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FIRE SUPPRESSION SYSTEM THEORY OF OPERATION
While the dryer is in an idle state, or 20-seconds after the heat turns off, the Phase 7 microprocessor controller
(computer) monitors the thermistor probe, located in the top of the basket (tumbler) chamber, and records the
minimum temperature. If the minimum recorded thermistor probe temperature is greater than 120° F (48° C)
and the microprocessor controller (computer) detects a 50° rise in temperature, this
will be the trip point and the
fire suppression system routine will activate.
While a drying cycle is in process and the heat has turned on at least once, the Phase 7 microprocessor controller
(computer) monitors the exhaust temperature transducer. If the drying cycle temperature set point is set greater
than 160° F (71° C) and the microprocessor controller (computer) detects an exhaust temperature rise 25° F
greater than set point, this
will be the trip point and the fire suppression system routine will activate. If set point
is below 160° F (71° C), the trip point will be 185° F (85° C).
Once the fire suppression system routine is activated, the microprocessor controller (computer) will display
“F.S.S. ACTIVATED” and water
will be injected into the basket (tumbler) chamber. Any time water is being
injected into the basket (tumbler), the basket (tumbler) drive will turn the load for 1-second every 15-seconds.
This process will continue for a minimum of 2 minutes. After the 2 minutes have elapsed, the microprocessor
controller (computer) will check if the temperature remained above trip point; if so, the water will remain on.
The microprocessor controller (computer) will continue to check if the temperature is above trip point every
30-seconds. If the water has been on for a constant 10 minutes, the water will be turned off, regardless of the
temperature, and the microprocessor controller (computer) will display “F.S.S. WAS ACTIVATED.” If the
temperature has dropped below trip point, the microprocessor controller (computer) will turn off the water prior
to 10 minutes.
SYSTEM RESET
After the microprocessor controller (computer) determines that the situation is under control and shuts the water
being injected into the basket (tumbler) off, the microprocessor controller (computer) display will read “F.S.S.
WAS ACTIVATED,” and the horn/tone will sound until reset manually.
To reset the microprocessor controller (computer) once the microprocessor controller (computer) displays “F.S.S.
WAS ACTIVATED,” press the red “STOP/CLEAR” key on the keypad.