Three HW-520s, HW-610s or HW-670s UP-FLOW Model | A.O. Smith HW 610

THREE HW-520's, HW-610's OR HW-670's UP-FLOW MODEL

COMMERCIAL BOILER WITH VERTICAL TANK, CER-TEMP 80

WIRING - FIGURES 21 to 27 on

pages 28 to 32.

INSTALL IN ACCORDANCE

WITH ALL LOCAL CODES

DANGER

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE USE TEMPERATURE AT

FIXTURES. SEE TANK TEMPERATURE CONTROL WARNING ON PAGE 11. IF HIGHER

PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE BOOSTER

OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

IMPORTANT

THE INSTALLATION OF SAFETY FLOW SWITCH AS SHOWN IS REQUIRED

TO PROTECT THE BOILER IN CASE OF WATER SERVICE INTERRUPTION OR

CIRCULATOR FAILURE.

+PIPING AND FITTINGS BETWEEN GATE VALVES AND BOILERS SHOULD BE BRASS OR BRONZE. OTHER PIPING SHOULD CONFORM TO LOCAL CODES.

GATE VALVES ARE SHOWN FOR SERVICING BOILER. HOWEVER, LOCAL CODES

SHALL GOVERN THEIR USAGE.

*PRESSURE RELIEF VALVE RATING SHOULD NOT EXCEED PRESSURE CAPACITY OF ANY COMPONENT IN THE SYSTEM.

**INSTALL THERMOMETER AND PRESSURE RELIEF IN OPENINGS PROVIDED ON HW-520, HW-610 & HW-670.

USE THIS TABLE FOR CORRECT

PUMP AND WATER PIPE SIZE

	Minimum		B & G
Model	Pipe Size		B & G	*Armstrong
Number	(Inches)		Pump	Pump Size
			Size
	A	B	Size
	A	B
HW-520	2-1/2"	1-1/2"	2"	S-45 2-1/2"
HW-610/670	3"	1-1/2"	3" HD-3	S-46

*Assumes 50 equivalent feet of piping or less.

FIGURE 32.

37

Image 37

A.O. Smith HW 610 warranty Three HW-520s, HW-610s or HW-670s UP-FLOW Model

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 Introduction High Altitude InstallationsLIQUefied petroleum gas models Controls and Function High Limit Switch Safety Flow Switch Manual Reset High LimitThermal Balancer GPM LPM Safety Relief Valves Tank Temperature Control Thermometers GeneralDrain Valve Not Supplied Required Ability Canadian Installations Confined Space S. InstallationsAIR Requirements Unconfined Space Typical Boiler Installation Installation ClearancesVenting Leveling Connecting Boiler to a Common Vent Vent Pipe InstallationDraft Hood Vent Connection Multiple Vent Table Venting Sidewall Optional Power Vent SystemVenting System Model HW-300 Boiler Combined Vent Sizing Tables Conventional Installations System InstallationsLINEAR-TEMP Installations ONE Boiler Installed Independent of the Primary System Schematic of the LINEAR-TEMPSYSTEM NO. Suggested Items for InstallationBoiler Inlet Outlet Sizes Minimum Branch Sizes to Boilers GAS Connections Correct GAS Purging and Sizing Specific Multiplier Gravity ExampleGAS Pressure Regulators Model Rated Manifold Pressure Number Input Natural Propane Wiring Connections Wiring D. System HW 300 toSingle Stage I.I.D. Honeywell GAS Valve HW 300 thru 670. Natural and Propane GAS U.S. & Canada 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 Piping Wiring Figures 16 and 17 on Pages 24Commercial Boiler with Vertical Tank USE this Table for Correct Pump and Water Pipe Size 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 Filling the System Operation and START-UP InstructionsPilot and Main Burner Main Burner Pilot 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 URN Pilo T Firing VA LVE Counterclockwise SET T HE Thermostat to Lowwest Setting Manual Reset High Limit Switch Continuity Test General MaintenanceRelief Valve PRE-TROUBLESHOOTING Cleaning and Flushing InstructionsHOT Water Supply Boilers Preventive Maintenance Internal Contaminants CER-TEMP 80 Recovery System Checkout Procedure Troubleshooting YES Is ceramic insulator surrounding the electrode in good Burner ignition problems?Condition not cracked or broken? Is there excessive draft conditions that may cause pilot MV & MV/PV? Replace pilot burner assembly Location of LEDs Flame LED Yellow LED Status and TroubleshootingStatus LED Green OFF No Call for Heat Not applicable None OFF Conditions and Exceptions Limited Warranty