Jackson Tempstar TGP technical manual Overview of Operation

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OVERVIEW OF OPERATION (CONTINUED)

The operator may turn the power off at the ON/OFF switch for approximately 5 seconds, and then back on. This will also reset the ECB and the DSI. If flame is lost during normal burn, the DSI will attempt a reignition.

The ECB monitors the 12vdc signal from the DSI to the combination gas cutoff valve. The software in the ECB also reads the temperature at the middle of the heat exchanger with the T-mid thermistor. After the 5.5 second ignition time, the software will increase gas flow to the burner to minimum burn by increasing voltage to the modulating valve (MV). If the heat exchanger temperature is far away from the stabilization temperature, the software will increase gas flow to maximum burn.

Once the heat exchanger temperature nears the stabilization temperature the gas flow is slowly reduced until the minimum burn is attained. The software will keep the unit in minimum burn until the heat exchanger temperature exceeds stabilization tempera- ture when the gas will be shut off. Over many minutes, the software will turn the burner off and on repeatedly until all the water in the system reaches the stabilization temperature. At this point the software will only turn the burner on every 1-2 minutes to maintain the stabilization temperature. Now the unit is ready for operation.

As the dishwasher pulls water from the tank, the water is replaced with cooler water. The need to heat the new water is sensed by the software and the burner is turned on. The software will modulate the gas flow between minimum and maximum gas flow attempt- ing to recover the stabilization temperature and always keeping the tank temperature above the required temperature.

The stabilization temperature may be adjusted by means of a potentiometer located on the ECB. This is referred to as the T- set. (normally 4.25vdc)

The recirculating pump draws water from the rinse booster tank and circulates it through the wash tank coils where it will heat the water residing in the wash tank. The water then returns to the heat exchanger where it is reheated. This hot water then flows back to the rinse booster tank and repeats the cycle.

The thermostat,(in conjunction with the wash temp relay) is used during idle times to prevent wash tank temperature from exceeding 170° F (76.67°C), during normal operation the wash tank will self regulate between 150-165° F (65.56-73.89 °C). However, when idle, the temperature in the wash tank will slowly rise towards booster tank temperature until the temperature reaches 170° F (76.67°C). The wash tank thermostat will cycle the heat exchanger & recirculating pump off. When the wash tank temperature lowers, the heat exchanger and recirculating pump will energize. This will continue during all idle time. At any time that the unit is placed into operation, the wash

temp relay will energize and immediately power the heat exchanger and the recirculating pump, regardless of the thermostats position.

Excessive high temperatures in the system are avoided by the following: 1. high temperature limit control by input from T-mid thermistor, 2. energy cutoff temperature lockout (ECO) by means of a bi-metallic switch independent of the microprocessor which will break voltage to the combination gas cutoff valve if temperature in the system exceeds 210 F (98.89°C).

Excessive high pressures that potentially could be created in the system are vented directly to atmosphere by means of the rinse booster tank and rinse arms.

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Contents Technical Manual Table of Contents Specifications of the Tempstar TGP Page GAS Connection Operation Instructions Overview of Operation Overview of Operation Thermostat Adjustment Procedure AUTO-CALIBRATION Procedure Auto CalibrationTesting and Setting the Set Point Temperature Electronics Control Board ECBTesting the Thermistors To test the temperature at the T-in ThermistorControl Board LED Light Indications Green LED is offTroubleshooting Section Symptom Possible Cause ActionMeasure the continuity between terminals # Leaks do not USE Flame Low rinse temperature/low wash Low inlet water temperature Polarity will Damage the Circuit Boards DSIPiston. If less than 2.0 VDC, replace Control board Remove burner manifold and check correct Dimensions Letter DIMTable Dimensions Opening Letter DIM in DIM CMMain Assembly Shown Not ShownControl BOX Assembly Front View QTY Description MFG noControl BOX Assembly TOP View Hood Assembly Cantilever ARM Assembly TUB Assembly Back of TUB, & Drain Assembly Lower Assembly Right Side Incoming Plumbing Assembly Incoming Plumbing Parts Lists GAS Pack Assembly Upper WASH, & Rinse ARM Assembly Lower WASH, & Rinse ARM Assembly Steam Coil Assembly Steam Coil Assembly Parts Lists Rinse Tank Assembly Are not Included with This Assembly Not ShownElectronic Control Drawer Components RED Green LEDMetric Conversions Electrical Diagram