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Johnson Controls A19AAC-38 Utility Thermostat
When troubleshooting ignition failures
The unit requires a 120VAC line input and a 24VAC transformer output for the control circuit logic
it provides maximum mounting flexibility
maintaining the integrity of the furnace’s combustion sequence and preventing nuisance lockouts in cold weather conditions
Schneider Electric (Barber Colman) AM-321 Auxiliary Switch THPU32HP7Y Johnson Controls A19AAC-38 Utility ThermostatThe Schneider Electric AM 321 is a precision engineered 2 SPDT auxiliary switch designed to provide reliable position feedback and sequence control for HVAC actuators. Functioning as the AM 322 direct replacement, this unit is built for seamless integration with legacy Barber Colman and modern Schneider Electric actuator assemblies. The assembly features dual Single Pole Double Throw contacts with an adjustable differential, allowing field technicians
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