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Braemar THM 623 & X PCB Circuit Control Board PCB Modulating (MCB) NG Ducted Heaters PN. 640365
SKU: 19948
$349.00
The Braemar THM 623 & X are natural gas ducted heaters, and the PCB Circuit Control Board (Modulating Control Board, MCB) with Part Number: 640365 is an integral component for controlling the system’s operation. This PCB is responsible for managing various essential functions, such as ignition, fan speed modulation, temperature regulation, and safety monitoring. The PCB (PN: 640365) helps ensure the heater runs safely, efficiently, and reliably.
The PCB Modulating Control Board (PN: 640365) in the Braemar THM 623 & X NG Ducted Heaters is responsible for several key functions in the heating system:
Ignition Control:
The PCB controls the ignition process, activating the spark igniter to start the burner when the system is powered on and heating demand is initiated.
Fan Speed Modulation:
The PCB modulates the speed of the fan based on the heating demand. This ensures the fan operates at the right speed to deliver adequate airflow and maintain temperature.
Temperature Regulation:
The PCB works alongside the thermostat to regulate the temperature in the room, turning the burner and fan on and off as needed to maintain the desired temperature.
Safety Monitoring:
The PCB continuously monitors critical safety components such as the flame sensor, temperature sensors, and pressure switches. If it detects any issues, like a flame failure or overheating, it will shut down the system to prevent potential damage or unsafe conditions.
Error Codes & Diagnostics:
The PCB can display error codes to help diagnose and troubleshoot specific problems, such as ignition failures, flame sensor problems, or fan motor malfunctions.
Screwdrivers (Phillips and flathead)
Multimeter (for electrical checks)
Replacement PCB (Part Number: 640365)
Labels or a camera (to record wire connections)
Turn Off Gas and Power:
Before working on the heater, ensure that the gas supply and electricity to the unit are completely turned off for safety.
Remove the Heater Access Panel:
Use a screwdriver to remove the access panel or cover from the unit. This will expose the internal components, including the PCB.
Locate the Existing PCB:
The PCB is typically located near the burner or main control section of the heater. It is secured by screws or clips.
Disconnect Wiring from the Old PCB:
Carefully label the wiring connections or take a photo before disconnecting the wires from the old PCB. This will help ensure proper reconnection to the new PCB.
Disconnect all the wires from the old PCB.
Remove the Old PCB:
Unscrew or unclip the old PCB from its mount and carefully remove it from the unit.
Install the New PCB (PN: 640365):
Place the new PCB in the same position as the old one and secure it with screws or clips.
Reconnect the wiring to the new PCB, using the labels or photos as a guide to ensure proper connections.
Double-Check Wiring:
Ensure that all wiring is securely connected, especially to critical components like the flame sensor, ignition system, fan motor, and temperature sensors.
Reassemble the Heater:
Once the new PCB is installed and all wiring is connected, replace the access panel or cover and secure it with screws.
Turn On Gas and Power:
After reassembling the heater, turn on the gas supply and power to the unit. Verify that the system operates properly.
Verify Heater Operation:
The heater should ignite and the fan should modulate based on heating demand. Check for any error codes and ensure that the system operates smoothly.
If the Braemar THM 623 & X heater does not function as expected after replacing the PCB (PN: 640365), here are some common issues and troubleshooting steps:
Possible Causes:
Incorrect wiring to the PCB.
Faulty spark igniter or flame sensor.
Solution:
Double-check the wiring connections to ensure they are correctly configured.
Test the spark igniter to ensure that it’s producing a spark.
Clean or replace the flame sensor if it’s not detecting the flame properly.
Possible Causes:
Error codes indicate specific issues, such as ignition failure, flame sensor errors, or fan issues.
Solution:
Refer to the user manual to identify the error code.
Troubleshoot the issue based on the code, which could involve checking the ignition system, flame sensor, or fan motor.
Possible Causes:
Faulty fan motor or incorrect fan speed wiring.
Solution:
Verify that the fan motor is working correctly.
Check the wiring for the fan speed modulation and ensure that the PCB is correctly adjusting the fan speed.
Possible Causes:
Temperature sensor malfunction or incorrect wiring.
Solution:
Inspect and test the temperature sensors to ensure they are functioning correctly.
Make sure the fan speed is being modulated as needed to prevent overheating.
To keep your Braemar THM 623 & X heater running efficiently and extend its lifespan, follow these maintenance tips:
Clean Flame Sensors: Clean the flame sensors periodically to prevent dirt or soot buildup that can cause detection issues.
Inspect the Spark Igniter: Ensure that the spark igniter is working correctly and producing a consistent spark when needed.
Check the Fan: Inspect the fan for dust and debris that could obstruct airflow. Clean the fan to ensure optimal performance.
Inspect Gas Connections: Regularly check the gas connections for leaks or signs of wear to ensure safety.
| SKU | 19948 |
| Brand | Braemar |
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