This manual provides detailed installation, troubleshooting and replacement information for the A. O. Smith AO-WH-SOFT-350 35,000 Grain Unit and AO-WH-SOFT-400T /40,000 Grain Unit whole house water softeners.
This manual covers the AO‑WH‑SOFT‑350 (35,000‑grain) and AO‑WH‑SOFT‑400T (40,000‑grain) whole‑house water softeners. It explains the components, recommended water‑supply conditions, and how to connect the unit safely.
The guide walks you through installation steps, controller programming, bypass valve operation, regeneration cycles, and common troubleshooting. It also includes specifications, warranty information, and a brief Spanish section.
| Grain capacity | 35,000 (AO‑WH‑SOFT‑350) / 40,000 (AO‑WH‑SOFT‑400T) |
|---|---|
| Water temperature range | 40 °F (4 °C) to 120 °F (49 °C) |
| Minimum flow rate | 2.0 gallons per minute (7.6 L/min) |
| Transformer voltage | 110 V 60 Hz or 220 V 50 Hz |