A.O. Smith HW 300 User Manual
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A.O. Smith HW 300 User Manual

Gas fired commercial copper boilers for hydronic heating and hot water supply up - flow models
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See also: Instruction Manual , Installation Operation & Maintenance
GAS FIRED COMMERCIAL COPPER BOILERS
25589, Highway 1
McBee, SC 29101
WARNING: If the information in these
instructions is not followed exactly, a fire
or explosion may result causing property
damage, personal injury or death.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do
not use any phone in your building.
•
Immediately call your gas supplier
from a neighbor's phone. Follow the
gas supplier's instructions.
•
If you cannot reach your gas supplier,
call the fire department.
Installation
performed by a
service agency or the gas supplier.
Thank you for buying this energy efficient boiler.
We appreciate your confidence in our products.
PRINTED IN THE U.S.A. 0212
H
and
service
must
qualified
installer,
be
User's Manual
300, 399, 420, 520, 670
FOR HYDRONIC HEATING AND
HOT WATER SUPPLY
UP - FLOW MODELS
OPERATION - MAINTENANCE -
LIMITED WARRANTY
MODELS: HW
321082-000

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Questions and answers

Gary Higgins
March 4, 2025

Boiler comes on and pilot lights and then the main burner lights and Ron’s about 20seconds and I hen goes out with no fault codes

0
1 comments:
Mr. Anderson
March 4, 2025

Possible causes for the A.O. Smith HW 300 boiler's main burner lighting for 20 seconds and then going out without any fault codes include:

1. Pilot Flame Failure – If the module does not sense the pilot flame current properly, the main valve will close, stopping the burner.
2. Flame Sensor Issue – If the flame sensor is dirty or not positioned correctly, it may not detect the flame, causing the system to shut off.
3. Protector Switch Activation – If the boiler temperature exceeds 200°F, the protector switch may open, shutting off the burner.
4. Power Interruption – If there is an unstable power supply, the system may shut off and restart when power is restored.
5. Thermostat Satisfied – If the thermostat detects that the desired temperature is reached, it will turn off the burners.

Checking the flame sensor, ensuring proper wiring, and verifying the protector switch and thermostat settings may help diagnose the issue.

This answer is automatically generated

0

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Summary of Contents for A.O. Smith HW 300

  • Page 1 User's Manual GAS FIRED COMMERCIAL COPPER BOILERS MODELS: HW 300, 399, 420, 520, 670 FOR HYDRONIC HEATING AND HOT WATER SUPPLY UP - FLOW MODELS 25589, Highway 1 McBee, SC 29101 OPERATION - MAINTENANCE - LIMITED WARRANTY WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS TABLE OF CONTENTS ................2 SAFE INSTALLATION, USE AND SERVICE.......... 3 GENERAL SAFETY................4 INTRODUCTION ..................5 Abbreviations used ................5 Qualifications ..................5 CONTROL COMPONENTS ..............6 BOILER START UP AND OPERATIONS ..........10 Filling the system ................10 Precautions ..................

  • Page 3: Safe Installation, Use And Service

    SAFE INSTALLATION, USE AND SERVICE The proper installation, use and servicing of this boiler is extremely important to your safety and the safety of others. Many safety-related messages and instructions have been provided in this manual and on your boiler to warn you and others of a potential injury hazard.

  • Page 4: General Safety

    GENERAL SAFETY...

  • Page 5: Introduction

    INTRODUCTION This design complies with the current edition of the ANSI Z21.13 QUALIFICATIONS low-pressure boiler standard. QUALIFIED INSTALLER OR SERVICE AGENCY Compliance under this standard implies that when the boiler Installation and service of this boiler requires ability equivalent underwent test, the gas manifold and control assembly pro vided to that of a Qualified Agency, as defined by ANSI below.

  • Page 6: Control Components

    CONTROL COMPONENTS FIGURE 1. COMPONENT LOCATIONS...
  • Page 7 THERMAL BALANCER AUTO RESET HIGH LIMIT Figure 4 shows the internal wiring of the thermal balancer. The The high limit is a safety device wired in series with the ignition device may be tested after disconnecting the four leads from system.
  • Page 8 PRESSURE RELIEF VALVE If any pressure relief valve is replaced, the replacement valve must comply with the current editions of the ASME Boiler and Pressure Vessel Code, Section IV or CSA B51, as applicable. An ASME rated pressure relief valve is furnished with the boiler. Select a pressure relief valve with a discharge NOT less than the A fitting for the pressure relief valve is provided in the top of the boiler input, and a pressure rating NOT exceeding the working...
  • Page 9 Use anti-scald valve(s) in the hot water system to reduce the TANK TEMPERATURE CONTROL risks of scalds at points of use such as lavatories, sinks and bathing facilities. The water temperature in the storage tank is controlled by the Tank Temperature Control. The sensing element is mounted A change in water temperature in the storage tank lower than the inside the hot water storage tank.

  • Page 10: Boiler Start Up And Operations

    BOILER START UP AND OPERATIONS PILOT AND MAIN BURNER After placing the boiler into operation, the ignition system safety shutoff device must be tested by the following test method. To maintain safe operation of the boiler, check the pilot and Reset High Limit Temperature Control to lowest setting.
  • Page 11 2. PILOT BURNER - ELECTRONIC IGNITION Check for electrical power to the valve. If electrical power and gas are present at the valve and the pilot does not operate when To establish pilot flame without main burner operation, it will be system calls for heat, replace valve.

