American Dryer Corp. AD-400 - Manual (Page 20)

6. Steam Piping (steam dryers only)
It is your responsibility to have all steam plumbing connections made by a qualified professional to
ensure that the installation is adequate and conforms with local and state regulations or codes.
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IMPORTANT: Failure to comply with the requirements stated in this manual can result in
component feilure which will void the warranty.
The steam iiJet connection of the steam coils is 2 inches MPT, and the condensate outlet connection is 2
inches MPT. The working steam pressure of the dryer is 125 psi at 23 boiler horsepower. Supplying a
lower steam pressure to ¿e dryer will result in slower drying times. The condensate outlet can be
reduced to 3/4-inch pipe.
This unit is not equipped with a steam valve. It utilizes an air damper bypass system with continuously
charged steam coils. With this system, the coils will always be energized and hot. Upon a call for heat,
the damper pivots about the steam coils, allowing the intake air to pass through the coils, thereby heating
the dryer. V^en the set point temperature in the dryer is reached, the damper will pivot back onto the
coils, directing cool room air directly into the basket, bypassing the coils. With this system, hot air and
cool air are provided instantaneously; consequently, there is a direct reduction in drying time, cool down
time, and energy usage. In addition, the life of the steam coils will be extended because they are not
constantly expanding and contracting.
I NOTE: No electrically operated steam valve is supplied, and none should be installed.
STEAM DAMPER SYSTEM
HANDS»
Adherence to the following instructions is necessary to eliminate coil failures due to water hammer
caused by wet steam.
1. The presence of condensate in the steam supply will cause water hammer and subsequent steam coil
failure. The steam supply connection from the main supply line must be made with a minimum
10-inch riser. This will prevent any condensate from draining towards the dryer.
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