Backup Blower Setup
Tech Talk 3
Anyone who has worked with fish for a while knows that if you don't plan ahead, you won't be in business for long. When it comes to life support, a backup blower could save your business.
The most crucial of life support requirements is maintaining an adequate oxygen level because it can be used up so quickly.
We always recommend having a second blower attached to the main air supply line, wired to come on if the primary blower fails for any reason. Both blowers must have check valves on them. A pressure switch is located between the primary blower and its check valve. When this pressure switch senses a loss of air pressure, it closes, causing an electric relay to start the backup blower (see diagram). The check valves keep air from being lost through the nonrunning unit.
Check valves must be able to tolerate high temperatures. Be sure the stand-by unit is on a different electrical circuit breaker.