Steam Requirements; Piping Recommendations - ALLIANCE 120 Series Installation, Operation & Maintenance Manual

NOTE: Machines require a constant 5.3 to 6.9 bar
(80 to 100 psig) steam service for optimum
operation. The maximum allowable steam pressure
for use with 50 Hertz tumble dryers is 8.6 bar
(125 psig). In no case may the pressure exceed the
above value.
Obtain specific steam service pipe sizes from steam
system supplier or a qualified steam fitter.
 Refer to Figure 19 and Figure 20 for proper
steam pipe configurations.
 To prevent condensate draining from headers to
tumble dryer, piping should have a minimum
305 mm (12 inch) 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 tees.
 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
457 mm (18 inches) 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.
48

Steam Requirements

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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 1.2 m (4 feet)
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 lines for safety
of operator and safety while servicing tumble
dryer.
WARNING
All system components must have a
8.6 bar (125 psig) 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 tumbler steam coil connections.
W701
70458101 (EN)