Aerco BMK 750 - User Manual

Other manuals for Aerco BMK 750

Installation And Startup Guide128 pages

Questions and Answers

A
Alicia AdamsDec 1, 2025
How to troubleshoot airflow fault during ignition in Aerco Boiler?
- C
  Catherine MontgomeryDec 1, 2025
  If your Aerco Boiler displays an airflow fault during ignition, check the combustion blower for excessive heat or high current drain that could trip thermal or current overload devices. Inspect the blower inlet, including the air filter at the air/fuel valve, for blockages. Remove and inspect the Blower Proof and Blocked Inlet switches for blockages, cleaning or replacing them as needed. Check the continuity of both switches; replace if readings are erratic or greater than zero ohms. Verify the inlet air temperature and measure voltage at the AUX input in the I/O Box, ensuring it matches Appendix C values. Check the wire connection from the I/O Box 0-10V signal to the Blower Motor and measure voltage at the I/O box 0-10V output. Confirm the Analog Out option on the C-More Configuration Men...
A
Amy RuizAug 25, 2025
What causes flame loss during ignition in an Aerco BMK 750?
- M
  Mark BushAug 25, 2025
  If your Aerco Boiler experiences flame loss during ignition, start by inspecting the Flame Detector for wear and replace if necessary. Then, close the internal gas valve and test the Spark Igniter outside the unit to check for a spark. If there's no spark, check for 120VAC at the primary side of the ignition transformer during the ignition cycle.
S
Steven ThompsonAug 25, 2025
What causes an airflow fault during run in my Aerco BMK 750?
- M
  Matthew PittsAug 26, 2025
  If your Aerco Boiler shows an airflow fault during run, check the combustion blower for signs of excessive heat or high current draw. Inspect the blower inlet and ductwork for blockages. Remove the air filter and Blocked Inlet switch, inspecting for blockages and cleaning or replacing as necessary. Verify that 24 VAC is present between each side of the Blocked Inlet switch and ground; replace the switch if not present on both sides. If the unit rumbles or runs rough, perform combustion calibration. Also, causes from 3 to 16 for 'AIRFLOW FAULT DURING IGNITION' may apply.
P
powerslauraAug 27, 2025
What does 'Interlock Open' mean on my Aerco BMK 750 Boiler?
- S
  Steven RichardsonAug 27, 2025
  If your Aerco Boiler displays an interlock open error, first check for a properly installed jumper across the interlock terminals in the I/O box. If there are two external wires on these terminals, check your Energy Management system to see if the unit is disabled. Temporarily install a jumper to see if the interlock circuit is functioning. Also, check that the proving switch for any device hooked to the interlock circuit is closing and that the device is operational.
M
Melissa DorseyAug 27, 2025
Why is my Aerco Boiler showing a high water temperature?
- R
  Ralph PattersonAug 27, 2025
  If your Aerco Boiler is showing a high water temperature, refer to the troubleshooting steps for 'HIGH WATER TEMPERATURE SWITCH OPEN'. Also, verify that the Temp HI Limit setting is appropriately configured.
D
Denise FrazierSep 15, 2025
What causes a line voltage out of phase error on an Aerco Boiler?
- T
  tsparksSep 15, 2025
  If your Aerco Boiler indicates that the line voltage is out of phase, check the hot and neutral wires in the AC Power Box to ensure they are not reversed. Also, check the transformer wiring in the AC Power Box against the power box transformer wiring diagram to ensure it is wired correctly.
J
Jill RogersSep 12, 2025
What to do if my Aerco BMK 750 Boiler shows a residual flame?
- D
  Dustin LewisSep 12, 2025
  If your Aerco Boiler indicates a residual flame, replace the Flame Detector. Also, check the open/close indicator window of the Safety Shut-Off Valve (SSOV) to ensure it's fully closed. If not, replace the valve and/or actuator. Close the 1” Gas Shut-Off Valve downstream of SSOV. Install a manometer or gauge at the leak detection port between the SSOV and Gas Shut Off Valve. If a gas pressure reading is observed, replace the SSOV Valve and/or Actuator.
C
Colleen LoganSep 13, 2025
What does 'Delayed Interlock Open' mean on my Aerco BMK 750 and how to fix it?
- A
  Amy WebsterSep 13, 2025
  If your Aerco Boiler shows a delayed interlock open, check to ensure the jumper is properly installed across the delayed interlock terminals in the I/O Box. If there are 2 external wires on these terminals, check to see if an end switch for a proving device (such as a pump, louver, etc.) is tied these interlocks. Ensure that the device and/or its end switch is functional. A jumper may be temporarily installed to test the interlock.
J
Justin NguyenSep 5, 2025
Why is my Aerco BMK 750 showing 'PRG SWTCH CLOSED DURING IGNITION'?
- R
  Ricardo CastilloSep 6, 2025
  If your Aerco Boiler shows 'PRG SWTCH CLOSED DURING IGNITION', start the unit and check if the Air/Fuel Valve rotates to the purge (open) position, then back to the ignition position (towards closed) during the ignition cycle. If the valve doesn't rotate back to the ignition position, check the Air/Fuel Valve calibration. If the Air/Fuel Valve does rotate to the ignition position, check the purge switch for continuity between the N.O. and COM terminals; ensure that the switch is wired correctly. If the switch is wired correctly, replace the switch. Check DS1 & DS2 LEDs on the Power Supply Board. If they are not steady ON, replace the Power Supply Board. Check “Heartbeat” LED DS1 and verify it is blinking ON & OFF every second. If not, replace the IGST Board.
C
Christy SolomonSep 3, 2025
How to troubleshoot low gas pressure on Aerco BMK 750 Boiler?
- H
  hdelgadoSep 3, 2025
  If your Aerco Boiler indicates low gas pressure, measure the gas pressure upstream of the SSOV Actuator(s) with the unit firing. For FM gas trains, ensure it is between 4.0” W.C. and 14” W.C. For IRI gas trains, ensure it is between 4.2" W.C. and 14” W.C. If the pressure is within range, measure gas pressure at the Low Gas Pressure switch. If it is greater than 2.6” W.C., measure continuity across the switch and replace if necessary.

