Nelson Service & Support

Nelson Manufacture Automatic Horse, Livestock Waterers

Maintenance Videos

Nelson 700 Series (All Models 700 & 760) Horse & Livestock Waterers


Testing Heater – Nelson 700 Series Automatic Waterers

Installation must be made and maintained in strict accordance with national local electrical codes. Installation must be done by a qualified electrician. Improper electrical installation or maintenance may result in serious injury or death for personnel or animals or damage to structures.

Testing the heater can be done quickly. Simply connect the power supply directly to the heater bypassing the thermostat. The heater should get hot within a minute. With the power and water still off remove the lead weight, then remove the cotter pin from the tapered end of the brass pivot shaft and slide the shaft out. The pivot beam and cage may then be removed as a unit.

Next disconnect the thermostat from the hot wire of the power supply and the black wire of the heater. Leave connected the white wire of the heater to the neutral wire of the power supply and the green ground wire to the ground. Then connect the power supply directly to the black wire of the heater bypassing the thermostat. Now turn on the electric power to the waterer and observe the heater located below the cross beam. If the heater does not become hot within a minute, you’ll need to replace the heater.