Alliance Laundry Systems 70269701R4 - Manual (Page 59)

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Steam Requirements
NOTE: The maximum allowable steam pressure
for use with 60 Hertz or 50 Hertz tumblers is
125 psig (8.6 bar). In no case may the pressure
exceed the above value.
Obtain specific steam service pipe sizes from the
steam system supplier or a qualified steam fitter.
● Refer to Figure 15 for proper steam pipe
configurations.
● To prevent condensate draining from headers to
tumbler, piping should have a minimum 12 inch
rise (305 mm) 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 tumbler. 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 tumbler
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 bucket trap with built-in strainer and
check valve. A vacuum breaker is optional. For
successful operation of tumbler, install trap 18
inches (457 mm) below coil and as near to the
tumbler 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
optional vacuum breaker and check valve in
return line near tumbler. Gravity return requires
entire return plumbing be below steam coil
outlet.
● 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.
Refer to Table 14 for Trap Sizing.
● When tumbler is on the end of a line of
equipment, extend header at least 4 feet
(1.2 meters) beyond tumbler. 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 tumbler.
● Keep tumbler in good working condition. Repair
or replace any worn or defective parts.
Table 14
Steam Trap Sizing
Tumbler
Model
Number of
Coil Rating
Steam Trap Size
(lb/hr Condensate)
25, 30
Pound
4 120
2 105
T30
4 105
2 95
35 Pound
4 140
2 120
All system components must have a
125 psig (10 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 tumbler steam coil connections.
W480
WARNING