Lochinvar & A.O. Smith 100208463 Tester Assembly 321142-301 Use a multimeter set to

Use a multimeter set to the k-Ohm scale

Always verify if your specific installation requires additional steel guard rods for glass protection

For systems requiring auxiliary or emergency heat (multi-stage)

which may prevent the switch from closing

the inclusion of tamper-resistant bonnet screws and a dedicated test lever ensures the unit remains secure while allowing for necessary periodic system checks and maintenance

Lochinvar & A.O. Smith 100208463 Tester Assembly 321142-301 Use a multimeter set toThe Lochinvar & A. O. Smith 100208463 Tester Assembly is a critical diagnostic tool designed for service technicians to accurately evaluate variable speed fan motors in high efficiency Lochinvar heating systems and A. O. Smith air handling units. This OEM fan tester allows for rapid HVAC troubleshooting by isolating the blower motor from the control module, helping to determine if a performance issue stems from the motor's internal electronics or the