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Braemar THM 632 & X PCB Circuit Control Board PCB Modulating (MCB) NG Ducted Heaters PN. 640365
SKU: 19949
$349.00
The Braemar THM 632 & X are natural gas ducted heaters, and the PCB Circuit Control Board (Modulating Control Board, MCB) with Part Number: 640365 is a critical component of the heating system. The PCB is responsible for managing various functions such as ignition, fan speed modulation, temperature regulation, and safety monitoring to ensure the heater operates efficiently and safely.
The PCB Modulating Control Board (PN: 640365) in the Braemar THM 632 & X natural gas ducted heaters controls and manages several essential functions:
Ignition Control:
The PCB sends a signal to the spark igniter to initiate the ignition process when the system is powered on. It ensures that the burner lights up when there is a heating demand.
Fan Speed Modulation:
The PCB modulates the speed of the fan based on the heating demand. This allows the system to adjust airflow for optimal comfort and energy efficiency.
Temperature Regulation:
The PCB works with the thermostat to regulate the temperature within the room. It ensures that the desired temperature is maintained by controlling the burner and fan operations.
Safety Monitoring:
The PCB continuously monitors critical components such as the flame sensor, temperature sensors, and pressure switches. If any fault is detected (e.g., flame failure, overheating), the PCB will shut down the system to prevent damage or unsafe conditions.
Error Codes & Diagnostics:
The PCB can display error codes to help identify specific problems such as ignition failures, flame sensor malfunctions, or fan motor issues. These error codes provide valuable information to troubleshoot and resolve the issues.
Screwdrivers (Phillips and flathead)
Multimeter (for electrical connection checks)
Replacement PCB (Part Number: 640365)
Labels or camera (for recording wire connections)
Turn Off Gas and Power:
Before beginning the replacement process, ensure that the gas supply and electricity to the heater are completely turned off to avoid any risk of shock or gas leaks.
Remove the Heater Access Panel:
Use a screwdriver to remove the access panel or cover from the heater. This will expose the internal components, including the PCB.
Locate the Existing PCB:
The PCB is typically located near the burner or the main control section of the heater. It may be secured by screws or clips.
Disconnect Wiring from the Old PCB:
Carefully label the wiring connections or take a photo of the wiring setup to ensure proper reconnection to the new PCB.
Disconnect all the wiring from the old PCB carefully.
Remove the Old PCB:
Unscrew or unclip the old PCB from its mounting and remove it gently 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 according to the labels or photos you created.
Double-Check Wiring:
Ensure that all wiring connections are secure, especially to critical components like the flame sensor, ignition system, fan motor, and temperature sensors.
Reassemble the Heater:
After the new PCB is installed and the wiring is connected, replace the access panel or cover and secure it with screws.
Turn On Gas and Power:
Once the heater is reassembled, turn on the gas supply and power to the unit. Check the system for proper operation.
Verify Heater Operation:
The heater should attempt to ignite and the fan should modulate based on the heating demand. Verify that no error codes appear and ensure the system is running correctly.
If the Braemar THM 632 & X heater is not operating as expected after replacing the PCB (PN: 640365), here are some common troubleshooting steps:
Possible Causes:
Incorrect wiring to the PCB.
Faulty spark igniter or flame sensor.
Solution:
Double-check the wiring to ensure all connections are correct.
Test the spark igniter to ensure it’s producing a spark for ignition.
Clean or replace the flame sensor if it’s not detecting the flame.
Possible Causes:
Error codes typically indicate problems like ignition failure, flame sensor issues, or fan malfunctions.
Solution:
Refer to the user manual for error code definitions. Troubleshoot the issue based on the specific error code.
If the error is related to the flame sensor, clean or replace the sensor.
If the error involves the fan, verify that the fan motor is functioning correctly and check for any wiring issues.
Possible Causes:
Faulty fan motor or incorrect fan speed control wiring.
Solution:
Verify that the fan motor is functioning properly.
Ensure the wiring for fan speed modulation is correct and that the PCB is controlling the fan speed as expected.
Possible Causes:
Temperature sensor malfunction or improper wiring.
Solution:
Inspect the temperature sensors to ensure they are functioning properly.
Make sure the fan is modulating its speed appropriately and there are no blockages or obstructions.
Proper maintenance will help ensure that your Braemar THM 632 & X heater continues to operate efficiently for years. Here are some essential maintenance tips:
Clean Flame Sensors: Periodically clean the flame sensors to prevent soot or dirt buildup, which could interfere with their ability to detect the flame.
Inspect the Spark Igniter: Ensure the spark igniter is working properly, producing a consistent spark when the system attempts to ignite.
Check the Fan: Regularly inspect the fan for dust or debris that could obstruct airflow. Clean the fan if necessary to ensure efficient operation.
Inspect Gas Connections: Check all gas connections for any leaks or signs of wear to prevent any safety issues.
| SKU | 19949 |
| Brand | Braemar |
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