Alliance Laundry Systems 105 - Manual (Page 30)

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28 M414545
STEAM REQUIREMENTS (Steam Drying Tumblers)
The size of the steam service pipe is dependent upon
many variables (length, tees, high pressure system, low
pressure system, etc.). Specific pipe size information
should be obtained from the steam system supplier or a
qualified steam fitter.
1. Refer to Figure 9 for proper steam pipe
configurations.
2. To prevent condensate draining from headers to
tumbler, piping should have a minimum 12 inch rise
(30.5 cm) above respective header. Do not make
steam connection to header with a horizontal or
downward facing tee or elbow.
3. 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.
4. In both steam supply and steam return line, it is
recommended that each have a pipe union and globe
valve. This will enable you to disconnect the steam
connections and service the tumbler while your
facility is in operation.
5. Before connecting trap and check valve to tumbler,
open shut-off valve in steam supply line and allow
steam to flow through tumbler to flush out any dirt
and scale from tumbler. This will assure proper
operation of trap when connected.
6. After flushing system, install vacuum breaker, bucket
trap (with built-in strainer) and check valve. For
successful operation of tumbler, install trap 18 inches
(45.7 cm) 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 vacuum breaker and check valve
in return line near tumbler.
7. Install union and shut-off valve in return line and
make final pipe connections to return header.
PIPING RECOMMENDATIONS
1. Trap each steam coil individually. Always keep the
trap clean and in good working condition.
2. When tumbler is on the end of a line of equipment,
extend header at least 4 feet (1.2 m) beyond tumbler.
Install shutoff valve, union, check valve and bypass
trap at end of line. If gravity return to boiler, omit
trap.
3. Insulate steam supply and return line for safety of
operator and safety while servicing tumbler.
4. Keep tumbler in good working condition. Repair or
replace any worn or defective parts.
NOTE: Steam heated tumbler models are not
certified by the American Gas Association or the
Canadian Gas Association.
STEAM VALVE ELECTRICAL
CONNECTIONS
Refer to wiring diagram for steam valve electrical
connections in J-Box.
The flexible steam hoses connecting the
coil outlet connections and steam traps
must have a minimum of 172 psig (pounds
per square inch gauge) (12.04 kg/sq. cm)
working pressure. A shut-off valve must
be installed downstream from each steam
trap so the condensate return line can be
isolated in event a steam trap requires
maintenance.
W064
WARNING