American Dryer Corp Troubleshooting Milnor Dryer Exhaust Probe Faults & S.A.F.E. System Resets

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. system 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 “Fire Suppression 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 “FSS was Activated.” If the temperature has dropped below trip point, the control will turn off the water prior to 10 minutes.

Disabled Sensor Activated Fire Extinguishing (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 ‘FSS DISABLED...” If the “PAUSE” and “LO” keys are simultaneously pressed, the control will display one of the following diagnostic messages indicating the fault with the system. If there is more than one issue with the S.A.F.E. system, the control will display one message at a time.

S.A.F.E. System Diagnostic Messages

Open FSS Probe Fault: This message indicates that the S.A.F.E. probe is either not connected or is damaged.

Shorted FSS Probe Fault: This message indicates that the S.A.F.E. probe is damaged or the wiring is shorted.

Open FSS Valve Fault: This indicates that the water valve is open or that it is not connected to the control.

Shorted FSS 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 “FSS Was Activated,” press and hold the “PAUSE” key for 3-seconds.

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