Lochinvar manuals are hosted at lochinvar.com under "Resource Library." Most products have separate Installation & Operation Manual and Service Manual documents — the service manual is typically restricted to contractors.
Where to download
- lochinvar.com → Resource Library → search by model number
- Lochinvar dealer/distributor — typically has printed copies and can email PDFs
- Lochinvar tech support: 1-615-889-8900 — manuals emailed within hours
- Installer: always retains a copy as part of warranty record
Documents by line
- NOBLE Combi (NKC) — Installation & Operation Manual; Service Manual; Quick Start Guide
- KNIGHT Fire-Tube (WHN) — separate manuals for combi (Knight Wall-Hung Combi) and heat-only (Knight Wall-Hung)
- SQUIRE Indirect (SIT / SSU) — installation and operation manual; covers all capacities
- AWHP Heat Pump — extensive: air space, condensate, mode operation, IRA registration. Mandatory reference
- EnergyRite (ERN) — commercial atmospheric install + venting + combustion air
- ARMOR (AWN) — commercial condensing install + condensate neutralization + venting
What\'s in the service manual
- Wiring diagrams
- Component test procedures (sensor resistance tables, gas valve voltage)
- Combustion analysis target values
- Fault code troubleshooting matrix
- Heat exchanger inspection and cleaning procedure
- Parts diagrams and part numbers
Bottom line
Always reference the model-specific manual — Lochinvar revises documents frequently as platforms update. The Installation Manual ships in the box with new units; the Service Manual is contractor-distributed and may require Lochinvar account access.