American Dryer Corp. ADS-464 II - Manual (Page 31)

27
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.
e. A 3/4” vacuum breaker should be installed for each unit in the piping. This will prevent the condensing
steam from causing a vacuum inside the coil and possibly damaging the coil.
f. The supply line and return line should be insulated. This will save energy and provide for the safety of
the operator and the maintenance personnel.
g. 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 (0.08 cm)
for every one (1) foot (0.31 m) 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.
H. SHUT DOWN INSTRUCTIONS
In the case where the dryer is to be shut down (taken out of service) for a period of time, the following must be
performed;
1. Discontinue power to the dryer either at the external disconnect switch or the circuit breaker.
2. Disconnect the heat supply:
a. STEAM MODELS ... discontinue steam supply.
1) SHUT OFF external (location furnished) shut-off valve.
2) SHUT OFF internal steam valves in the supply lines and the return lines.