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a upgrade for standard S3 series coils
Common causes include restricted return airflow
The included gasket ensures a gas-tight seal at the collector box
It operates via 20-30Vac hardwire or battery power for millivolt systems
it is suitable for use with chilled or hot water containing up to 60% glycol
Marvair 50023 Heat Coil 324846-701 a upgrade for standard S3The Marvair 50023 Heat Coil is a 24V resistive heating component engineered for climate control in demanding environments such as telecom shelters, modular buildings, and educational facilities. Directly interchangeable with the HCR 12AQ1AA, this coil serves as a critical 24V auxiliary heat source, converting electrical energy into precise thermal output to maintain stable operating temperatures during low ambient conditions. Its DPDT switching relay
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