Another type of tumbler used at Navy activities is
the Cissell model 36-inch tumbler. This tumbler has a
drying capacity of 50 pounds (dry weight) of laundry
per hour. This tumbler can have heat for drying
supplied by a oil-fired burner attached to the unit or
supplied by a permanent plant source. It also has a
"cool down" feature for permanent press and other
The following instructions on the installation,
maintenance, and repair of tumblers apply to the
Huebsch Loadmaster model 42-inch tumbler. Always
consult the manufacturer's instructions for the brand
and model that you are installing.
When installing the tumbler, you should ensure the
Ensure the tumbler is level and properly secured
to the floor. In leveling, use shims of adequate
size to avoid weight concentration.
The dryer room must be well ventilated.
opening of 2 square feet to the atmosphere must
be supplied for each 1,700-cubic-feet per minute
(cfm) model and 4 square feet for each
3,000-cfm model. Allow adequate clearance on
all sides for servicing and efficient loading and
dispatching of dried materials.
On steam-heated laundry tumblers, a minimum
of 100 psi should be maintained for efficient
performance. Connect 3/4-inch steam supply
and return lines to the coils as marked on the coil
Laundry tumblers are factory-wired for
operation and require only a power supply
A fused disconnect should be installed. For
multiple-tumbler installations, each unit should
be equipped with a disconnect switch.
Ensure the fan rotation is correct.
For maximum efficiency of single- or
multiple-unit installation, air discharge must be
ducted individually to the atmosphere by the
shortest possible route. For runs less than 20 feet,
the duct size must equal the discharge spout or be
larger. For each additional 30 feet of duct run,
increase the entire duct diameter by one tenth for
round duct or the entire duct area by one fifth for
rectangle duct. Discharge to the atmosphere
must be constructed to get rid of too much back
pressure and to prevent the entrance of weather.
The end of the duct should be at least one
diameter away from any obstacle.
Check for correct cylinder, belt, and chain
adjustment before starting the unit, as described
later in this chapter. Turn the power on and start
the tumbler to check the cylinder and fan rotation
and the door switch adjustment.
Turn the steam on. Place a load of damp rags in
the cylinder and run until dry. Check the
cylinder adjustment under load and check for
vibration or unusual noise. Reversing models
must be checked for correct time delay betweeh
reversing cycles. Correct any adjustment before
placing the tumbler in service.
Maintenance and Repair
Two views of the tumbler are shown in figures
5-14 and 5-15. Try to keep the tumblers operating at
Some general maintenance and minor repair
procedures in the care and upkeep of tumblers are as
Loose wire connections can cause tumbler
failure and possible damage. Remove the
control box cover and check the controls.
Replace the contactor points when pitted or
Check and tighten all wire connections,
including thermal overload heating coils.
Check for secure mounting of controls to the
Ensure that electric motors are removed and
cleaned thoroughly. Frequent tripping of the
thermal overload circuit breakers may be caused
by low voltage, loose connections, reversed fan,
or high ambient temperature. Never increase
thermal overload heater size without complete
The door switch, thermostat, and other optional
electrical equipment require replacement upon
failure. After exchange, check the wiring
diagram before turning on the power. Check
with the power on. Adjust if necessary before
returning to service.
ADJUSTMENTS.In servicing the tumbler,
you may have to adjust the belt, chain, cylinder, and