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SUPPRESSION SYSTEM 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
suppression system probe located in the top of the basket (tumbler) chamber and records the minimum temperature.
If the minimum recorded suppression system 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 suppression system 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
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 suppression system 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 2 minutes. After 2 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 “Suppression System activated,” and the horn/tone
will sound until reset manually.
To reset the microprocessor once the control displays “Suppression System activated,” press the red “STOP”
key on the keypad.
NON-COIN SUPPRESSION SYSTEM CHECK PROCEDURE
The operation of the water solenoid valve can be tested to ensure that the water supply system and valve are
functional. Before attempting system check, be sure that ALL water supply shutoff valves to the dryer are in
the OPEN position, and the dryer must be in the “READY” mode where no cycle is loaded or in progress.
The procedure is as follows:
1. Press and hold the red “STOP” key (while in “READY” mode and no cycle in progress).
2. Press and hold the “A” key.
3. Water valve will open and water will be dispensed into basket (tumbler) area as long as both keys are held.
IMPORTANT: This is a test function only and the keys should be held and system activated for only
a second or so, otherwise water will accumulate in various places in the dryer.