Summary

User Manual

Safety Precautions

Warnings and Cautions

General safety warnings and cautions for installers and operators.

Emergency Shutdown Procedure

Instructions for emergency shutdown of the boiler.

Boiler Installation

Site Preparation

Requirements for preparing the installation site for the boiler.

Gas Supply Piping

Guidelines for designing and installing the gas supply piping.

AC Electrical Power Wiring

Instructions for connecting the AC electrical power wiring to the unit.

Field Control Wiring

Information on connecting field control wiring to the unit.

Boiler Operation

Control Panel Description

Description of the C-More Control Panel, its controls, and displays.

Control Panel Menus

Overview of the menu structure, passwords, and navigation.

Combustion Calibration Menu

Adjusts blower speed for optimal combustion efficiency and emissions.

Boiler Sequencing Technology (BST) Menu

Configuration, operation, and monitoring of the BST system.

Boiler Start Sequence

Steps involved in the boiler's start-up sequence.

Initial Unit Start-Up

Initial Start-Up Requirements

Key requirements before performing the initial start-up.

Tools for Combustion Calibration

Necessary tools and instrumentation for performing combustion calibration.

Natural Gas Combustion Calibration

Procedure for calibrating combustion for low and ultra-low NOx emissions.

Propane Combustion Calibration

Procedure for calibrating combustion for propane gas units.

Over-Temperature Limit Switches

Description and types of over-temperature limit switches.

Boiler Modes of Operation

Indoor;Outdoor Reset Mode

Operation based on outside air temperature for increased efficiency.

Constant Setpoint Mode

Operation with a fixed header temperature, no external sensors needed.

Remote Setpoint Modes

Remotely controlling the unit's setpoint via EMS or BAS.

Direct Drive Modes

AERCO Control System (ACS)

Combination Control System (CCS)

Safety Device Testing

Testing Safety Devices

Low Gas Pressure Fault Test

Simulating and testing the low gas pressure fault condition.

High Gas Pressure Test

Simulating and testing the high gas pressure fault condition.

Low Water Level Fault Test

Simulating and testing the low water level fault condition.

Water Temperature Fault Test

Simulating and testing high water temperature faults.

Interlock Tests

Flame Fault Tests

Air Flow Fault Tests

SSOV Proof of Closure Switch Test

Purge Switch Open During Purge Test

Ignition Switch Open During Ignition Test

Boiler Maintenance Schedule

Scheduled Maintenance Procedures

Igniter-Injector Replacement

Flame Detector Replacement

O2 Sensor Replacement

Boiler Troubleshooting Guide

RS-232 Communication

Boiler Sequencing Technology (BST)

AERCO BST Quick Start Chart

BST Implementation Instructions

Boiler Menu Item Descriptions

Startup, Status, and Display Messages

Fault Messages

Parts List Drawings

C-More Wiring Diagrams

Recommended Periodic Testing

Ultra-Low NOx Calibration

Summary

User Manual

Safety Precautions

Warnings and Cautions

General safety warnings and cautions for installers and operators.

Emergency Shutdown Procedure

Instructions for emergency shutdown of the boiler.

Boiler Installation

Site Preparation

Requirements for preparing the installation site for the boiler.

Gas Supply Piping

Guidelines for designing and installing the gas supply piping.

AC Electrical Power Wiring

Instructions for connecting the AC electrical power wiring to the unit.

Field Control Wiring

Information on connecting field control wiring to the unit.

