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Duotone terrace — saffron brief on the left, garden-folded ledger on the right.
This motorized zone valve is high-temperature rated
1/4" Stem Diameter
Designed to manage burner sequencing and flame supervision
This model serves as the upgraded direct replacement for the McDonnell & Miller 157-R
preventing premature motor bearing failure
Carrier HH18HA435 Limit Switch 323080-701 This motorized zone valve isReplace failing thermal components with the Carrier HH18HA435 Limit Switch, a critical safety device engineered for precise temperature monitoring in residential and commercial furnaces. As a veteran grade 100 135F auto limit switch, this component is designed to interrupt the electrical circuit if the plenum temperature exceeds 135F, preventing heat exchanger damage and ensuring system integrity. Once the temperature drops to the 100F reset point,
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