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'NoPP' signifies that there is no pre-purge period
Match the part number with your original manufacturer’s data plate or technical parts list
providing essential over-temperature protection
allowing technicians to clear sediment or replace internals without dismantling the entire iron body assembly
How do I troubleshoot a pilot that will not stay lit
Carrier HH19ZA190 Limit Switch 321894-709 'NoPP' signifies that there isThe Carrier HH19ZA190 Limit Switch is a critical safety component engineered for precise thermal monitoring in residential and commercial HVAC furnace systems. This temperature actuated switch is designed to protect equipment and ductwork from overheating by interrupting the electrical circuit when the high limit threshold is reached. Specifically calibrated with a 190F Open and 150F Close thermal profile, it serves as a reliable flame rollout switch
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