The Honeywell F52 series are return‑grille electronic air cleaners designed for wall or ceiling installation in central forced‑air heating, cooling, or ventilation systems. The F52C uses one electronic cell for up to 1000 CFM airflow, while the F52D uses two cells for up to 2000 CFM. Both units include a high‑voltage power supply, prefilter, sail switch, and indicator light.
This manual provides step‑by‑step instructions for unpacking, mounting the unit, adapting the sail switch for different mounting positions, wiring to a standard 120 V/60 Hz power source, attaching cell handles, and final checkout. Safety cautions, duct‑size recommendations, and parts lists are also included.
| Power consumption | 25 W (F52C) / 50 W (F52D) at 120 V |
|---|---|
| Current draw | 0.2 A (F52C) / 0.4 A (F52D) at 120 V |
| Dimensions (F52C) | 25‑15/16 × 12‑7/8 in (659 × 327 mm) |
Both counter‑balancing springs must be removed from the sail switch before installing the unit on a ceiling.
The ionizer section (side with fine wires) must face the front of the grille so that return air passes through the cell first.