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28 American Dryer Corp. 113237-4
Electrical Requirements
No independent external power source or supply connection
is necessary. The 24 volt power to operate the S.A.F.E. system
is accomplished internally in the dryer (from the dryer controls).
Warning
Electrical power must be provided to the dryer at
all times. If the main electrical power supply to the
dryer is disconnected, the S.A.F.E. system is inoperative!!
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 thermistor probe,
located in the top of the tumbler chamber, and records the
minimum temperature. If the minimum recorded thermistor
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 tumbler chamber. Any time 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 the 2 minutes have elapsed, the control
will check if the temperature remained above trip point; if so,
the water will remain on. The control will continue to check if
the 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. System Was Activated”. 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 Was
Activated”, and the horn/tone will sound until reset manually.
Non-Coin – To reset the microprocessor once the control
displays “S.A.F.E. System Was Activated”, press the red “Stop/
Clear” key on the keypad.
Coin – To reset the microprocessor once the control displays
“S.A.F.E. System Was Activated”, press and hold the red
“Pause” key for 3-seconds on the keypad.
S.A.F.E. System Water Valve Check
The operation of the water solenoid valve can be tested to
ensure that the water supply system and valve are functional.
Before attempting a system check, be sure that all water supply
shutoff valves to the dryer are in the open position; the dryer
must be in the “Ready” mode with no cycle loaded or in
progress.
Non-Coin
Press and hold the red “Stop/Clear” key (while in “Ready” mode
and no cycle is in progress).
Press and hold the “A” key.
Water valve will open and water will be dispensed into tumbler
area as long as both keys are held.
The Phase 7 non-coin microprocessor controller (computer)
will prompt the user to perform a S.A.F.E. system valve check
at every 4000 hours to ensure proper functionality. At the
4000 hour mark, the control will wait for end of the cycle and
then will prompt the user to “Please Empty Tumbler, Then
Press the ‘Stop/Clear’ and ‘A’ Keys to Test the Water Valve”.
When the “Stop/Clear” and “A” keys are pressed, the control
will activate the S.A.F.E. system water valve for 2-seconds, at
which point the control will prompt the user with the following
message: “If Water Did Not Turn On, Call for Service. Thank
You.”.
Note
The control will not let the user continue until the
valve test has been completed.
Coin
While the control is in the program mode, press and hold the
“Pause” key for 3-seconds to get into the valve test mode.
Valve test mode: The control will display “Press and Hold
Medium to Open Water Valve”. When the “Medium” key is
pressed, the control will activate the water output.
S.A.F.E. System Diagnostics
Non-Coin – In the event that the Phase 7 non-coin
microprocessor controller (computer) detects a fault in the
S.A.F.E. system, the control will display the message “S.A.F.E.
System Disabled…Ready”. To find out why the S.A.F.E.
system is disabling, press and hold the red “Stop/Clear” and
green “Start” keys. This will cause the control to display a
diagnostic message, as detailed in the “S.A.F.E. System
Diagnostics Messages” section.
Coin – In the event that the Phase 7 microprocessor controller
(computer) detects a fault in the S.A.F.E. system, the control
will display the message “S.A.F.E. System Disabled…Ready,
Insert XX To Start”. To find out the reason for the S.A.F.E.
system disabling, press and hold the red “Pause” and “Low”
keys. This will cause the control to display a diagnostic
message, as detailed in the following section.
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