Jackson Hot Water Sanitizing Undercounter Dishmachines JPX-300NSU, Technical Manual

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SECTION 2: INSTALLATION & OPERATION INSTRUCTIONS

OPERATION INSTRUCTIONS

PREPARATION:

Before proceeding with the start-up of the unit, verify the following:

1. The strainer is in place and is clean.

2. That the wash and rinse arms are screwed securely into place and that their endcaps are tight. The wash and rinse arms should
rotate freely.

3. Verify all chemical levels for machine chemical feeder pumps are correct.

POWER UP:

To energize the unit, turn on the power at the service breaker. The voltage should have been previously verified as being

correct. If not, the voltage will have to be verified.

FILLING THE WASH TUB: 

For the initial fill, close the door and ensure that the MANUAL switch light is not on. Depress and hold  the

START CYCLE switch until the auto light comes on and releases. For the initial fill, run the machine through 3 cycles to fill  the tub
sump. The machine will run a partial cycle and fill to the bottom of the pan strainer. Open the door and verify that the water level is cor-
rect.  

NOTE: Ensure the orange/white wires at the heater contactor are connected properly. They have been purposely discon-
nected at the factory to avoid damage to the heater element when there is no water in the booster heater.

Hereafter, the water level is controlled by the timer that has been preset at the factory. Verify that there are no other leaks on the unit
before proceeding any further. The wash sump must be completely filled before operating the wash pump to prevent damage to the
component. Once the wash tub is filled, the unit is ready for operation.

The machine runs a complete cycle to drain and fill. If the machine is not allowed to drain, the water will build up inside the tub. After
the initial fill, the rinse water for the current cycle will become the wash water for the next cycle.

WARE PREPARATION:

Proper preparation of ware will help ensure good results and less re-washes. If not done properly, ware may

not come out clean and the efficiency of the dishmachine will be reduced. It is important to remember that a  dishmachine is not a
garbage disposal and that simply throwing unscraped dishes into the machine simply defeats the purpose altogether of washing the
ware. Scraps should be removed from ware prior to being loaded into a rack. Pre-rinsing and pre-soaking are good ideas, especially
for silverware and casserole dishes. Place cups and glasses upside down in racks so that they do not hold water during the cycle. The
dishmachine is meant not only to clean, but to sanitize as well, to destroy all of the bacteria that could be harmful to human beings. In
order to do this, ware must be properly prepared prior to being placed in the machine.

DAILY MACHINE PREPARATION:

Refer to the section entitled “PREPARATION” at the top of this page and follow the instructions

there. Afterwards, check that all of the chemical levels are correct and/or that there is plenty of detergent available for the expected
workload.

WARM-UP CYCLES:

For a typical daily start-up, it is recommended to run the machine through 3 cycles to ensure that all of the cold

water is out of the system and to verify that the unit is operating correctly. To cycle the machine, ensure that the power is on and that
the tub has filled to the correct level. 

Press the START CYCLE button and hold until the green auto light is on and releases, the unit will start, run through the cycle, and
shut off automatically. Repeat this two more times. The unit should now be ready to proceed with the washing of ware.

WASHING A RACK OF WARE:

To wash a rack, open the door completely and slide the rack into the unit. Close the door, press the

START CYCLE button and hold until the green auto light is on and releases, the unit will start. Once the cycle is completed, open the
door and remove the rack of clean ware. Replace with a rack of soiled ware and close the door. The process will then repeat itself.

OPERATIONAL INSPECTION:

Based upon usage, the pan strainer may become clogged with soil and debris as the workday pro-

gresses. Operators should regularly inspect the pan strainer to ensure it has not become clogged. If the strainer does, it will reduce
the washing capability of the machine. Instruct operators to clean out the pan strainer at regular intervals or as required by work load.

SHUTDOWN AND CLEANING:

At the end of the workday, close the door. Start a cycle. Wait approximately five seconds and then

push the POWER OFF switch. This will put the machine in shutdown mode which will let the machine drain completely prior to shut-
ting off. Once the wash tub is drained and power light is off, remove he pan strainer. Remove soil and debris from the strainer and set
to the side. Unscrew the wash and rinse arms from their manifolds. Remove the endcaps and flush the arms with water. Use a brush
to clean out the inside of the arms. If the nozzles appear to be clogged, use a toothpick to remove the obstruction. Wipe the inside of
the unit out, removing all soil and scraps. Reassemble the wash and rinse arms and replace them in the unit. The arms only need to
be hand tight, do not use tools to tighten them down. Reinstall the strainer and close the door. 

JPX-300NSU Technical Manual
7610-002-75-96 Rev. E (08/16/2005))