American Dryer Corp. AD/ML-310 - Manual (Page 53)

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Theory of Operation
20-seconds after the heat turns off, the Phase 7 microprocessor controller (computer) monitors the suppression system
probe located in the top of the basket (tumbler) chamber and records the minimum temperature. If the minimum
recorded temperature is no less than 120° F (48° C) and the microprocessor controller (computer) detects a 35° 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 is on, the Phase 7 microprocessor controller (computer) monitors the
exhaust temperature transducer. If the drying cycle temperature set point is set greater than 160° F (71° C) and the
microprocessor controller (computer) detects an exhaust temperature rise 25° F greater than set point, this will be the
trip point and the suppression system routine will activate.
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 microprocessor
controller (computer) will check if the temperature remained above trip point, if so water will remain on. The
microprocessor controller (computer) 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 microprocessor controller (computer) will turn off the water prior to 10 minutes.
SYSTEM RESET
After the microprocessor controller (computer) determines that the situation is under control and shuts off the water
being injected into the basket (tumbler), the microprocessor controller (computer) display will read “...SUPPRESSION
SYSTEM ACTIVATED”, and the audio alert tone will sound until reset manually.
To reset the microprocessor controller (computer) and the suppression system, press the red “STOP/CLEAR” O key on
the keyboard (touch pad).
NON-COIN SUPPRESSION SYSTEM CHECK PROCEDURE
The operation of the water solenoid valve should 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).
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.
The suppression system water solenoid valve test can be performed by pressing the red “STOP/CLEAR” O key and the
A
key together. The water valve will open and water will be dispensed into basket (tumbler) area as long as both keys
are held.