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The ADC steam dryer uses a damper system instead of an electric steam valve to control the dryer's tem-
perature. On a call for heat the steam damper opens allowing room air to be drawn through the steam coil,
then into the basket (tumbler). Once the set-point temperature has been reached, the steam damper closes,
and room air now bypasses the steam coil and passes directly into the basket (tumbler).
The presence of condensate in the steam supply will cause water hammer and subsequent heat exchanger
failure. The steam supply connection into the main supply line must be made with a minimum 10-inch riser.
This will prevent any condensate from draining towards the dryer.
The steam supply piping to the dryer must include a 12-inch rise along with a drip trap and check valve. This
will prevent any condensate from entering the steam coil. Flexible hoses or couplings must be use. The dryer
vibrates slightly when it runs and this will cause steam coil connections to crack if they are hard piped to the
supply and return mains.
STEAM DAMPER SYSTEM
Shut-off valves for each dryer should be installed in the supply, return, and drip trap return lines. This will
allow the dryer to be isolated from the supply and return mains if the dryer needs maintenance work.
Install an inverted bucket steam trap and check valve at least 12-inches below the steam coil as near to the
coil as possible. A vacuum breaker should be installed in the piping. This will prevent the condensing steam
from causing a vacuum inside the coil, and possibly damaging the coil. The supply and return lines should be
insulated. This will save energy and provide for the safety of the operator and maintenance personnel.