American Dryer Corp. ML-170 - Manual (Page 24)

24 American Dryer Corp. 113360 - 8
Operating Steam Pressure
Maximum 125 psig* 861.84 kPa
Heat Input (Normal Load) 19 Bhp
Consumption (Approximate) 725 lb/hr 328.85 kg/hr
2. Steam Requirements – High Pressure
Inlet ------ 1-1/2” N.P.T. supply line connection ---- qty. one (1) at top manifold.
Return --- 1-1/2” N.P.T. return line connection ----- qty. one (1) at bottom manifold.
Shaded areas are stated in metric equivalents
* The minimum operating pressure for optimum results is 100 psig (689.47 kPa).
3. Installation Instructions
To ensure an adequate supply of steam is provided, be sure that the steam lines and steam return lines are sized and
laid out as stipulated in this manual. Inadequate steam lines and steam return lines or improper steam plumbing will
result in poor performance and can cause component failure. Clean, dry steam must be provided to the dryer.
IMPORTANT: Steam coil failure due to water hammer by wet steam will VOID THE WARRANTY.
a. The presence of the condensate in the steam supply will cause water hammer and subsequent heat exchanger
(steam coil) failure. The steam supply connection into the main supply line must be made with a minimum
10-inch (25.4 cm) riser. This will prevent any condensate from draining towards the dryer.
b. The steam supply piping 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 line, return line, and drip trap return line. This
will allow the dryer to be isolated from the supply main and the return main if the dryer needs maintenance
work.
e. Install an inverted bucket steam trap and check valve at least 12-inches (30.48 cm) below the steam coil as
close to the coil as possible.
1) An inverted bucket steam trap with a capacity of 2,000 lb (907.18 kg) of condensate per hour @ 125 psi
(8.62 bar) is required for each dryer.
f. A 3/4-inch (19.05 mm) vacuum breaker should be installed. This will save energy and provide for the safety
of the operator and maintenance personnel.
g. Dryers with optional solenoid valve must be mounted with coil positioned directly above the valve body.
h. Water pockets in the supply line, caused by low points, will provide wet steam to the coil possibly causing steam
coil damage. ALL horizontal runs of steam supply piping should be pitched 1/4-inch (6.35 mm) for every one
foot (0.30 meters) back towards the steam supply header causing the condensate in the line to drain to the
header. Install a bypass trap in any low point to eliminate wet steam.