MAXIDRY MAXI200, Installation Manual, Page: 55 / 78

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I. STEAM DAMPER ACTUATOR SYSTEM
The system consists of a hinged damper plate, pneumatic piston, and a 24 volt solenoid valve with a needle valve to
control the speed of the piston actuation.
On a call for heat, a 24 volt signal is applied to the 3-way/2-position solenoid valve. This signal switches the valve so
that compressed air is sent to the piston. The piston rod extends, pushing the hinged steam damper plate to the opened
position. This allows room air to be drawn through the hot steam coil and then through the tumbler.
When the temperature set point has been reached, the 24 volt signal is removed from the solenoid valve, so that the
solenoid valve blocks the air supply to the piston, and the air in the piston is bled to the atmosphere. The spring in the
piston now retracts the piston rod, closing the steam damper. The steam damper plate now covers the steam coil and
allows room air to bypass the coil before entering the tumbler for a rapid cool down.
The steam damper plate should open and close slowly and smoothly. The speed can be modulated by adjusting the
needle valve knob. Turning the knob clockwise (CW) restricts the compressed airflow and slows down the steam
damper movement. Counterclockwise (CCW) adjustment speeds up the steam damper motion. Upon completion of
adjustment, tighten the needle valve’s locking nut.
J. WATER SUPPLY CONNECTION
FOR SENSOR ACTIVATED FIRE EXTINGUISHING (S.A.F.E.) SYSTEM
The dryer comes with S.A.F.E. system, connect a 40 +/- 20 psig (2.75 +/- 1.37 bar) 1/2” diameter water line to supply
the water valve of the S.A.F.E. system with the required water supply. The water connection is located on top of the
dryer on the left hand side. A tap has been supplied for the customer to connect a manual bypass to the S.A.F.E.
system. The same water connection applies to the manual bypass tap as specified above.