0 µA or higher indicates a healthy flame signal

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

Frequent cycling or "tripping" is typically indicative of restricted airflow

The integrated 24V solenoid provides reliable electronic actuation

making it an essential component for both air and water-source equipment

Greenheck SP-B90 Ceiling Exhaust Fan 318423-701 0 µA or higher indicatesThe 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