it maintains consistent minimum and maximum firing rates

Simplified Maintenance: Facilitates easier alignment during commissioning without requiring complex mechanical modifications to the sight pipe

The extended length allows for flexible routing

optimized for larger air handler units requiring rapid heat recovery

an external fuse or breaker must be installed on the 24Vac secondary side

Hartland Controls 90291 Relay 321894-708 it maintains consistent minimum andWhen you need a dependable Hartland Controls 90291 for high duty cycle applications, this SPNO 120V relay stands as a professional grade solution for HVACR control circuits. Engineered as a general purpose relay, the 90291 features a single pole normally open configuration, making it the standard choice for switching fans, blowers, and combustion motors in residential and light commercial equipment. The 120VAC coil is designed for high efficiency