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d) Sprinkler Digital Temperature Controller
The sprinkler digital temperature controller is a programmable
microprocessor used to monitor temperatures via a Resistive
Temperature Device (RTD).
MAN3488
NOTE: Operating parameters are preset at the factory and should not
require any adjustment.
Master Relay -The coil in this relay must be
energized in order to close the
contacts needed to supply power
to the dryers control system.
Relay 1 - The coil in this relay energizes if the set-
point is reached closing Contact 1 and
Contact 2. Contact 1 latches Relay 1
on. Contact 2 closes, turning on the
sprinkler, the horn, and the reset button
light. Relay 1 will remain energized until
the reset button is pushed.
Relay 2 - The coil in this relay energizes if the set-
point is reached closing Contact 3, de-
energizing the Master Relay, and
shutting power off to the dryer. Relay 2
will remain energized until the reset
button is pushed.
NOTE: The Sprinkler System will remain on
until the tumbler (basket) temperature
falls below the set-point, and the reset
button is manually activated.
2. Sprinkler System Operation
NOTE: Refer to the ladder diagram provided with the dryer for specific relay logic.