Troubleshooting | A.O. Smith HW 610 specification

TROUBLESHOOTING

CER-TEMP 80 RECOVERY SYSTEM CHECKOUT PROCEDURE

Use this checkout for Cer-Temp 80 Recovery Systems. (For hot water supply application only)

	Checkout Sequence	System Operation		Cause	Remedy
	Checkout Sequence	Contact	Incorrect	Cause	Remedy
		Contact	Incorrect
			Pump and burner remain	Tank temperature control	Replace.
			Pump and burner remain	(thermostat) defective.
		Circulating pump and	on.	System wiring is	Correct wiring.
		Circulating pump and		incorrect.	Correct wiring.
	Set tank temperature	burner shut off.		incorrect.
	control (thermostat) 20°F		Circulating pump on.	Pump wired for	Correct wiring.
	(10°C) below tank water	With thermal balancer,	Circulating pump on.	continuous operation.	Correct wiring.
	(10°C) below tank water	With thermal balancer,		continuous operation.
	temperature.	pump off delay of
	temperature.	pump off delay of		Gas valve stuck or	Correct or replace
		approximately 2 minutes.		Gas valve stuck or	Correct or replace
		approximately 2 minutes.	Burner on.	defective.	valve.
				defective.	valve.
				System wiring is	Correct wiring.
				System wiring is
				incorrect.
				incorrect.
				High limit control set too	Replace. (If problem
				low.	proven to be at this
				High limit control	control by applying
				differential too wide.	jumper to terminals.)
			Circulating pump on.	System wiring is	Correct wiring.
			Circulating pump on.	incorrect.	Correct wiring.
				incorrect.
	Set tank temperature			Coil protector switch has	Remove control cover,
	control (thermostat) 20°F	Circulating pump and		activated.	depress reset button.
	(10°C) above tank water	burner on.		Gas valve or wiring	Check wiring. Repair or
	temperature.			defective.	replace valve.
				Power off or system	Check power supply
			Circulating pump and	wiring is incorrect.	and wiring.
			burner off.	Tank temperature control	Replace.
				Tank temperature control	Replace.
				(thermostat) defective.
			Burner on.	System wiring is	Correct wiring.
			Burner on.	incorrect.	Correct wiring.
				incorrect.
				High limit control
	Boiler outlet temperature	Circulating pump on.	Circulating pump and	defective, or set too high	Replace.
	exceeds 210°F (100°C).		burner on.	(max. should be set at
				200°F).
	Set tank temperature
	control (thermostat)	System maintains desired
	for desired water	water temperature.
	temperature.

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A.O. Smith HW 610 warranty Troubleshooting, CER-TEMP 80 Recovery System Checkout Procedure

Contents

Tennessee Waltz Parkway Ashland City, TN Models HW 300, 399, 420, 520, 610 Important Definitions Safe INSTALLATION, USE and Service General Safety Table of Contents Propane Natural Dimensions and Capacity Data 27.7 33.3 Recovery Capacities LIQUefied petroleum gas models High Altitude InstallationsIntroduction Controls and Function GPM LPM Manual Reset High LimitHigh Limit Switch Safety Flow Switch Thermal Balancer Safety Relief Valves Tank Temperature Control Required Ability GeneralThermometers Drain Valve Not Supplied Unconfined Space Confined Space S. InstallationsCanadian Installations AIR Requirements Leveling Installation ClearancesTypical Boiler Installation Venting Vent Connection Vent Pipe InstallationConnecting Boiler to a Common Vent Draft Hood Venting System Venting Sidewall Optional Power Vent SystemMultiple Vent Table Model HW-300 Boiler Combined Vent Sizing Tables ONE Boiler Installed Independent of the Primary System System InstallationsConventional Installations LINEAR-TEMP Installations Minimum Branch Sizes to Boilers NO. Suggested Items for InstallationSchematic of the LINEAR-TEMPSYSTEM Boiler Inlet Outlet Sizes GAS Connections Correct GAS Purging and Sizing Model Rated Manifold Pressure Number Input Natural Propane ExampleSpecific Multiplier Gravity GAS Pressure Regulators Wiring Connections Wiring HW 300 thru 670. Natural and Propane GAS U.S. & Canada HW 300 toD. System Single Stage I.I.D. Honeywell GAS Valve LINEAR-TEMP Installations Boilers and Secondary Circulator are Controlled by Page MODELS, Jucntion BOX W/4 Terminals Canadian MODELS, Junction BOX W/6 Terminals Canadian MODELS, Junction BOX W/6 Terminals Schematic MODELS, Junction BOX W/4 Terminals MODELS, Junction BOX W/4 Terminals USE this Table for Correct Pump and Water Pipe Size Wiring Figures 16 and 17 on Pages 24Piping Commercial Boiler with Vertical Tank Commercial Boiler with Horizontal Tank Commercial Boiler with Vertical TANK, CER-TEMP Wiring Figures 21 to 27 on Pages 28 to HW-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 Main Burner Operation and START-UP InstructionsFilling the System Pilot and Main Burner Pilot 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 Setting Relief Valve General MaintenanceManual Reset High Limit Switch Continuity Test Internal Contaminants Cleaning and Flushing InstructionsPRE-TROUBLESHOOTING HOT Water Supply Boilers Preventive Maintenance CER-TEMP 80 Recovery System Checkout Procedure Troubleshooting YES Is there excessive draft conditions that may cause pilot Burner ignition problems?Is ceramic insulator surrounding the electrode in good Condition not cracked or broken? MV & MV/PV? Replace pilot burner assembly OFF LED Status and TroubleshootingLocation of LEDs Flame LED Yellow Status LED Green No Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty