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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 basket (tumbler) chamber and records the minimum temperature.
If the minimum recorded S.A.F.E. probe temperature is greater 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, the control will display “S.A.F.E. System activated” and 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 and
the control will display “S.A.F.E. was Activated.” If the temperature has dropped below trip point, the control
will turn off the water prior to 10 minutes.
Disabled S.A.F.E. System
In the event that the S.A.F.E. system is not installed properly or if there is a malfunction in the system the Phase
7 coin control will notify the user by displaying the message “S.A.F.E. DISABLED...” If the “PAUSE” and
“LO” keys are simultaneously pressed, the control will display one (1) of the following diagnostic messages
indicating the fault with the system. If there is more than one (1) issue with the S.A.F.E. system, the control will
display one (1) message at a time.
S.A.F.E. Diagnostic Messages
Open S.A.F.E. Probe Fault: This message indicates that the fire suppression probe is either not connected or
is damaged.
Shorted S.A.F.E. Probe Fault: This message indicates that the fire suppression probe is damaged or the
wiring is shorted.
Open S.A.F.E. Valve Fault: This indicates that the water valve is open or that it is not connected to the
control.
Shorted S.A.F.E. Valve Fault: This indicates the water valve is shorted or the wiring to the valve is shorted.
Water Not Connected: This indicates that there is no water pressure at the water valve. This will occur if
water is not connected to dryer or if there is low water pressure in the water line coming to the dryer. This could
also be a defective pressure switch or wiring to the pressure switch.
SYSTEM RESET
To reset the microprocessor once the control displays “S.A.F.E. System activated,” press and hold the “PAUSE”
key for 3-seconds.