Hot Tub Part guide on:
How to rewire a LX Auto Heater
The following guide shows in detail what to change on an LX Auto Heater if you don't require the pressure switch cable. And how to bring the pressure switch inline with the main power line, which means the unit will only get power when circulation pump kicks in.
A little overview of the LX thermostatically controlled heaters.
The heater is one of the most useful parts sold for hot tubs and spas, it can be used for so many things from new build hot tubs, upgrading a wooden hot tub that only has a wood burner or even repairing an old hot tub that has a faulty heater. It fits 1.5" (ID) plumbing and runs at 10amps which means you can run it from a 13 amp plug. it has a dial on the side to adjust the temperature and contains a 2 or 3kw element and pressure switch.
Please note their is a arrow on the side of the unit that points in the direction that the water needs to go in.
Rewiring to remove the pressure switch cable.
The pressure switch cable has been added to heaters by the manufacturer to make it more versatile but we can not see what it is useful for, and therefore would suggest if it is not being used to rewire the unit to enable the pressure switch that is built in.
Currently the pressure switch is a separate circuit inside the unit and will need to be brought into the power line to make it active and useful as a safety device that switches the power of to the unit if their is not enough flow (water pressure). the switch on the pressure switch is 15 amps and designed to be run on a 240v circuit.
This guide was written by Jon Pennington @ Hot Tub Help Ltd for the Website www.hottubdiy.co.uk.