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General| Brand | A.O. Smith |
|---|---|
| Model | VF VB 1000 |
| Category | Boiler |
| Language | English |
General advice on performing component inspection and ensuring proper connection.
Required skills and expertise for servicing A. O. Smith VF boilers.
Caution against performing tasks without appropriate license or confidence.
Lists necessary tools and test equipment for boiler service and troubleshooting.
Details key features of the EMC 5000 control system, including diagnostics and protection.
Describes UIM components: LEDs, LCD display, touch-sensitive buttons, and memory.
Explains the function of the red, yellow, and green status LEDs on the UIM.
Describes the LED indicator for the boiler's current firing rate.
Details the operational purpose of the Select, Menu, Help, Up, and Down buttons.
Illustrates the step-by-step process to modify the boiler's operating set point.
Details the purpose and content of each available menu screen on the UIM.
Explains screens for system information, current errors, error history, and default settings.
Describes how the Variable Frequency Drive (VFD) controls the blower speed for modulation.
Explains how the Venturi mixes gas and air for combustion based on blower speed.
Explains how the Hall Effect sensor measures blower motor speed (RPM).
Details how the Config Key stores and provides blower speed programming data.
Visualizes the sequence of events during a boiler heating cycle.
Continues the visual representation of the boiler's operational steps.
Pre-startup checks, tools required, and initial settings.
Setting firing modes (Min, Max, Mod) for startup and combustion checks.
Procedures for safely shutting down the boiler to prevent damage.
Detailed instructions for initiating boiler operation and performing checks.
Procedure for setting manifold gas pressure for optimal combustion.
Adjusting manifold gas and checking CO2 levels for high and low fire.
Importance of proper venting and adequate combustion air for performance.
Inspects the burner and verifies modulation performance with VFD.
Approximate MCB/VFD parameters for natural and propane gas models.
Procedure for measuring negative manifold gas pressure at various firing rates.
Explanation of High and Low Blower Prover Switches and their operation.
Explains MCB, CCB, FCB terms and the MCB's role as the main controller.
Describes MCB orientation and the division into sections for reference.
Identifies Red LED, F1 Fuse, and J3 Socket in MCB Section A.
Details MCB Section B sockets: J4 (Outputs), J11 (Tstat), J5 (Inputs), J17, J19.
Details MCB Section C sockets: J2, J15, J1, J18, and associated jumpers/fuses.
Configuration settings via SW1 dip switches for boiler application and stages.
Details MCB Section E sockets: J6 (Gas Pwr), J7 (Outlet Prb), J8 (Inlet Prb), J9 (Tank Prb).
Describes ICSP port, External/Internal Comm Ports, and JP1 jumper.
Explains the settings for SW2 dip switch, including spare and blower speed options.
Details connections for Config Key (J23), VFD, and Hall Effect Sensor (J24) on Daughter Board.
Shows the division of the PDB into sections for detailed explanation.
Details connections for 120 VAC power supply, pump relay, and pump motor.
Lists fuses F1 through F7 and their respective applications on the PDB.
Details connections for 24 VAC outputs (J2) and the transformer (J1).
Details 120 VAC outputs (J3) and the power test jumper (JP1).
Instructions and LED status table for testing the PDB power supply.
Using System Status menu, pre-service checks, and resetting the control.
Conditions and checks for a blank UIM display, including power and wiring.
Explains errors related to UIM communication and missing Config Key.
Explains errors related to Config Key data integrity and defect.
Addresses errors for low voltage, low water cutoff, and low gas pressure.
Checks for pump operation, relay, and fuse issues for 'No Flow' error.
Checks for flow switch condition, water flow rate, and bypass line.
Explains errors related to VFD wiring, Hall Effect sensor, and speed readings.
Checks for BPS, VFD enable/disable circuit, and wiring for blower start issues.
Continues checks for blower motor, housing, and thermal overload issues.
Checks BPS contacts, motor wiring, and gas valve energization for starting issues.
Checks BPS connections, motor wiring, and gas train shut-off valve.
Tests the High Blower Prover Switch contacts for proper operation during cycles.
Tests manifold gas pressure to diagnose BPS fault condition.
Checks pressure switch, wiring, and exhaust vent restrictions.
Further checks on blocked flue switch and pressure readings.
Checks gas supply, burner view, flame sensor wiring, and connections.
Performs flame sensing tests and checks gas valve operation.
Checks igniter current draw and gas valve energization during ignition.
Checks igniter wiring, socket connections, and 120 VAC supply.
Explains system control logic and the function of the enable/disable circuit.
Details probe types, configuration, and requirements for Tank/Loop probe.
Explains how the Operating Set Point and Stage 1 Differential affect heating cycles.
Details the Automatic High Limit set point and differential settings.
Explains how external controls use the enable/disable circuit for boiler operation.
Discusses Aquastats, EMS, Outdoor Air Reset, and Boiler Sequencing Controllers.
Specifies desired temperature rise (20-40°F) and minimum inlet water temp (120°F).
Explains the need and function of bypass lines for maintaining inlet water temperature.
Details voltage, circuit protection, sensor accuracy, and wiring requirements.
Lists specifications for pressure switches, flow switch, blower, gas valve, and pump.
Lists ignition timing parameters and default user settings for VW and VB models.
Explains key terms and abbreviations used throughout the manual.
Provides further definitions for terms like UIM, VFD, and Water Flow Switch.
