Question

I have a split type A/C which uses R32 as refrigerant. There was a loss of refrigerant in the system and I need to replace it. Due to the unavailabilty of R32 in my country, can I use R410a instead?

Answer 1

A furnace blower (squirrel cage fan) emitting a burnt smell after a short time running could be indicative of various issues. Some common problems that may cause this smell include:

1. Accumulated Dust and Debris: Over time, dust, dirt, and other debris can accumulate on the blower motor and its components. When the furnace is turned on, the heat can cause this accumulated material to burn, resulting in a burnt odor.

2. Worn Bearings: The blower motor's bearings may wear out due to regular use or lack of proper maintenance. If the bearings are worn, the motor may overheat, leading to a burnt smell.

3. Overheating Motor: If the blower motor is running at a higher temperature than normal, it can produce a burning odor. This could be due to various reasons, including motor issues, blocked vents, or a malfunctioning limit switch.

4. Electrical Issues: Faulty or damaged electrical components can cause overheating in the motor or wiring, leading to a burnt smell. This may include issues with the capacitor, relay, or other electrical connections.

5. Belt Problems: If your blower motor is belt-driven, a loose or damaged belt can slip or rub against other components, generating a burning smell.

6. Motor Windings: Damage or degradation of the blower motor windings can cause excessive heat buildup and produce a burnt odor.

7. Improper Lubrication: If the blower motor requires lubrication, a lack of proper maintenance can lead to increased friction and overheating, resulting in a burnt smell.

8. Blocked Air Filters: Clogged or dirty air filters can restrict airflow, causing the blower motor to work harder and potentially overheat.

If you notice a burnt smell coming from your furnace blower, it is essential to address the issue promptly to avoid potential damage to the motor or other components. In such cases, it is advisable to turn off the furnace and contact a qualified HVAC technician to inspect and diagnose the problem accurately. Regular maintenance and timely repairs can help prevent these issues and ensure your furnace operates safely and efficiently.