American Dryer Corp. Super AD-30 - Manual (Page 32)

28
H. STEAM INFORMATION
It is your responsibility to have ALL plumbing connections made by a qualified professional to assure that the gas
plumbing installation is adequate and conforms with local and state regulations or codes.
Care must be exercised when leveling steam dryers into final position. After leveling the dryer, check the
downward pitch of the heat exchanger from front to rear with a level. Likewise, check the downward pitch of
the return condensate manifold toward its outlet part. Absence of these downward pitches will result in
probable water hammer and premature heat exchanger fracture and leakage.
The presence of condensate in the steam will cause water hammer and subsequent heat exchanger failure. The
steam supply connection must be taken from the top of a well-dripped steam main. If the supply run-out to the
dryer exceeds twenty (20) feet, it should be dripped just before the control valve with a proper trap and dirt
pocket.
IMPORTANT: Failure to comply with the requirements stipulated in this manual can result in
component failure which will VOID THE WARRANTY.
NOTE: The SUPER ADS-30 is manufactured with a pneumatic (piston) damper system which requires
an external supply of clean, dry, regulated air (80 PSI +/- 10 PSI).
1. Steam Coil PH Level
The normal PH level for copper type steam coils must be maintained between a value of 8.5 to 9.5. For steel
type steam coils the PH level must be maintained between a value of 9.5 to 10.5. These limits are set to limit
the acid attack of the steam coils.
IMPORTANT: Coil failure due to improper PH level will VOID THE WARRANTY.
2. Low-Pressure (up to 15 psi) or High-Pressure (16-125 psi) Damper Models
Adherence to the following instructions is necessary to eliminate coil features due to water hammer caused
by wet steam.
The ADC steam dryer uses a damper system instead of an electric steam valve to control the dryer's
temperature. 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 used. 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.
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.