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500 Tennessee Waltz Parkway
Ashland City, TN 37015
GAS-FIRED COPPER BOILERS FOR
HYDRONIC HEATING AND HOT WATER SUPPLY
• Operation
• Maintenance
• Limited Warranty
WARNING: If the information in this
manual is not followed exactly, a fire or
explosion may result causing property
damage, personal injury or loss of life.
— 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 and service must be
performed by a qualified installer,
service agency or the gas supplier.
PRINTED 0810
USER'S MANUAL
MODELS:
VB/VW 1500, 2000
SERIES 100/101
500 Tennessee Waltz Parkway
Ashland City, TN 37015
www.hotwater.com
1
319432-000
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Table of Contents
Troubleshooting
Related Manuals for A.O. Smith VB 1500
Summary of Contents for A.O. Smith VB 1500
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Page 1: Limited Warranty
500 Tennessee Waltz Parkway Ashland City, TN 37015 USER’S MANUAL GAS-FIRED COPPER BOILERS FOR HYDRONIC HEATING AND HOT WATER SUPPLY MODELS: • Operation VB/VW 1500, 2000 • Maintenance SERIES 100/101 • Limited Warranty WARNING: If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. -
Page 2: Table Of Contents
TABLE OF CONTENTS TABLE OF CONTENTS ...............2 Setting of the Test Mode ..............13 SAFE INSTALLATION, USE, AND SERVICE ........3 Control System ................13 APPROVALS ..................3 Inputs to MCB ................14 GENERAL SAFETY................4 Operating Sequence ..............15-16 INTRODUCTION ................. 5 Operating Setpoint Adjustment Procedure .......17-18 INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF TROUBLESHOOTING IGNITION SYSTEM ........ -
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 Breathing Hazard - Carbon Monoxide Gas Special consideration must be taken with installation above 4500 feet. Please contact an A. O. Smith qualified service agent to obtain the proper setup and instructions before lighting. Failure to implement the proper setup will result in improper and inefficient operation of the appliance resulting in production of increased levels of carbon monoxide gas... -
Page 5: Introduction
INTRODUCTION this manual and the local code authority having jurisdiction. This design complies with the current edition of the ANSI These should be carefully followed in all cases. Authorities Z21.13 - CSA 4.9 Standard for Gas Fired Low Pressure Steam having jurisdiction should be consulted before installation and Hot Water Boilers. -
Page 6: Installation Requirements For The Commonwealth Of Massachusetts
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements should be satisfied: INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall horizontal vented gas fueled... -
Page 7: Schematic Diagram
VB/VW 1500/2000 SCHEMATIC DIAGRAM NEUTRAL 120VAC 120VAC RTN POWER POWER RELAY ON/OFF SWITCH CIRCULATING PUMP RELAY COIL CONTACTS (VW UNITS ONLY) PUMP RELAY CONTACTS 20 AMP FUSE (PDB – F2) K8 (MCB-II) PUMP RELAY COIL 10 AMP FUSE (PDB – F6) K11 (MCB-II) IGNITER GAS VALVE... -
Page 8: Flow Switch
CIRCUIT BOARD JUMPERS CIRCUIT BOARD JUMPERS VB/VW 1500/2000 W VB/VW 1500/2000 MCB-II – JP1 (not used), JP2 (used – 2.7A igniter), MCB-II – JP1 (not used), JP2 (used – 2.7A igniter), JP3 & JP4 (used – removed for hipot test). JP3 &... -
Page 9: Wiring Diagram
0 WIRING DIAGRAM WIRING DIAGRAM LEGEND LEGEND 120VAC WIRING 120VAC WIRING LOW VOLTAGE WIRING LOW VOLTAGE WIRING CAT-5 COMM CABLE CAT-5 COMM CABLE RANSFORMER TRANSFORMER AVAILABLE OPTION AVAILABLE OPTION 120/24 VAC 120/24 VAC 24VAC 24VAC USER INTERFACE MODULE USER INTERFACE MODULE NOTE1: IF ANY OF THE ORIGINAL WIRE AS SUPPLIED NOTE1: IF ANY OF THE ORIGINAL WIRE AS SUPPLIED CAT-5 CABLE... -
Page 10: Operation
OPERATION IMPORTANT Only a Certified Start-up agent should perform the initial firing of the boiler. At this time the user should not hesitate to ask the start-up technician any questions regarding the operation and maintenance of the unit. If you still have questions, please contact the factory or your local A.O. -
Page 11: Water Temperature Regulation
TABLE 1. GAS AND ELECTRICAL CHARACTERISTICS Manifold Pressure Maximum Supply Pressure Minimum Supply Pressure Models Type of Gas Inches W.C. Inches W.C. Inches W.C. VB/VW-1500,2000 Natural -.2 to - 4.9 -.04 to - 1.22 14.0 3.49 VB/VW-1500,2000 Propane -.2 to - 4.9 -.04 to - 1.22 14.0 3.49... -
Page 12: Lighting And Operating Instructions
