American Dryer Corp M31SL manual Water Information

Steam Requirements – High Pressure

Operating Steam Pressure

Model	Maximum			Heat Input	Consumption (Approx.)		Inlet /
				(Normal Load)	@ 125 psi (8.6 bar)		Return
M31SL	150 psig*	1.0	MPa	1.75 Bhp	63 lb/hr	28.58 kg/hr	1/2” / 1/2”
M50SL	150 psig*	1.0	MPa	3.75 Bhp	127.5 lb/hr	57.83 kg/hr	3/4” / 3/4”
M75SL	150 psig*	1.0	MPa	4 Bhp	136 lb/hr	61.69 kg/hr	3/4” / 3/4”

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 100 lb (45.35 kg) of condensate per hour at 125 psi (8.62 bar) is needed for each 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.

Water Information _____________________

Before You Start

Check Local Codes and Permits

Call your local water company or the proper municipal authority for information regarding local codes.

Important

!It is your responsibility to have all plumbing connections made by a qualified professional to

ensure that the plumbing installation is adequate and conforms to local, state, and federal regulations or codes.

It is the installer’s or owner’s responsibility to see that the required water pressure, pipe size, or connections are provided. The manufacturer assumes no responsibility if the fire suppression system is not connected, installed, or maintained properly.

Installation

Water Supply

The fire suppression system must be supplied with a minimum water pipe size of 1/2-inch (12.7 mm) and be provided with 40 psi +/- 20 psi (2.75 bar +/- 1.37 bar) of pressure.

If the rear area of the dryer or the water supply is located in an area where it will be exposed to cold/freezing temperatures, provisions must be made to protect these water lines from freezing.

!	Warning
	If the water in the supply line or water solenoid
	valve freezes, the fire suppression system will be

inoperative!!

Water Connections

The water connection is made to the 3/4”-11.5 NH hose adaptor, which is shipped in the tumbler and must be installed to the 1/2” N.P.T. water connection, located at the upper rear of the dryer. A flexible supply line/coupling must be used in an effort to avoid damaging the electric water solenoid valve.

Note

!The 3/4”-11.5 NH is a standard hose coupling screw thread. It is not to be confused with 3/4”

N.P.T. The sealing of an NH connection is made with a washer opposed to the mating threads of an N.P.T. assembly. The 2 thread designs are not compatible.

It is recommended that a filter or strainer be installed in the water supply line.

Important

!Flexible supply line/coupling must be used. Solenoid valve failure due to hard plumbing

connections will void warranty.

The dryer is to be connected to the water mains using a new hose set and the old hose set should not be reused.

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