TM 10--3510--221--10
0003 00--6
WASHING/DRYING SYSTEM THEORY
OF OPERATION -- Continued
0003 00
WATER TRANSFERRING
If a laundry cycle is interrupted and then restarted, it may be necessary to add water to the wash or rinse 1 tank in
order to complete the cycle. In this circumstance the control system will automatically transfer water from the rinse 2
tank to the wash tank or rinse 1. Water can also be transferred from the wash tank to the still, from the rinse 1 tank to
the wash tank, and from the rinse 2 tank to the rinse 1 tank utilizing a water cleaning cycle. When these functions are
selected the control system will open the appropriate ball valves and turn on the water pump (M101). The control
system will close the ball valves and turn off the water pump when the level indication at that wash and rinse 1 tanks
determine that they are at the proper level. In the transfer mode the control system will prevent further laundry
operations until the rinse 2 tank has been refilled through the normal water recycling process (WP 0004 00).
WATER DRAINING
When shutting LADS down at the completion of a mission, preparing the LADS for transport, or when maintenance
requires that the tanks be drained, the operator selects the draining sequence. When this function is selected the
control system will open ball valves (FV101 and FV109) and turn on the water pumps (M101). Water in the wash
tanks tanks will be pumped into the still and will gravity drain to the drain area. After the wash tanks are drained the
control system will close ball valves (FV101) and open ball valves (FV103) to drain the rinse 1 tanks. After the rinse 1
tanks are drained the control system will close ball valves (FV103) and open ball valves (FV105) to drain the rinse 2
tank. When the rinse 2 tank is drained the control system will turn off the water pumps and close ball valves (FV105).
WATER HEATING
After the water tanks have been filled, the operator selects the desired water temperature. The control system will
open ball valves (FV104, FV105, and FV114) and turn on the water pumps to obtain a representative sample
temperature of the water in the rinse 2 tank. After the sample has been obtained the control system will close the ball
valves and turn off the water pumps. If the actual water temperature is within 5 degrees F of the desired temperature
the water heating function will be bypassed. If the water is too hot the operator can change the desired temperature
or wait for the water to cool down. If the water is not hot enough the operator can change the desired temperature or
select the water heating sequence. When water heating is selected, the control system will open ball valves (FV105,
FV109, and FV114) and turn on the water pump (M101) to transfer water from the rinse 2 tank to the still. The amount
of water transferred will depend on the amount of heating required. When enough water has been transferred to
support distillation the control system will close ball valves (FV109 and FV114) turn off the water pumps. After the still
has begun to produce steam the control system will open ball valves (FV104 and FV115) and turn on the water
pumps. As the water coming out of the rinse 2 tank is pumped through the steam eductors it mixes with steam water
flowing from the still condenser. Using the input from temperature sensor (TE103) the control system will determine
when the water is at the proper temperature. The control system will close ball valves (FV104, FV105, and FV115)
and turn off the water pumps. Any water left in the still will return to the rinse 2 tank through the normal water recycle
process (WP 0004 00). After two laundry cycles have been completed, the water initially heated for the rinse 2 tank
will be in the wash tank. All subsequent laundry cycles will be completed with heated water.