LIGHTING AND OPERATING INSTRUCTIONS... -
Page 13: Adjustment
ADJUSTMENT LOW FIRE SETTING NATURAL GAS 7.5 - 9.5% CO PROPANE 9.5 - 12.0% CO Set boiler to the “Test Mode Low,” as described above, to achieve minimum firing rate of the boiler. Check combustion readings using a combustion analyzer. If combustion readings are not in accordance with the chart shown above adjust as follows: remove the cap on the gas regulator using a slotted screwdriver. -
Page 14: Inputs To Mcb
INPUTS TO MCB FLAME SENSOR: Flame (MCB - required): Returns a signal to the microprocessor TEMPERATURE SENSORS: when flame is detected on the burner. If the flame rod is missing Temperature probes (MCB - outlet and either inlet or tank are or shorted, the flame will not be detected. required): The MCB accepts analog temperature inputs from OUTPUTS FROM MCB up to three sensors (inlet, outlet, and tank). RELAY CONTACT OUTPUT: Manual Reset High Limit (MCB - required): The MRHL or manual Alarm (MCB - 24VAC - optional): Provides electrical power to... -
Page 15: Operating Sequence
MCB - Three position Dipswitch SW2: This dipswitch is similar to the FCB dipswitches described below, but with only three switches being used: the number of blower speeds (switch #3), Hi Gas option (switch #2) and a spare (switch #1). Only the blower speed and Hi Gas options are the required selection, within the MCB, see Figure 2. Dipswitch Function Dipswitch Position SW2 P1: Spare: NOT USED NOT USED... - Page 16 • Temperature Screen: selected post-circulate time to cycle the hot water out of the Displays the sensed temperatures of the Outlet, Inlet, and boiler. The FCB is commanded to shut down and the Alarm Tank probes. Also displayed is the calculated Delta T (Outlet output is turned on.
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Page 17: Operating Setpoint Adjustment Procedure
2. Scroll the “>” with the DOWN key next to USER SETTING SCREEN. this state until the MCB sends a command to clear the error, and the system returns to the idle state. 3. Press the SELECT key. 4. Scroll the “>” with the DOWN key until it is pointing to HIGH • Cold Purge State Cold purge occurs when the MCB micro commands the LIMIT SETPOINT. - Page 18 The software revision level of the MCB. From the Current Error Screen this key is used to reset the • Current Error Screen: system from an error: Displays the last error that the system has detected plus • Up and Down Keys: a time stamp of when the error occurred. (The time stamp These keys are used to move upwards and downwards in is based on the elapsed hours value at the time the error occurred.
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Page 19: Troubleshooting Ignition System
TROUBLESHOOTING IGNITION SYSTEM Fault Messages and Lockout Status (* = stage number: 1, 2, 3, or 4) FAULT DISPLAYED DESCRIPTION RED LED LOCKOUT “Display Fail” Communications with UIM interrupted Continuous Auto Reset Check communication cable to UIM. Try moving to other Internal Communications connector on MCB. Also check the connectors where the cable is plugged in for best connecting wires. “Blocked Intake”... -
Page 20: Troubleshooting Gas Valve
Problem: Gas OK, no burner start up (both shutoff valves are TROUBLESHOOTING GAS VALVE open, fan turns) There is not enough gas to accommodate a start up. Turn throttle Problem: Non-linear CO curve on adjusted boiler (deviation screw ½ turn counterclockwise and try to start again with more more than 3-6%) gas. -
Page 21: Relief Valve
in higher that normal operating temperatures and possible shortened service life. BURNER MAINTENANCE Qualified servicers should follow this procedure when the boiler’s burner needs cleaning. 1. Turn off the electrical power to the boiler and close the main manual gas shutoff valve(s). Allow the boiler parts to cool before disassembly. -
Page 22: Venting Maintenance
HEAT EXCHANGER PREVENTIVE lines with air or water and clear or replace the blocked portions of the line as necessary. Note that areas of the drain line which MAINTENANCE include a sag or low spot in the line will also form a condensate trap In most water supply systems solids exist. -
Page 23: 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. This term is reduced to FIVE years if this boiler is used for water heating purposes other than hydronic space heating. - Page 24 500 Tennessee Waltz Parkway, Ashland City, TN 37015 Technical Support: 800-527-1953 • Parts: 800-433-2545 • Fax: 800-644-9306 www.hotwater.com...