How Flooding Affects Furnaces

2/11/2021 (Permalink)

A furnace flood in Mesa, AZ.

Many large commercial buildings have packaged rooftop units with a gas or electric boiler or a chiller with a boiler for space heating. Smaller structures that rely on conventional gas or electric furnaces can sustain serious damage from a furnace flood. Find out how to avoid the worst consequences of water damage after a pipe burst near a furnace in a building located in Mesa, AZ.

Increased Risk of Electrical Problems

A commercial building may have a gas or electric furnace. Furnaces powered by electricity contain several components that could malfunction after being exposed to water:

• Contactor
  
• Heating element
  
• Sequencer
  
• Transformer
  
  

If any of these components malfunction on a flooded furnace, the unit could trip a fuse or even blow a breaker. It is important to shut off the power to a flooded electrical furnace unit to reduce fire risks.

Metal Components May Corrode
Corrosion on sensitive components such as the contactor in a furnace can cause a unit that runs on electrical power to cease to function. Corrosion is caused by a chemical reaction between the salts that occur in water and any type of metal. Iron components corrode more quickly than stainless steel. Noble metals are less reactive and prone to corrosion.

Ductwork Can Become Contaminated
After a furnace flood, residue from a unit powered by gas or oil can travel through outflow ducting and contaminate a structure. Under the worst circumstances, a furnace blowback can spread soot throughout a building. It is a good idea to arrange for air duct cleaning after any commercial furnace or heating unit suffers water damage.
A furnace flood has the potential to undermine the function of this crucial appliance and the safety of a structure. Shutting off the furnace and the circuit for an appliance powered by electricity can help to limit safety risks at a commercial building in Mesa, AZ.