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Rinse Regulating
07610-003-13-91 A
November 16, 2005
Dishmachine Maintenance Instructions
Thermostat
Replacement
(From EGO brand to Stemco)
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1. Some models, such as the Tempstrar pictured below, will require
that the thermostat bracket removed from the heater. Using a
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2. With the thermostat and thermostat bracket safely out of the
way, use a 7/16” combination wrench to loosen and then remove
3. Remove the wires from the old thermostat. It may be necessary
4. Remove the thermostat bracket mounting nuts with the 7/16”
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Many dishmachines comes with integral booster tanks to
ensure proper temperature of the final rinse. Jackson has predominantly used two manufacturers of thermostats, EGO and Stemco.
These instructions are for use with kit 06401-003-13-94, which is
to replace an EGO rinse regulating thermostat with a Stemco
brand.
Jackson offers all of the repair parts necessary for performing this task.
The instructions provided here are for maintenance personnel only. Unauthorized persons should not attempt any of the
steps contained in these instructions.
Warning: many of the instructions and steps within
this document require the use of tools. Only authorized per sonnel should ever perform any maintenance procedure on
the dishmachine!
PREPARATION
1. Power must be secured to the unit at the service breaker. Tag or lock out the service breaker to prevent accidental or
unauthorized energizing of the machine.
2. Ensure that incoming water to the machine is secured
either by use of a shut-off valve or disconnecting the incoming
water line.
3. The unit must be drained completely with the drain
stopper removed (if applicable).
4. Remove any and all access covers.
STEPS
ratchet, extension and 1/2” socket, remove the nuts and lock wash
er holding the bracket on.
Removing the thermostat bracket/heater nuts.
TOOLS REQUIRED
The following tools may be needed to perform this main -
tenance evolution:
1. 3/8” Nutdriver
2. 7/16” Combination Wrench
3. Needlenose Pliers
4. Phillipshead Screwdriver
5. Flathead Screwdriver
6. Ratchet with 1/2” Socket
TIME REQUIRED
It is estimated that it will take (1) person sixty minutes to
perform this task, not including all of the items indicated in the section entitled “PREPARATION”.
IMPORTANT NOTES
1. Read these instructions thoroughly before attempting
this maintenance task. Become familiar with the parts and what
actions need to be taken. This will save time in the long run!
2. These instructions are shown using a Tempstar model
dishmachine. However the steps provided should work for models
such as the JPX-300H as well.
Removing the thermostat bracket.
the imperial brass fitting holding the probe in.
to use the needlenose pliers to accomplish this.
nutdriver.
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Rinse RegulatingThermostat Replacement Instructions
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7. Insert the new thermostat/brass fitting combination into the well
Removing the imperial brass fitting. Attaching the jumper wires.
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Pulling the thermostat probe and fitting from the well.
Removing the wires from the thermostat.
5. Attach the jumper wires to the wires that you removed from the
old thermostat.
Sliding imperial fitting onto new thermostat.
6. Slide the new imperial brass fitting from your kit onto the new
thermostat.
Putting the new thermostat in the well.
and tighten down the brass fitting by hand.
Rinse RegulatingThermostat Replacement Instructions
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10. Use the phillipshead screwdriver to remove the attachment
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11. Attach the ring ends of the jumpers to the cups/screws removed
from the thermostat and attach them. The white jumper is to be
connected to COMMON. The orange and white jumper is to be
connected to NORMALLY CLOSED. Refer to your machine
12. Once both wires are attached, ensure that there is no excess
hanging out where it could become pinched by any cover or such.
13. Replace the heater nuts (if removed) and torque down as
required per the technical manual. Different models may have dif
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ferent torque specifications. Contact Jackson Technical Service if
Once the new thermostat is installed, it will be necesary to
ensure that it operates at the required and appropriate ranges. The
new thermostat has an adjustment that can be turned using a small
flathead screwdriver. Several cycles will need to be run on the unit
while observing the final rinse temperature. The thermostat needs
to cycle so that the final rinse water meets the indicated minimums
Tightening the brass fitting.
8. Use the 7/16” combination wrench to tighten down the brass fitting, while also positioning the new thermostat so that it does not
hang over the heater.
screws on the thermostat for the NORMALLY CLOSED and COM
MON points.
Fitting the jumper into the mounting cup.
What the installed thermostat should look like (Tempstar).
9. Note: regardless of the unit this is being done to, the concept is
to ensure that the thermostat cannot come into contact with the
heater leads or interfere with the placement of any covers.
schematic if you have any questions regarding this.
Securing jumpers to the thermostat.
there are any questions regarding this.
Removing the thermostat screws.
AFTER MAINTENANCE ACTIONS
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Rinse RegulatingThermostat Replacement Instructions
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on the machine data plate for every cycle.
Calibrating the new thermostat.
SPECIAL NOTES
Work performed on Jackson dishmachines by unautho rized or unqualified personnel may void the warranty. Before beginning this or any other maintenance evolution on a unit under warranty, you should contact a certified Jackson technician or Jackson
Technical Service. You can find a list of qualified service agencies
in the back of you unit’s installation manual.
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SPECIAL PARTS
Thermostat Replacement Kit: 6401-003-13-94*
*The kit contains a thermostat, imperial brass fitting,
jumper wires and instructions.
CONTACT INFORMATION
Jackson MSC Inc. provides technical support for all of the
dishmachines detailed in this manual. We strongly recommend that
you refer to this manual before making a call to our technical sup port staff. Please have this manual with you when you call so that
our staff can refer you, if necessary, to the proper page. Technical
support is available from 8:00 a.m. to 5:00 p.m. (EST), Monday
through Friday. Technical support is not available on holidays.
Contact technical support toll free at 1-888-800-5672. Please
remember that technical support is available for service personnel
only.
Rinse RegulatingThermostat Replacement Instructions
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