American Dryer Corp. T20 - Manual (Page 22)

22 JLA Limited 113428-9
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Steam Requirements – High Pressure
Inlet ---------- 1/2” N.P.T. supply line connection
1 at top manifold
Return ------- 1/2” N.P.T. return line connection
1 at bottom manifold
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.
Operating Steam Pressure
T20 Stack
Maximum 150 psig * 1.0 MPa
Heat Input (Normal Load) 1.2 Bhp
Consumption (Approximate)
@ 125 psi (8.6 bar)
45 lb/hr 20.41 kg/hr
T30 Stack
Maximum 150 psig * 1.0 MPa
Heat Input (Normal Load) 1.75 Bhp
Consumption (Approximate)
@ 125 psi (8.6 bar)
63 lb/hr 28.58 kg/hr
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.