Speed Queen Drying Tumblers none - Manual (Page 40)

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Steam Requirements
Obtain specific steam service pipe sizes from 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
(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 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
globe valve. This will enable you to disconnect
the steam connections and service the tumbler
while your laundry facility is in operation.
●
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.
●
After flushing system, install vacuum breaker,
inverted bucket trap (with built-in strainer) and
check valve. 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 vacuum breaker and check valve in return
line near tumbler. 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 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 lines for safety
of operator and safety while servicing tumbler.
●
Keep tumbler in good working condition. Repair
or replace any worn or defective parts.
Machines require a (constant) 80 to 100 psig (pounds
per square inch gauge) (5.62 to 7.03 kg/sq. cm) steam
service for optimum operation.
WARNING
All system components must have a
125 psig (10 bar) working pressure.
Shut-off gate 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.
W427