A.O. Smith HW 610 warranty Tank Temperature Control

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Code, Section IV or CSA B51, as applicable. Select a relief valve with a discharge NOT less than the boiler input, and a pressure rating NOT exceeding the working pressure of any component in the system.

A. O. Smith supplies a 125 psi relief valve for hot water supply systems and 50 psi relief valve for space heating application.

An ASME rated temperature and pressure relief valve must be installed on each and every water storage tank in a hot water supply system.

The storage tank temperature and pressure (T & P) relief valve must comply with the applicable contruction provisions of the Standard for Relief valves and Automatic Gas Shutoff Devices for Hot Water Supply Systems, Z21.22 - CSA 4.4. The T & P valve must be of the automatic reset type and not embody a single-use type of fusible plug, cartridge or linkage.

The T & P relief valve should have a maximum temperature rating of 100°C (210°F), a pressure rating NOT exceeding the lowest rated working pressure of any system component, and a discharge capacity exceeding the total input of the water boilers supplying water to the storage tank.

Locate the T & P relief valve (a) in the top of the storage tank or (b) in the side of the tank on centerline within upper 6 inches from the top of the tank. See Figures 28 to 33, Pages 34 to 38. Tapping shall be threaded in accordance with the latest version of the Standard for Pipe Threads, General Purpose (inch), ANSI/ASME B.120.1.

Mark location with a class III Label. See ANSI Z21.10.1, Part 1, Marking, See CAN/CSA B149.

TANK TEMPERATURE CONTROL

The water temperature in the storage tank is controlled by the Tank Temperature Control. The sensing element is mounted inside the hot water storage tank.

DANGER

HOT WATER TEMPERATURES REQUIRED FOR AUTOMATIC DISHWASHER AND LAUNDRY USE CAN CAUSE SCALD BURNS RESULTING IN SERIOUS PERSONAL INJURY AND/OR DEATH. THE TEMPERATURE AT WHICH INJURY OCCURS VARIES WITH THE PERSON’S AGE AND TIME OF EXPOSURE. THE SLOWER RESPONSE TIME OF CHILDREN, AGED OR DISABLED PERSONS INCREASES THE HAZARDS TO THEM. NEVER ALLOW SMALL CHILDREN TO USE A HOT WATER TAP, OR TO DRAW THEIR OWN BATH WATER. NEVER LEAVE A CHILD OR DISABLED PERSON UNATTENDED IN A BATHTUB OR SHOWER.

The tank temperature control is adjustable from 100°F (37.7°C) to 220°F (104.4°C). It is recommended that lower water temperatures be used to avoid the risk of scalding. It is further recommended, in all cases, that the water temperature be set for the lowest temperature which satisfies the user’s hot water needs. This will also provide the most energy efficient operation of the water heater and minimize scale formation.

THE WATER HEATER SHOULD BE LOCATED INANAREAWHERE THE GENERAL PUBLIC DOES NOT HAVE ACCESS TO SET TEMPERATURES. SETTING THE WATER TEMPERATURE AT 120°F (49°C) WILL REDUCE THE RISK OF SCALDS. Some states or provinces require settings at specific lower temperatures. Below you will find listed the approximate time-to-burn relationship for normal adult skin. Valves for reducing point-of-use temperature by mixing cold and hot water are available. Also available are inexpensive devices that attach to faucets to limit hot water temperatures. Contact a licensed plumber or the local plumbing authority.

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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 GPM LPM Manual Reset High LimitHigh Limit Switch Safety Flow Switch Thermal BalancerSafety Relief Valves Tank Temperature Control Required Ability GeneralThermometers Drain Valve Not SuppliedUnconfined Space Confined Space S. InstallationsCanadian Installations AIR RequirementsLeveling Installation ClearancesTypical Boiler Installation VentingVent Connection Vent Pipe InstallationConnecting Boiler to a Common Vent Draft HoodVenting System Venting Sidewall Optional Power Vent SystemMultiple Vent Table Model HW-300 Boiler Combined Vent Sizing TablesONE Boiler Installed Independent of the Primary System System InstallationsConventional Installations LINEAR-TEMP InstallationsMinimum Branch Sizes to Boilers NO. Suggested Items for InstallationSchematic of the LINEAR-TEMPSYSTEM Boiler Inlet Outlet SizesGAS Connections Correct GAS Purging and SizingModel Rated Manifold Pressure Number Input Natural Propane ExampleSpecific Multiplier Gravity GAS Pressure RegulatorsWiring Connections WiringHW 300 thru 670. Natural and Propane GAS U.S. & Canada HW 300 toD. System Single Stage I.I.D. Honeywell GAS ValveLINEAR-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 USE this Table for Correct Pump and Water Pipe Size Wiring Figures 16 and 17 on Pages 24Piping Commercial Boiler with Vertical TankCommercial 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 Main Burner Operation and START-UP InstructionsFilling the System Pilot and 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 Internal Contaminants Cleaning and Flushing InstructionsPRE-TROUBLESHOOTING HOT Water Supply Boilers Preventive MaintenanceCER-TEMP 80 Recovery System Checkout Procedure TroubleshootingYES 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 GreenNo Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty
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