  • Page 12: Checking And Adjusting Input

    CHECKING AND ADJUSTING INPUT Repeat steps 1 thru 6 of the OPERATING INSTRUCTIONS. Remove the pressure gauge or manometer from the manifold pressure tapping. Replace the screw-in plug in the manifold pressure tap. Fire and Explosion Hazard Repeat steps 7 thru 11 of the OPERATING INSTRUCTIONS on Page 15.
  • Page 13 START THERMOSTAT (CONTROLLER) CALLS FOR HEAT STAGE 1 SPARK GENERATOR POWERED TRIAL FOR First valve (pilot) operator opens IGNITION PILOT BURNER OPERATION Pilot burner lights. Pilot burner does not light Module senses Module Response flame current. S-8600M After 15 sec. ignition shut-down.
  • Page 14 LIGHTING AND OPERATING INSTRUCTIONS (NATURAL AND PROPANE FOR HW300 - HW399...
  • Page 15 LIGHTING AND OPERATING INSTRUCTIONS (NATURAL AND PROPANE WITH I.I.D. FOR HW420 & UP)

  • Page 16: Troubleshooting

    TROUBLESHOOTING Before any extensive troubleshooting, perform the following: • Voltage (24 vac) is supplied by transformer. • Boiler is wired according to wiring diagram. Ensure that: Note: Cross wiring the 24 volt circuit of the relay will short the • Voltage (120 vac) is supplied to the boiler. transformer.
  • Page 17 CHECKING HONEYWELL S-8600H OR S-8600M INTERMITTENT IGNITION CONTROLS NO SPARK AT PILOT BURNER Turn off gas supply. Is voltage (24 Vac) across the 24 V terminals Replace ignition module. on module during “Call for heat”? Is voltage (24 Vac) across the PV & MV/PV terminals on “call for heat”? NOTE: S-8600M will automatically reset every 5 minutes.
  • Page 18 CHECKING HONEYWELL S-8600H OR S-8600M INTERMITTENT IGNITION CONTROLS SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT Ensure all manual shutoff valves are fully open; all filters are clean; all gas connections are gas tight; pilot tubing is not damaged, obstructed or kinked;...
  • Page 19 CHECKING HONEYWELL S-8600H OR S-8600M INTERMITTENT IGNITION CONTROLS PILOT BURNER LIGHTS BUT MAIN BURNER DOES NOT LIGHT Correct the situation by consulting the Does the pilot flame cover 3/8” to 1/2” installation or user’s manual on how to of igniter/sensor rod? adjust pilot flame.
  • Page 20 CHECKING HONEYWELL S8600H OR S-8600M INTERMITTENT IGNITION CONTROLS NO SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT Turn off gas supply. Fix connection and/or Is there a good connection between terminals? tighten module to the Is module securely attached to boiler for good ground boiler.
  • Page 21 TABLE 4. YELLOW LED FLAME CODES The following procedures are provided as a general guide. Any module should be replaced if it does not perform properly on YELLOW LED RECOMMENDED INDICATES checkout or troubleshooting. FLASH CODE SERVICE ACTION In addition, replace any module if it is wet or looks like it has ever Heartbeat Normal Flame Signal not applicable...
  • Page 22 TABLE 5. CONTINUOUS RETRY MODELS C, M, E AND K ONLY - GREEN LED STATUS CODES GREEN LED RECOMMENDED SERVICE FLASH CODE INDICATES NEXT SYSTEM ACTION ACTION (X+Y) No "Call for Heat" not applicable none Flash Fast Startup - Flame sense calibration not applicable none Heartbeat...
  • Page 23 TABLE 6. LOCKOUT MODELS B, H, D AND J ONLY - GREEN LED STATUS CODES GREEN LED RECOMMENDED SERVICE FLASH CODE INDICATES NEXT SYSTEM ACTION ACTION (X+Y) No "Call for Heat" not applicable none Flash Fast Startup - Flame sense calibration not applicable none Heartbeat...

  • Page 24: Maintenance Procedures

    MAINTENANCE PROCEDURES These boilers are designed to give many years of efficient and satisfactory service when properly operated and maintained. assure continued good performance, following recommendations are made. The area around the boiler should be kept clean and free from lint and debris.

  • Page 25: Venting Maintenance

    VENTING MAINTENANCE It is recommended that the heating surfaces and vent piping of the boiler be checked every six months for dust, deterioration and carbon deposits. Remove all soot or other obstructions from chimney and flue which will retard free draft. Replace any damaged or deteriorated parts of the venting system.

  • Page 26: Notes

    NOTES...

  • Page 27: Limited Warranty

    LIMITED WARRANTY A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this boiler: 1. If within TEN years after initial installation of the boiler, a heat exchanger or gas burner should prove upon examination by the warrantor to be defective in material or workmanship, the warrantor, at his option will exchange or repair such part or portion.
  • Page 28 25589 Highway 1, McBee, SC 29101 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.com...

This manual is also suitable for:

Hw 399Hw 420Hw 520Hw 670

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