Alliance Laundry Systems 907003062 Manuale Utente

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70420801 (EN)
Steam Requirements
NOTE: Machines require a constant 80 to 100 psig 
(5.62 to 7.03 kg/sq. cm) steam service for optimum 
operation. The maximum allowable steam pressure 
for use with 60 Hertz or 50 Hertz tumble dryers is 
125 psig (8.6 bar). In no case may the pressure 
exceed the above value. Drying performance is 
significantly reduced at lower steam pressures.
Obtain specific steam service pipe sizes from steam 
system supplier or a qualified steam fitter.
 Refer to Figure 14 and Figure 15 for proper 
steam pipe configurations.
 To prevent condensate draining from headers to 
tumble dryer, piping should have a minimum 
12 inch (305 mm) rise above respective header. 
Do not make steam connection to header with a 
horizontal or downward facing tee or elbow.
 Whenever possible, horizontal runs of steam 
lines must drain, by gravity, to respective steam 
header. Water pockets or an improperly drained 
steam header will provide wet steam, causing 
improper operation of tumble dryer. If pockets or 
improper drainage cannot be eliminated, install a 
bypass trap to drain condensate from the low 
point in the steam header to the return.
 In both steam supply and steam return line, it is 
recommended that each have a pipe union and 
shut-off valve. This will enable you to disconnect 
the steam connections and service the tumble 
dryer while your laundry facility is in operation.
 Connect the steam solenoid valve to the related 
steam coil inlet connection with nipples, flex 
hoses, unions and tee.
 Strainers may require cleaning due to materials 
from hoses or pipes.
 Install vacuum breaker (optional), bucket trap 
with built-in strainer and check valve. For 
successful operation of tumble dryer, install trap 
18 inches (457 mm) below coil and as near to the 
tumble dryer as possible. Inspect trap carefully 
for inlet and outlet markings and install 
according to trap manufacturer's instructions. If 
steam is gravity returned to boiler, omit trap but 
install vacuum breaker and check valve in return 
line near tumble dryer.
 Gravity return requires entire return plumbing be 
below steam coil outlets.
 Install union and shut-off valve in return line and 
make final pipe connections to return header.
NOTE: To prevent water hammering, route return 
lines below outlets of steam coils.
Piping Recommendations
 Trap each steam coil individually. Always keep 
the trap clean and in good working condition.
 When tumble dryer is on the end of a line of 
equipment, extend header at least 4 feet 
(1.2 meters) beyond tumble dryer. Install shut-off 
valve, union, check valve and bypass trap at end 
of line. If gravity return to boiler, omit trap.
 Insulate steam supply and return line for safety of 
operator and safety while servicing tumble dryer.
 Keep tumble dryer in good working condition. 
Repair or replace any worn or defective parts.
WARNING
All system components must have a 
125 psig (8.6 bar) working pressure. 
Shut-off valves must be installed upstream 
of the steam solenoid valve and 
downstream of each steam trap so 
components can be isolated for 
maintenance or emergency purposes. 
All components (solenoid valve, traps) 
must be supported to minimize loads on 
the tumble dryer steam coil connections.
W480R2