26 American Dryer Corp. 113403-17
Steam Requirements – High Pressure
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.
Operating Steam Pressure
Model Maximum
Heat Input
(Normal Load)
Consumption (Approx.)
@ 125 psi (8.6 bar)
Inlet /
Return
SL31
150 psig*
1.0 MPa
1.75
Bhp 63 lb/hr
28.58 kg/hr
1/2” / 1/2”
SL50
150 psig*
1.0 MPa
3.75 Bhp 127.5 lb/hr
57.83 kg/hr
3/4” / 3/4”
SL75
150 psig*
1.0 MPa
4 Bhp 136 lb/hr
61.69 kg/hr
3/4” / 3/4”
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.
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