUMPTION RATE

(Refer to Operating at Full Input or Full Capacity)

	Heating	Time to Consume 1 cu. ft. of gas (seconds)
	Heating
Type Gas	Value	HW-	HW-	HW-	HW-	HW-	HW-
	Btu/Ft.	HW-	HW-	HW-	HW-	HW-	HW-
	Btu/Ft.	300	399	420	520	610	670
		300	399	420	520	610	670

Natural	1050	12.6	9.5	9.0	7.3	6.2	5.7

Propane	2500	30.0	22.6	21.4	17.3	14.8	13.4

IMPORTANT

UNDER NO CIRCUMSTANCES SHOULD THE GAS INPUT EXCEED THE INPUT SHOWN ON THE BOILER MODEL AND RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE BOILER. Minor variances from input on rating plate can be corrected by adjustment of gas pressure regulators described in GAS PRESSURE REGULATORS section of this manual.

The inlet gas pressure must not exceed or be less than the values shown on rating plate.

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Contents Tennessee Waltz Parkway Ashland City, TN Models HW 300, 399, 420, 520, 610Important Definitions Safe INSTALLATION, USE and ServiceGeneral Safety Table of Contents Propane Natural Dimensions and Capacity Data27.7 33.3 Recovery CapacitiesLIQUefied petroleum gas models High Altitude InstallationsIntroduction Controls and Function High Limit Switch Safety Flow Switch Manual Reset High LimitThermal Balancer GPM LPMSafety Relief Valves Tank Temperature Control Thermometers GeneralDrain Valve Not Supplied Required AbilityCanadian Installations Confined Space S. InstallationsAIR Requirements Unconfined SpaceTypical Boiler Installation Installation ClearancesVenting LevelingConnecting Boiler to a Common Vent Vent Pipe InstallationDraft Hood Vent ConnectionVenting System Venting Sidewall Optional Power Vent SystemMultiple Vent Table Model HW-300 Boiler Combined Vent Sizing TablesConventional Installations System InstallationsLINEAR-TEMP Installations ONE Boiler Installed Independent of the Primary SystemSchematic of the LINEAR-TEMPSYSTEM NO. Suggested Items for InstallationBoiler Inlet Outlet Sizes Minimum Branch Sizes to BoilersGAS Connections Correct GAS Purging and SizingSpecific Multiplier Gravity ExampleGAS Pressure Regulators Model Rated Manifold Pressure Number Input Natural PropaneWiring Connections WiringD. System HW 300 toSingle 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 MODELS, Jucntion BOX W/4 Terminals Canadian MODELS, Junction BOX W/6 TerminalsCanadian MODELS, Junction BOX W/6 Terminals Schematic MODELS, Junction BOX W/4 Terminals MODELS, Junction BOX W/4 Terminals Piping Wiring Figures 16 and 17 on Pages 24Commercial Boiler with Vertical Tank USE this Table for Correct Pump and Water Pipe SizeCommercial Boiler with Horizontal Tank Commercial Boiler with Vertical TANK, CER-TEMP Wiring Figures 21 to 27 on Pages 28 toHW-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 Filling the System Operation and START-UP InstructionsPilot and Main Burner Main BurnerPilot Burner Electronic Ignition Refer to Operating at Full Input or Full Capacity Checking and Adjusting the InputConsumption Rate Stage Main Burner Operation Flame Current Sensed For Your Safety Read Before Lighting URN Pilo T Firing VA LVE Counterclockwise SET T HE Thermostat to Lowwest SettingRelief Valve General MaintenanceManual Reset High Limit Switch Continuity Test PRE-TROUBLESHOOTING Cleaning and Flushing InstructionsHOT Water Supply Boilers Preventive Maintenance Internal ContaminantsCER-TEMP 80 Recovery System Checkout Procedure TroubleshootingYES Is ceramic insulator surrounding the electrode in good Burner ignition problems?Condition not cracked or broken? Is there excessive draft conditions that may cause pilotMV & MV/PV? Replace pilot burner assembly Location of LEDs Flame LED Yellow LED Status and TroubleshootingStatus LED Green OFFNo Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty