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You can bypass the AC low pressure switch, on your Toyota Corolla, by removing the switch. You can remove the wiring to the switch and leave the switch and place.
Run a new ignition switch controlled "hot" wire directly to fan motor
Pressure switches are there for a reason read the schematic.
Older style tubs have a pressure switch usually mounted directly on the heater manifold, or attached to the plumbing. The pressure switch is connected to the spa pack/circuit board with 2 wires and shuts the heater off if there is not enough pressure in the heater tube/manifold to protect the heater from becoming damaged or even exploding or causing a fire in a dry heater condition. Newer spas that use Balboa controls have sensors built right into the heater so a pressure switch is no longer needed as the safety function of monitoring the heater for constant water pressure is now all performed within the heater on newer quality spas.
Do you mean that the heater will not shut down either by turning the thermostat down or turning the switch off. If turning the pump off will not shut down the heater it could possibly be one of the high limits or the gas valve has failed in the open position. If the heater will not fire when calling for heat then one or more components has failed. k
Use the manual provided with the heater. Each heater has somewhat different controls etc. If everything is already hooked up you may just have to turn a switch or two and turn up the thermostat.
it makes sure the heater is shut down BEFORE the pump does. It is very important if the heater runs without the pump running the water will boil in the lines and burn out the heater. I know this because my electrician didnt wire mine correctly and that's what happened to me. BYE BYE 2,500 heater
As the water begins to flow within the system, the components inside the heater compartment ( the pressure switch)senses that flow and if your heater is calling for heat it will fire. When that water ceases to flow those same sensors tell the heater to stop firing. Built in safety devices. Ken
Do you mean bypass the low pressure switch? If that's what you want, the answer is yes. Pull the pressure switch connector. Just jumper the two wires together and the compressor should come on provided that everything else is working right and the control switch is on.
Yes, for charging and diagnostic testing. Never for normal operation, it is a safety circuit.
Check all of the following............. 1. Pressure switch. 2. Pressure switch pigtail. 3. A/C heater controller.........
Somwhere under hood on low pressure side. To see if it is faulty just bypass switch by connecting wires leading into it to see if compressor turns on.