Boiler Operation

Control Panel Description

Description of the C-More Control Panel, its controls, and displays.

Control Panel Menus

Overview of the menu structure, passwords, and navigation.

Combustion Calibration Menu

Adjusts blower speed for optimal combustion efficiency and emissions.

Boiler Sequencing Technology (BST) Menu

Configuration, operation, and monitoring of the BST system.

Boiler Start Sequence

Steps involved in the boiler's start-up sequence.

Initial Unit Start-Up

Initial Start-Up Requirements

Key requirements before performing the initial start-up.

Tools for Combustion Calibration

Necessary tools and instrumentation for performing combustion calibration.

Natural Gas Combustion Calibration

Procedure for calibrating combustion for low and ultra-low NOx emissions.

Propane Combustion Calibration

Procedure for calibrating combustion for propane gas units.

Over-Temperature Limit Switches

Description and types of over-temperature limit switches.

Boiler Modes of Operation

Indoor;Outdoor Reset Mode

Operation based on outside air temperature for increased efficiency.

Constant Setpoint Mode

Operation with a fixed header temperature, no external sensors needed.

Remote Setpoint Modes

Remotely controlling the unit's setpoint via EMS or BAS.

Direct Drive Modes

AERCO Control System (ACS)

Combination Control System (CCS)

Safety Device Testing

Testing Safety Devices

Low Gas Pressure Fault Test

Simulating and testing the low gas pressure fault condition.

High Gas Pressure Test

Simulating and testing the high gas pressure fault condition.

Low Water Level Fault Test

Simulating and testing the low water level fault condition.

Water Temperature Fault Test

Simulating and testing high water temperature faults.

Interlock Tests

Flame Fault Tests

Air Flow Fault Tests

SSOV Proof of Closure Switch Test

Purge Switch Open During Purge Test

Ignition Switch Open During Ignition Test

Boiler Maintenance Schedule

Scheduled Maintenance Procedures

Igniter-Injector Replacement

Flame Detector Replacement

O2 Sensor Replacement

Boiler Troubleshooting Guide

RS-232 Communication

Boiler Sequencing Technology (BST)

AERCO BST Quick Start Chart

BST Implementation Instructions

Boiler Menu Item Descriptions

Startup, Status, and Display Messages

Fault Messages

Parts List Drawings

C-More Wiring Diagrams

Recommended Periodic Testing

Ultra-Low NOx Calibration

Aerco BMK 750 Specifications

General

Brand	Aerco
Model	BMK 750
Category	Boiler
Language	English

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Aerco BMK 750 - User Manual

Table of Contents

Other manuals for Aerco BMK 750

Questions and Answers

Summary

User Manual

Safety Precautions

Warnings and Cautions

Emergency Shutdown Procedure

Boiler Installation

Site Preparation

Gas Supply Piping

AC Electrical Power Wiring

Field Control Wiring

Boiler Operation

Control Panel Description

Control Panel Menus

Combustion Calibration Menu

Boiler Sequencing Technology (BST) Menu

Boiler Start Sequence

Initial Unit Start-Up

Initial Start-Up Requirements

Tools for Combustion Calibration

Natural Gas Combustion Calibration

Propane Combustion Calibration

Over-Temperature Limit Switches

Boiler Modes of Operation

Indoor;Outdoor Reset Mode

Constant Setpoint Mode

Remote Setpoint Modes

Direct Drive Modes

AERCO Control System (ACS)

Combination Control System (CCS)

Safety Device Testing

Testing Safety Devices

Low Gas Pressure Fault Test

High Gas Pressure Test

Low Water Level Fault Test

Water Temperature Fault Test

Interlock Tests

Flame Fault Tests

Air Flow Fault Tests

SSOV Proof of Closure Switch Test

Purge Switch Open During Purge Test

Ignition Switch Open During Ignition Test

Boiler Maintenance Schedule

Scheduled Maintenance Procedures

Igniter-Injector Replacement

Flame Detector Replacement

O2 Sensor Replacement

Boiler Troubleshooting Guide

RS-232 Communication

Boiler Sequencing Technology (BST)

AERCO BST Quick Start Chart

BST Implementation Instructions

Boiler Menu Item Descriptions

Startup, Status, and Display Messages

Fault Messages

Parts List Drawings

C-More Wiring Diagrams

Recommended Periodic Testing

Ultra-Low NOx Calibration

Summary

User Manual

Safety Precautions

Warnings and Cautions

Emergency Shutdown Procedure

Boiler Installation

Site Preparation

Gas Supply Piping

AC Electrical Power Wiring

Field Control Wiring

Boiler Operation

Control Panel Description

Control Panel Menus

Combustion Calibration Menu

Boiler Sequencing Technology (BST) Menu

Boiler Start Sequence

Initial Unit Start-Up

Initial Start-Up Requirements