When the Demand Cooling module detects discharge temperatures exceeding 292°F via the thermistor

Chatter is typically the result of low voltage from the transformer or a faulty thermostat

Corrosion-Resistant Construction: Features a durable bronze body and an alloy steel plated spring for longevity in hydronic service

This model utilizes a 1/8" NPT female air connection

0 µA or higher indicates a healthy flame signal

Greenheck SP-B90 Ceiling Exhaust Fan 318423-701 When the Demand Cooling moduleThe Greenheck SP B90 is a high performance ceiling exhaust fan engineered for continuous or intermittent ventilation in commercial and high end residential applications. Operating at 115V with a 1500 RPM motor, this unit delivers a nominal 90 CFM, making it an ideal bathroom exhaust fan for moisture control and air quality management. The low profile housing is constructed from heavy gauge galvanized steel, designed to fit into tight ceiling plenums