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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 (FSS) 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 FSS is INOPERATIVE!!
Fire Suppression System (FSS) Theory of Operation
While the dryer is in an idle state or 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 FSS probe temperature is no less than 120°F (48°C) and the control detects a 50° 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 has turned on at least once, 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 greater than set point, this will be the trip point and the FSS
routine will activate. If set point is below 160°F (71°C) the trip point will be 185°F (85°C).
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 WAS
ACTIVATED,” and the horn/tone will sound until reset manually.
To reset the microprocessor once the control displays “FIRE SUPPRESSION SYSTEM WAS ACTIVATED,”
press the red key on the keyboard (touch pad).