Filter
Top Products
26 American Dryer Corp. 113386-14
3. Installation Instructions
To ensure that an adequate supply of steam is provided, be sure that the steam supply lines and steam
return lines are sized and laid out as stipulated in this manual. Inadequate steam supply and steam return
lines or improper steam plumbing will result in poor performance and can cause component failure. Clean,
dry, and regulated steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOID THE
WARRANTY.
a. The pressure of the condensate in the steam supply line will cause water hammer and subsequent heat
exchanger (steam coil) failure. The steam supply connection into the main supply line must be made within
a minimum 12-inch (30.48 cm) riser. This will prevent any condensate from draining towards the dryer.
b. The steam supply line to the dryer must include a 12-inch (30.48 cm) riser along with a drip trap and
check valve. This will prevent any condensate from entering the steam coil.
c. Flexible hoses or couplings must be used. The dryer vibrates slightly when it runs and this will cause
the steam coil connections to crack if they are hard piped to the supply and return mains.
d. Shutoff 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.
e. Install an inverted bucket steam trap and check valve for each unit at least 12-inches (30.48 cm) below
steam coil as close to the coil as possible. A trap with a capacity of 1,200 lb (544 kg) of condensate per
hour at 125 psi (8.62 bar, 862 kPa) is needed for each unit.
f. A 3/4-inch (19.05 mm) vacuum breaker should be installed for each unit in the piping. This will
prevent the condensing steam from causing a vacuum inside the coil and possibly damaging the coil.
g. Dryers with optional solenoid valve must be mounted with coil positioned directly above the valve body.
h. The supply and return lines should be insulated. This will save energy and provide safety for the
operator and maintenance personnel.
i. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly
causing coil damage.
ALL horizontal runs of steam supply piping should be pitched 1/4-inch (6.35
mm) for every 1 foot (0.31 meters) back towards the steam supply header causing any condensate in
the line to drain to the header. Install a bypass trap in any low point to eliminate wet steam.
!