Alliance Laundry Systems 250 C.F.M. User Manual

Page of 144
© Copyright, Alliance Laundry Systems LLC – DO NOT COPY or TRANSMIT
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