73992 High Limit Sensor

$30.09
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SKU
73992
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73992 High Limit Sensor
73992 High Limit Sensor

Each spa is equipped with a thermistor that is used as temperature sensor. The thermistor is a semiconductor that changes resistance with temperature changes (as the temperature goes up, the resistance goes down). A comparitor circuit then compares the voltage to the set point voltage. If the voltage differs the heating circuit is sent a signal to energize the heater system or teminate the system if voltage is equal to the set point. The set point is the spas default temperature (102°F) unless reset at the control panel's up or down temperature set buttons. The high limit is designed to disable the heating system and controls but keep the circulation pump running protecting against freeze damage in winter conditions.

NOTE: BYPASSING A THERMISTOR OR SHORTING THE TERMINALS WILL CAUSE THE SPA HEATER TO SHUT DOWN. NEVER ATTEMPT TO BYPASS OR ELIMINATE A THERMISTOR FROM THE CIRCUIT. TO CHECK THE THERMISTOR COMPARE THE RESISTANCE TO THE THERMISTOR CHART. THE WATER TEMPERATURE AND THERMISTOR SHOULD BE THE SAME.

Cold Weather Start-ups.

In below-freezing climates, technicians and delivery personnel occasionally run into symptoms of electronic high limit tripping when trying to start up a new spa (or a spa that has been stored empty). In the high limit tripped condition, only the circulation pump will operate (the heater, lamp, and jet pump will not operate).

High limit tripping at start up is most common in spas that have been stored outside or in unheated areas. This is because thermistors installed in empty spas are sensitive to very cold weather (in filled spas the warm water keeps the thermistor in its normal operating range). If the temperature of the high limit thermistor is near or below 45 degrees F, its resistance increases significantly. The very high resistance of the cold thermistor is outside of the normal operating range, so the high limit circuit shuts down the spa. A second set of thermistors kept in a warm Envioronment Can be switched out prior to powering up the spa. This will keep the system running until the original thermistor warm up.

HIGH LIMIT SENSOR Removal:
1. Disconnect power to the spa.
2. Remove the front access panel.
3. Open the control box lid.
4. Unplug the high limit sensor from the control box high limit terminal and remove it from the control box.
5. Trim any zip ties that hold the cords in place.
6. Remove the hi-limit sensor from the clip on the heater.
Installation:
Reverse the removal procedure to install the control sensor in the equipment compartment taking special care to apply insulation to the backside of the control sensor. Failure to replace the insulation around the high limit and heater will result in the possibilities of the spa shutting down during the winter months.
Note: After installation, switch the jet pump to high speed and check spa functions.

73992 High Limit Sensor is for the following models.       

 

Make Model Date Range
Hot Spot Relay 2010-Current
Hot Spot Relay 2013-Current
Hot Spot Rhythm 2010-Current
Hot Spot Tempo 2010-Current
Hot Spot SX 2011-Current
Hot Spot TX 2011-Current
Hot Spot Mallorca 2006-2009
Hot Spot Sorrento 2006-2009
Hot Spot La Palma 2008-2009
Hot Spot Tobago 2006-2009
Hot Spot Trinidad 2006-2009
Solana SX 2006-2010
Solana TX 2006-2010
Solana RX 2006-2009
Caldera Palatino 2010-Current
Caldera Marino 2010-Current
Caldera Vanto 2011-Current
Caldera Aventine 2006-2015
Caldera Cumberland 2006-2009
Caldera Olympia 2006-2009
Caldera Tarino 2013-Current
Caldera C 30 2006-2009
Caldera San Gabriel 2008-2009
Caldera Oasis 2006-2009
Caldera C 45 2006-2009
Specifications

 

Item Description Part #
1 Control Box 76840
2 Kit Control 76843
3 Fuse 25A/ SC Time Delay 71618
4 Control Thermistor 72493
5 Split Nut Union 2" 33761
6 Heater Assy 73994
7 Pressure Switch 73995
8 Hi-Limit Thermistor 73992
9 Tailpiece Heater 73905
10 O-Ring Tail Piece 34447

 

 

Item Description Part #
1 Control Box HS Hawk DOM 12 76840
2 Control Panel HS Hawk CG 12 76843
3 Fuse 25A/300V SC Time Delay 71618
4 Control Thermistor 72493
5 Pressure Switch 73995
6 Light Adaptor Eagle/Hawk 76860
7 Hi-Limit Thermistor 73992
8 Kit 12C Comm Hub 8 Port 74150
9 Power Jumper 2 Pin 39192

 

  

Item Description Part #
1 15 Amp/ 115v GFCI w/Cover 37870
2 Control Box Use 76840
3 Fuse 25A/300V SC Time Delay 71618
4 Control Thermistor 72493
5 Split Nut Union 2" 33761
6 Heater Assy 73994
7 Presssure Switch 73995
8 Hi-Limt Thermistor 73992
* Tail Piece Heater 70905
* O-Ring Tail Piece 34447

* Non-Illistrated Part

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