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D. SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) 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
S.A.F.E. system probe located in the top of the tumbler chamber and records the minimum temperature.
If the minimum recorded S.A.F.E. 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 S.A.F.E. 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 S.A.F.E. system routine will activate. If set point is below 160° F (71° C) the trip point will
be 185° F (85° C).
Once the S.A.F.E. system routine is activated, water will be injected into the tumbler chamber. Anytime
water is being injected into the tumbler; the 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 tumbler off, the microprocessor display will read “S.A.F.E. System activated”, and the horn/tone
will sound until reset manually.
To reset the microprocessor once the control displays “S.A.F.E. System activated”, press the red key on
the keypad.
NON-COIN S.A.F.E. 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 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.