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3. Electrical Requirements
No independent external power source or supply connection is necessary. The 24 volt power to operate
the fire suppression system (F.S.S.) is accomplished internally in the dryer (from the dryer controls).
WARNING: ELECTRICAL POWER MUST BE PROVIDED TO THE DRYER AT ALL TIMES.
If the main electrical power supply to the dryer is disconnected, the F.S.S. is
INOPERATIVE!!
Fire Suppression System (FSS) Theory of Operation
20-seconds after the heat turns off, the Phase 7 control monitors the FSS probe located in the top of the
basket (tumbler) chamber and records the minimum temperature. If the minimum recorded temperature is no
less than 120° F (48° C) and the control detects a 35° rise in temperature, this will be the trip point and the
FSS routine will activate.
While a drying cycle is in process and the heat is on, the Phase 7 control monitors the exhaust temperature
transducer. If the drying cycle temperature set point is set greater than 160° F (71° C) and the control detects
an exhaust temperature rise 25° F (-3.8° C) greater than set point, this will be the trip point and the FSS routine
will activate.
Once the FSS routine is activated, water will be injected into the basket (tumbler) chamber. Anytime
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 3 minutes. After 3 minutes has elapsed, the
control will check if the temperature remained above trip point, if so water will remain on. The control will
continue to check if 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. If the temperature has dropped below
trip point, the control will turn off the water prior to 10 minutes.
SYSTEM RESET
After the microprocessor determines that the situation is under control and shuts the water being injected into the
basket (tumbler) off, the microprocessor display will read “FIRE SUPPRESSION SYSTEM ACTIVATED,”
and the horn/tone will sound until reset manually.
To reset the microprocessor and F.S.S., press the red key on the keyboard (touch pad).