American Dryer Corp ADH-75 Installation Instructions, Steam Damper Air System Connections, 51 bar

ADH-120

Inlet ------- 1” N.P.T. supply line connection (1 at top manifold).

Return --- 1/2” N.P.T. return line connection (1 at bottom manifold).

OPERATING STEAM PRESSURE

Maximum	125 psig*	861.84 kPa
Heat Input (Normal Load)	13 Bhp
Consumption (Approximate)	450 lb/hr	200.2 kg/hr
@ 125 psi (8.6 bar)

Shaded areas are stated in metric equivalents

*The minimum operating pressure for optimum results is 100 psig (689.47 kPa).

ADH-170

Inlet ------- 1-1/2” N.P.T. supply line connection (1 at top manifold).

Return --- 1-1/2” N.P.T. return line connection (1 at bottom manifold).

OPERATING STEAM PRESSURE

Maximum	125 psig*	861.84 kPa
Heat Input (Normal Load)	19 Bhp
Consumption (Approximate)	725 lb/hr	329.1 kg/hr
@ 125 psi (8.6 bar)

Shaded areas are stated in metric equivalents

*The minimum operating pressure for optimum results is 100 psig (689.47 kPa).

Installation Instructions

To ensure 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 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.

The presence of 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 with a minimum 10-inch (25.4 cm) riser. This will prevent any condensate from draining towards the dryer.

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.

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.

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.

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. A trap with a minimum capacity of 500 lb (226.79 kg) of condensate per hour at 125 psi (8.62 bar) is needed for each ADH-75 unit; 1,000 lb (453.59 kg) for each ADH-120 unit; and 1,500 lb (680.38 kg) for each ADH-170 unit. (Based on 2 times the steam consumption per hour.)

The supply line and the return line should be insulated. This will save energy and provide for the safety of the operator and maintenance personnel.

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 1 foot (0.31 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.

Important

!Flexible hoses/couplings must be used. Coil failure due to hard plumbing connections will void

the warranty.

Steam Damper Air System Connections

The dryer is manufactured with a pneumatic (piston) damper system and door interlock which requires an external supply of clean compressed air. The air connection is made to the steam damper solenoid valve which is located at the rear inner top area of the dryer just above the electric service relay box.

Air Requirements

Compressed	Air Pressure
Air Supply
Normal	80 psi	5.51 bar
Minimum Supply	70 psi	4.82 bar
Maximum Supply	90 psi	6.21 bar

Shaded areas are stated in metric equivalents

Air Connection

Air connection to system – 1/8” N.P.T.

Air Regulation

No air regulator or filtration is provided with the dryer. External regulation/filtration of 80 psi (5.51 bar) must be provided. It is suggested that a filter/regulator/gauge arrangement be added to the compressed air line just before the dryer connection. This is necessary to ensure that correct and clean air pressure is achieved.

Steam Damper System Operation

Adjustment (ADSH-120 Only)

When installing or adjusting the steam damper the following steps must be taken for proper operation of the system.

The linkage support assembly is placed on the center bar inside the plenum between the coils. The assembly must be positioned such that the locking collar is facing the rear of the dryer. When installing, examine the linkage assembly to be certain that collar has been welded on the proper side of the assembly. Refer to figure 1 on next page. The collar should not be locked into place on the center bar yet.

Facing the front of the coil assembly, the small linkage arm will be fastened to the left side of the linkage assembly and the large linkage arm will be positioned to the right. Each linkage is fastened with a clevis pin, a cotter pin, and a sufficient number of washers to allow the linkage to swivel without sloppiness.

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